Added steel channel to X-axis c-beam

[routercnc]

Hi Tyler,


I took your google data sheet and used the deflection which I believe is closest to the collet to calculate the stiffness. It is around 1125 N/mm where you took that measurement (router plate Y direction). This would be lower at the collet itself which is really the only value that matters.


A few of us have done something similar. Here is my thread showing my 'old' machine:
http://www.mycncuk.com/threads/7155-...ss+measurement

Stiffness was:
X 1250 N/mm (the long axis)
Y 1000 N/mm (across the gantry)
Z 2450 N/mm (vertical)

These are not that high but the machine worked OK. Measurements were taken with spindle centred on the gantry (i.e. mid-span), and the spindle Z 50mm down from the home position (i.e. a notional cutting position). Force was applied on the collet nut (in X, Y, and Z directions), so does not include the stiffness of the cutting tool. Others have made stiffer machines than this, see post.


If you want to compare basic section properties (C-beam is poor in torsion), here is my calculator:
http://www.mycncuk.com/threads/2214-...ess-calculator