Losing steps/position, again

[ngwagwa]

Cheers,

No vac on and tested today without power to VFD so I think I can rule that out.

As it is losing steps in all directions (though X is most noticable) I am tempted to also rule out mechanical binding?

I will look at the velocity and acceleration tomorrow and post settings/results.

[JAZZCNC]

As it is losing steps in all directions (though X is most noticable) I am tempted to also rule out mechanical binding?

It would be a mistake not to check it out.

What machine is it again.?

[ngwagwa]

Denford Microrouter.

Last time it was faulty I did clean all the nuts but it was only when I fitted a new BOB that it stopped knocking and losing steps.

I have just been over to the workshop and regarding the velocity and acceleration settings X and Y were set at 3000 and 150. When first turned on (lo and behold) the machine jogged several times along X with no knocking. Set them to V=1000 and A=50 was knocking when jogged, Also tried 500 and 20 still knocking.

[ngwagwa]

[QUOTE=JAZZCNC;115603]It would be a mistake not to check it out.

BINGO and thanks to JAZZCNC. Disconnected the drives nuts and jogged for about 10 minutes with no knocking noises, gave them a liberal spray of silicone lubricant, reassembled and all seems sweet.

So, is it possible to replace the stepper motor with one with a bit more gut? I can't see any markings on the current ones.

[JAZZCNC]

[QUOTE=ngwagwa;115630]

It would be a mistake not to check it out.

BINGO and thanks to JAZZCNC. Disconnected the drives nuts and jogged for about 10 minutes with no knocking noises, gave them a liberal spray of silicone lubricant, reassembled and all seems sweet.

So, is it possible to replace the stepper motor with one with a bit more gut? I can't see any markings on the current ones.

Great glad your sorted.

Regards changing the steppers then often with these machnes if using original boards then it's not the steppers that are weak it's the fact they are run with low voltage drives, usualy between 30-40Vdc depending on model. Changing the steppers alone won't make any difference because the drives and voltage are the weak link.

Are you using the original drives etc that came with the machine.?

[ngwagwa]

Hi, The control box is a right jungle but as far as I can see the original drivers are used for X,Y&Z and there is an additional HY-DIV268N-5A for the 4th AXIS. As I am not using the 4th axis could I try using that driver?

[JAZZCNC]

Hi, The control box is a right jungle but as far as I can see the original drivers are used for X,Y&Z and there is an additional HY-DIV268N-5A for the 4th AXIS. As I am not using the 4th axis could I try using that driver?

Won't make much difference if you haven't got the volts to go with it. Volts are what give steppers there speed.

To be honest without knowing more about what's inside I'm relutant to advise any more and suggest until you know exactly what you have and the voltages you have that you don't go messing about because it's very easy to kill these boards.

Based on expereince of these machines I think you'll find the only way to get them to go faster and be reliable is a full retro-fit with new drives, psu and motion controller the motors you can usually keep. When this is done it transforms the machine to another level, but it costs money.

[ngwagwa]

Am I correct that a retro-fit would mean a new motion cotroller, PSU and 3 new drivers and if this is the case could I (for the time being) just use a new driver on the X Axis and use two HY-DIV268N-5A drivers for Y and Z?