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  #1  
Old Sat 16 May 2009, 13:56
Gato Richy
Just call me: Richy
 
Chillán
Chile
Motors move too slowly - unresolved

Finally, I'm testing with Gcodes. First, a circule. I used the wizard for it.

But....the motion is real slow, I wonder how to speed up the gcode for testing. I used gcode long time ago, but I'm out of practice. I used F (for feed) and nothing seems to speed up, so I wonder if there is funtion in Mach3 to give more speed, I mean no jogging speed, because jogging is faster.

Thanks
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  #2  
Old Sun 17 May 2009, 17:52
PEU
Just call me: Pablo
 
Buenos Aires
Argentina
Gato, tune your motors in mach 3, then to move the axis, say with the cursors or the virtual pendant, press shift while moving, this will make mach3 to move at rapid speed instead of the dialed feedrate.

Si no se entiende te lo explico en español
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  #3  
Old Tue 19 May 2009, 15:00
Gato Richy
Just call me: Richy
 
Chillán
Chile
I would like to speed up testing trying to raise the the feed rate, by moving Mach3 feed rate, it does a little speed. But modifying Gcode I can't, is there a special funtion for it?
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  #4  
Old Tue 19 May 2009, 20:55
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
What is your jog speed? (The number in the Motor Tuning).

What does your g-code look like?
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  #5  
Old Wed 20 May 2009, 10:51
Gato Richy
Just call me: Richy
 
Chillán
Chile
Quote:
Originally Posted by Gerald D View Post
What is your jog speed? (The number in the Motor Tuning).

What does your g-code look like?
14.34/9000/500/0,05/1/0

Gcode
F400
G21
G00 Z10
G00 X249.4 Y200
G00 Z1
G01 Z-10 F2000
G02 X249.4 Y200 I-149.4 J0 F1000
G01 Z-11.9 F2000
G02 X249.4 Y200 I-149.4 J0 F1000
G00 Z10
G00 X249.5 Y200
G01 Z-11 F400
G01 Z-12 F400
G03 X249.5 Y200 I-149.5 J0 F1000
G00 Z10
G00 X100 Y200
M30

Thanks
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  #6  
Old Wed 20 May 2009, 11:10
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
The 14.34 in the motor tuning looks very low, but that is not the whole problem. (what gear will you put on your motors? how many teeth? what pitch/module?)

The fastest speed you have in the g-code is the F2000 for 2 of the z-moves. The fastest X/Y=move is at F1000. (the first XY-move is only at F400)

The F numbers are millimeters per minute. You have the MotorTuning/Jog speed set at 9000 mm per minute, but your g-code speeds for x&y are only 1000 mm per minute.
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  #7  
Old Wed 20 May 2009, 11:36
PEU
Just call me: Pablo
 
Buenos Aires
Argentina
The "Steps per" value is waay to low, as G. suggested, try putting there something like 1000. Then go to the settings screens and calibrate the axis using the "set steps per unit" button on the lower left side of the screen.
Tell mach to move the selected axis say 100 units (mm) and then measure how much it moved, enter this value and voila! axis is tuned.
You can do this again until you get pretty close to the value you entered, at somepoint it will ping-pong within two values.

Buena Suerte!
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  #8  
Old Wed 20 May 2009, 19:27
Gato Richy
Just call me: Richy
 
Chillán
Chile
Quote:
Originally Posted by Gerald D View Post
The 14.34 in the motor tuning looks very low, but that is not the whole problem. (what gear will you put on your motors? how many teeth? what pitch/module?)

The fastest speed you have in the g-code is the F2000 for 2 of the z-moves. The fastest X/Y=move is at F1000. (the first XY-move is only at F400)

The F numbers are millimeters per minute. You have the MotorTuning/Jog speed set at 9000 mm per minute, but your g-code speeds for x&y are only 1000 mm per minute.
14.34 is the math I found in other Thread. Gears are 35 teeth and 20 pitch. No reduction.

Thanks
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  #9  
Old Wed 20 May 2009, 19:31
Gato Richy
Just call me: Richy
 
Chillán
Chile
Quote:
Originally Posted by PEU View Post
The "Steps per" value is waay to low, as G. suggested, try putting there something like 1000. Then go to the settings screens and calibrate the axis using the "set steps per unit" button on the lower left side of the screen.
Tell mach to move the selected axis say 100 units (mm) and then measure how much it moved, enter this value and voila! axis is tuned.
You can do this again until you get pretty close to the value you entered, at somepoint it will ping-pong within two values.

Buena Suerte!
Hola Pablo, that value came up from the math. I may use a higher value but axis are calibrated to that value and higher may not be tuned properly. Any way I will try what you suggest.

Gracias Amigo
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  #10  
Old Wed 20 May 2009, 22:41
Kobus_Joubert
Just call me: Kobus #6
 
Riversdale Western Cape
South Africa
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I suggest using a longer distance for the calibration as per
Pablo in post #21. I was using this same method and then found that it was not 100% accurate on longer distances....so use this Mach3 tool, but calibrate it....go for about the max length and width that your table can go
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  #11  
Old Wed 20 May 2009, 23:04
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Okay, your maths is correct. (35tooth is too big for a direct drive motor if you want to cut wood. It may be okay for very soft material)

Try the following G-code:

F5000
G21
G00 Z10
G00 X249.4 Y200
G00 Z1
G01 Z-10 F5000
G02 X249.4 Y200 I-149.4 J0 F5000
G01 Z-11.9 F5000
G02 X249.4 Y200 I-149.4 J0 F5000
G00 Z10
G00 X249.5 Y200
G01 Z-11 F5000
G01 Z-12 F5000
G03 X249.5 Y200 I-149.5 J0 F5000
G00 Z10
G00 X100 Y200
M30
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