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--- openbuilds_cnc_machine_2018 [2019/12/09 22:23] – [CAM Software] tell
+++ openbuilds_cnc_machine_2018 [2021/08/02 22:37] (current) – [Electronics] tell
@@ Line 5: / Line 5: @@
 Based on the C-Beam Machine kit from Openbuilds.com: https://openbuildspartstore.com/openbuilds-c-beam-machine/
+{{ cbeam-openbuilds.jpg?200 }}
 Steve and Jeff assembled it following the video on https://www.youtube.com/watch?v=HVR8pABCHXI
@@ Line 21: / Line 23: @@
 The interface board also has inputs that can be connected to limit and emergency-stop switches.
-There is no schematic that I've found for the interface board, but the signals are connected as follows, according to silkscreen text on the board:
+The interface uses the [[CNC Parallel Port Mapping | parallel "printer" port signals]] to control the stepper motors.
-^ DB25 connector pin      ^ PC Parallel Printer Port Signal      ^ CNC control function         ^
+The interface board is cabled to the parallel printer port on a PC.  The parallel port must either be on the motherboard or on a PCI expansion card; USB control is not possible (see the linuxCNC documentation).
-| 1                       |    C0                     |   unused     |
-| 2                       |    D0                     |   X step     |
-| 3                       |    D1                     |   X Direction  |
-| 4                       |    D2                     |   Y Step       |
-| 5                       |    D3                     |   Y Direction  |
-| 6                       |    D4                     |   Z Step      |
-| 7                       |    D5                     |   X Direction  (unused)    |
-| 8                       |    D6                     |   A Step      (unused)  |
-| 9                       |    D7                     |   A Direction   (unused)    |
-| 10                      |    S6                     |   E-stop     |
-| 11                      |    S7                     |   unused?      |
-| 12                      |    S5                     |   (X axis limit)      |
-| 13                      |    S4                     |   (Y axis limit)     |
-| 14                      |    C1                     |   Common motion enable  |
-| 15                      |    S3                     |   (Z axis limit)      |
-| 16                      |    C2                     |   B Step      |
-| 17                      |    C3                     |   B direction or Spindle Enable      |
-The interface board is cabled to the parallel printer port on a PC.  The parallel port must either be on the motherboard or on a PCI expansion card; USB control is not possible (see the linuxCNC documentation).
+====== First Motion ======
-If curious, more parallel port information is at https://en.wikipedia.org/wiki/Parallel_port
+The machine first moved its motors in June 2019: https://www.youtube.com/watch?v=QzRUWVw7nxc
+(This is from the motor test function in the linuxcnc setup program, which moves one motor back and forth at high speed.  The test is OK if the motion is smooth and repeatable)
 ====== Control Software ======