Originally Posted by fireguy976  Thanks for everyones replys,
Ive got it figured out.
I can now see why alot of the Bridgeport users go to the impact wrench style of power draw bar.
Reason I say this is my machine came with a few bits of tooling, collets and such, but also a fairly large size fly cutter with 3 carbide inserts. It being a R8 style threaded insert, needs to be drawn up tight by the draw bar.
The quick change system would only benefit when the 3/4" collet can be left in place with use of the "stubby" tool holders.
The reason I say that is after reading about the automatic change system, the tension on the collet and the tooling is such that it needs to be set right, ie.. hand tight plus a turn for example. And if its necessary to change from 3/4 collet to fly cutter (or other large tool) it could be a pain having to precisely re adjust everytime.
I guess it comes down to how large a tool the operator is ever going to use or need to use,,, and can it be made, or safely be used in a 3/4" collet?
If tooling requirements are such that you are going to be using R8 shank items on a regular basis, then the power draw bar is the way to go.
If I have got this screwed up please chime in. You individual and collective experience is VERY much appreciated here. If can even call me grasshopper if you wish.........LOL
Thanks again,
Ken J |
Ken,
Drill chucks, flycutters, face mills, boring heads, etc. - all available, and work just fine, with a 3/4" straight shank. In fact, most of them have removeable shanks, and new shanks are about $20 each. I use a 4" flycutter with a straight shank - no problems whatsoever, even taking a heavy cut on steel. The Tormach collet is exactly like a normal 3/4" R8 collet, except with the face milled off. It will accept any tool any other 3/4" collet will accept.
Either the air ratchet or spring washer approach will both work fine. It's just a matter of personal preference. The advantage of the Tormach approach is you *can* make an auto tool changer later on if you want. That's not really practical with R8.
Regards,
Ray L.