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| ACME thread designation / callout | |||
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| Posted by: GearDrive ® 01/26/2010, 10:35:09 Author Profile eMail author Edit |
I need help with an ACME thread callout on a drawing. We are purchasing two locknuts for a bearing application and the vendor lists the thread as a major diameter, the number of threads per inch 5 and class ACME 3G. The two dimensions are 15.745 and 13.339 inches. What is the correct thread callout that I need to put on the drawings for the mating threaded shafts for each of these? The vendor gives major diameter max. and min for the threaded shaft of 13.3030/13.2870 & 15.7090/15.6930 respectfully. I don't have a chart that goes that large of diameter and could not find anything in my searches. The vendor was no more help than their current documentation. I may guess at the one and make it 16-5 ACME 3G (not sure and want to be accurate) but the other seems odd (maybe 13 1/2-5 ACME 3G). |
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| : ACME thread designation / callout -- GearDrive | Post Reply | Top of thread | Engineering Forum |
| Posted by: Kelly Bramble ® 01/26/2010, 10:53:46 Author Profile eMail author Edit |
For ACME threads one calls out the major diameter - threads per inch and thread class or quality. For ACME threads the thread class - lowest being a 2G then a 3G, 4G and high accuracy 5G defines the pitch, minor diameter and tolerances of these features. Modified by Kelly Bramble at Tue, Jan 26, 2010, 10:56:01 |
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| Posted by: GearDrive ® 01/26/2010, 12:03:11 Author Profile eMail author Edit |
Thank you Kelly. These are new type of threads for me and I am not used to their designations. So I would have shafts with callouts of 13.3030-5 ACME 3G and 15.7090-5 ACME 3G, the locknuts would be 13.339-5 ACME 3G and 15.745-5 ACME 3G. That is the way I understand it. Is that correct? |
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| Posted by: Kelly Bramble ® 01/26/2010, 17:14:57 Author Profile eMail author Edit |
For both external and internal ACME threads you would callout: Nominal major diameter - threads per inch - thread class
The Nominal Major Diameter should be identical for shafts and mating nuts. Modified by Kelly Bramble at Tue, Jan 26, 2010, 17:15:28 |
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| Posted by: GearDrive ® 01/27/2010, 08:27:27 Author Profile eMail author Edit |
That is what I am trying to find out - the correct nominal major diameter - for both threads. Are the 15.745-5 ACME 3G nominal major diameter 16 and the 13.339-5 ACME 3G 13 1/2? If this is correct then wouldn't the correct callout I would put on my drawing 16-5 ACME 3G and 13 1/2-5 ACME 3G? Modified by GearDrive at Wed, Jan 27, 2010, 08:28:08 |
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