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Newbie question MT3 collet chuck

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John Rudd:
Oops, yeah I forgot to mention, if you go the backplate mounted collet holder route, as I linked to, as Chipenter says, long stock can go through into the spindle and beyond  if needed....but obviously if you go the MT route you can't do that.... :doh:

Manxmodder:

--- Quote from: fatoftheland on February 28, 2015, 07:21:22 AM ---Thanks for the speedy answer and the welcome.
My first project will be a drawbar with some sort of centring plate for the spindle hole.

--- End quote ---

Jon,
Just to second what John Rudd has said,if you go for the draw bar setup don't over tighten it,a light nip is sufficient.

 Morse tapers are very shallow angled creating a high degree of wedging action with a comparatively large surface area and over tightening is a common error made by beginners to lathe practice.....OZ.

sparky961:
I see some talk of "if you use a drawbar" - would you really trust the taper to hold while turning a part in the collet without one?

A drill chuck I get because almost all of the force is locking the taper even tighter.  But when turning, especially if you are applying force away from the chuck, I don't think I'd feel comfortable without something positively keeping the taper in place.

Having MT3 as the main taper in my combo-mill spindle, I know first hand that those buggers really lock up tight with too much force.

DMIOM:
Sparky,

The original query was how to mount a collet chuck, possibly MT3.

In John's message (post no. 2) he suggested (a) Morse Taper plus drawbar, or (b) mount a collet chuck on a backplate on the spindle, which wouldn't need a drawbar and would leave the spindle bore free for longer stock.

vtsteam:
They don't always stay in a drill press quill, either.......  :(

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