pulley ratios on 3 pulley axis

[John S]

Ooops my bad didn't read EMC.

Note to self Read all the damn thread...........

[Swarfing]

Here is an example (not my config by the way)

[Jonathan]

It would be good if they let you set the derivative of acceleration ... that was going to be in the successor to mach3 which never happened. I wonder if EMC2 supports it.
Just out of interest what have you set the acceleration to?

[Swarfing]

only 30 at the mo, still lots of testing the limits as i am confident it runs in the first place. So far i'm pretty pleased with it though

[Jonathan]

30mm/s^2? That's very low ... I've got mine at 2000mm/s^2 on X-axis and it can do more. The moment of inertia of all those pulleys, particularly the 72T ones, will be quite high. That will of course limit the acceleration, but it probably won't be as high as my rotating a ballnut and pulleys.

I'm beginning to think though that high deceleration is actually bad as it causes the Z axis etc to flex very slightly (due to it's kinetic energy...) and 'overshoot'. Would be nice if you could set different values for acceleration and deceleration.

[Swarfing]

Note to myself - buy a laptop with a better keyboard, i type faster than it responds

[Swarfing]

my config is set up in metric, it is very straight forward to use

I think John you may have been too long on the dark side (Windoze euphoria)