Z axis Ballscrew back drive concerns - CNC mill conversion

[johnsattuk]

Hi John
I haven't discounted this yet as I like the "assistance" it provides to the motor when lifting the table. Maybe I will end up with both strut and brake working to complement each other.
I am interested to know, in terms of £, what is relatively "cheap" in your mind? - based for example on the Vexta example you show. - what would you pay?
Andy

I do actually have strut and a brake servo on my mill for the same reason.

Cost of vexta steppers is very variable depending on how long you search for, very round figures £100 each, 5 phase, 500 steps, useful torque to 3000 rpm, direct 230v connection, I believe the steppers run at 162 v

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