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Looking for Japser Circle Jig

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i made my own, cost me like $2 for a piece of acrylic, and different sized bits are no trouble, I just measure the radius of the hole from the outside of the bit to where i make my pivot point. I'm usually within 1/32 on my first shot. Close enough for government work.

http://home.comcast.net/~0fficeboy/shiva/photos/photo_9.html
here's a pic of my extender in action.
 
officeboy said:
i made my own, cost me like $2 for a piece of acrylic, and different sized bits are no trouble, I just measure the radius of the hole from the outside of the bit to where i make my pivot point. I'm usually within 1/32 on my first shot. Close enough for government work.

http://home.comcast.net/~0fficeboy/shiva/photos/photo_9.html
here's a pic of my extender in action.

Thanks,
Do you make new pivot point each time with different hole sizes or different bits?

Chris
 
Yeah, I just make a new pivot hole for each size speaker hole I have to make. I generally try to use the smallest bit I have for cutting, either the 1/4 or 3/8 just to keep the sawdust down.
Usually there is not that many different sized holes you need, so you can just keep reusing the pivot holes you have made.
Also for anything under 3.5" I just use a hole saw.
 
This is what I use now.
 

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