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22-10-2013 #1
Ok so my cnc is generally great (for my very very simple needs!) but it does have 1 major failing that i would like to improve. The gantry is made up from 2 20mm round bars spanning approx. 7-800mm and it supporting a 1.5kW chinese spindle and associated mounts. You can imagine what happens - tons of flex/ruined parts - most noticeable when trying to cut sharp 90 deg turns from y to x, ends up with a lovely big curve if I go to fast!
Here is a rough diagram.
I also had a situation cutting a long thin pocket running down the x axis - all was going fine until suddenly the spindle seemed to flex down as if was trying to dig into the wood! I guess this was the flexing issue allowing this to happen...
So my question is how could I possibly improve my situation with minimum cost/rework?
Two ideas I thought of are:-
* upgrade the round rail to a larger diameter.
* change the round rail to supported round rail - I was thinking I could grid off part of the support at each end of the rail so it would fit in the existing holes?
Any ideas?
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