I am trying to learn Mastercam X3 and get productive with it as quickly as I can. I was sort of thrown into this job last minute without warning and I need to get a couple of parts done asap I am starting with the most complex one.
See attached picture. Basically a rectangular piece of aluminum, with rounded ends. There is a shelf 1/8" down from the top, then there is a pocket 1/4" deep. Then there are three cut-outs (with 1/8" corner radii), 7 holes, and 2 "bosses" that stick up and get drilled/tapped. Then there are 5 pockets that are 0.050" deep.
I imported the part into X3 and set the work coordinate system to the top face as shown.
First problem is when I try to pick a facing operation and select the top surface, it says "facing does not support islands, use pocket facing". I dont understand why - I don't see any island? The bosses are 1/8" below the top surface, so why can't I do a facing operation on the whole top?
Second problem is when I try to create a pocketing operation, and I select the bottom of the cavity and select, say, a 1/4" flat end mill, the toolpath it creates only goes in the open areas where a 1/4" EM will fit... it doesn't do the whole bottom surface (even though it could pocket it all to that depth since the pockets that go straight through are obviously deeper than the bottom face). I want it to pocket the whole base to that level... then I wanted to make a 2nd pocketing operation to cut out the straight-through rectangles, then make a 3rd pocketing operation to cut the five 0.050" deep pockets. But it isn't working that way.
I did see a tutorial that talked about placing a temporary surface over holes to "cap" them so that a toolbit wouldn't try to go into them, but that's not happenning here... the toolbit is just avoiding the areas entirely.
I was able to get the pocket made with a "surface rough pocket" toolpath, but this has 2 problems... first, it does finish passes on each stepdown in the Z axis, whereas I would prefer to do a finish pass at the very end at full depth (and I dont see any option to change this). The second problem is that the three pockets that go straight through, it machines them down to the very bottom of the stock, but I don't need that... I will be machining the other side, and so I only need to go a hair over 1/8" below the bottom of the pocket (just break through a little) and with "surface rough pocket" I don't see any option to only pocket down to a specific depth, it seems to go all the way.
Any tips are greatly appreciated!