O/T tapmatic heads

[George_Gerhard]

Does anyone have any experience using tapmatic heads in a router spindle. I am trying to help one of my customers with a HSK63 router spindle, I tried to tap a 1/4X20 hole at 500 rpm and I stalled the spindle, and you could guess what happened to the tap. I tapped the same hole at 1500 rpm the spindle did not stall but the quality of the thread was poor. I used a 2 flute gun tap, I dont remember the feedrate, but it was the correct feed for that rpm and pitch. Basically my question is should I be looking at some other kind of taps?

 

thank you

George

[mold100]

Not familiar with router set up whats the material

type?

[Jimmy Wakeford from Barefoot CNC]

George

Router spindles arent really designed for tapping.

You would be better off using thread mill.

Let us know if the tapomatic head works though as this would be useful info.

[George_Gerhard]

Hey Jimmy

Its a Northwood router with the HSD HSK63 spindle 20 HP. The material is 6061 aluminum

Tapmatic swears people tap at 1000-2000 rpm

Our customers does not want to do thread milling, I guess he is figuring the tap head is faster

 

regards

George

[sideliner]

I do beleive tapmatic has a spring collet so you might want to try feeding out at 90% feedrate.

this has worked for me in the past.

[J Coulston]

What is the model of tapping head. In aluminum I run 1/4-20 1500rpm 95% feed G85 no dwell Tapmatic CST-25. For 0-80 roll tap I run 3100rpm, thousand of hole per tap ten times faster than ridged tapping.

What was the drill size (.201)? Stalled a 20hp spindal, must not have any low end torque.