Magnetic circle cutter for the plasma

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Needed to cut some circles... so heres what i came up with. Attached Images
Reply:Great job! . . . I looked at the picture and I see how it works! It looks like you can adjust it to cut smaller holes too, Right ? Hobart Handler 190Hobart Spool-Gun 100Lincoln 225 ACMiller & Pipeliner HoodDewalt 14" Chopsaw, GrindersHarris O/AVictor TorchCustom Built O/A CartCustom Welding CartHeavy Duty 16 Speed Floor Drill PressPipe-BenderDrill Doctor
Reply:I made one a long time ago but I had to drill a hole in the center and also in my bar to determine the size of the circle, work great but not infinite adjustment,    I will be making a new one with a magnet and sliding bar for adjustment    a lot like yours Thanks for posting it, great idea
Reply:you hit the nail on the head.  I needed a circle cutter and that was a great idea.  I am going to make one of those too.  richey
Reply:I make these for sale.Can extend to guide up to a 24" circle, or down to 1". Attached ImagesMarkI haven't always been a nurse........Craftsman 12"x36" LatheEnco G-30B MillHobart Handler 175Lincoln WeldandPower 225 AC/DC G-7 CV/CCAdd a Foot Pedal to a Harbor Freight Chicago Electric 165A DC TIG PapaLion's Gate Build
Reply:Originally Posted by MarkBall2I make these for sale.Can extend to guide up to a 24" circle, or down to 1".
Reply:Aqua simplicity at it's finest.  Looks good & simple.Crabo PM inboundLast edited by MarkBall2; 04-04-2013 at 12:33 AM.MarkI haven't always been a nurse........Craftsman 12"x36" LatheEnco G-30B MillHobart Handler 175Lincoln WeldandPower 225 AC/DC G-7 CV/CCAdd a Foot Pedal to a Harbor Freight Chicago Electric 165A DC TIG PapaLion's Gate Build
Reply:Nice job too, Mark! Hobart Handler 190Hobart Spool-Gun 100Lincoln 225 ACMiller & Pipeliner HoodDewalt 14" Chopsaw, GrindersHarris O/AVictor TorchCustom Built O/A CartCustom Welding CartHeavy Duty 16 Speed Floor Drill PressPipe-BenderDrill Doctor
Reply:Nice stuff!
Reply:That's cool. I didn't like the magnet set up as I found it slipped to easy and didn't want to remeasure each time I reset the diameter. My solution was a 16" piece of 1"x1/8" flat bar, holes drilled every inch that the tip of my plasma torch fit in, 1/8" hole for the center pin, sm. bolt at the other end for a handle. Works great. I cut mirror frames out with it. Easily go from one hole to the next to cut successively smaller frames. Just throwing it out there as another way of skinning the cat.200amp Air Liquide MIG, Hypertherm Plasma, Harris torches, Optrel helmet, Makita angle grinders, Pre-China Delta chop saw and belt sander, Miller leathers, shop made jigs etc, North- welders backpack.
Reply:Bert, that's an excellent idea......................Hmmm, gives me ideas..........................LOLMarkI haven't always been a nurse........Craftsman 12"x36" LatheEnco G-30B MillHobart Handler 175Lincoln WeldandPower 225 AC/DC G-7 CV/CCAdd a Foot Pedal to a Harbor Freight Chicago Electric 165A DC TIG PapaLion's Gate Build
Reply:Originally Posted by bert the welderThat's cool. I didn't like the magnet set up as I found it slipped to easy and didn't want to remeasure each time I reset the diameter. My solution was a 16" piece of 1"x1/8" flat bar, holes drilled every inch that the tip of my plasma torch fit in, 1/8" hole for the center pin, sm. bolt at the other end for a handle. Works great. I cut mirror frames out with it. Easily go from one hole to the next to cut successively smaller frames. Just throwing it out there as another way of skinning the cat.
Reply:I'll try to remember. It really is as simple as it sounds though! Quick and easy too!200amp Air Liquide MIG, Hypertherm Plasma, Harris torches, Optrel helmet, Makita angle grinders, Pre-China Delta chop saw and belt sander, Miller leathers, shop made jigs etc, North- welders backpack.
Reply:I can't make up my mind,,,,,,Magnet or center pin, i can see the pro's and con's of both, and where does one get these magnets, i should make one of each.....
Reply:Im thinking if you want serious holding power but don't care that the circle would start at about 3 inches, get one of those welding grounding magnets. Like from HF or somewhere?
Reply:Yes picked it up at Harbor Break....holds 95 lbs and It never moved when I used it. Attached Images
Reply:I picked up a magnet the other day while out shopping with the wife. When I finally get caught up with work I'll get at the circle cutter!Made up the training wheel guide the other day and got to use it yesterday. I inadvertently made a line guide in the wheel guide when I cut the split to clamp to the cup. I just line up the split in the guide with the line I am following on the work piece and push. Work beautifully!
Reply:My only thought with the magnets would be slippage, but those that have them say it hasn't been a problem. Also, and this would be the killer for me, is I cut consecutive mirror frames. Cut the first largest circle, go in 4" and cut the next, that's one frame. From the center cutout, I do this again, and then a third time with the center of that one. 3 frames total. They all must have the exact same pivot point. I think the magnet would shift as each frame was cut from the center. Then I'd be screwed. If you just cut round disks and/or needed to avoid a pivot hole in the center for the finished product, then a mag. would be fine. But for perfect repeatability for production, I'd go with a pivot pin. But nothing says you can make yerself both! Not like they are expensive to make.200amp Air Liquide MIG, Hypertherm Plasma, Harris torches, Optrel helmet, Makita angle grinders, Pre-China Delta chop saw and belt sander, Miller leathers, shop made jigs etc, North- welders backpack.
Reply:HF magnet is it....for wheels u should use the tapered hardened cutting wheel that are used in pipe cutters, u can buy just the replacement wheel.......
Reply:Originally Posted by bert the welderMy only thought with the magnets would be slippage, but those that have them say it hasn't been a problem. Also, and this would be the killer for me, is I cut consecutive mirror frames. Cut the first largest circle, go in 4" and cut the next, that's one frame. From the center cutout, I do this again, and then a third time with the center of that one. 3 frames total. They all must have the exact same pivot point. I think the magnet would shift as each frame was cut from the center. Then I'd be screwed. If you just cut round disks and/or needed to avoid a pivot hole in the center for the finished product, then a mag. would be fine. But for perfect repeatability for production, I'd go with a pivot pin. But nothing says you can make yerself both! Not like they are expensive to make.
Reply:Thanks Jman. Sold a couple dozen of each at this point. Fun to do once you get a good system going.....and don't get glass with little scratches!! 200amp Air Liquide MIG, Hypertherm Plasma, Harris torches, Optrel helmet, Makita angle grinders, Pre-China Delta chop saw and belt sander, Miller leathers, shop made jigs etc, North- welders backpack.