RepRap: Blog

 The GRBL stepper setup is as follows:

CNCjs 1.10.3 [Grbl]
Connected to /dev/ttyACM0 with a baud rate of 115200
Grbl 1.1g ['$' for help]
client> $$
[MSG:'$H'|'$X' to unlock]
$0=10 (Step pulse time, microseconds)
$1=255 (Step idle delay, milliseconds)
$2=4 (Step pulse invert, mask)
$3=3 (Step direction invert, mask)
$4=0 (Invert step enable pin, boolean)
$5=0 (Invert limit pins, boolean)
$6=0 (Invert probe pin, boolean)
$10=17 (Status report options, mask)
$11=0.100 (Junction deviation, millimeters)
$12=0.200 (Arc tolerance, millimeters)
$13=0 (Report in inches, boolean)
$20=0 (Soft limits enable, boolean)
$21=1 (Hard limits enable, boolean)
$22=1 (Homing cycle enable, boolean)
$23=3 (Homing direction invert, mask)
$24=5000.000 (Homing locate feed rate, mm/min)
$25=8000.000 (Homing search seek rate, mm/min)
$26=10 (Homing switch debounce delay, milliseconds)
$27=1000.000 (Homing switch pull-off distance, millimeters)
$30=1000 (Maximum spindle speed, RPM)
$31=0 (Minimum spindle speed, RPM)
$32=0 (Laser-mode enable, boolean)
$100=31.000 (X-axis travel resolution, step/mm)
$101=33.642 (Y-axis travel resolution, step/mm)
$102=32.000 (Z-axis travel resolution, step/mm)
$110=15000.000 (X-axis maximum rate, mm/min)
$111=15000.000 (Y-axis maximum rate, mm/min)
$112=15000.000 (Z-axis maximum rate, mm/min)
$120=200.000 (X-axis acceleration, mm/sec^2)
$121=200.000 (Y-axis acceleration, mm/sec^2)
$122=900.000 (Z-axis acceleration, mm/sec^2)
$130=6500.000 (X-axis maximum travel, millimeters)
$131=6500.000 (Y-axis maximum travel, millimeters)
$132=6500.000 (Z-axis maximum travel, millimeters)
ok

# posted by vik-olliver @ 1:34 AM 0 comments

Paul asked if NEMA14 steppers could be used in a μRepRap. Well, I guess. 80:1 mechanical advantage will do a lot if your motor hasn't got much torque. So I've split the PIKA version of the Axis Driver away from the MAUS version, tidied it a bit, and made the screw holes into slots that should take NEMA14 or NEMA17:

The motor shaft and boss are (I think) the same size on both, and the slots should self-centre the motor. As this is gloriously untested there are no STLs, but you can download and build from here

https://github.com/VikOlliver/RepRapMicron/blob/main/pika/pika_axis_driver.scad

Let me know how it goes. 

# posted by vik-olliver @ 9:38 AM 0 comments

The guide to automated etching of RepRapMicron Probe Tips and their integration/assembly is now on the Github wiki: 

https://github.com/VikOlliver/RepRapMicron/wiki/Probe-Tip-Fabrication-And-Assembly

Comments and suggestions welcome.

# posted by vik-olliver @ 1:26 AM 0 comments

I have now posted the results of FPath Experiment 012 which is part of the FPath project. 

Experiment 012 builds on the Graphical Stigmergy control techniques discussed in earlier experiments and embeds commands into the virtual path. These commands can automatically trigger actuators when the device under control traverses that section of the path.

Also, which may be of some interest, is a brief discussion of a new Subsumption Architecture which has been implemented in the controlling software. It has proven to be quite versatile in operation.

I just thought that some of you might be interested in how all this is done. The video explains all: https://youtu.be/7SanmrL5zJI

Labels: FPath, Graphical Stigmergy, Image Recognition, Sub-millimeter Control, Subsumption Control Architecture

# posted by OfItselfSo @ 1:09 PM 0 comments

If you want a preview, here's a link to the Probe making documentation:

https://github.com/VikOlliver/RepRapMicron/wiki/Probe-Tip-Fabrication-And-Assembly

I've only covered the etching part so far, but I'll write proper docs for putting the etched tip on the Probe Arm later.

As an aside, I tried using the automated probe dipping with a variety of over- and under-etch roughened wires (by time and acid strength) and they generally end up with pretty much the same shape on the last 100μm:

As far as I can tell at this point, the upper profile is preferred.
 

# posted by vik-olliver @ 7:58 AM 0 comments