CNC Bridgeport retrofit

[legendboy]

Can you plot the commanded velocity in the drive? If you can, make a move in G code (just a straight line at a speed that causes the stick slip) and plot the commanded and actual velocity from the drive. The commanded velocity should ramp up, run for a while at a very even velocity (shouldn't look like stick slip), then ramp down. If it doesn't look like this, you have a problem in trajectory generation. That could be a few things, but do the test before worrying about what causes it.

I was thinking of asking Tero for a list of commands for the servo drives. There is a command line where his language can do tons more then what is available in the software gui. As of now i can't make just a straight line move. I have plotted velocity with step tests and it looks good.

Since getting the machines lube system running, adjusting table and saddle gibs and re tuning i have completely smooth motion.

[legendboy]

Spray WD-40 for cutting aluminum until you get some higher speeds. You can tell the cutter was gumming up, and it was also getting old chips under it every time the Z axis pick the cutter up and set it back down.

Over all, considering, it didn't sound to bad. A 1/2 end mill might give you a better test, and air blown at the cutter from a nozzle could help a lot also.


Jess

I'll post some more videos soon. I do have 2, 3/8" alum plates to cut for someone. Hoping to do them this week