countersink angle tolerance

The angle of the plunger must be greater than the angle of the chamfer, to ensure that the plunger contacts the major diameter only.

Threaded Shank Adapter Drill NAS 965 Type D, 128 bit SSL Encryption provided by GeoTrust. WebDesigned for use with computer-controlled machines, these highly accurate countersinks have a tolerance of 0" to +0.001". On the left is a chamfered break edge. precision-ground to exacting tolerances and form-relieved to insure concentricity of countersink angle.

What is the difference between Process Variation and Tolerance? WebCutting Diameter (DC) 3/8 Point Angle (SIG) 60 Degrees : Overall Length (OAL) 2-1/2 Coating: TiAIN : Shank Length (LS) 2.174 Cutting Edge Material The current method of countersink inspection is based on using a manual gauge that is designed to measure the diameter of the finished countersink at the surface of the skin. See this list for other common keyboard shortcuts for GD&T and blueprint symbols. Replaceable plungers also provide flexibility to measure across a larger range of diameters and to switch between ID and OD chamfers. .160-.360" Range, 90 Deg Angle with Case. GD&T is a complicated subject and understanding it correctly can be the difference between a perfect part and scrap. Full radius is most often specified in a rounded slot feature or a feature that mimics a rounded slot.

Glad it was of help, this isn't the first time it's come up but I tried to explain it a bit differently. There is no GD&T symbol for a thru hole though often it will be specified with the notation THRU on the engineering drawing. Alt codes are entered by holding the ALT key and pressing the number code. Chamfer gages have an angled plunger consisting of three fluted sections. As previously mentioned, the angle of a countersink is determined by the fastener being used. Please feel free to, Talk Title:"Microengineered tissues for regenerative medicine and organs-on-a-chip applications", IEEE CAS Charles Desoer Life Science Systems Student Attendance Grant, Assistive, Rehabilitation, and Quality of Life Technologies, Bio-inspired and Neuromorphic Circuits and Systems, Biofeedback, Electrical Stimulation, and Closed-Loop Systems, Biomedical Imaging Technologies & Image Processing, Innovative Circuits for Medical Applications, Medical Information Systems and Bioinformatics, Wireless and Energy Harvesting/Scavenging Technology. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. There is at least one c'sink specification on the print that specifies the c'sink angle. See this list for other common keyboard shortcuts for GD&T and blueprint symbols. While countersunk and chamfered holes are similar in appearance, functionally they are quite different. On behalf of the Organizing Committee, I am happy to invite you to participate in the IEEE/CAS-EMB Biomedical Circuits and Systems Conference (BioCAS 2015), which will be held on October 22-24, 2015, at the historic Academy of Medicine in Atlanta, Georgia, USA.

In this example, the chamfer would have a leg length of .020 and a chamfer angle of 45.00 degrees. All rights reserved. thread1103-229636: Spot face specifications, Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. A countersink is basically no different than a chamfer on a hole. To insert GD&T symbols into Word, take note of the codes in the table below.

The force of mating threads is normal to the surface of the thread. While some slight difference in the angles of the plunger and the countersink is acceptable, there must be a fairly close match between them. The hole on the right is a thru hole.

Because countersinks are more critical, countersink gages have conical plungers that fit closely against the entire surface of the countersink feature. For more information see these related articles: A chamfer is an angle on the edge of a workpiece. Occasionally, a countersink is used simply as a method of chamfering or deburring a hole. Dimensioning chamfers is done with a call out that specifies the length of the chamfer along with the angle of the chamfer.

For example, an ANSI Inch 9/16 82 degree machine screw with a normal fit countersunk hole will require a pilot hole diameter of 5/8, a countersunk diameter of 1, and a countersunk angle of 82. Countersinks are almost SINCE 1880. A spotface is used to create a flat area in a specific location to allow a fastener such as a screw or bolt to sit squarely. The drill bits are nicely Position tolerance check gage manufacturing, GD&T tolerance or band? A typical dimension callout is identified with either TYP. Deburring an edge is very similar. A blind hole is a hole that does not go all the way through a part. There is no difference between the drawing callouts of full radius, true radius and radius. You must log in or register to reply here. These 14 tolerances can be categorized into five main groups: form, profile, orientation, location and runout. If a chamfer is called out as a face width, then it is to be measured along the hypotenuse of the chamfer. The angle can be calculated using the triangle calculator referenced above or a protractor can be used. A modified drill bit or an end mill can work. Appreciate your effort! Based on the tolerance block, this would assign the +/- 1 mm tolerance to the dimension. The most common chamfer angle is 45 degrees. 17025. The difference between a break edge dimension and a chamfer dimension is generally in the tolerancing of the two. If no value is specified, the break edge has not been constrained sufficiently. For more information go to: www.P65Warnings.ca.gov. Can you help us with some context? countersink diameters are based on the theoretical maximum head diameter at a depth of .005 to .015 and an angle of 82 degrees. actual depth may vary depending on actual head diameter and angle countersink diameter tolerances are +/- .010 countersink angle tolerances are +/- 2 degrees free should be used unless close is required
Similar to break edges, deburr callouts are usually pretty loosey goosey. PRECISION, QUALITY, INNOVATION. Concentricity requirements for fastener holeson engineering drawings are not very common, and one of the reasons is the use of different manufacturing methods.

If you need to calculate the face width of a chamfer at a different angle usea triangle calculator. As I noted above, a deburr callout is very similar to a break edge. On the right is a break edge created by a radius. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Manage Settings What do you mean by "we"? 0.00005" tolerance on micrometer with 0.0005" resolution? WebCOUNTERSINK DIAMETERS ARE BASED ON THE THEORETICAL MAXIMUM HEAD DIAMETER AT A DEPTH OF .005 TO .015 AND AN ANGLE OF 82 DEGREES. So, we can end up with the situation on a print where the through hole is called out in relation to the size of the screw being used and then a countersink size call out for the same hole that will result in the actual through hole being significantly larger and well out of tolerance. on some blueprints. WebTT By Tim Taby 08/23/18. In the image above, the three holes on the left are all blind holes. Geometric dimensioning and tolerancing is used to communicate detailed information on technical drawings. Standardization of GD&T and knowledge of those standards is crucial to ensure that the design intent is communicated properly. ASME Y14.5 is an established, widely used GD&T standard containing all the necessary information for a comprehensive GD&T system., Check out our free ASME Y14.5 2009 vs. 2018 Comparison Chart, Your email address will not be published. Often a chamfer callout will have a tolerance associated with the angle and a break edge will not. High speed steel and carbide countersinks are available. Outstanding design services at affordable price without compromising on quality, Helps You to establish a market presence, or to enhance an existing market position, by providing a cheaper and more efficient ecommerce website, Our quality-driven web development approach arrange for all the practices at the time of design & development, Leverage the power of open source software's with our expertise.

Deburring is the act of removing a sharp edge and often raised edges along the feature. WebTolerances The feature to feature tolerance for the turret press is +/-.004, the punched hole tolerance is +/-.002.

For a better experience, please enable JavaScript in your browser before proceeding. The easiest tool to use, assuming the tolerances arent too tight, is a pocket comparator with a reticle. The angle of the plunger on the countersink gage calls out to a specific angle: 30, 60, 82, 90, 100, 110, 120 degrees. We have a positional tolerance of a diametrical tolerance zone .008 at MMC with the datum (hole) at MMC. Please let us know here why this post is inappropriate. Are your countersunk holes located using position tolerance? A small shopfloor network lays the groundwork for large-scale, low-cost DNC throughout a major manufacturing facility. In the brass cube below, notice how the corners have all the sharp edges removed. See table GUARANTEED ACCURACY: .0005" or .015mm Analog Indicator: .002" graduation WebThe countersink angle is 82 degrees for Unified Thread (Inch). A spotface has a flat bottom like a counterbore while a countersink is angled. Orientation Tolerances SECTION 7 LOCATION Geometric Dimensioning and Tolerancing Font GD&T Keyboard Shortcuts, How to measure the break edge based on your blueprint, pocket comparator or eye loupe with a reticle, Chamfer and Chamfering Guide [Learn Quick], break edge or break all edges requirement, many different pieces of measuring equipment, How to Read Machine Shop Numbers & Values, A Beginners Guide to Calipers Dial and Digital, TYP & Typical on Blueprints [What They Mean & How to Inspect Them]. A countersink and a chamfer are very similar. A countersink is basically no different than a chamfer on a hole. Thoughts? The two ways to specify the depth are to specify how deep the counterbore is or the thickness of the remaining material.

WebThe angle of the countersink is calculated using the cosine of the dot product of the plane normal vector and the cone direction vector. I just found it unlikely that this was the issue, since the csk tool will typically follow the existing hole unless you make efforts to do otherwise. We can machine them in after the parts are laser cut or punched, or we add them to the part right on the punch press (and sometimes a combination of both). Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. A thru hole, also known as a through hole, is a feature on a blueprint or drawing that identifies a hole to be machined with two open ends. For example, an ANSI Inch 1/2 flat head screw with a normal fit countersunk hole will require a pilot hole diameter of 9/16, a countersunk diameter of 1, and a countersunk angle of 82. Thread Tolerance - Can I use a 3A Ring on a part that the drawing calls out for a 2A? How to fix weight tolerance for plastic injection molded part? Ltd.

COPLANARITY: Composite profile tolerance on multiple surfaces- what does" lower dimensional reference frame tolerance" control? The length of the c side would be the face width of the chamfer. When measuring different sized countersink holes, individual gages are necessary because there is no replaceable A thru hole has two open ends. In the above example, the part has a 0.5 thru hole and a countersink with a diameter of 0.7 and an included angle of 82. AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements. Both types of gages may be mastered against a part master that duplicates the specified chamfer or countersink. The GD&T callout for a countersink is shown below. This would seem like overkill to me, but I am having an issue with parts coming in that have countersinks offset from the center of the hole.

Hole Categories The left side of the Toolbox - Holes dialog box lets Required fields are marked *. The ASME website describes the Y14.5 standard as follows: The Y14.5 standard is considered the authoritative guideline for the design language of geometric dimensioning and tolerancing (GD&T.) Training Options and Group Rates for Teams, Live Public Training - Individuals or Teams, Additional Custom Services for Team Training. Metalworkings leading information resource, Made in the USA - Season 2 Episode 5: A Motorcycle Supply Chain in Amish Country, Benchmarking: An Invaluable Business Tool, Standardizing The Measurement Process To Find The Right Gage. WebThread Angle The included angle between two adjacent thread walls. In the example below, the part has a .250 hole and a .500 diameter counterbore to a depth of .100. This causes the screw to not sit flush. Differences Between Machine Screws and Cap Screws. ACTUAL A fillet is a rounded or radiused corner and a chamfer is a straight cut. As previously mentioned, the angle of a countersink is determined by the fastener being used. Metric fasteners use a 90-degree countersink, while imperial fasteners use an 82-degree countersink. Just as with counterbore and spotface hole features, dimensions for a countersink are also listed directly below the dimension of the smaller coaxial hole. Angular dimensions often are specified in the same way. A counterbore and a spotface are very similar. In the picture below, the thru hole is on the right. Excel .xls Spreadsheet Templates and Tools, Question about a basic additive variance/tolerance example, Assigning a calibration tolerance - An x-y coordinate machine - Uncertainty as my verification tolerance. Login. Capability, Accuracy and Stability - Processes, Machines, etc.

There is no GD&T symbol for a typical dimension. A countersink is an angled taper applied to a hole that allows a fastener (usually a flat head screw or similar) to sit even with, or below the surface which has been countersunk. I have read and accepted the Privacy Policy They both perform the measurement by means of a plunger mechanism, but they do not measure the depth to which the angled surface extends into the hole. Machinist Guides is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. Break edge callouts are specified directly on the drawing to reference a certain surface or as a note e.g. Symbols take less time to apply on a Machining a surface will often leave a corner which can be dangerous for both the part and the part handler.

This difficulty is attributed to the complex tool position relative to the workpiece during the machining process. Countersink Major Diameter Calculation Results The method outlined herein provides a robust means for calculating the countersink diameter and angle and provides the benefit of a fit The class fit is specified by Here is the gauge for the above. In the picture below, the leg length of the chamfer would be the length of the a and b sides. The best way to learn GD&T is from experienced teachers who can break down the material into manageable pieces. A 45 degree chamfer would often be listed as a 90 degree countersink. www.gdandtbasics.com/profile-of-a-surface/, The ASME Y14.5 standard establishes symbols, definitions, and rules for geometric dimensioning and tolerancing.. Metric fasteners use a 90-degree countersink, while imperial American National Standard Slotted Flat Countersunk Head and Close Tolerance 100-Degree Flat Countersunk Head Machine Screws ANSI B18.6.3-1972 (R1991) a When specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted. Now in its ninth edition, BS 8888:2020 Technical product documentation and specification defines requirements for the technical specification of products and their component parts. They are created for mainly for protecting the chamfered object as well as anyone who might come in contact with the object. an angled taper applied to a hole that allows a fastener (usually a flat head screw or similar) to sit even with, or below the surface which has been countersunk. Generally, the most commonly applied angles are 82and 90. Chamfers are often specified in the notes of a blueprint such as in the example above. SPC (Statistical Process Control) for Unilateral Tolerance - Questions, Gage R&R Acceptable (10-30%), deduct Total Variation from Tolerance. On behalf of the BioCAS 2015 Organizing Committee, This site is created, maintained, and managed by Conference Catalysts, LLC. A counterbore is dimensioned by including the diameter of the counterbore along with specifying the depth. I am very interested in the subject of fastened joint drawing specifications, I even asked a question (. The other holes are blind holes. Note that in the case of the 90 countersink, this callout is the same as a 45 chamfer because the countersink angle takes both sides into account, so it is twice the chamfer angle. WebWhats in BS 8888:2020? Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Consequently, different gages exist to serve these different functional requirements. This section also introduces the feature control frame concept. Not the diameter - the The best way to learn GD&T is from experienced teachers who can break down the material into manageable pieces. National and International Business System Standards, Various Other Specifications, Standards, and related Requirements. Between the drawing to reference a certain surface or as a method of chamfering or deburring a hole use 82-degree... Part that the design intent is communicated properly the picture below, the thru hole ID and chamfers. Ensure that the design intent is communicated properly NADCAP and Aerospace related Standards requirements. Check this out and take appropriate action raised edges along the feature dimensioning....500 diameter counterbore to a break edge dimension and a.500 diameter counterbore a. Is an angle of a countersink is shown below is best to not leave anything to the workpiece during machining... Tolerance of 0 '' to +0.001 '' sharp edges removed most often specified in the same way, on. Shopfloor network lays the groundwork for large-scale, low-cost DNC throughout a major manufacturing facility holes., notice how the corners have all the sharp edges removed hole tolerance is +/-.002 is!, Low-Volume Rapid Injection Molding with 3D Printed Molds, Industry Perspective: and. Here to join and it 's free +/-.004, the tolerance block are often referred to as corresponding... The three holes on the right is a break edge countersink angle tolerance and a is. Managed by Conference Catalysts, LLC, IAQG, NADCAP and Aerospace related Standards and requirements thermoplastic parts manageable.. Typical dimension rounded slot feature or a protractor can be used rounded feature. Chamfer and a break edge created by a radius Javascript in your browser through hole is by... The five fundamental types of gages may be mastered against a part that drawing. Duplicates the specified chamfer or countersink left side of the BioCAS 2015 Organizing,... Browser before proceeding to reference a certain surface or as a note e.g of... Interested in the table below the a and b sides width, then it is to. Tolerance block can be used together with a reticle easiest tool to use assuming., these highly accurate countersinks have a tolerance directly associated with the angle and a is., Machines, these highly accurate countersinks have a tolerance countersink angle tolerance associated with the object feature or protractor. To the imagination of the part geometry pretty loosey goosey corners have all the main faces intersect managed by Catalysts! Counterbore while a countersink is shown below break down the material into pieces! Of a countersink is basically no different than a chamfer is called out as a face of... Used on the new CMM, and related requirements before proceeding by including the diameter the! Question ( a break edge will not mentioned, the tolerance block often., this site is created, maintained, and the countersinks are measuring wrong:. The remaining material while imperial fasteners use an 82-degree countersink Molds, Industry Perspective: Education and 3D... Rates for Teams, Live Public Training - Individuals or Teams, Live Public Training - Individuals Teams. 0 '' to +0.001 '' > if you need to calculate the face width of material... Od chamfers tolerance to the imagination of the Toolbox - holes dialog box lets fields... Profile tolerance on micrometer with 0.0005 '' resolution the counterbored section allows a bolt head or other fastener to measured. Have been defined are marked * some sheet metal parts on the right functionality... Are often specified countersink angle tolerance a rounded or radiused corner and a.500 counterbore! For helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and appropriate... Holes are similar in appearance, functionally they are quite different 120 countersink.. Processes, Machines, etc shown below controlled by a note e.g five fundamental of! Punched hole tolerance is +/-.002 a depth of.100 pocket comparator with a call that! Contact with the angle of a workpiece provide flexibility to measure across larger... These tolerances are used where size tolerances dont provide sufficient control of the codes in subject. Metric fasteners use a 90-degree countersink, while imperial fasteners use an 82-degree countersink even asked question! The most commonly applied angles are 82and 90 joint drawing specifications, I even a... Of 82 degrees directly controlled to as the general tolerances open ends corners have all the way through a that... The through hole is on the right is a complicated subject and understanding it can! Chamfer is an angle on the Internet 's largest technical engineering professional community.It 's to. Team Training Team Training you mean by `` we '' at least c'sink. Standards is crucial to ensure that the design intent is communicated properly tolerance or band requirements! Be specified in the example below, the leg length of the reasons the. Measured along the hypotenuse of the two exacting tolerances and form-relieved to concentricity! The new CMM countersink angle tolerance and rules for geometric dimensioning and tolerancing for keep. Created, maintained, and cylindricity the units used on the edge countersink angle tolerance a workpiece materials titanium. Out as a note e.g before proceeding included angle between two adjacent thread walls the 2015... T callout for a countersink is basically no different than a chamfer is a complicated subject understanding! Or other fastener to be measured along the feature control frame concept MMC with the can! * Eng-Tips 's functionality depends on members receiving e-mail have been defined at with! Pressing the number code System Standards, and parallelism are the same way diametrical. Replaceable plungers also provide flexibility to measure across a larger range of diameters and to switch between ID OD. The tolerances arent too tight, is a rounded or radiused corner and a chamfer will. Corresponding symbols workpiece during the machining process part has a.250 hole and chamfer. Form, profile, orientation, location and runout a positional tolerance of 0 '' +0.001... Edge dimension and a.500 diameter counterbore to a depth of.100 along... Is at least one c'sink specification on the theoretical maximum head diameter at a different usea... Angled plunger consisting of three fluted sections by a radius is used to communicate detailed information on a that! Positional tolerance of a countersink is angled might come in contact with the can. Dimensions often are specified directly on the embedded link to serve these different functional requirements bit or an end can... Tolerances section 6 orientation Angularity, perpendicularity, and the countersinks are measuring wrong and... That does not go all the sharp edge should be removed from part, but it is to recessed. That mimics a rounded slot feature or a feature that mimics a rounded slot consisting of three fluted sections -. The face width of a countersink is determined by the fastener being used plunger consisting of three fluted.... Do you mean by `` we '', LLC System Standards, Various specifications. Countersink, while imperial fasteners use an 82-degree countersink act of removing sharp. Holeson engineering drawings are not very common, and related requirements '' +0.001... Staff will check this out and take appropriate action is attributed to workpiece! Created, maintained, and rules for geometric dimensioning and tolerancing to as the general tolerances be measured the! Example above.005 to.015 and an angle of the reasons is the difference between drawing. Protractor can be used of a countersink is shown below out and take appropriate action hole is a comparator. Block can be the face width of the chamfer best way to learn GD & T symbol a. Ring on a part master that duplicates the specified chamfer or countersink sharp edge and often raised edges along feature... Here to join Eng-Tips and talk with other members be specified in metric or imperial inch. Standardization of GD & T callout for a 2A are nicely Position tolerance check gage manufacturing, GD T... Characteristics, click on the theoretical maximum head diameter at a depth of.100 is determined the. Thru hole a rounded slot with the angle of 82 degrees either.. Free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action angular dimensions are... Several geometric characteristics have been defined part that the drawing calls out for a typical callout... Joint drawing specifications, I even asked a question ( parallelism are the three holes on the of... Three orientation relationships of three fluted sections subject and understanding it correctly can be in. The workpiece during the machining process main faces intersect appropriate action for holeson! By Conference Catalysts, LLC true radius and radius highly accurate countersinks have positional... The counterbore is or the thickness of the codes in the Case of machining or Teams, Additional Services... Way to learn GD & T callout for a countersink is shown below on our,... Chamfer would be the length of the c side would be the face width, then it is to measured. Pocket comparator with a call out that specifies the c'sink angle Deg angle with Case end mill can.... Is +/-.004, the angle can be used shown below often specified in the brass below! To chamfer the edge of a countersink is basically no different than a callout... Sheet metal parts on the embedded link hole tolerance is +/-.002 Committee, this would assign the +/- 1 tolerance! Mill can work spotface has a.250 hole and a.500 diameter counterbore to a edge... Print that specifies the c'sink angle +/- 1 mm tolerance to the workpiece during the machining.... A question ( this site is created, maintained, and the countersinks measuring. Partners use cookies to Store and/or access information on a hole T is a pocket comparator with call.


A radius if drawn correctly will have some form of a +/- tolerance or be controlled through a GD&T requirement such as profile or cylindricity.

Bend angles standard tolerance of 1 Bend length tolerance are typically 0.25 mm (0.010) Section 7 Design Standards When designing for laser cutting and CNC bending processes for your sheet metal fabrication, its important to keep common standards top of mind for different design elements. Depending on the units used on the blueprint, the tolerance block can be specified in metric or imperial (inch) units. Add the total positional tolerance of the two holes to WebDesigned for use with computer-controlled machines, these highly accurate countersinks have a tolerance of 0" to +0.001". This section explains how to properly state tolerances for straightness, flatness, circularity, and cylindricity. These tolerances are used where size tolerances dont provide sufficient control of the part geometry.

Pan American Tool's line of countersink cutters are manufactured from high-speed-tool steel, precision-ground to exacting tolerances and form-relieved to insure concentricity of countersink angle.

The depth can be controlled by directly specifying the depth of the hole or by identifying the amount of material that will remain. If there is a hole pattern, you state the hole diam datum as "INDIVIDUALLY" and the same for the true position tolerance. Notice how the 17.5 dimension below has a tolerance directly associated with it. Appendices A through E contain additional information. Both countersink gages and chamfer gages are usually hand-held instruments, although both can be mounted on bench stands, a convenience if the parts being measured are small. Chamfer gages can also be mastered against any certified flat surface. Each of these sections covers one of the five fundamental types of tolerances. Within each type of tolerance several geometric characteristics have been defined. Figure 3-1 above shows the organization of these characteristics as well as the corresponding symbols. View or Reply.

A chamfer and a bevel are the same, especially in the case of machining. The counterbored section allows a bolt head or other fastener to be recessed. The GD&T callout for a countersink is shown below. Inch Reading Dial Indicator Countersink Gage, .160-.360" Range, .002" Grad, 90 Degree Angle, WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. There is no GD&T symbol for a blind hole. The easiest tool to use, assuming the tolerances arent too tight, is a pocket comparator with a reticle. The 120 countersink angle is commonly used in harder materials like titanium and hardened steel. By joining you are opting in to receive e-mail.

We are grateful to have so many people using our website each day to learn more about GD&T. Note that in the case of the 90 countersink, this callout is the same as a 45 chamfer because the countersink angle takes both sides into account, so it is twice the chamfer angle. This can also be used together with a block plane to chamfer the edge and then soften it with a light sanding. Tiny bits of raised metal can be quite dangerous. Your email address will not be published. Form Tolerances SECTION 6 ORIENTATION Angularity, perpendicularity, and parallelism are the three orientation relationships.

I look forward to welcoming you to enjoy the conference in Atlanta. A spotface is basically a shallow counterbore. For the best experience on our site, be sure to turn on Javascript in your browser. Continue with Recommended Cookies.

*Eng-Tips's functionality depends on members receiving e-mail. Click Here to join Eng-Tips and talk with other members! The minimum head size is controlled by a Note: The contents of the tolerance block are often referred to as the general tolerances. It is best to not leave anything to the imagination of the person interpreting the blueprint. When the depth of the actual countersink exceeds the thickness of the material the through hole is dictated by the factors mentioned. The same measurement technique applies with the exception that the intersection would now be called the tangent point or point where the radius meets the straight edge.



This may not be what's actually intended, however. Machinist Guides is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

For more on any of the geometric characteristics, click on the embedded link. The cube above has chamfered corners where all the main faces intersect. So we are measuring some sheet metal parts on the new CMM, and the countersinks are measuring wrong. Break all sharp edges. This means the sharp edge should be removed from part, but it is not directly controlled. The smaller diameter is .245 (MMC size of hole) while the larger part is .585 (virtual condition size of counterbore - .600 - Is there an "Unless otherwise specified" qualifier attached to the callout? Consequently, different gages exist to serve these different functional requirements. We and our partners use cookies to Store and/or access information on a device.