ATC for the Bridgeport mill

[cncdrive]

Hi Terry,

Yes, it looks very similar.

[Derek]

So you have a servo driving a gearbox driving a timing belt driving a ball screw.At least that's what it looks like. Was this for clearance or performance. Looks like a very clean solution. plus no air assist from what I can see.

[cncdrive]

Yes, it is how you described it. It was for clearance, I mean if it was possible to install it without the gearbox then we would do that, because the gearbox is costy, but the space is tighter there as it looks for first sight, especially because the table can move down making the space even smaller, so the 90° rotation of the motor was nessessary. And also a higher gear ratio was nessessary to have enough torque to move that heavy table than what was possible with a single timing belt gearing.

[andrewbishop66]

excellent picture says a thousand words
is that just an acme/trapezoid thread as the backlash would be eliminated by the table weight would be my thought

Thanks andrew

[cncdrive]

Andrew,

No, that is a ballscrew.
If I recall it is a 32x5mm ballscrew, so it has a high diameter compared to the pitch is why you can think it is an acme screw, but it is not, it is ballscrew.