With most of the mechanicals reassembled, I can finally get on with assembling and connecting up all the electronics. I've not rushed into this so far, as it's helpful to get this right from the outset. The golden rule is normally to fit the electronics into an (apparently oversized) industrial cabinet and then fit it to the machine and connect it up. However, in this instance there's enough room in the machine enclosure to breed goats, so I'm reluctant to fit an additional layer of enclosure. Besides, the operator panel enclosure is pretty spacious, now that the CRT display and keyboard have been removed. Although I've sworn a few times not to try to cram stuff into too small a space, it's tempting to try to get the majority of the bits into that space. Will I regret this?
Firstly, let's see what we've got.
They are the GA500 series, which are replacements for the old V1000 family. The one on the left is the 4kW model with external EMC filter (from Schaffner) and (red) braking resistor (sourced from RS). The smaller VFD is a 2.2kW model. These smaller versions come with the EMC filter built-in, which is an improvement over the V1000.
The ETHER1616 is an expansion board that provides an additional 16 channels of digital inputs and 16 relay outputs. I won't need anything like that amount of additional IO but the default 8 + 8 channels of the base Acorn are a bit limited for running a lathe with all the inputs such as the turret, tailstock, limit / home switches etc. So I will be mounting the ETHER1616 on its own plate, next to the VFDs.
I let The Stupid Fat Bloke loose on the task of making up a baseplate for this and he wasted no time (well 30 minutes actually) producing one with the wrong sized inserts. The holes in the Centroid boards are around 4mm diameter, so you can just about get an M4 screw through if the inserts are placed with deadly accuracy. But fitting M5 inserts isn't the path to happiness, so I had to take over the task from scratch and do the job properly.
I use cinch nuts to provide fixings in metalwork and when it comes to PCBAs, I simply turn them upside down ie use them as standoffs. Not quite how they are intended to be used but it works for me. Here we are, ready to fit the PCBAs.
And finally, here's the PSU for the ETHER1616 and its ethernet switch (top left). I couldn't fit it on the baseplate without obscuring the terminal blocks and I'm not going to replace the open frame PSUs with DIN rail equivalents.