todd_aust wrote:I'm interested if anyone has attempted to machine models like Russell's stool legs on a rotary axis machine. I have effectively a 4 axis machine so can run the x,y,z and a axis's simultaneously and have used the rotary to do some simple legs that have some square profile and some round (say similar to a column). Usually as I'm naturally lazy I do these with a completely unprepared (rough sawn) piece of timber and get the cnc to face the square sections (ie, pocket/surface, rotate 90 degrees - repeat 3 more times) and then do any of the rounded sections with the Y axis=0 and the A axis doing the 'work'.
This is fine for simple (round and square) type things (and even then requires manual g code editing of aspire output) however for what I'd call a complex shape (3d splined surface, where using all 4 axis at the same time would be an advantage) I'm at a loss on where to start. Has anyone done this sort of thing with manual hacking of aspire output or with modelling software exported into aspire?
I tried to unwrap the legs and do them on my 4th axis, but I couldn't get good enough accuracy. Maybe if I had more experience unwrapping. I find it faster to cut 4 legs at a time with my jig anyway (just over 20 minutes per side for 4).
Jim, I have a thread on CAMheads explaining my aluminum plenum system, but I could start a thread here if people want. It is VERY handy! I can place any of my jigs on there and it is perfectly positioned every time, and I can change it over in a couple seconds. I have a venturi vacuum source with a MAC valve connected to a pressure switch, so it turns on and off, maintaining pressure between 20-25"hg. Probably cycles on for 1-2 seconds every 10 seconds. I'm going to set up an old propane tank as a vacuum reserve so it won't cycle on and off as much.