Converting a lathe, need coupler recommendation

[lloydsp]

Hi,

I'm converting a 13x40 conventional gearhead lathe.

I'm using metric servos.  Do any of you have recommendations on a coupler system for the x-drive, which will be direct-drive? (Z is belt driven... I can figure that one out  )

Thanks,
Lloyd

[Hans_G]

I prefer Oldham couplings.  Good combination of price and stiffness (no backlash).   

[lloydsp]

Thanks... I was also considering them for their low mass.

LLoyd

[Hans_G]

I should've mentioned... Misumi is a good source, especially since you're going metric.  And of course you can always make your own.

[Bob La Londe]

If the screws are properly supported with bearings and an appropriate amount of preload wouldn't helical couplers be very good for this?  Seems they would make up for any minor misalignement, have very low backlash, and have some spring/spring back in the event of a momentary over heavy load.  

P.S.  I would love to see some photos and a log of your conversion.  I just picked up an old 8.5 by 18 I want to do a CNC conversion on if I can fix some problems with the saddle.   

[Bubba]

I prefer Oldham couplings.  Good combination of price and stiffness (no backlash).   

I second that. I make them for my machine, simple,very easy to do..