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Oh Blimey I bought a CNC Lathe !!!!

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awemawson:
Now there's a cunning scheme. What limit's the brightness you can get down a fibre? Obviously length - probably the thickness, any other parameters? Does the fibre need matching to the light colour ?

DMIOM:
Colour matching - no worry unless you're at either extreme of the spectrum. Maybe a bit late but there are 'fibre optic Xmas trees' out there with multifarious illumination - maybe you could cannibalise one of them and just re-bundle the fibres with heatshrink - we're not worried about coherent light here!.

They're certainly available ready-made for endoscopes (at a price!) but there are even off-the-shelf adapters for the smaller Maglites

(and Deko on here has been making a clock with fibre to the dial, so he may be able to help as well).

Dave

Pete W.:
Hi there, Andrew,

Have you made any more progress with the Isoma 'scope?

How are you focussing it?  Have you got a feel for its magnification?  (The higher the magnification, the more critical the focussing.)

Please could you post a photo of just the microscope?

My Isoma 'scope has an eyepiece for viewing rather than a projection screen.  The eyepiece has a focussing ring to bring the cross-hairs into focus and then the 'scope is focussed on the object by adjusting the objective-to-object distance.  The problem with mine is that something's adrift in the objective, could be delamination or could be fungus in the cement between the elements of the objective, it's not yet a current project. 

awemawson:
Pete, a bit of progress today in that I wired up a 'batwing' 700 lumen LED to a step up inverter off a pair of Lithium Ion cells, and constant current drive at 350 mA screwed onto a block of aluminium to keep it cool. Mounted the ISOMA in the chuck of the Bridgeport and pointed it at a ruler with direct illumination from the (VERY BRIGHT) led array, and got quite a good image.

It was literally a 30 min dash into the workshop - I've been down a trench all day laying drains for a new pig pen - also shifting the bits of the inflatable Chinese Field Hospital I use as a lambing shed ready for the onslaught expected at the end of the month while the rain has stopped.

Actually a bit of a downer on the Traub - the main spindle inverter has had an intermittent issue in that occasionally it's power supply cuts out and won't come back on unless left off for a few minutes. After which it's ok for the rest of the day. I had to turn the workshop heating off the other day (emergency oil shortage for our letting cottages so I pumped the workshop supply to the cottages until it arrived) Since then the intermittant issue is now perminent  :(

 I've not yet been able to prove if it's intrinsically the psu itself, or it's load. Things keep taking me away from persuing it. It must be a warm up issue, but freezer spray and a heat gun haven't got me anywhere  :bang: I even pulled the psu (which generates about 8 isolated outputs), left it to cool over night, then powered it up and it was fine. Reassembled it's load (the intelligence of the inverter and the drivers for the 150 amp mosfet H bridges) and it worked for weeks  :bang:

chipenter:
Lots of lambs on the Romney Marsh yesterday it may be sooner than you think .

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