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Re: Chuck Jaw Issues Unimat Selecta


 

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  • light cuts
  • sharp tool with approx correct rake for the material
  • approx correct speed for the material
  • support at the tailstock end if the material is say greater than 3 times longer than its diameter or 3 times longer than the jaw
  • use the tommy bars to clamp the work firmly in the jaws (1/8" Meccano aka Erector rods are about perfect of you don't have the originals)

The 3-jaw chuck won't centre precisely unless you are very lucky, so until you've taken some metal off all round, it will cut on one side and not the other - so use *very* light cuts at first else the tool will bang onto the metal and stick until it is cutting all round.

Maybe I'm not a beginner anymore !


On 06/04/2020 16:46, Daniel via groups.io wrote:

Hi there?
I've been trying to centre just round peices of steel and aluminium but just having too much luck, I also don't know anything much about machining or this lathe, so I have no idea what I'm doing just trying to work things out. ?

Also I cant seem to find much out about the selects model the most common seems to be the sl and dB series and I'm not sure how similar they are ?

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