Stub acme thread relief

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Close this window and log in. Are you an Engineering professional? Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Hello, everyone Where can I find litterature on relief cut?

Does anyone know? In relation to what? Shafting, threads, moulds or moulded products, engraving, sheet metal, flood control, origami,??? Cheers, CorBlimeyLimey In this case we are talking notch relief groove related to tensile or compression in steel components, axisymmetric components, where the force acts in an axial direction. Regarding cracking relief? You may want to look at Peterson's Stress Consentration Factors. I don't have that book, but does it tell you how to get rid of the stress concentrations?

I know where the problem lies, but not how to optimize my design For example, 1. I like to break these reliefs with a 45 degree angle in all cases. This saves me time in recomputing the proper threading geometry. Red Flag This Post Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

This includes challenging trends on contractors and distributors like new refrigerants, growing automation, complex sensors and monitoring, green initiatives and a technician shortage.

stub acme thread relief

We look at these trends and outline actionable insights on how it all can be turned into a competitive advantage and business opportunity. Download Now.For a fit having minimal backlash, the tolerances and allowances for classes 3G or 4G General Purpose Acme Threads may be used. Stub Acme Threads have a preferred series of diameters and pitches which happens to be the same as General Purpose Acme Threads. The proper method of designation for Standard Stub Acme threads is illustrated in the following examples: 0.

Recognizing that the Standard Stub Acme does not always provide an accepted thread for all applications basic data for two other frequently used forms have been tabulated.

stub acme thread relief

For Modified Form 1, M1 - the pitch and minor diameters will be smaller than similar values for the standard form. For Modified 2, M2 - the pitch and minor diameters will be larger than values for the standard form. Disclaimer: This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. To purchase a copy visit an Authorized Reseller. Gage Crib Worldwide, Inc.

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Live Chat Powered by jivochat. Top Gage Crib Worldwide, Inc.Threads up to a shoulder or in a blind hole present the same problem. How close to the shoulder or bottom can a full thread be produced? This depends on the size and pitch of the thread and the material threaded. The number varies with the pitch of the thread and by the machinability of the material. When a mating part must be seated against a shoulder or hole bottom, a thread relief recess or undercut should be shown on the part.

This provides clearance for the threading tools. This is shown in Figures 3 and 4. When drawing a recess or undercut, it is necessary that its diameter be minimum.

Exact angles can not be produced due to the displacement of the metal forming the thread. Return to Table of Contents. All rights reserved. Association web design and development by Matrix Group International, Inc.

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The latest industry news—straight to your inbox. Sign up for our eNewsletter now to stay in-the-know. We'll bring you the most relevant peer-to-peer conversations happening in the trade and tips and tricks to help you get the job done. Invalid email. This is required. Login to Your Account. Remember Me? Register Forgot password? What's New? Forum Manufacturing Today General relief angles for acme threading? Results 1 to 5 of 5. Thread: relief angles for acme threading?

Thread Tools Show Printable Version. I'm going to be single pointing some high helix 6. Material is stressproof. This will allow me to rotate the tool to accommodate the helix. What about top rake? Thanks, Cole. ColeBobw liked this post.

I don't have a top notch holder, but their drawings were helpful. Philabuster liked this post. Originally Posted by Cole Thanks Forrest.

Back to grinding up a square tool!

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Tags for this Thread acmehelixreliefsingletop. Bookmarks Bookmarks Digg del.Log In. Stub thread Cockroach: I too use Stub Acme in place of Standard ACME due to space contraints and I often wondered if, from a stress and shear standpoint, if the two thread forms are equivalent. Any thoughts? RE: Standard vs. Stub thread Stub or modified acme is beneficial to the thread rolling process. It minimizes metal deformation and maximizes tool life. In multiple start acme's like two-start, three-start, etc.

On single starts we generally specify 20 deg pressure angle, which gives a tooth included angle of 40 deg. A 60 deg included angle would produce a higher friction thread for a power screw. Stub thread From a manufacturing view, "plasgears" is correct for thread rolling. However, the vast majority of Acme, Stub Acme threads are cut, profile inserts being extremely common from supply houses.

Any other discussion regarding friction is completely off base since from a conceptual view, stresses associated with thread stripping are not addressed. To answer your question "zakk", consider a 4. The shear area of the pin screw are less than that of the box nuttherefore the pin ALWAYS fails before the box threads.

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In terms of pin shear area per unit length of thread the Acme is 8. This is due to threading geometry for basic major, pitch and minor diameters: 4. I would concurr with your thoughts, the Acme and Stub Acme threads are virtually identical, stress performance wise. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

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stub acme thread relief

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Related Projects.Calculation can be done for tolerance classes of 2G, 3G and 4G. Tolerance class 2G is the preferred class but if less play and backlash is needed, 3G or 4G can be selected.

ACME thread form is a trapezoidal screw thread profile used for lead screws power screws. In case of a lateral force, external and internal threads contact each other at the major diameter of the thread.

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This helps to keep alignment of the thread axis and prevents wedging. Chamfers: General Purpose external threads threaded rods may have the crest corner chamfer as shown in the first figure at the top of the page. Design Profile: The shapes of the external and internal threads in which the limits of dimensions are applied. Major Diameter: The maximum diameter of a thread which is diameter of the crest of a male thread or root of a female thread.

Minor Diameter: The minimum diameter of a thread which is diameter of the root of a male thread or crest of a female thread. For multiple start ACME threaded rods: major, minor, and pitch diameter sizes for each class are identical to those for single-start threads.

The thread height is 0. In general purpose form this is 0. Stub ACME thread form is provided for unusual applications where a coarse-pitch thread of shallow depth is required due to mechanical or metallurgical reasons. Thread class: A classification system to classify the threads for interchangeability and manufacturability. Please Wait Nominal diameter inches - threads per inch. Thread Tolerance Class 1. Number of Start 2. Nominal Diameter. Threads per inch. Thread Tolerance.

Maximum Major Diameter. Minimum Major Diameter. Maximum Pitch Diameter. Minimum Pitch Diameter. Maximum Minor Diameter. Minimum Minor Diameter. D max. D min. D 2max. Minimum Pitch Diamter.


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