[evilr1]

choosing stepper motor Size for my Table

am runnig 2 THK BLR2525 ballscrew on the x axis
with hiwin 45 rail and two blokc on either side and the weight it will be carrying nearly 300kilogram

on they Y axis a THK BNFN 3206 double nut ballscrew with four hiwin 25 rail and 8 block weight carrying will be 150kilograms

z axis a ballscrew THK BTK4010 with 5 rails of NSK 15 12 Blocks eight carrying will be 50kilo mark

so please any help or advice of what size stepper motor to choose would be appreciated i was adviced on a guess to go with nema 34 1800-ozin

[awerby]

With loads like the ones you're talking about, it sounds like you're in servo territory.

Andrew Werby
ComputerSculpture.com — Home Page for Discount Hardware & Software

[evilr1]

how hard would it be ot set up a servo system

[awerby]

If you go with a step/direction CNC control software like Mach3, brushed DC servo motors with rotary encoders, and drives like the Gecko 320s, it's not a lot more complicated than setting up steppers. This doesn't get you as sophisticated a system as something that closes the servo loop in software (for that you need EMC or the equivalent, which is more complicated to set up) but it will work, and you'll be able to take advantage of the higher speed of the servo motors (as compared with steppers) to gear them down and get more torque without slowing your axes too much. If you're running long cables, though, you might want to add differential transmission/reception circuits to the encoders, to keep them from being affected by noise.

Andrew Werby
ComputerSculpture.com — Home Page for Discount Hardware & Software

[evilr1]

like using solidcam or mastercam for solid works