Thread milling shallow bind hole

**suesi34e** · 11-12-2015

Hello all

I am needing a little advise please! I don't know about thread milling. What I am wanting is some blind holes in 316 thread milling to take a m12 thread. Could a 6mm deep hole be thread milled or is that just silly and totally impractical? The thread are just going to be little blanking caps just held on with a bit locktite.

Cheers now

Steve

**mekanik** · 11-12-2015

Hi Steve
No logical reason why you can't do it, hole will have to be flat bottom then i would undercut to slightly over thread dia with tool just clear of bottom of hole then run your thread.
Regards
Mike

**suesi34e** · 11-12-2015

Hi mekanik
I appreciate you taking the time to reply. It is great that can be done, I am a happy! Had it not have been feasible I would have been in for a pig of job.
Many thanks
Regards
Steve

**Clive S** · 11-12-2015

Originally Posted by suesi34e

Hello all

I am needing a little advise please! I don't know about thread milling. What I am wanting is some blind holes in 316 thread milling to take a m12 thread. Could a 6mm deep hole be thread milled or is that just silly and totally impractical? The thread are just going to be little blanking caps just held on with a bit locktite.

Cheers now

Steve

Could you not just epoxy the caps in? or do they need to be removed?

**jamesgates1000** · 11-12-2015

You could also use a roll tap, just interpolate a flat bottom hole first then tap to depth. A roll tap would be cheaper than a thread milling cutter.

**komatias** · 11-12-2015

Originally Posted by jamesgates1000

You could also use a roll tap, just interpolate a flat bottom hole first then tap to depth. A roll tap would be cheaper than a thread milling cutter.

Woukd nit fancy my chances of forming M12s in 316, the bugger galls to easily
Be sure to get a threadmill that is big enough to cut the pitch you need. Bought a 6mm one the other day, can only do up to 1mm pitch....

A larger threadmill will do smaller pitches though may not be able to get into small holes

**njhussey** · 11-12-2015

I've been looking into threadmills as it sounds like good sport

....anyone got a good source for them?

**mekanik** · 11-12-2015

Hi Steve
You would be as well doing some test pieces first, as stated Stainless is a bugger.
What's the application ?
Regards
Mike

**komatias** · 11-12-2015

Got mine at drill services.

**jamesgates1000** · 11-12-2015

I have used thread Mills from wnt or cutwel, both supply quality tools. Roll tapping stainless isn't a problem if you use a good quality roll tap and plenty of rocol.