Backlash , Any suggestions ?

[philgiggins]

Hi,
Problem solved... I think. I have a breakout board which can be set ro different states with jumpers. I set it to special mode which was apparently for leadshine drivers. I changed it today to normal mode. I also changed the microsteps to 800 and retuned all my motors.
I then test cut a piece for a job im doing. I was able to up the feed rate to over 5m/min and i can now rapid at 12m/min.
So happy days! Thanks to everyone who replied.

Philip

[komatias]

Phillip,
Congratulations!

any chance of showing us your breakout board?

[philgiggins]

Thanks, here is a link to it http://www.sorotec.de/shop/CNC-Contr...anced-PRO.html . Its an Advanced PRO from Benezan electrics. I bought adaptors for the drivers also. This made wiring a lot easier.
Heres the options i had

• Stepper motors, no VFD speed control: 4-5, 7-8

Relay 1 controlled by LPT pin 1, no PWM, current reduction by pin 17, watchdog signal at pin 16


• Stepper motors with VFD and analogue output: 3-4, 5-6, 7-8


Relay 1 on if PWM>10%, PWM at pin 1, current reduction pin 17, watchdog pin 16


• Servo drives and VFD: 4-5. 6-7


Relay 1 at pin 1, PWM at pin 17, no current reduction, watchdog pin 16


• Special mode for Leadshine stepper drives: 4-5, 6-7, 10-11


Relay 1 at pin 1, PWM at pin 17, enable signal instead of current reduction, watchdog pin 16

I used the last one , now i am using the 2nd one.

Philip

[JAZZCNC]

Erm would be interesting to know what that "special Mode " does or why.? . . . I've checked the Manual and no mention of it other than settings.!

Never had any problems with Leadshine drives to be honest but I'm very fussy when it comes to BOB's so only use PMDX which are high quality or better still Cslabs controllers which don't have one.!

[philgiggins]

I dont know exactly what it does but i think i can explain why i was having the problem i was having. I was using cnc all day today and yesterday and the motors never got more than warm. Before this if i ran any sort of a long programme the motors where getting hot. This might explain why when i tried to go faster the motors overheated and then stalled causing the big steps in the cut i was getting ? So whatever the special mode does the drivers and motors dont like it, or they should be set as certain way. I might email Sorotec and see can they offer any information.

[JAZZCNC]

This might explain why when i tried to go faster the motors overheated and then stalled causing the big steps in the cut i was getting ? So whatever the special mode does the drivers and motors dont like it, or they should be set as certain way. I might email Sorotec and see can they offer any information.

No it won't be the Bob that caused the Motor heating this is a function of the drive and the settings you chose Current etc. The Special mode will be something to do with how it deals with Pulses going to the drives. Pulse stretching or buffering something like that, or possibly inverting the signals which is what I think it does. This setting will Def be the reason why you had missed steps but not Motor heating.!! . . . . I'm just curious to what it does given it doesn't say why.?