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Form Tap M8 x 1.25 RPM?

I'm looking to se up a customer performing a roll form tap operation on M8 x
1.25" holes.
CRS, 0.300" thick.
I'd love to know the RPMs you would run for a conservative process, minimal
coolant (not flood), etc.
My conservative number for a cut tap would be around 300-400 RPM. I'm
guessing a roll form tap runs slightly different numbers (HSS tooling).
Any input would be greatly appreciated.
Regards,
Joe Agro, Jr.
(800) 871-5022 x113
01.908.542.0244
Flagship Site:
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/ Pneumatic Drills:
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Spindle Drills:
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Tapping:
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V8013-R
Reply to
Joe AutoDrill
Loading thread data ...
Personally I'd run at 175-200 rpm. with an L tapdrill (0.290) or maybe an M (0.295)
Reply to
Just Me
I'm actually looking for the RPM for the tap process, not the drilling process.
Reply to
Joe AutoDrill
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
Reply to
Just Me
Gotcha. Thank you. I was wondering why the slow RPM on drilling. :)
Reply to
Joe AutoDrill
FWIW, that seems reasonable to me, ~15 SFM.
What kind of quantity?
Reply to
Kelly D. Grills
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.
Reply to
Joe AutoDrill
* Joe AutoDrill :
It's been a while (years) since I've used them, but IIRC not necessarily.
This may be helpful:
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That's alot of holes, _to me_. I'd maybe get a manufacturers rep. to to provide some assistance.
Reply to
Kelly D. Grills
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.
Reply to
Joe AutoDrill
Joe, The OSG site doesn't differentiate between roll or cut for speeds:
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They recommend 25-50 SFM for 1018, so 25 SFM is about 300 RPM and 50 SFM is about 600RPM
Best, Steve
Reply to
Garlicdude
* Garlicdude :
Guess I'm more conservative than you. Fscking lefties. ;-)
Reply to
Kelly D. Grills
What's with the trash talk, I give an on topic response and you come back with that?
Reply to
Garlicdude
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.
Reply to
Kelly D. Grills
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"
Reply to
"D"

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