Hi all I have an opti mill. When milling my Morse taper collet chuck appears to be vibrating loose. During the install I use the draw in rod to pull it up and the tighten it firm but it may last only 15 mins before it starts to drop and disengage. When this happens I notice th draw in rod at the top is loose ( not pulled up firm ). I have done a good job of securing my work piece. Is there a link for a proper set up procedure of this nor a YouTube vid ?
You need to sort out more stable drawtube holding. Obviously. Scant other option. Might be an easy fix, but a need to modify is more likely.
The
reason it struggles is not new.
A discussion ran heavy in the trade journals, late 1800's. Brown & Sharpe's works manager, Oscar J. Beale - pen-name 'jarno' - a major contributor.
Bottom line is it became well-known that a Morse taper was well-suited to drilling, where the force is on the long axis, yet the tools could be gotten out of the spindle with not a lot of hanging-up.
B&S taper was not good at drilling, because it DID tend to hang-up, become hard to remove.
Morse was found unsuited to milling. side forces cause it to want to work loose.
B&S taper worked fine for milling, had much less tendency to walk loose.
Oscar - (at and running B&S ) - "Jarno" taper contribution to the mix is a compromise, elegant more in its dead-easy derivation math as much as its utility, so it only saw limited adoption of any kind.
"Opti" - when choosing Morse taper for a
mill, just overlooked what was solidly established by 1890 if not earlier is all. Morse for drills, B&S for mills.
(NMTB..CAT, BT... HSK... Capto.. all came MUCH later).
"Those who do not learn from history..." etc.