"Pete Logghe" wrote in message
m...
"PrecisionMachinisT" wrote in message
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"markzoom" wrote in message
om...
(Charles A. Sherwood) wrote in message
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I recently bought a used rockwell mill. There is no drive pin in the
spindle that is suppose to engage with the R8 collet. My other mills
do have drive pins. Is this a problem that I need to fix??
I seem to remember this question before and it might be ok??

thanks
chuck

I would say the advantages of leaving it out outweigh the
disadvantages of having one.
Having read some of the replies below, there seem to be two kind of
people:
Those that do everything by the book and those that take risks.

I bet you the ones that do everything by the book and claim to be
"good" engineers, will still make the mistake of trying to do up the
drawbar with the pin misaligned at least once, possibly causing
damage.
Also, I doubt that they are the "innovative" type. They are generally
great at doing things to plans, but crap at coming up with anything
new.
I would say that a "good" engineer is one that comes up with accurate
and innovative engineering regardless of the quality of the tools.
A "good" engineer also minimises the risk of ****-ups. I would
therefore leave the pin out for tooling that does not need it because:

1) You'd have to be a complete imbecille not to be able to tighten the
drawbar correctly without the pin in.
2) The collet is only likely to slip if you make a bad mistake, and
then it's safer if it does slip.
3) The advantages posted by others.


Use it for a boat anchor and get a machine with a 40 or 50 taper
instead--yes, that would be one that has drive keys......


Do you mean like a piece of junk Bostomatic that doesn't use drive keys?
But relies on the 40 taper to hold the tooling?



Naww, I would prolly hang onto that one.

--

SVL