Router Bits and Circular Saw blades

[wasted ink 10+ year member]

You can use either.

 

[Mike465 10+ year member]

Does a Jasper Jig require a 1/4" shank or will a 1/2" shank with a 1/4" cutting diameter work? Also what bit do you guys use to flush mount speakers?

The jig is calibrated using a 1/4" bit but shank size does not matter.

 

[BrianChia 10+ year member]

Does a Jasper Jig require a 1/4" shank or will a 1/2" shank with a 1/4" cutting diameter work? Also what bit do you guys use to flush mount speakers?

Jasper Jig can use any size shank/cutting diameter. The measurements are calibrated for 1/4" but it's easy to add or subtract to convert different size bits.

I use a 1/4" spiral upcut bit for cutting standard circles (the spiral is a little better than the standard fluted straight cut bit). For subs, most people just use a double baffle arrangement where the outer baffle is cut to the basket diameter and the inner is cut to the mounting diameter. The outer baffle provides the flush mount (it's usually not going to be perfectly flush but will be close enough).

For true flush mounting (usually for smaller home audio speakers) I use a 3/4" mortising bit.