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Old 04-26-2020, 08:34 PM
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Default Plasma Cutter Circle Jig Mod

When Norm and I cut the OD and ID of the stack damper flange rings, I was above the maximum diameter of the original rating of the circle cutting jig. It maxed out at 30" and we needed 35-3/4" OD and 32" ID. To cut the diameters, I made a adhoc adapter, that while crude, it worked.

Part of the problem was the multiple circle jigs, I bought all fit in to an 18" long tool box, I could have made a longer rod, but it would not then fit into the box and then either would have got lost or damaged. So I made a coupling to all me to use 2 of the longest rods, that fit into the box, to now gives me a maximun cutting diameter of 68". As the chance of me cutting any thing bigger than 68" is extremely slim, but I have done 52" in the past, but that was a struggle, as the sheet of 3/8" steel was 60" by 60", hard to handle and transport.

the adapter sleeve is simple, I had a left over piece of 3/4" shafting, that I cut to 3" long, bored to 3/8" hole, then drilled and tapped for (4) 1/4"-20 set screws.
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Last edited by platypus20; 04-28-2020 at 08:48 PM.
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Old 04-26-2020, 09:38 PM
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NY ingenuity at work.
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Old 04-26-2020, 11:24 PM
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I have a set of trammels that use a round rod, and there’s a coupler like that for it.

You may want to put a small flat on the ends of the rods for the set screws, that way any burr raised up won’t jam your coupling on the rod.


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Old 04-27-2020, 05:59 AM
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Nice job.


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Old 04-27-2020, 08:20 AM
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I think that idea will be useful on my torch circle burner.
Nice job, Jack
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Old 04-27-2020, 10:43 AM
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I have not seen the original build.

what's the other end look like ?
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Old 04-28-2020, 04:03 AM
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Here I have to make do with 2 pcs of all thread rod and a sleeve nut.

You guys are too fancy. lol

Nice set Platy
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Old 04-28-2020, 07:24 AM
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Quote:
Originally Posted by LW Hiway View Post
Here I have to make do with 2 pcs of all thread rod and a sleeve nut.

You guys are too fancy. lol

Nice set Platy
This is all a level up from where I work. I've just used a scrap of plywood or OSB with a couple appropriately spaced holes and a central pivot pin in a centre hole. Virtually free and infinitely adjustable with a built in torch standoff.
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Old 04-28-2020, 05:51 PM
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Quote:
Virtually free and infinitely adjustable

Nice stuff is still nice stuff. I'd be choosing a color scheme. lol
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Old 04-29-2020, 08:40 AM
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If anybody could benefit from a small cnc plasma, you are the perfect candidate.

I used to make every bolt tab, hinge, escutcheon, etc., by hand. Stacking and tacking them together for uniform finishing. I am talking many thousands of parts over years. Now I do it all on my little plasmacam. Over this last weekend, my son and I were working on his freshly painted mustang in my shop. I needed to make two backer plates for the bolts that hold the exhaust hangers. It took me hours of dragging my feet before I could start. It probably took 15 minutes to actually cut the bar stock, nipper off the corners, punch the holes, drill & tap. But I have gotten so spoiled that my handmade tabs have left me wanting, and not wanting to do it.
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