Cnc adventure Vol.1

[AndyUK]

Andy you used 2010 ballscrew,so do I in this stages,but did you consider 1610 and making it both sides fixed?Did anybody do that?Rotational mass would be significantly lower with 1610.��
Never went in calculating critical speed for 1610 in fixed fixed arrangement,but I will,just to see what would be results in comparison to 2010 ballscrew in fixed/supported arrangement.

I considered it, but went with the 2010 fixed supported as you say. From memory, the fixed-fixed didn't make that much difference to the critical speed (I'm too lazy to go re-calculate it now....). It also constrains the ballscrew mounting slightly more, and I didn't know if that would be a pain later on :)

You're correct it makes quite a big difference to the rotational inertia - but don't forget that the motor calculation spreadsheet has a factor of 3 as a safety margin. The implication is that I'm not overly concerned about that extra rotational inertia (because I'm quite confident my motors can cope with it to decent rapid speeds). That extra headroom on the critical speed means I should be able to push my motors further than initially calculated to find my max rapids without having to worry about whipping.