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Old 2nd January 2013, 02:05 AM   #1
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Default DIY Circle Jig

I made one before but can't find it so made a new one yesterday. It is pretty crude, but the original one worked well enough. Thought I'd share as it is pretty easy to make.

I Still need to test to work out if my measurements are correct, but it is easy enough to drill more dowel holes to get whatever size hole you need

Basically I just used a piece of Masonite, removed the plate off the router (and used as a template to mark the holes for the mounting screws (suitably countersunk).

I then attached it to the router and plunged very carefully with a countersink bit to get a pinhole at the dead centre of the router bit.

I then got my compass and (initally with pencil) scribed a 40mm diameter circle around that point. I also scribed lines through the centre of the circle.

I reattached the piece of masonite and plunged the bit I will use for cutting through the board (note I may need to plunge a bigger hole to allow for dust extraction), I can't remember if that was an issue last time).

Holes are then drilled in the board measured from the outside of the hole made by the router along one of the scribed lines. The distance between the two points being the radius of the hole to cut. Later if hole is enlarged, the distance between the 40mm scribed circle and the edge of the bit can be determined and offset added to get the correct distance.

I had a ~1/4" dowel handy which fits very snuggly in a 15/64th" hole.

I may get a chance to try it out this evening, and then if ok will route the cutout for the speaker I'm currently building.

Tony.
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Old 5th January 2013, 05:49 AM   #2
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and just to show that it does actually work here are a few pictures

The first one is after doing the rebate, + an initial cut to the same depth as the rebate for the inner hole. Others showing speaker fit and the final baffle sitting on the box (not yet actually glued together).

Tony.
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Old 18th July 2013, 10:42 PM   #3
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Hi Tony. Thanks for posting this, it is going to save me a heap of money purchasing a specialist jig
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Old 19th July 2013, 01:40 AM   #4
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No problem fringy I figure if I can make it myself why not!! I originally thought about getting a jasper jig, but by the time you added shipping it was going to be rather expensive!

Tony.
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Old 2nd August 2013, 01:20 PM   #5
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Quote:
Originally Posted by wintermute View Post
and just to show that it does actually work here are a few pictures

The first one is after doing the rebate, + an initial cut to the same depth as the rebate for the inner hole. Others showing speaker fit and the final baffle sitting on the box (not yet actually glued together).

Tony.
Which driver is it, one You have shown in image
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Old 2nd August 2013, 01:23 PM   #6
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It is an SB acoustics SB12MNRX25-4 more info here --> SB acoustics SB12MNRX25-4 "full range" Build thread

Tony.
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Old 10th August 2013, 01:13 PM   #7
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Nice photo..
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