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Thread: Spiral Point Taps.

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Old 09-07-2004, 09:50 AM   #1
Ace
Rock Crawler
 
Join Date: Apr 2004
Location: Longmont, CO
Posts: 901
Default Spiral Point Taps.

I posted this in another thread to SR5Dave, but I thought it would be of interest to all.

If your tapping with standard taps and having a hard time of it, pick up a set of spiral point taps. I promise you won't be disapointed!

I have this set, and highly recommend it, also includes the proper drill size for each tap:

http://www.use-enco.com/CGI/INSRIT?P...PARTPG=INLMK32

Smallest is 6-32 though, so be sure to order a 4-40 spiral point if needed.

This lube is awsome too, for tapping and drilling:

http://www.use-enco.com/CGI/INSRIT?P...&PMPXNO=940175
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Old 09-07-2004, 10:06 AM   #2
Rock Stacker
 
Join Date: Aug 2004
Location: North Lincolnshire, UK
Posts: 71
Default Re: Spiral Point Taps.

Spiral points are normally used on machines/tapping heads. The problem with them is they have a much longer taper lead on the nose of the tap which limits the depth of thread cutting for a blind hole unless you drill much deeper - not normally a problem though.

You can also modify them by grinding the nose of the tap off a few mm or 1/8inch short of where the full thread starts but still leaving enough lead on it to allow you to get a start when hand tapping but allowing a better depth of thread or a shallower hole.

I usually grind a slight taper on my normal hand taps anyway to help getting a start in the hole. Only takes a few seconds on a bench grinder.

PS. If anybody ever runs out of tapping lube and needs a thread cutting urgently try using WD40, it makes things alot easier than dry cutting and lessens the chance of breaking the tap. I use it alot when cutting aluminium which tends to 'stick' to the tap otherwise.
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