Roll Tap Miniteeth
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Posted by: manojkabre ®

05/19/2006, 02:30:15

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We are using Roll Tap of M 1.6 X 0.35 at an RPM of 540, using Suhner tap attachment on 17-4 PH Material, with hardness of 24 RC. We are facing the problem of thread-jamming while inserting the screw using pnuematic gun , though the thread answers the thread gauge. We have observed a mini-teeth at the minor diameter of the thread

Can you suggest the reason of this problem ?

Do you suspect the hardness of the component an issue ?

Thanks

Manoj








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Re: Roll Tap Miniteeth
Re: Roll Tap Miniteeth -- manojkabre Post Reply Top of thread Forum
Posted by: randykimball ®
Barney
05/21/2006, 10:08:19

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1. Make sure the thread attachment is not running out of travel.
2. Have you tried a different brand of screw?
3. You may need to go to a larger GH size of tap. (As I remember, years ago we were making parts for Bell Helicopter with 1/4-28 threads in a stainless part. We had to go up a GH size to get a fit because of the hardness of the stainless and the tendency of it to cut a tight thread.)
4. You may have to expermint with the coolant you are using.

[my bet - you will go up a few .00mm tap size to the next GH to correct the problem] > incase you don't know - down a GH size will allow you to make a threaded hole fit for a stud grip using standard threaded rods - up a GH size will allow a tight hole to be tapped slightly larger - look on the taps for the GH you are using. ... Then ask you tap supplier for assistance.... AND buy GOOD taps.





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