Cutting Points with a 3/4 square router bit

[kiinstructor]

I am attempting to cut the grooves in my forearm with a cnc machine. I am using a 3/4 inch square router bit. I am having some success but one side is a bit shorter than the other. What Im doing is starting at the front of the forearm and cutting toward the back and cutting downward and inward with both the y and z. I have to make a few passes. Then I index it 90 degrees and do the same thing. They look pretty good except one side is a little shorter than the other. Is there an easier way to do this or do I have to keep trying different coordinants. Maybe I should just spring for a v-groove bit but I thought I could do I with a straight bit. The blanks seem to fit tight in the grooves but I think I have to fiddle around with the y and z to get it just right. Thanks for any suggestions.

Mark

 

[BLACKHEARTCUES]

I am attempting to cut the grooves in my forearm with a cnc machine. I am using a 3/4 inch square router bit. I am having some success but one side is a bit shorter than the other. What Im doing is starting at the front of the forearm and cutting toward the back and cutting downward and inward with both the y and z. I have to make a few passes. Then I index it 90 degrees and do the same thing. They look pretty good except one side is a little shorter than the other. Is there an easier way to do this or do I have to keep trying different coordinants. Maybe I should just spring for a v-groove bit but I thought I could do I with a straight bit. The blanks seem to fit tight in the grooves but I think I have to fiddle around with the y and z to get it just right. Thanks for any suggestions.

Mark

I taper my forearm & then while it is still in the lathe, I cut the "V" grooves, for the points. Taking the forearm blank out & then remounting it can result in an off center problem, that will make your points uneven. Use a dial indicator after mounting the forearm, to be sure it is spinning true...JER