Nothing special, just a helix cut 3 flute, high aspect ratio that gets along with the balsa I cut. Works good on other hardwoods also, for engraving and inlay work. Obvioulsly work really great on birch ply...Harley wrote:Fat out - they are thin bits indeed. Are they special types/brands of bits?eac wrote:I use a 1/16" bit on my stuff,... Use 1/8" bit on 1/2" wood...
One last explanation of making a square inside corner with a round bit. The software does this but you can also do it manually. You guys are making it too complicated
on a normal inside corner, the bit goes into the corner, the goes at 90 degrees to the right to continue cutting. This leaves a rounded inside fillet at the radius of the bit. A square piece of wood can't go all the way onto the corner.
To correct this, when the bit hits the 'corner', and before it goes at 90 degrees to continue the cutting, it goes in to the corner at 45 degrees, just enough to get rid of the fillet, so a square piece can fit in properly. To do this, it has to go past the corner point, til the edge of the bit hits the point where it would be square, allowing the other piece to fit. It actually doesn't make the corner square, it makes it so square pieces can fit into the corner.
The new pic shows the actual cut in light blue, so you can see the 'overcut'... The dark blue line is the path of the bit.
Hope this explains it better.
Not sure when I will be able to get back to building, but everything has to be done, tested, and ready for the weekend of Sept 23rd. Busier than usual with kit orders right now, and kids & grand kids are visiting for labor day weekend, so the only time will be trying to sneak in a little build time a couple evenings til after the weekend.
Don @ EAC