New Project - Old Bed Mill Centroid Refit

[lwiseman89]

I have finally removed the current servos to find out what they are.

X and Y are both the SEM 29lb-in motors with 26/52 pulley reduction.

Z Axis is a braked Baldor (see attached pic) 40lb-in with 22/44 pulley reduction.

The head is counter weighted. Would i need to fit a braked ac servo replacement? My understanding is that the brake would only be applied in an estop or when the drives are un powered thus not having any effect when running a program or used for holding torque.

At this point i am leaning towards the stepper online 1kw ac servos mainly due to the shipping costs and that i can be some what confident in the quality.

I was thinking i may change the z axis ratio to 1/3 to increase torque, and make use of the higher rpm motor to bring the speeds back to whst they were. Existing rapid speeds were XY 3600mm/min and Z3000mm/min.

Does this seem sensible?

Thanks, Luke.

[cncsnw]

If the counterweight fully balances the head, then there is no compelling need for a holding brake in the servo motor.

Since you have the servo motor off, you should be able to twist the Z ballscrew pulley by hand and judge whether it takes continued torque to keep the head moving down, as well as to keep the head moving up. If it wants to keep going once you start it down, then a brake motor would be a good idea. Or more weight on the counterweight.

[lwiseman89]

Hi Guys, I am making slow progress with this project.
I have an Acorn, and I have a Stepperonline T6 1kw AC servo hooked up to it making it move. (https://www.omc-stepperonline.com/t6-se ... 0h2a3-m17s) FYI this a re badged Leadshine EL6 Drive.

I am starting to think about my Spindle Drive - Currently the mill has a 3 phase 400v 3.7kw induction motor. I only have single phase 230vac. I do have a rotary phase converter but I think its only rated to 2ish kW.

For those of you running a servo for the spindle, how do you think a 2.2-2.5 kw servo would go a spindle drive? Perhaps something like this (https://www.aliexpress.com/item/3305086 ... 68920%21sh)
I was thinking of running a 1:1 Ratio belt drive, and will be happy enough with the 3000ish rpm. Will this have enough torque to be useful? Other Mills i have used with 2.2kw AC induction motors seemed to have enough at their 1:1 speed. I will mostly be machining aluminium and plastics, but with a few steel jobs no doubt.

Feedback appreciated

Luke.

[suntravel]

This will work as a spindle motor.

Uwe

[Muzzer]

I am starting to think about my Spindle Drive - Currently the mill has a 3 phase 400v 3.7kw induction motor. I only have single phase 230vac. I do have a rotary phase converter but I think its only rated to 2ish kW.

Have you checked to see if the motor can be reconnected in delta as a 230V 3-phase?

[cad cam man]

This will work as a spindle motor.

Uwe

I dont mean to hijack this thread but I just bought the same t6 1000w servo from stepper online I have not received it yet but while waiting on the little brown truck I wanted to get all the documentation together. I can not find a wiring schematic on this make and model....where can I get a wiring/hookup schematic...

[suntravel]

Manuals for the servos:

https://www.omc-stepperonline.com/t6-se ... 0h2a3-m17s

But you must make your own wiring schematic for Acorn.

These T6 can not be used as spindle drive, they are position mode only.

Uwe