Differences

This shows you the differences between two versions of the page.

--- mcmaster:pr0ncnc [2016/07/22 03:58] – mcmaster
+++ mcmaster:pr0ncnc [2018/12/26 14:31] (current) – removed mcmaster
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-pr0ncnc is the standard platform that I use to build my CNC microscopes.  A typical system consists of:
-  * uvscada for high level control
-  * AmScope MU800 camera
-  * Driver box
-    * BBB running machinekit
-    * BBB cape w/ optional CD4050 3.3V => 5V boosters
-      * XYZ output standard
-    * Connected over USB w/ static USB-ethernet bridge IP
-    * Case: Hammond 1591-E
-  * IMS MDrive stepper motors (such as MDrive17 or MDrive23)
-  * Linear stages vary
-  * Step/direction connectors: Combicon 4 pin
-    * TODO: move to mini connectors
-  * Where applicable, bipolar motors use Combicon 5 pin
-  * Newport 39 mirror mount (tip tilt stage)
-BBB bolt pattern
-  * WARNING: not square.  According to breakout.py:
-    * 0.000, 0.000
-    * 0.000, 1.900
-    * 2.600, 0.125
-    * 2.600, 1.775
-  * For 4-40 standoffs into case
-  * Standoffs are CA glued in
-  * Standoffs should not peek out other side
-  * Consider putting Kapton on back in case they stick through slightly
-  * Need tight fit.  Drill size?
-====== Motor connector ======
-Although there is a de-facto DB25 standard for step/direction pulses (from Compumotor?), I don't like DB25 connectors.  Instead I use Combicon connectors since I can quickly wire them up and plug/unplug them.
-#29 drill for panel mount Combicon bolt holes using 6-32 SHCS
-Cable colors
-  * Step+: red (left)
-  * Step-: black
-  * Dir+: blue
-  * Dir-: white (right)
-====== BBB 5V cape ======
-Based on CRAMPS pinout
-{{mcmaster:brainscope:bbb_breakout_5v.png}}
-{{:mcmaster:pr0ncnc:cd4050bc.png?300|}}
-P8
-^  Pin ^  CPU GPIO ^  CNC function ^  I/O ^ Color ^ Note |
-|  12 |  gpio1[12] |  X dir  |O | White |  |
-|  13 |  gpio0[23] |  X step  |O | Blue |  |
-|  14 |  gpio0[26] |  Y dir  |O | White |  |
-|  15 |  gpio1[15] |  Y step  |O | Blue |  |
-|  18 |  gpio2[1] |  Z dir  |O |  | White |
-|  19 |  gpio0[22] |  Z step  |O | Blue |  |
-Colors
-  * Dir: white
-  * Step: blue
-I'd like to stick with 5 V CMOS style outputs since all my units can take those
-  * Traditional drivers are optocopulers and take resistor limited +/- 5V inputs
-  * MDrive17, MDrive23 basically 5-24V open drain but can also operate CMOS
-IMS MDrive probably don't take much current (TODO: verify)
-My Compumotor M-Drive requires 20 mA min
-  * CD4050 can typically only source 3 mA or so
-  * HEF4050 can do 20 mA max...borderline
-  * Sparkfun BOB-12009 theoretically can do 220 mA
-Originally I shied away from the BOB, but think I can simplify the soldering process to make it more attractive
-====== BBB pinout ======
-{{:mcmaster:pr0ncnc:p8_pinout.png?600|}}
-{{:mcmaster:pr0ncnc:p9_pinout.png?600|}}
-====== Camera calibration ======
-Put white piece of paper under camera
-Run manbal.py to get RGB values
-Adjust V4L controls until balanced
-Place V4L control values into microscope.json
-  * see example configs for specific usage