Rotary Broaching Tool Holder

[DaveH]

(08-14-2013, 01:33 PM)oldgoaly Wrote: it's the spinning that has me stumped!

You may well be 'stumped' but the umpire has given you not out.

The tool bit is spinning and the work piece is spinning both at the same speed, therefore the tool bit is stationary with respect to the work piece. The spinning causes the wobble, it's the wobble (of the tool bit with respect to the work piece) that produces the cutting action.
This video shows how it works - This is on a milling machine the cutter and the work piece are not rotating, but the milling machine spindle is and that cause's the wobble.






DaveH

[Micktoon]

Thanks for posting that Dave , that has made it more clear how it works ..............still have the feeling if I tried it , it would not work lol.
Cheers Mick

[oldgoaly]

I'd be spending days trying to get rid of the wobble! So the 1 degree is the allowance for the wobble?

also watched a few of the other broaching videos, the cutting teeth in the lathe was interesting, but when you have a small shaper that you have all of 25$ in it, save the wear and tear on the lathe use the shaper!

I once played Cricket and the umpire gave me a second chance, the bowler threw at my feet, I was airborne taking a swing at it. Second chance, I damn near took his head off <grin> Second time around made that big dumb Aussie look foolish stumbling after little ball. Sad they didn't let me pitch, I'd would have given some one brain damage. <grin>

Sorry to get so far off topic but the umpire reference brought back some good memories!