Machinists, Engineers, math wizards, I need a formula to do angle compensation of three angles with an offset.
The current project I am working on doesn't need to be super accurate, but I have a couple more projects coming up that will need the utmost in accuracy. So now is a good time to learn.
Right now I am designing a fixture to re-grind spade drill inserts, for another department.
Here is the part that will be held in the fixture I am making.
Que crappy sketch.
The cutting lip "must" make a true 90 lead in. To do this and have a lip relief, compensation must be used, I got that. But when the 5 deg cutting edge angle is introduced, combined with a .040 offset, everything goes to hell.
The red portions in the sketch are a radius to make a positive rake cutting edge. Not importaint right now, just helped make the crappy sketch easyer to read. Disreguard the 25deg angle and the 20deg back clearance.
Need a true 45deg lip.
The relief for the lip is 8deg
The cutting edge angle is 5deg.
The cutting edge offset is .040.
How do I figure the proper setting for a simple compound sine-plate?
I need the formula in its raw form and the same formula using the inputs listed above so I can understand better.