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4mm is probably OK.
After all, the whole thing must be balanced anyway.. the only issue is fast slewing (and if there is no proper implementation of acceleration in the firmware).
My EQ6 has only 16x and 24x slew rate (no acceleration.. Darren's modification) so I am guessing even 3mm belt may be OK. If this proves not to be the case, I will use 6mm belts :-) (or 2x 3mm in parallel, however this option may prove to be more expensive).
BTW, I would turn the pulley, not the worm. It is always a risk of having something un-concentric when performing additional machining on the other than original lathe (unless you use pins for centring).. and the worm is much more expensive than pulley to be replaced.
At some stage I was considering steel chains.. but I could not find anything appropriate (narrow and small pitch enough)
Last edited by bojan; 06-04-2010 at 11:33 AM.
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