On 11/02/2013 11:13 AM, dave wrote:
On Sat, 2013-11-02 at 09:19 +0000, Steve Blackmore wrote:On Fri, 01 Nov 2013 08:22:26 -0700, you wrote:Hi all, I've often wondered how well a rotary table would work if driven by a reasonably stiff timing belt. Say 1" urethane with steel fibers. Gearing would be approx 5:1 and then a reducer if necessary to couple to the servo motor. Encoder would be mounted on an idler wheel driven by the 1" belt. I use a similar encoder setup on the Z axis of my mill and it seems to give rather good control at ~ 100K counts/inch. ;-) Has anyone tried this or something similar and what were the results. Stiff enough? Accurate enough? Of course everyone's definition of adequate is different but was it good enough to be usable?
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Dave, Tomaz's picture was interesting if 2 idlers are used the opposing tension is kinda anit-backlash and I'd try mounting encoder on one of the 2 tensed gears ( if you couldnt mount on axis proper, requiring thru hole ) regards TomP
<<attachment: Tomaz-IdlerAntiBacklash.jpg>>
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