https://github.com/njh/linuxcnc-cncdudez-2012
LinuxCNC configuration for the CNCDudez 2012 Desktop Mini Muscle CNC Machine
https://github.com/njh/linuxcnc-cncdudez-2012
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LinuxCNC configuration for the CNCDudez 2012 Desktop Mini Muscle CNC Machine
- Host: GitHub
- URL: https://github.com/njh/linuxcnc-cncdudez-2012
- Owner: njh
- Created: 2014-01-03T18:34:11.000Z (over 12 years ago)
- Default Branch: main
- Last Pushed: 2021-07-29T17:10:08.000Z (almost 5 years ago)
- Last Synced: 2025-09-02T03:44:15.075Z (9 months ago)
- Topics: linuxcnc
- Size: 10.8 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
linuxcnc-cncdudez-2012
======================
LinuxCNC configuration for the CNCDudez 2012 Desktop Mini Muscle CNC Machine
The machine is very similar to the "Mini Muscle MK2 Routing Machine" that CNC Design Ltd now sell:
http://www.ukcnc.net/index.php/products/mini-muscle-mk2-routing-machine/
But I bought "Option 1" which only included the aluminium frame.
I bought and built the electronics seperately myself.
CW5045 Microstepping Drivers
----------------------------
http://www.ukcnc.info/forums/showthread.php?1202-Stepper-motor-heat-sinks
> Even though the motors we use on the CNC Mini Muscle Machine are rated
> at 4.2 amps I set the driver at around 3.7 amps to play safe. So even
> going slow speeds where the current is at it's peek then they should
> still not get to boiling point as such.
Configuration for the microsteping driver:
| DIP Switch | Setting | Meaning |
|------------|---------|---------------|
| SW1 | Off | 3.7 Amps |
| SW2 | **On** | 3.7 Amps |
| SW3 | Off | 3.7 Amps |
| SW4 | **On** | Full Current |
| SW5 | Off | 10 microsteps |
| SW6 | Off | 10 microsteps |
| SW7 | **On** | 10 microsteps |
| SW8 | **On** | 10 microsteps |
More information in the datasheet:
http://cnc4you.co.uk/resources/CW5045.pdf
Timing settings:
| Setting | Value |
|----------------------|-------------|
| **Step Time** | 2000 ns |
| **Step Space** | 8000 ns |
| **Direction Hold** | 5000 ns |
| **Direction Setup** | 5000 ns |
| **Steps on** | Rising Edge |
More here: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?CW5045
Parallel Port configuration
---------------------------
I am using a HG08 Parallel Port 'breakout board':
http://www.cnc4you.co.uk/index.php?route=product/product&product_id=300
All pins are inverted.
| Pin | Direction | Breakout Label | Linux CNC Description |
|-----|-----------|----------------|-----------------------|
| 1 | Out | EN | ESTOP Out |
| 2 | Out | CKA | X-Axis Step |
| 3 | Out | CWA | X-Axis Direction |
| 4 | Out | CKB | Y-Axis Step |
| 5 | Out | CWB | Y-Axis Direction |
| 6 | Out | CKC | Z-Axis Step |
| 7 | Out | CWC | Z-Axis Direction |
| 8 | Out | CKD | Unused |
| 9 | Out | CWD | Unused |
| 10 | In | IN4 | ESTOP In |
| 11 | In | IN3 | Both Limit + Home X |
| 12 | In | IN2 | Both Limit + Home Y |
| 13 | In | IN1 | Both Limit + Home Z |
| 14 | Out | RLY | Spindle On |
| 15 | In | IN5 | Probe In |
Parallet Port breakout board datasheet here:
https://github.com/njh/linuxcnc-cncdudez-2012/raw/master/docs/HG08.pdf
Stepper Motor Wiring
--------------------
I am using 57HS82-3008B 2.2Nm Stepper Motors, wired in Bi-polar parallel mode.
They are connected to the control box using 4-pin XLRs.
| XLR Pin | Description | Cable Colour | Stepper Motor colour |
|---------|-------------|--------------|----------------------|
| 1 | A+ | White | Red + Blue |
| 2 | A- | Yellow | Yellow + Black |
| 3 | B+ | Brown | White + Brown |
| 4 | B- | Green | Orange + Green |
Stepper motor datasheet here:
https://github.com/njh/linuxcnc-cncdudez-2012/raw/master/docs/57HS82-3008B.pdf
Input Connector Wiring
----------------------
| Mini XLR Pin | Description | Cable Colour |
|--------------|--------------|--------------|
| 1 | Shield | Shield |
| 2 | +5v | Red |
| 3 | Input Signal | Black |
**Do not use Pin 1 / Shield as ground / 0v**
Note that the pin-out of a mini XLR is slightly different to a normal XLR.
Timings and Velocity
--------------------
The PC I am using has a [D945GSEJT] motherboard with a Intel Atom N270 CPU @ 1.60GHz.
Sadly I have had some trouble with high Jitter in the latency tests - this mainly seems
to occur when doing other operations, such as transferring files and waking from sleep.
| | Max Interval (ns) | Max Jitter (ns) |
|-----------------------|-------------------|-----------------|
| Server Thread (1.0ms) | 1067369 | 76089 |
| Base thread (25.0us) | 61272 | 36490 |
While I could achieve some quite high velocities, without loosing steps,
during testing using [Stepconf], I experienced problems with stalling which using the main
LinuxCNC interface. I have therefore decided to set my __Base Period Maximum Jitter__
value to **40,000 ns**.
I am also limiting the maximum velocity to **1800 mm/min** (30 mm/sec).
While testing the acceleration, I was unable to find a value that caused problems, so I
have set all axes to **500 mm/s2** for now.
I suspect that it may be possible to have a much higher value - I'm not sure
how this would affect cutting times.
Other Notes
-----------
* Steps per revolution: 200
* Driver Micro-stepping: 10
* Pully Teeth (Z axis): 1.0 : 1.0
* Ballscrew Pitch: 4mm per revolution
[D945GSEJT]: http://www.intel.co.uk/content/www/uk/en/motherboards/desktop-motherboards/desktop-board-d945gsejt.html
[Stepconf]: http://www.linuxcnc.org/docs/html/config/stepconf.html