|Forum topic by MisterCat||posted 06-08-2010 07:37 AM||4447 views||0 times favorited||10 replies|
06-08-2010 07:37 AM
A few months back I bought a small stock of 1/4”x20 flat head machine screws to be used for making shop jigs. When I was building a jig this weekend, I found out that I really didn’t have a good bit for countersinking the heads, everything was too narrow. Looking on the McMaster-Car web site, I found out that they had a 0.477 inch head diameter, which is larger than a #12 wood screw. I decided that my 1/2” 90 degree v-grove router bit would work in a pinch. It did, and pretty well. The difference in angle (the machine screws are 82 degree) didn’t seem to matter. I think that when the bolts are tightened, the wood fibers near the root of the machine screw get compressed and the angle of the hole changes till it fits the screw head slope.
So my question is: is there a big difference in the counter sink bits I see on Amazon? Some of the bits shown are ‘0 flute’ and have a sort of sharp edged hole
Some have just a couple of flutes
and some have many flutes:
Right now, my choice would be the many flute design, as I think it would be smoother cutting, and also be less likely to tear out. Does anyone have any experience with the different flavors?