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CNC Machine Tools

CNC Machine Tools

CNC Machine Tools

(OP)
Can anyone tell me the grade of ball scews (C0-C7) used in precision 5-axis CNC machines giving 7-8 microns positional accuracy as per VDI/DGQ 3441?

RE: CNC Machine Tools

if not a rhetorical question, i believe your answer lies not in the screws, but in the backlash compensation and the x-y point compensations (in the exec file) for the machine.  these must be periodically checked and calibrated to maintain repeatability.

RE: CNC Machine Tools

Wow,
you have grabbed a tiger by the tail.  Your choice of ballscrew for a 5 axis is not a trivial thing.  Simple or compound attachment, drive system, repeatability required (there is a much ignored difference from accruacy here.) Speed, Force, lubrication possibilities, cycle life (how many million inches of travel), shock loading, serviceability.

Ballscrews Inc. is a name I remember from when I did such things.  Saginaw Gear also make them I think.  NSK, NTK, and other folks who make linear bearing way systems will either make ballscrews or have links.

Ingersol Machinery make an interesting screw - like an ACME, but with pressurized oil, so it acts like a sort of plain bearing - hell for strong and stiff, no stiction, big mess of recirculating oil.

nice new ball-nuts out there too, they have little pushers between the balls - acts like a cage in a ball bearing, and keeps the balls from scuffing on each other.

Don't forget that these things get warm and grow as you use them!!!

Good luck!

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