Hi all, I'm still somewhat floundering on my XY servo table. If you EVER think this group is OT, go to alt.machines.cnc, so...I ask here. At your advice I have specified servo motors for the job and have a few conundrums. In order to design a system I have to start somewhere but I have been reading. I know the 50 lb. table has to move 1" in X or Y in 3 to 4 tenths of a second. The table is on ball bushings and I plan on a 5/8" x 5 tpi ballscrews. Therefore the motors must accelerate from 0 to 1,300 rpm and decelerate back down to 0 in that time. I have run Parker Hannifin's "Motion Sizer" software to get a feel of what's needed. I do want it very simple and cost effective, but I want to reproduce the system on 4 more machines as budget allows. I've looked at and talked to the Rutex rep. about their drives and was recommended to use brushed motors as he wasn't comfortable with their brushless drives yet. I like the Rutex setup as it's modular and has IO and runs from a parallel port on a PC. He recommended #23 double stack or # 34 NEMA motors with about 15 in/lb torque with 250 line encoders. Parker's software shows somewhat less torque needed.
It seems that every vendor I've talked to didn't seem to grasp one part of this project or another and I felt uncomfortable. I know I'm not the best communicator in the world but...I don't want to blow my whole budget on a system that won't do it or is too complex or un-reproducible.
So, the motors need to be a good fit with the motion and mechanicals, the drives need to fit the motors, the PC needs to fit the drives the software needs to fit everything.
- Does it seem I'm on the right track?
- What comes first, the chicken or the egg...What do I specify first then build around?
- Is there any reason not to use brushed motors?
- Encoders, resolvers? Rutex only takes encoders; OK?
- Any thoughts about Rutex?
- Any thoughts about software to drill 9 rows of 12 holes getting a signal from the drill crank for the next move?
- Any sources for motors and power supplies and such?
- I do have a great source for ballscrews and they are 3 blocks away.
- Anybody have any of this stuff for sale?
( sorry abou the OT but I promice to cut a LOT of metal)