If this is not a Cincinnati Milacron machine that RPM/volt setting probably does not apply as that was based on the Cincinnati's configuration.
We don't have enough info to know what yours should be so you should.contact the manufacturer to determinw what is correct for your machine. Even the gain suggested earlier doesn't necessarily apply to your machine.
Posting for help in the Cincinnati forum will by default get you suggestions that apply to Cincinnati's, which could make your machine worse if you blindly follow them. I still don't remember seeing what type of machine you have in this thread.
Well, 45 years ago I had a V3 Cintimatic NC (paper tape), does that count?
Originally Posted by maver1ck
I noticed that after I posted, but was hung up on the later post saying he does not have a Cincinnati.
I believe the OP (cncwar) does have a Cincinnati but I don't. However getting the gain signals synced up makes perfect sense for any DC servo machine. The procedure may be a bit different on my machine with SD drives, but the concept is still the same. I can hang a 4 channel scope on it and watch both axis as I adjust. I should have thought of this before, I do motion control for a living.
The info I gave was not for (JIM DAWSON) it was for (CNC WAR) with an A2100 control and the BDS4 is not a DC servo. The info I gave WAS based on experience with many machines of that type. It was meant to coincide with the setup information supplied by the OEM for that machine with that control using the BDS4 drives. I can send you the setup info if you need it. Jim, you are correct, we used a scope to setup the old DC drive many years ago but now with the A2100 control showing the gain, following error and many other servo related info on the servo setup screen we don't need to use a scope to setup a newer AC drive with the newer controls.
If you press DISPLAY on the A2100 front screen then SERVO SET and go to servo 2 (X) or servo 3 (Y) you can see the values and adjust the gain and balance of each servo to match. You should set each servo to 205.4 rpm/volt then adjust the COMMAND SCALE on the BDS4 to get a gain of 2.0 when moving the axis at any speed. This takes 2 people to make this adjustment, one to shout out the gain number and one to adjust the pot on the drive.
mike_Kilroy probably means the screen attached below. I knew this trick and of course adjust the gain so that following error was the same in both axis while runing at the same speed. In my opinion changing Kv adjust actually set gain- not only inform A2100 on what gain BSD actually works. As a confirmation i can tell You that if I changed Kv adjust the position error (following error) is changing. Any way it was set on my machine to get same parameters on all axes. It won't help. According to Your advice we are changed bearings on Y axes and now machine works within +- 0.014. I think without changing ballscrew OR/ AND nuts there is nothing i can do.
Do you have the setup sheets for your machine??? You should not be adjusting the Kv Adjust. It should be 1.0 and the Kv Nominal should be at 2.0 on most machines. I can send you the setup sheets. Keep the RPM/volt at 205.4 and adjust the scale pot on the BDS4 drive for a KV Active of 2.0 when moving the axis.
I would be very thankful if You are able to send me setup sheets. the only technical documentation i have is a schematics for my particular machine.
I'll try to set machine as You mentioned (Kv=2.0, Kv adjust = 1.0 and BSC scale pot so the Kv actual = 2.0) and give you feedback.
After settings up parameters as mentioned above the both axis start to wibrating a little bit ( Y axis shows bigger wibrations than X). For example when program is finished axis should stop but it takes up to 3 seconds to stop wibrating. And because of this the surface is not smooth.
Before i made changes Kv was like 1.2 (surface was also not good).