I've previously seen a guideline posted... by Jonathan I think... for the maximum length for a standard 16mm ballscrew assembly, after which whipping becomes a real problem, but I cannot find the posts.
Is 1500mm still ok-ish for a 1610 ballscrew?
The Following User Says Thank You to irving2008 For This Useful Post:
It depends how fast you need the machine to go. If you're happy with 6m/min, then as irving has said 1500mm is OK. If you need more you either have to use more bearings, use a higher pitch screw, increase the diameter of the screw, or rotate the nut. Which you choose depends on how much faster you need the axis to travel.
The Following User Says Thank You to Jonathan For This Useful Post:
"Fixity"... now that's a new term!
A-B-C-D-End Fixity - Nook Industries, Inc. gives "Fixity" definitions and based on these, my interpretation is that for example:
- Fixity-B is the same as using BK12 + BF12..... 16x1500mm = 6.88 m/min critical speed
- Fixity-C is the same as using BK12 + BK12..... 16x1500mm = 10.1 m/min critical speed
And if I want to use BK12 blocks at both ends to get the better speed potential, I need to ask Chai to machine both ends to take BK12 blocks?
Please "holler" if I've got this totally wrong... which as normal is a distinct possibility!
Last edited by WandrinAndy; 31-10-2012 at 11:10 PM. Reason: Changed m/sec to m/min!
I think you mean m/min not m/s!
On my X-axis I got both ends of the screw machined to match BK12 blocks, but for different reasons. I don't think this increased the price much if at all. It would probably help more if you went for custom end machining and blocks which increase the spacing of the bearings on the 'not fixed' end. Do you need more than 6m/min though? That's a fairly respectable speed, certainly plenty for cutting metals and most things efficiently.
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