Circle jig for routers
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Circle jig for routers that have 2.4 inches between centers on the mounting holes.
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- Creative Commons — Attribution — Noncommercial
If you have a router that has a 2.4 inch span between the mounting bolts, this circle jig should fit and allow you to cut the most standard size openings for woofers.
The jig is set to cut 6 - 21 inch circles. The selectable dimension openings are designed for a standard #8 wood screw. The 6 inch openings are all labeled. The 7 - 21 inch openings function dimensionally the same as the 6 inch.
The cut dimensions are based on a ¼ diameter router bit. If you use smaller bit your overall hole size will be reduced by the difference between a ¼ inch bit and the bit you are using. If you use a larger diameter bit your hole size will increase in size the difference between the bit you are using and the ¼ inch bit.