11-13-2012, 12:58 PM
for the price and durability you can't pass a rack and pinion.
speeds are easily adjusted (to an extent) by changing the pinion gear used.
Ballscrews would be great but to accomplish the speeds needed you risk the screw reaching it's critical rpm which produces lead whip. multi-start screws with a coarser lead can be used to avoid this. As mentioned though, plasma dust is an issue as it's so fine, it gets everywhere! a carefully designed layout can minimse the exposure to the dust but replacement screws (if) affected will be pricey.
I'm currently most of the way through a build at the moment with the table pretty much built and working on the drive mechanisms at the moment.
I'm using racks and 'V' rails for motion with steppers and belt reduction for the drive. I'll start a build here shortly once i snap a few more pics.
Should i place it here or in projects? it''ll be a while until completion with my minimal shed (shop) time lately but it's finally looking like a machine
speeds are easily adjusted (to an extent) by changing the pinion gear used.
Ballscrews would be great but to accomplish the speeds needed you risk the screw reaching it's critical rpm which produces lead whip. multi-start screws with a coarser lead can be used to avoid this. As mentioned though, plasma dust is an issue as it's so fine, it gets everywhere! a carefully designed layout can minimse the exposure to the dust but replacement screws (if) affected will be pricey.
I'm currently most of the way through a build at the moment with the table pretty much built and working on the drive mechanisms at the moment.
I'm using racks and 'V' rails for motion with steppers and belt reduction for the drive. I'll start a build here shortly once i snap a few more pics.
Should i place it here or in projects? it''ll be a while until completion with my minimal shed (shop) time lately but it's finally looking like a machine