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Newbie question MT3 collet chuck

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fatoftheland:
Hello, I have a Warco 918 and want to fit a collet chuck to it. I know how to fit and remove my standard 3 and 4 jaw chucks but MT3 collet chucks have a taper with a drawbar thread. Do I need a drawbar on my lathe or is it just an interference fit? Confused!
Thanks


Jon

John Rudd:
Jon,
IIRC, the 918 has a thread nose on the spindle....
There are 2 ways to do this, you could use the method you suggest and use a draw bar, else the 2nd is to buy an  ER chuck that mount on a backplate....like this...

http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Lathe-Collet-Chucks...
If you already have the MT3 ER chuck, then the cheapest option is to use a drawbar..

fatoftheland:
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.

John Rudd:
Tbh, it doesn't need to have a shoulder , a flat washer big enough to go over the spindle bore....
I use a piece of M12 studding with a nut and the washer is made from aluminium....
The ally is soft enough not to deform the end of the spindle, not that the nut needs to be tight....
I just screw the stud into the thread in the taper, fit washer add nut and just nip it up....over tightening just causes aggro when you come to remove it...

HTH....

chipenter:
A washer with a shoulder is quicker to set up , I have made a short converter 3\8 whit to 12mm that fits imperial collets and only need one drawbar , morse and clarkson go to 3\4" ER32 go to 20mm , if you go for ER you wont need a drawbar as the collets dont have a pocket and long stuff can go up the spindle .

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