Centroid Community CNC Support Forum

After making mistakes, I'm looking at switching from the stock BLDC motor that came on the PM-30MV over to an AC Servo motor. Purpose is to maintain about the same form factor and weight, but to gain an encoder and torque. I'm specifically looking at the A15 frame DHT 1.3kW NEMA 42 DMM servo with a DYN4 drive because I've already sunk a lot of research into DMM and am becoming more comfortable with it.

I searched the forum and watched several videos on YouTube (Marty, Rondeau, KVV), and that fills in most of the gaps, but had a couple of other questions...

Questions:
(1) Does anyone have specific experience with a DMM servo spindle motor on a PM-30 (not PM-25) with Acorn; if so, which servo model number? While I'm confident a 1.3kW will work (only slightly less rated power than the stock BLDC), there are two choices in that power rating: DHT and DST. I'd like to save a few bucks and get the DHT, but also am not sure if the DHT has enough torque (the DST is almost 50% more).
(a) Am I fooling myself and should go with the 1.8kW DST?

(2) Is the attached wiring diagram valid between the DYN4 and Acorn (specifically the P10 to JP5 pinout)?

I'm not stuck on DMM, just comfortable (now) -- open to other suggestions other than the no-name eBay option. Recognize that portion of this post isn't Acorn-peculiar.

I am in the middle of switching my stock motor over to a bldc servo on my pm-30
I dont know too much about DMM tho, i went with teknic SDHP servos on my axis

I can get you info on the pully sizes, what i did, and how i mounted everything.
I'm at work, but can get you info when i get home. feel free to DM as well

Edit:
I ended up going with a Delta Mod-tech 2.1hp 1.6KW 4200 rpm max servo
paired with a MPA-09-261 driver from MTS Systems
I will be using the virtual/ pass through encoder output from the driver for feedback
runs on 240vac 1ph

My servo was sized off of what would fit between the column and my Priest tool's power drawbar (also sized on what i had laying around lol)
I am re-using the belt and pullys. I got lucky and my servo has the same shaft size as the stock one, so it will be an almost drop in replacement. The mounting plate just had to be re-done because my frame size was bigger on the new one.

also note, the stock motor only goes up to 2k rpm and change and uses the pully ratio to get up to the 3k rpm
i can get you exact rpm and pully specs when i get home

If you not belt the servo 1:1 the encoder will not work for rigid tapping.

But anyway it is better to use an encoder direct belted to the spindle, than the one on the servo.

I use JMC servos on my hobby machines.

Uwe