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10-07-2020 #11
Based on your recommendations, I ordered the rails and carriages from Fred at BST - excellent communication, great pricing and quick turnaround. Time from payment to delivery was 8 days (paid Sunday evening, received Tuesday the following week).
I'm going to test bolt things together this weekend to measure up various bits and pieces and see how she slides. I'm going to get someone local to machine a few bits of aluminium for the extra bracing on the gantry. Do you guys lubricate the carriages before putting them into operation? They feel like they're a little 'dry' out of the box, but not sure if that's the ZA preload I'm feeling?
Now it's down to selecting the ballscrew for the X axis. Some folks on a Dutch forum suggested going for dual ball screw to prevent the gantry from racking. Gantry width is 800mm, and as mentioned I plan to mount a 2.2kw Teknomotor spindle. This machine was originally designed with steppers in mind. Will adding servos (with their potential for greater acceleration/rapids) make a duals screw with individual drive a more stable solution? If so, 2020 or 2010 for both, or downsize to 16mm screws?
Also, is there any significant upside to getting a C5 ground ballscrew (e.g. a TBI from Tuli) vs a C7 screw from Fred here?
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