Form Tap M8 x 1.25 RPM?

Personally I'd run at 175-200 rpm. with an L tapdrill (0.290) or maybe an M (0.295)

I'm actually looking for the RPM for the tap process, not the drilling process.

That was tap RPM, I have found in general that roll tapping steel is a bit slower that cut tapping,but thats just me and I'm generally cautious . The TD was just in case

Gotcha. Thank you. I was wondering why the slow RPM on drilling. :)

FWIW, that seems reasonable to me, ~15 SFM.

What kind of quantity?

So essentially, form tapping runs at a slowr RPM than a cut tap process?

As far as quantity... The end user will probably tap 1500 holes per day across a fixture of three machines - or 500 holes per day per machine.

• Joe AutoDrill :

It's been a while (years) since I've used them, but IIRC not necessarily.

This may be helpful:

That's alot of holes, _to me_. I'd maybe get a manufacturers rep. to to provide some assistance.

Working on that actually... But the customer doesn't know what manufacturer they are going with yet for the tooling.

I told him to choose the type (HSS) and then I could at least choose a motor and gear reducer for my machine... Fine tuning the RPM is simple after that, but only if I have a number to start with can I get to that point.

Open to more answers, but happy with the ones I've received. Thank you.

Joe, The OSG site doesn't differentiate between roll or cut for speeds:

Best, Steve

• Garlicdude :

Guess I'm more conservative than you. Fscking lefties. ;-)

What's with the trash talk, I give an on topic response and you come back with that?

Sorry, guess there's no context there. The original post asked for a conservative spindle speed, I said ~15 SFM in an earlier follow up.

My comment was in fun, please don't take it any other way.

The internet needs a universal "smiley" for humor and sarcasm in the same sentence, maybe "TIC" "Toungue in cheek"

Anywhoo, a form tap needs some rpm to roll the thread, my experience has been to run at the upper edge of the recommendations. Also, a good coating would help in the limited lube environment you referred to in your o.p., either Tin or Tialn would give you great tool life and produce a good quality thread.

"D"