Join Date: Dec 2012
Location: Santa Cruz California
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You want to use a "up spiral" bit, so that it removes the material from the cut. If you use a down spiral it will leave all the dust in the cut and make it wear faster, since you will recutting everything you already did.
A 1/4" bit will work fine for what you need. I've cut over 30 holes with mine and there is no signs of hear stress, burned cuts, or wear. It looks like it's new, and it's still as sharp as it was when I got it. I did my cuts in 3/4" MDF with three passes. Yes I could have done it in one, but I just cut a little at a time and I let the tool do the work, don't force it. Plus the jasper jig is set up for a 1/4" bit.
If your router doesn't line up with the jasper hole patterns, just drill your own holes. There is screws on your router base plate that you can use as a template.