Shopbot Desktop converted to LinuxCNC

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26 Jul 2016 03:55 - 26 Jul 2016 04:07 #78029 by jut
Here's out Shopbot Desktop that was converted to Linuxcnc control. We decided to do a conversion because the oem software is buggy and lacking in performance and features compared to Linuxcnc.

Some key differences after upgrade:
1. more reliable communication between motion controller (LinuxCNC) and the machine
2. ability to control spindle with native Gcode commands via RS485
3. better homing and software limits on each axis + tool height setter
4. better compatibility with CAM gcode output
5. faster/smoother stepper pulse control due to Mesa 5i25 pci card
6. ability to extended the cnc machines abilities, like controlling a spot welder or pick and place machine.

Sorry to the linux purist, but the computer is running a win7 virtual machine for CAD/CAM in Autodesk Inventor. I've actually done CAD/CAM work while the cnc machine is making chips, mainly due to the fact that the Mesa card offloads the step generation burden.

Picture album: imgur.com/a/Eij2S





Aluminum busbars and PCB where machined on the Shopbot/LinuxCNC machine.
Last edit: 26 Jul 2016 04:07 by jut.

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28 Jul 2016 01:11 #78086 by tommylight
That looks nice!
What are switching with all those transistors and capacitors?
Regards,
Tom

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28 Jul 2016 22:46 #78116 by jut
Thanks Tom.
The capacitor bank (16V, 1.2F) is shorted via the mosfets across a metal joint to create a spot weld. It's known as a capacitive discharge spot welder.

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28 Jul 2016 23:09 #78117 by tommylight
Yup, i am fully aware of what it is and how it works, you did a neat job making it.
Keep up the good work.
Tom

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28 Jul 2016 23:22 #78119 by jut
Thanks for the comments.
BTW, that was version 1, which is 120J of stored energy. Version 2, which is about 80% done stores 500J.

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29 Jul 2016 00:25 #78120 by tommylight
Rail gun anyone ??? :laugh: :laugh: :laugh:

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