HP Required To Run 1-5/8-12 Tap @ 75% Of Full Thread
HP Required To Run 1-5/8-12 Tap @ 75% Of Full Thread
(OP)
Like the title says, I need to run this tap on a quick repair project. I have a 20 HP Vert Okuma mill...
Anyone know the answer?
Anyone know the answer?





RE: HP Required To Run 1-5/8-12 Tap @ 75% Of Full Thread
RE: HP Required To Run 1-5/8-12 Tap @ 75% Of Full Thread
RE: HP Required To Run 1-5/8-12 Tap @ 75% Of Full Thread
Torque = K*Ct*Cm
Where K = material factor
Ct= tap condition multiplication factor
Cm = torque constant (metal removed per rev)
For 150 BHN Steel, k = 290000 in lbf/in^3
400 BHN Steel, k = 500000 in lbf/in^3
For a sharp spiral point tap, Ct = 1.0
For a dull straight flute tap, Ct = 2.5
For a 1.625-12 Tap at 75%, Cm = 0.00099 in^3/rev
So assuming some kind of steel, torque required will be anywhere between 24 ft lbf and 103 ft lbf. Your machine should be able to deliver that much torque.