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05-01-2023 #1
For a 400x400 machine, 1605 screws would be good enough.
They do limit top speed compared with 10mm pitch screws, but at 400mm max travel distance, that's not really a major issue.
As for rail size, 20 size is actually overkill for most machines, but the larger mounting screws let you get away with simply bolting them down, and the higher height often helps with component positioning.
In terms of actual forces the rails need to handle, you could probably drop to 10mm rails and still have a perfectly good machine, but they'd need to be mounted as per the official recommendations, with the rails clamped into position against a reference edge, and not simply bolted down.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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09-01-2023 #2
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10-01-2023 #3
I believe that you need to fill in the forms in triplicate and make formal application to Hiwin before fitting any of their profile rails...
More seriously, I can remember finding a copy of the Hiwin manual giving their recommendations for fitting and setting up their profile rails when I built my router. As M_c says, 20mm rails are intrinsically stiffer so easier to mount, and particularly for the Z axis the increased height over smaller rails makes it easier to fit in the ballnut, etc, between the Z fixed and moving plates.
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