Interesting approach for the taper. This is of course a method of machining all kinds of tool-holders etc. Concentricity is effectively guaranteed. It would be kinda difficult to get it wrong.
Phil
Originally Posted by odonatas  Tormach offers a machinable blank part 30475: TTS Machinable Blank: Hardended and ground TTS geometry on the spindle end, but the working end is 39 mm x 60 mm cylinder of unhardened steel.
I'm thinking you could mount the blank in the spindle and a lathe tool in the vise and program in the taper. To get a ground finish mount a piece of steel with a straight edge set at the taper angle in the vice. With the spindle running bring the steel close enough to the taper so that a piece of aluminum oxide cloth will be lightly trapped between the steel and the TTS blank and pull the abrasive through. A squirt of WD 40 helps to keep the particles from clogging the abrasive too quickly.
Setting the steel at the right taper isn't all that difficult. Just press it up against the turned blank and snug up the vise. Back the table off a .001 or two and shine a light in the gap and tap on the steel if it needs adjustment.
To check the taper fit smear a little lipstick or Prussian Blue on the female taper and see if there is an even transfer onto the male part after twisting them lightly together.
Odo |