Milltronics Partner 1E Allin1DC conversion

[dlenardu]

Started my Allin1Dc conversion last week. I made a new operator control panel and re-positioned it so that it would be easier to reach and see compared to the way the factory one was. Also made it with a swivel so it would rotate. In the new panel is a lenovo tiny computer and an ASUS 21.5" touch screen. I used the piece that I cut out for the monitor to come through as the keyboard mount.

operator panel

control panel swivel

new mount arms

I planned on using the factory DC rectifier and capacitors but when I checked the voltage I had 170V DC coming out and I have 140V motors. The factory rectified 120V which produced 170V DC but the Servo dynamic boards only sent out 100V to the motors. So I had to get another transformer to bring it down to 90V because the servo motors are 140V DC.

90V transformer

Had to bore out the center hole for the encoders

encoder hole

encoder

[dlenardu]

One issue that I am having is when I hit the Estop the Z head drops about 0.070" before the brake engages. Any idea how to fix this?

20230416_174357.mp4

Z drop

(11.57 MiB) Downloaded 8 times

Also when I did the backlash test, I set the indicator to Zero and commanded a -0.025 distance in each axis and then commanded it back to zero. When I commanded the -0.025 for both the X and the Y it would only travel -0.024 in X and -0.0235 in Y according to the indicator. When the command was to go back to zero it would go straight to zero every time.

report_0008DC111213-0310232930_2023-03-26_02-28-16.zip

report

(4.61 MiB) Downloaded 3 times

[converterking]

What toolchanger does your machine have?

[dlenardu]

What toolchanger does your machine have?

I do not have a tool changer on my machine. I wish I did, may have to build one someday if I can't find a good deal on a used one

[S-K Machine]

You could have left the factory rectifier circuit alone. My machine has the same 140 volt motors and the circuit puts out about 165 if I remember.
The allin1 will regulate it down. They never see much more than 100v even during rapid moves from what I remember when I checked it.
Remember, as amps go up voltage goes down.
As far as the backlash, go into the settings and add some backlash comp. I have mine cranked up pretty good. I looked all over the machine and could not find where it was missing from. First maybe thrust bearings then maybe loose pulleys .I just live with it. Does not seem to matter much.
20-25 year old machines are not spring chickens anymore and who knows how hard of lives they have had.

[converterking]

Milltronics used abec 3 angular bearings on the ballscrews. I always replaced them with abec 7 bearings which are about .100 thicker.
Where do you have the z axis brake connected? If I remember right Milltronics had it connected to the estop relay.

[S-K Machine]

Converterking, that how mine is connected to the contactor which is wired to the estop relay.
I saw no reason to change it even though the allin1 will do it using the output #9 I believe. Just more wiring to move around for no gain.
The head should have a counterweight on it anyway. The brake just holds it from creeping down on it's own.

[dlenardu]

@Converterking I have the Z brake wired to output 9 on the ALLin1DC.

@S-K Machine. The machine does not have a counterweight on it. Also, I was going to reuse the the factory setup for the DC servos but I was worried since Centroid says that you have to run the correct voltage to the motors and I didn't see anything about it limiting the voltage to the motors

[centroid467]

The ALLIN1DC does not limit the maximum voltage applied to the motors. It does vary the voltage with speed but that should not be relied on to stay within motor ratings. Best practice is to ensure supply voltage is equal to or less than motor's rated max voltage.

[dlenardu]

Added a little extra color to the front of the operator panel

Front panel

Still not sure what to do on my Z-brake issue