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Author Topic: Rotary Table for A axis  (Read 2892 times)

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Offline rcaffin

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Rotary Table for A axis
« on: May 29, 2016, 07:01:18 AM »
5" rotary table for A axis, using a 50:1 shg-25-50-2uh harmonic drive (second hand from Korea, via eBay).
Shown here machining pulleys for GT2 belts.

Cheers
Roger

Offline Tweakie.CNC

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Re: Rotary Table for A axis
« Reply #1 on: May 29, 2016, 07:20:46 AM »
Excellent work Roger.  ;)

(just out of curiosity, how much was the s.h. harmonic ?).

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline rcaffin

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Re: Rotary Table for A axis
« Reply #2 on: May 29, 2016, 08:15:32 AM »
Hi Tweakie

Sorry, can't remember!  A couple of hundred dollars I think. A bit less than listed on eBay - I 'negotiated'.
There's almost $100 worth of Fortal aluminium in there too, plus a good small stepper. The toothed belt drive uses pulleys i had to make myself. Plus the 5" chuck of course.
I may have slightly overdone the robustness - not sure. It weighs a ton when I put it on the mill table.

See http://www.cnczone.com/forums/linear-and-rotary-motion/261174-cnc-engineering.html for a full write-up and testing.

It looks exactly like this one:
http://www.ebay.com/itm/HARMONIC-DRIVE-REDUCER-SHG-25-50-Type-HD25-50-RED-I-116-/201557014777?hash=item2eedbbf8f9:g:WMgAAOSwq19XBkj0
but the vendor might be different.

Cheers
Roger

« Last Edit: May 29, 2016, 08:19:18 AM by rcaffin »
Re: Rotary Table for A axis
« Reply #3 on: May 31, 2016, 11:44:53 AM »
Wow, what an enjoyable thread that was!  It's always great to see excellent work done by someone that knows what they're doing & takes the time to document it clearly for others.  I also enjoy the frugal approach ie: utilizing bargain parts whenever possible & explaining the choices & the process of seeking out the goodun's.
Milton from Tennessee ya'll.

Offline rcaffin

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Re: Rotary Table for A axis
« Reply #4 on: May 31, 2016, 06:08:58 PM »
And the really good bit?
It actually worked to spec!
One always wonders a bit beforehand.
Cheers
Roger