The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)

The Craftmans Shop > New from Old

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JHovel:
Andrew, reading your exceptional progress with great interest.
Could you use a mirror to redirect the IR signal back to your sensor? While probing, I imagine there would be no coolant interfering with the mirror. Perhaps mounted high in the enclosure (even near the top of the door) might just work....
Cheers,
Joe

awemawson:
Joe, I had considered making a prism that would sit on the existing window but 'look the other way' , but I'm not sure what optically clear (at IR wavelengths) plastics there are that are available, easily machinable, and able to be polished :scratch:

Today I started gluing up a wooden box to house the LT02S probe and holder, and 3D printed a cover for the ruby probe itself. Hopefully tomorrow the PVA will be set enough to finish it off and fit catches and hinges. I used the offcut of the 12 mm ply that I got for the counter top of the Versatool cabinet. What horrible stuff modern plywood is - looking at the cut edges it was full of voids.

awemawson:
So while the first coat of varnish is drying I did an experiment to see if the MP12 probe would work though glass. Casting about for glass in suitable sizes I came to the conclusion that it is surprisingly rare in my workshop :ddb:

Eventually I settled on my 100 mm magnifying glass that sits at my desk - it has the advantage that the glass is pretty thick.

End result is that the probe is quite happy to function both sending and receiving through the glass, so I've splashed out and bought some small prisms on eBay. Coming by slow boat from China so not expected until the end of the month. To get the size right I need to mount two 10 mm x 10 mm x 10 mm next to each other so a bit of fiddling required.

I seem to recall that there is a special optical glue used for lenses in contact, but actually I don't suppose it'll matter in this case that half the signals go through one prism and the other half through the second one :scratch:

charadam:
Canada Balsam used to be used for lens gluing, but has been superseded by synthetics.

awemawson:
That's the stuff :thumbup:

Not to be confused with Friars Balsam :clap:

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