Advice on buying servos.

[Boyan Silyavski]

Yes, I think the 200W Omron drivers I've just bought will be too small, but will try them geared at 3:1. They were very cheap, so I'm not worried if I have to put them back on the market. I shall be keeping an eye out for 400W which is what they currently fit to the very slightly larger version of my machine.

Do you know what the ratio was on the Triac servos?

I am moving a 200kg gantry with 2x400w servos / via rotating nuts which have smaller inertia than spinning a screw / 3000 mms2 acceleration and judjing from the servo tuning and initial calculations, its the perfect thing. Exact sizing. geared 1.5, not 3. So with 200W servos geared 1.5 you could do a lot of things. No need to gear them up so if not needed. As gearing up will increase the spinning mass so maybe you will not benefit as you think ... 20/30 tooth is an ideal relation and pulley size. For lighter load you could go down as 16t but mind the servo shaft size. I would say for 200W servos, 18t pulley will be right, start thinking from there...

I am not sure also how Chinese servos stand up to brand servos. If 400w is 400w really? What i know is that the brand servos stand up to what they say. Thats why i preferred 230V AC servos , for all that benefits. If i buy a chinese servo i will always Up it one level of power so just to be sure. 750W isntead of 400