Hi Meerkat,

Thanks - "beast" is the target after Dean' comments further back :-)

I made a little progress last night after putting a bracing structure and bearing onto the 2nd ballscrew extension - this has cut down flex considerably (i.e. hardly any movement even when leaning into it) and I did a test by jacking my motors up to 4000mm/min in MACH3 and had no stalling on full speed jogs. So a step in the right direction methinks. I'll likely push the speeds up again tonight and see where the stalling starts, but I'm quite happy with 4m/min, as in its original guise the machine wouldn't go above 2.5m/min reliably with the single ballscrew configuration.

To do tonight will be to put the belt tensioning pulley on and take the slack out of that (the bracing has improved that also anyway). Then run some more tests to see if there's been improvements.

I'll then think about plan b dependant on the results of that.

Chris