Thread: My new 6040 improvement plan.
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16-12-2017 #41
Okay- some interesting results with dial gauge.
In middle of x axis (must be worst deflection zone), I can deflect the machine up or down a staggering 1.3mm! (worried).
I then thought- to prove the theory- deflection must be better or even minimal at either end of X-axis...
Its better, but still 1mm. So looks like its actually entire gantry flexing. Opens new possibilities.
Looking at Y-axis bearings, I previously closed the allen key sdjuster until it stopped, no further. I gave all 4 side screws a wee tweak tighter and deflection has been reduced to 0.4mm at ends and 1.1mm middle of Y axis.
I think theres another adjuster on top of bearing. I'll need to dismantle bed to get to it.
SIGH!
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16-12-2017 #42
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16-12-2017 #43
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16-12-2017 #44
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17-12-2017 #45
Regardless of what some people say I think you’re doing a grand job.
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The Following User Says Thank You to Kev2960 For This Useful Post:
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17-12-2017 #46
Thanks, mate. Appreciated.
I dismantled machine and nipped up all bolts. I tightened down all bearing adjustment screws (possibly to the point of uneccesary wear- who knows), but after that, the machine felt a whole lot more rigid! I didn't get a chance to measure anything as the wife forced me out into the real world to socialise. I'll measure tomorrow- but deffo better.
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17-12-2017 #47
Hi there, that’s interesting about the bearing adjuster screws. Can you tell me or send a photo. I might check mine, to be honest I didn’t even know there were any
Kev
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17-12-2017 #48
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17-12-2017 #49
Aren't those just grub screws holding the bearing cartridge in place? I don't see how those would do any adjusting on the bearings other than distorting the casing or possibly forcing things out of alignment slightly.
My first (well actually second, but first was tiny) CNC machine was a similar design... was good enough to get started with and do light work, but unfortunately you will never be able to address the flex you get on those unsupported rails without just getting rid of them.
Whether that's an issue depends on what the goals are... cutting foam or other very light duty stuff will never show a problem, harder woods or light aluminium work can be done but you have to really work within the limits of the machine and accept that the tolerances and finish may not be what you hope.Last edited by Zeeflyboy; 17-12-2017 at 06:34 PM.
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17-12-2017 #50
They’re probably just plain linear bearings and the screw just stops the bearing rotating or moving in it’s housing.
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