Machsupport Forum

General CNC Chat => Show"N"Tell ( What you have made with your CNC machine.) => Topic started by: rcaffin on May 29, 2016, 07:01:18 AM

Title: Rotary Table for A axis
Post by: rcaffin 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

Title: Re: Rotary Table for A axis
Post by: Tweakie.CNC on May 29, 2016, 07:20:46 AM

Excellent work Roger.  ;)

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

Tweakie.

Title: Re: Rotary Table for A axis
Post by: rcaffin 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

Title: Re: Rotary Table for A axis
Post by: DICKEYBIRD 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.

Title: Re: Rotary Table for A axis
Post by: rcaffin 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