Duet for an open source syringe pump
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Thanks that sounds good and it should work.
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Hello All,
I now have a DUET Wifi connected to 4 syringe pumps. However i am running into a snag. I need much lower minimum speeds.
I currently try to set the following maximum and minimum speeds according to: https://duet3d.dozuki.com/Wiki/Gcode#Section_M203_Set_maximum_feedrate
M203 X600.00 Y600.00 Z600.00 U600.00 V600.00 I0.01
but the machine keeps the default 30 mm/minI could increase the steps per mm 10 fold to make it steps per centimeter but i would like a more flexible solution.
Thanks in advance for your help.
With regards,
Eric Wieland
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Here is the complete axis configuration i am using:
; Axis and motor configuration
M569 P0 S0 ; physical drive 0 goes backwards
M569 P1 S0 ; physical drive 1 goes backwards
M569 P2 S0 ; physical drive 2 goes backwards
M569 P3 S0 ; physical drive 3 goes backwards
M569 P4 S0 ; physical drive 4 goes backwards
M584 X0 Y1 Z2 U3 V4 ; set drive mapping
M350 X256 Y256 Z256 U256 V256 I0 ; configure microstepping without interpolation
M92 X40960.00 Y40960.00 Z40960.00 U40960.00 V40960.00; set steps per mm
M566 X60.00 Y60.00 Z60.00 U60.00 V60.00 ; set maximum instantaneous speed changes (mm/min)
M203 X600.00 Y600.00 Z600.00 U600.00 V600.00 I0,01 ; set maximum speeds (mm/min)
M201 X900.00 Y900.00 Z900.00 U900.00 V900.00 ; set accelerations (mm/s^2)
M906 X700 Y700 Z700 U700 V700 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S1 ; Set idle timeout
M564 S0 H0 ; Allow movement without homing and outside the axis range
G91 ; Set to relative positioning;
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And i have an additional question. Is it possible to turn of the Pythagorean path length calculation for the speed? If i now move the x and y axis 10mm simultaneously the firmware precieves this as a move of ~14mm.
so a move G1 X10 Y10 F10 takes 1,4 minutes instead of 1 minute.For this project it would be great if that could be turned of. This is already the case for the u and the v axis.
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I think you may have to change the drive mapping from X and Y to say A and B?
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@Eric said in Duet for an open source syringe pump:
but the machine keeps the default 30 mm/min
you specify the feedrate along with the G1 command as an F parameter? or are you refering to the manual control in Duet Web Control or PanelDue, they have their own settings outside the firmware.
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I specify the feed rate with the G1 command however i cannot go lower than F30 as it is below the firmware minimum speed.
I currently want to use the M203 command to lower this minimum speed.
I use M203 X600.00 Y600.00 Z600.00 U600.00 V600.00 I0,01 to set max and minimum speeds.However the I parameter is not working as the minimum speed stays at 30 mm/min instead of going to 0,01mm/min.
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sorry, missed that you wrote F10 in the above post. there is a minimum speed, I think it was revised in either cnc or laser mode, maybe you'll find some refrences in the forum.
a possible workaround could be to change your steps/mm to effectively become steps/um and adjust the gcode accordingly?
(for that matter you could also set your steps/mm setting to steps/ml or steps/ul if it makes more sense, I'm assuming you're only controlling syringes and not any positioning of the syringes themselves?)
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Yea i already though about going to steps per micro or nano meter
I would however prefer to stay with mm.So if i switch to laser mode the M203 command might use the I parameter? i can try that.
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https://duet3d.dozuki.com/Wiki/Gcode#Section_G0_G1_Move
For CNC users especially: RRF has a default minimum movement speed of 0.5mm/sec. In firmware 2.03 and later this can be changed using the I ('i') parameter of the M203 command.
https://duet3d.dozuki.com/Wiki/Gcode#Section_M203_Set_maximum_feedrate
Innn Minimum overall movement speed (firmware 2.03 and later), default 30mm/min
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This does not work see my earlier post where i wrote:
I currently try to set the following maximum and minimum speeds according to: https://duet3d.dozuki.com/Wiki/Gcode#Section_M203_Set_maximum_feedrate
M203 X600.00 Y600.00 Z600.00 U600.00 V600.00 I0.01
but the machine keeps the default 30 mm/minI have firmware 2.03
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@Eric said in Duet for an open source syringe pump:
This does not work see my earlier post where i wrote:
I currently try to set the following maximum and minimum speeds according to: https://duet3d.dozuki.com/Wiki/Gcode#Section_M203_Set_maximum_feedrate
M203 X600.00 Y600.00 Z600.00 U600.00 V600.00 I0.01
but the machine keeps the default 30 mm/minI have firmware 2.03
Are you certain you have 2.03 release firmware installed, not a 2.03beta or 2.03RC version?
Have you tried 2.04?
