Circle cutter recommendations

[GreenGrass]

Hello!
I have a Everlast Plasma Cutter 50. I am trying to get better large circle cuts. Can anyone recommend at circle cutter?

[sportbike]

Which part is the scrap (the remaining disc or the hole)? If you are trying to cut holes, than punching or drilling a hole in the center and using a bar the length of teh radius of the circle hooked to your torch and pinned through the hole should work.

A better way may be to use a macnet with a stud on it adn stick teh magnet to the center, then use the bar.

If it is aluminum, obviously the magnet won't work...unless it is relatively thin and you can put a heavy steel backer block in the center on teh opposite side.

John

Edit: Something like this might be handy to use, also to use as a ground for the plasma in the future...

http://www.harborfreight.com/magneti...ock-30754.html

[Ram48]

SWAG off road has a circle cutter that is inexpensive ans very accurate check it out at
http://www.swagoffroad.com/Plasma_Circle_Cutter.html

[sportbike]

SWAG off road has a circle cutter that is inexpensive ans very accurate check it out at
http://www.swagoffroad.com/Plasma_Circle_Cutter.html

That looks pretty good. And, if you can't drill teh center hole, the magnet woudl likely work for the pivot.

[scootarida1]

here is one that im making:

It consists of a small 2" magnet i found at the local hardware store, a bolt with a lock nut at through the middle tight enough to just spin freely, a shaft collar and a sharpened thumb bolt. The shaft will be a 5/16" rod with a shaft collar at the end to cup the torch. I will probably put some sort of bearing at the end by the collar to support the torch while rotating so the bearing make contact with the surface as you rotated and cut:

[geezer]

I have built a few devices to do just that, bottom line save your time and effort if you have a pp50 with an S45 torch, just drill a 13/32 hole in a piece of 1/2 inch plywood to stick the torch into and nail down the radius and go. the 1/2 inch plywood maintains torch height and it.s a cheap fast circle cutter. Magnets have a tendency to slide at the most critical times, they need a center stud to prevent that.

[parkour]

You could get an NdFeB (neo, rare earth) magnet like this one http://www.kjmagnetics.com/proddetai...SPC-BLK&cat=16

Put a flat head #10 machine screw in it and use that as the center of rotation. On the bottom, get a piece of thin self adhesive rubber (soft plastic) and that should keep it from sliding. Magnetic force diminishes increasingly fast with increasing gap, so you want something as thin as possible. Maybe a piece of duct tape or electrical tape stuck to the magnet.

The magnet I linked to is $15, and has a 20 lbf pull force. It will be less with the rubber on bottom, but the static sliding friction should be significantly increased.

[acourtjester]

HI
If your going to stick the magnet with tape try carpet tape it has sticky on both sides and is thin like duct tape.
Also can be used to attach wooden patterns to steel for tracing around with a plasma.

have fun
Tom