Home Built CNC

[Jala2]

Hi Jazz,
Since the upgrade to the NEMA 23 motors, I have started to get one of my Axis dropping steps, I think I have traced the problem to lack of power from my Power supply.
When I made the change I did not change the settings on the Drivers, the old NEMA17 motors where 2.5 Amp and the new ones were 2.8Amp so rather than messing with the drivers I left them at 2.5 Amp. I then started to do stuff on the CNC and noticed that the X Axis which is slaved to A was dropping steps. Checked the Tightness of couplings etc. but could not find a fault. Decided, as I had the machine apart, to change Drivers to 2.8Amp. This has now resulted in X & Y Axis dropping steps. Aha I thought not enough power, I only had a 10Amp power supply. I have bought a new 25Amp Power supply and I am now waiting for its delivery tomorrow. Hopefully this ill have resolved this issue. But really, the thing is I'm retired and building this on my own without a contact to bounce problems off and was looking for such a person, someone who would not mind giving some advise when required.

[JAZZCNC]

Ok well, the difference in amps wouldn't really cause any issues and to be honest the increase wouldn't probably either with a 10amp supply. So I've got a few more questions.

What type of PSU were you using and what voltage.? ie: Toridal or linear PSU, regulated or unregulated, and how many motors pulling from them 3 or 4.

How are the motors wired, parallel, or series and what Drives are you using.? If you have the motor datasheet post it.

What Control software and did you re-tune for the new motors.?

One of the main problems could be the motor spec, if it's a cheaper motor then the inductance will most likely be very high meaning you'll require a much higher voltage to get the same speed as the much smaller and lower inductance Nema 17.
If this is the case then I suspect your problem is more lack of volts than Amps and your speed/torque curve is much lower. This is the problem with upgrading, if the system isn't balanced then you can actually make the machine worse, not better.

I'm happy to help and give advice on the forum, or if you prefer I'm also happy to speak on the phone, it's often much easier and quicker to help fix problems so just drop me a PM and I'll send you my numbers.