Thought you'd sorted the encoder?
Turns out that the Acorn spindle encoder input requires differential inputs, yet the 3 encoders that came with this machine are all single ended. Bollocks. Let's whip the spindle encoder off and take a look. It will have to come off anyway, most likely, so may as well dissect it and perhaps use it as an adaptor for its replacement.
Yep, very similar to the ones that came on The Shiz - but single ended. It's very similar to the ones on the Shiz but different. No clue there. But the green is a chassis / screen connection, the red is +5V, black is 0V, so the yellow, orange and blue must be the A, B and Z. Clearly single ended.
This cast housing accommodates the bearings as well as the electronics.
The usual glass disk with graticules(?) and optical pickup (on the PCB). Shaft retained by tiny circlip.
Couldn't undo the tiny screw retaining the glass disk but removed the circlip and managed to drive the shaft and disk out easily enough.
Having driven out the mini bearings, there's a steel carrier that seems to be glued in place. That needs to come out but a tap with a hammer doesn't even touch it.
Butw e have the technology.
I could simply turn down the extraneous gubbins but it's quicker to saw off the bulk of it...
...leaving just a fairly small job for the lathe.
Sorted. A bit of deburring and Bob's your aunty.
Time for a Chinesium clone. Try this one, which appears to have differential outputs, unlike the majority of the encoders out there. And a metric bored flexible coupling. Naturally the original shaft is 1/4" ie 6.35mm, so won't fit. I'll need to bore out one end to 1/4" so it fits the original driving shaft but we have the technology for that.
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