Maximum length guideline for a standard 16mm ballscrew?

[WandrinAndy]

"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!

[Jonathan]

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.

[WandrinAndy]

Do you need more than 6m/min though? That's a fairly respectable speed, certainly plenty for cutting metals and most things efficiently.

My difficulty was not knowing what speed I need and whether that was a fairly respectable speed or not... But you've clarified that now... Lol.

I will go for the extra BK12 and BK12 end machining anyway.

Btw, I have edited m/sec to m/min... Thanks!