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  #11  
Old 12-05-2022, 08:19 PM
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Quote:
Originally Posted by C6Z06 View Post
Another possible solution:
Copper strip? Perfect. Put enough tension on it and clean up the stub. I would shape the contact to give it more surface area.
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  #12  
Old 12-06-2022, 06:17 AM
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I would use a copper washer sandwich and spring load them to the center shaft.
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  #13  
Old 12-07-2022, 04:43 PM
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I got it all put together last night, and tried some welding. It worked, but the motor isn't quite fast enough, and not powerful enough.

I ordered the pictured motor & variable speed control which is 3 times as powerful and 3 times as fast (135 rpm). Obviously, it's going to need to be bolted down to a bigger support stand.
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Last edited by C6Z06; 12-07-2022 at 04:50 PM.
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  #14  
Old 12-11-2022, 07:34 PM
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Finished up the rotary positioner today. With the timing pulley arrangement as shown, top of the table has a speed range of zero to 1.5 rpm. An almost infinite combination of pulley sizes are available to adjust the speed range.

Of course, the optimal table rpm varies with the diameter of the piece being welded.
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Last edited by C6Z06; 12-11-2022 at 07:45 PM.
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  #15  
Old 12-21-2022, 05:03 PM
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My son Tan passed up on a big Yuasa rotary positioner that his college was dumping due to a renovation. Pretty much unused as it sat in the bottom of a cabinet for years. But it was huge (24" ?), probably weighed a couple hundred pounds at least.

I should have hauled it back home and mounted a chair on top.
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  #16  
Old 12-26-2022, 05:25 PM
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Default Finished positioner

I came up with a grounding setup where a spring loaded copper rod rides against the side of the rotary table. The rod bracket is insulated from the rest of the machine with nylon bolts and flat washers. Ground cable gets clamped to the vertical part of the rod holder bracket.

I switched motors and am now using a 100 rpm 12 volt gear motor, an 8 amp 12 volt Radio Shack power supply, and a variable speed control I picked up from Amazon.com.

Put together three clamping shaft collars and some scrap bar stock and came up with a super sturdy adjustable hand rest.
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  #17  
Old 12-26-2022, 08:00 PM
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Well Done!!!

Scott
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  #18  
Old 12-26-2022, 08:54 PM
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Looks good. Now I want to build one.


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  #19  
Old 12-26-2022, 09:13 PM
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Nice job!!!!!!!!!!!
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