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  1. Great . Thanks guys definitely pratt and Whitney....

    Great . Thanks guys definitely pratt and Whitney.

    bill
  2. a couple of extra pictures:

    a couple of extra pictures:
  3. 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,
  5. might be worth slipping a sacrificial copper wire...

    might be worth slipping a sacrificial copper wire down the tube to prevent distortion.
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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...
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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!
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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...
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    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-)
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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
  13. 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)
  14. 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...
  15. 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)...
  16. 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 )
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    alum100k has been drinking the coolant agian ;-)

    alum100k has been drinking the coolant agian ;-)
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    It's Technicolour but it you are right it is...

    It's Technicolour but it you are right it is colourized makes them look like had a quick 'craigs list' makeover - looks like Duplicolor Gold to me :-)
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    Colchester lathes

    YouTube

    Colchester lathe company video showing some interesting production equipment from, I guess ,1950's

    Bill
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    I used my little hozirontal to turn a ball that...

    I used my little hozirontal to turn a ball that was too big for my lathe's ballturner for my earth/moon project
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    looks like one of the many copies of the...

    looks like one of the many copies of the southbend 9 inch
  22. Had a similar problem the other day... Earth...

    Had a similar problem the other day...

    Earth and Moon
  23. The early ones were one piece . The later...

    The early ones were one piece . The later carriage gear came with a pinned pinion gear (maybe a later repair).

    The pinion gear having a spigot that fits inside the larger carriage gear shaft
    Bill
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    Similarly, you could try a 10mm diamond tile...

    Similarly, you could try a 10mm diamond tile drill .
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    Edm (sparker) and CAM software

    The is may be a silly question but...

    Do you use a cam program to guide your spark eroder?

    We have a couple of ingersol sparkers (gantry 500 and ????400) . The guys working them work from...
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