On Jun 17, 7:43*am, Jim Wilkins wrote:
On Jun 17, 1:46*am, Searcher7 wrote:
On Jun 16, 6:53 pm, "DoN. Nichols" wrote:
...
Now this is what's been bugging me. 3C will fit into my MT3 lathe
spindle, and MT3 collets will fit into my MT3 lathe spindle, correct
The 3Cs at LMS go as high as 1/2" and only allow a diameter as high
as .467 through the collet.(The site doesn't mention these specifics
for MT3 collets).
Now since my spindle bore is .787, wouldn't a collet set that fits my
lathe spindle *and* allows diameters up to 3/4" be better?
...
The closer tube eats into that 0.787". For my 5C set the tube OD is
1-3/8" (1.36"), the maximum ID is 1-1/16" (1.08"). The threads and the
wall thickness inside and outside them take up the rest.
I'm just a little confused by this. The last sentence in that
paragraph to be exact. The difference between the I.D. and O.D. of the
drawbtube is .28". Since it fits *around the collet, the drawtube
doesn't determine the maximum stock one can pass through the spindle,
correct?
You don't have to cover the full range with one type of collet. With
MT3 the only overhead is a threaded-rod drawbar and a nut and washer.
They don't cost you another spindle adapter if they fit already. You
could buy only the sizes above the range of 3C.
Here's a good example of available choices:http://www.finelinehair.com/home/9x2...lets_and_Adapt...
Since these are tool holding collets and don't allow stock in the
spindle I'll have to pass on them.
If you can pass the rod stock through the spindle you can machine a
part on the end with access to its entire length. Otherwise you have
to plan how to machine the area clamped within the collet or chuck
jaws in a second operation with less centering accuracy, or waste some
material, or hold it between centers. The difference is mostly
convenience and forethought.
?!?
It sounds like you're just saying that when passing the stock through
the spindle, a longer length of stock can be machined without un-
clamping. (Which is the same as saying to just use longer stock).
Thanks.
Darren Harris
Staten Island, New York.