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  #91  
Old Sun 24 March 2013, 07:40
alan254
Just call me: Al #95
 
mystic ct
United States of America
Good morning,

I have read a lot on backlash and have no first hand experiance with it.

I was under the impression that I could program out the backlash with Mech 3. Is my thinking correct or not?

Or since I am in the just beging should I just pull the 36:1 gear box off the motor and go directly to timing belts in the same reduction range?

Al
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  #92  
Old Sun 24 March 2013, 07:55
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
You can use the backlash compensation built into Mach to remove it. What it does is rapidly move in the opposite direction the amount you tell it before moving the rest of the axes. It is a little nerve racking to watch and will add time to the program. It would be better in my opinion to shoot for zero backlash and move on from there. I have removed and modified the gearbox motors to work on a belt drive but this is not an easy task. I can be done by not easily. The motor shaft is ground with a spline to adapt to the gearbox. Stepper shafts are extremely hard. I had a choice of grinding the stepper shaft down to remove the spline or use the spline to cut or broach the aluminum pulley. I opted for the broach method and used Loctite 480 retaining compound. But to press the pulley on it has to be controlled and a special pressing block must be made to hold the stepper back side of the shaft from moving inside the motor so you do not damage it well applying the massive force it requires to seat the pulley.

If the motor is unopened and unused, you may be able to do an exchange. You could try it and see how back the backlash is and if you can live with it. Backlash is a funny thing, depending on what you are doing it my not affect you. Wood is forgiving that way as it moves greatly with small amounts of temperature and humidity.
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  #93  
Old Sun 24 March 2013, 07:56
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
Al,
Backlash sucks when it affects you, I can tell you that much.
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  #94  
Old Sun 24 March 2013, 08:48
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
This is 0.0098" Backlash
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  #95  
Old Sun 14 October 2018, 09:48
alan254
Just call me: Al #95
 
mystic ct
United States of America
Hi all it been almost 7 years since i finished building my machine and have had any problems with my machine till now.

The problem is my x drive motor it runs fine then it chatters and louses steps then it runs fine again. I have a new PK296A2A-SG7.2 motor and plan to replace it.

Many moons ago I read that if you are wired to half coil you are only using half of the motor and should there be a problem you can change to another winding. Am I correct and or was i dreaming. I have looked and can no longer find the thread i believed to have read.

Thanks Al
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  #96  
Old Sun 14 October 2018, 12:58
alan254
Just call me: Al #95
 
mystic ct
United States of America
Also if i jog it slow it is fine If I fast jog it acts up Checked all wiring it's fine . I also ordered a new 203v
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  #97  
Old Mon 15 October 2018, 12:33
alan254
Just call me: Al #95
 
mystic ct
United States of America
Found problem. One of the wires supplying the x drive in the wire e chain broke thru the insulation and was occasionally shorting to the outer shield of the cable. Replaced cable no problems in the first three hours of operation.
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  #98  
Old Wed 17 October 2018, 11:50
Robert M
Just call me: Robert
 
Lac-Brome, Qc
Canada
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Humm...interesting, what brand cable is it ( was it ?!)
Later
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  #99  
Old Thu 18 October 2018, 05:48
alan254
Just call me: Al #95
 
mystic ct
United States of America
This was used cable when i put it in. Now I changed all stepper wires with Southwire from Automation Direct Item code is MCTC-18-45-1
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  #100  
Old Fri 19 October 2018, 08:15
IamDave
Just call me: Davey
 
Ball Ground, GA
United States of America
The first time that happened to me, on my other router. I spent a few hours scratching my head. It is not an uncommon problem. Especially, if you use your machine.
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  #101  
Old Sun 21 October 2018, 06:54
alan254
Just call me: Al #95
 
mystic ct
United States of America
I gets used daily for almost 7 years now
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