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  1. Replies
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    will ask as per pm. only pure tungsten work...

    will ask as per pm.

    only pure tungsten work I've done was lapping a long thin mandrel down a few um to size - slow pita
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    I was impressed by the hobbed chuck near the end...

    I was impressed by the hobbed chuck near the end 8-)
  3. I've setup a similar imperial thread on one of...

    I've setup a similar imperial thread on one of the metric lathes at work . I couldn't for the life of me remember how , but Larry's reminded me that you need the thicker metric banjo in order for the...
  4. That is really interesting:-) Looks like an...

    That is really interesting:-)

    Looks like an experimental engine with those standard bearing b on the axel.

    One for Doug.
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    We had a few track based mills (very good for one...

    We had a few track based mills (very good for one offs) . Their system is pc based . I've swapped mother boards and video cards to keep them running (getting hard to find isa boards these days).
    ...
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    you can only adjust position of the lever on the...

    you can only adjust position of the lever on the spline. The lock is usually ok if the gib is adjusted properly.

    bill
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    As mentioned in the film, these were , for the...

    As mentioned in the film, these were , for the amateur riders at least , converted road bikes. Many of them ridden to the event and rode home after.

    A friend was telling me of his first meeting...
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    is that track, where they are testing Greeve's ,...

    is that track, where they are testing Greeve's , Little Lovenly Hall (Earls Colne)??? looks familiar.
  9. Great . Thanks guys definitely pratt and Whitney....

    Great . Thanks guys definitely pratt and Whitney.

    bill
  10. a couple of extra pictures:

    a couple of extra pictures:
  11. Mystery compound slide , identification please

    This is small model or watch makers lathe compound slide , approximately 8" in length and width.

    Notable features:

    One of the 50 thou" per turn dials has doubled marking to show diameter. This...
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    looks a lot better than the one i made . 275...

    looks a lot better than the one i made .

    275 currency units* for it ???? depends how you value your time (nice little Saturday project)


    Bill

    * aka drinking vouchers,
  13. might be worth slipping a sacrificial copper wire...

    might be worth slipping a sacrificial copper wire down the tube to prevent distortion.
  14. Replies
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    and a whole lot cheaper! we spin moly . has to...

    and a whole lot cheaper!

    we spin moly . has to be hot worked . we laser cut it , not sure about plasma (shears can fracture it , it doesn't waterjet cleanly) .edges have to be smooth to avoid...
  15. Replies
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    repair the copper loops in the moving part.

    repair the copper loops in the moving part.
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    kidney stone ain't fun... Initially, i thought...

    kidney stone ain't fun...

    Initially, i thought I'd just pulled a muscle, but the pain increased to the point where I was on the floor hoping to pass out. Dialed 999 eventually ambulance arrived...
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    hows your recovery going Sam? fwiw I've been...

    hows your recovery going Sam?

    fwiw I've been plagued with kidney stone for the last month . damn thing does not want to go quietly!
  18. Replies
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    Common problem. there are copper wire loops...

    Common problem.

    there are copper wire loops through the lamination of the armature. Their job is to add a phase shift to the alternating magnetic field and thus prevent it collapsing when the...
  19. Replies
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    448

    Thanks, forgot to trt ebay. turns out nitinol...

    Thanks,

    forgot to trt ebay. turns out nitinol is used by fisherman so all sorts of sizes are there B-)
  20. Replies
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    source of nitinol wire (uk)

    I could do with a few short lengths of straight nitinol wire jn super springy mode (low critical temperature).

    Anyone know of a source? (preferably in the uk or will supply to uk)

    bill
  21. that looks like the same spec as the ones i used...

    that looks like the same spec as the ones i used (200uA =0.2mA)
  22. in most transistors and SCRs the middle pin is...

    in most transistors and SCRs the middle pin is connected to the tab electrically so the mounting tab has to be careful ly isolated to prevent shorts. The iso tab package isolates the middle pin...
  23. Managed to find my scribbled circuit diagram :...

    Managed to find my scribbled circuit diagram : (must be your lucky day)

    The thyristors are iso tab sensitive gate types , not the typical types, but most electronic retailers (digikey farnell)...
  24. The last one I repaired had blown thyristors...

    The last one I repaired had blown thyristors (from memory they are isolated tab and maybe GTO - gate turn off -sorry can;t remember exact type )
  25. Replies
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    alum100k has been drinking the coolant agian ;-)

    alum100k has been drinking the coolant agian ;-)
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