Shopbot Desktop converted to LinuxCNC

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



image missing http://i.imgur.com/XiHPnIsh.jpg

Aluminum busbars and PCB where machined on the Shopbot/LinuxCNC machine.
image missing http://i.imgur.com/uYmjVSf.jpg

That looks nice!
What are switching with all those transistors and capacitors?
Regards,
Tom

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.

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

Thanks for the comments.
BTW, that was version 1, which is 120J of stored energy. Version 2, which is about 80% done stores 500J.

Rail gun anyone ??? :laugh: :laugh: :laugh: