|Project by struuus||posted 01-19-2010 02:26 AM||3698 views||13 times favorited||24 comments|
I was asked to put a couple pictures of my CNC machine up. It’s a custom machine that I have not really used much, I have a tendency to enjoy the build more than actually using stuff (to my wives dismay). I plan to use it more once I resolve some of the issues..
This is my CNC machine I build a year ago. Built from scratch, used skate board bearings against aluminum angle track, very little slop. Threaded rod gives very high fidelity in linear action. The trade off is that the max jog speed is very low, almost unbearably slow. Motors are 24 volt steppers with (as I recall) 3600 step, I bought some stepper drivers. Pretty simple wiring, an I/O board takes strobes from the pc parallel port and converts them to direction and step signals to stepper motor drivers. I set it up to use a normal porter cable router. The software I bought is Mach3, which is a very cool software package for very little money.
Couple problems, that I still haven’t worked out. The first big problem is that that I have seen the steppers either over step or under step. I think its due to noise on the stepper driver/interface board. I rewired the box to help reduce cross talk. I also want to get a smaller router that generates less EMI, I think these 2 fixes should resolve my major problem. The next minor problem is that the limit switches false trigger, to the point that I disabled them. I tried filtering, shielding, and debouncing but that didn’t help. I think the reduced EMI router will help this.
-- Chris “The most overlooked advantage of owning a computer is that if they foul up there's no law against whacking them around a bit.” Eric Porterfield