Has anyone measured the linear force limits of the X50? I understand the X50 models use a 16mm pitch ballscrew which allows for better rapids and top cutting speeds at the expense of linear force(as compared to the 5mm pitch ball screw). Did the older machines (x35) use 10mm pitch screws?
Here are the leadscrew specs of each axis:
X-35 1610: 10mm
X-50 1616: 16mm
Z 1204: 4mm
The X-50 does also have a larger motor, I assume to cope with the pitch difference. Both have enough torque to snap a 1/4" endmill when you mess up if that helps 
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Thanks @Tuvix72. Yes my concern was the force reduction to speed gains due to the 16mm pitch but good to know about the actual force!
Is the Z axis really 12mm pitch? Your description says 1204 which is 4mm pitch
Yep, should read what I write before posting I will correct
My X35 axis has just under 0.001" variance in repeatability, I would say closer to 0.00075" when jogging to the same coordinates from opposite sides. I have an X50 on order so won’t know until that arrives, but I’ve never heard of any issues with repeatability.
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