Shoptask 1720 LinuxCNC

I liberated part of an arm from a dual monitor mount I had lying around. As I had dismounted the DRO I had to manually machine the mount the old fashioned way.

Power supply mounting for the Pi and screen is still up in the air (dangling wall-warts) as it turns out that USB-C power connections are complicated and powering from the chunky 5V supply in the control box is not going to fly.

The backboard is a piece of 16" melamine shelving which give the whole thing enough weight for the support arm adjustment to come into range and the Pi tray is the last part of an old datacenter keyboard tray I've been gradually scavenging from. The monitor is mounted with industrial strength Velcro. 3/4" x 1/8" steel strap and #8/32 screws holds it together.

This is just a ball-end modelled in Fusion 360. It took a lot of fiddling and figuring to get the workflow working.

It took a while to work out the encoder feedback and pid settings, but I think I am close. This is a G2 circle in pine with a blunt 3/8" end mill.

Code not checked in yet.

Now working on mount for display and RPI

I'm using a large PC case that was the last of it's kind display model purchased at Fry's Electronics just before they shut down. $80?

It has:

• a glass side
• a decent amount of space for wiring below the "floor"
• a large cutout in the "floor" for a water cooling system
• a tunnel at the top that is PC PSU cross-section

After a bit of Tetris and thought, I installed an 3mm aluminum sheet "mezzanine" on 50mm standoffs over the "floor". This gives

• Enough space between the mezzanine and the glass cover to install the tallest components - the drivers.
• Enough space between the floor and the mezzanine to install one of the three 6A/60V PSUs in the (slightly adjusted) water-cooling cutout.

The other two PSUs fit end-end in the PSU tunnel, screwed to the top of the case.

Around the three drivers there is two strips of DIN rail with the other component (see image).

Seems to work...

The 5V supply is 10A as I want to use it to power the Raspberry PI and monitor too.

Fun fact: the 3mm aluminum sheet has been knocking around since the late 80s, originally a blanking plate for a Sun 3/180 server rack, which I used to make redneck motorcycle panniers out of. (Sun shipped way, way too much hardware for those racks)