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  1. C

    Prvomajska ALG-100*power feed

    Going back to your first photograph or so, I have those sliders for the stops, but they do not work, they do not catch the operating pin. Outside of these mounted as sliders in the same slots are stops that have a proper V in them to catch the pin and these actual do the job. I actually posted a...
  2. C

    Alexander deckel FP1 clone

    As a hobbiest, I use one of these Dahlander wound motors from a static phase converter. The converter came with the mill ( a different Deckel clone) and was faulty so I fixed it and at the same time optimised the phase currents. There is a write up in "Model Engineers Workshop" magazine #242...
  3. C

    Mori lathe possessed by the devil

    That motor with zero V Ph- Ph and 220V Ph to Gnd. I would ignore it. The 220 V you are measuring is some sort of leakage path, perhaps through a suppressor capacitor. That is if your ground point is actually ground. Trace the wiring back and see which contactor feeds this motor and see if it has...
  4. C

    OT- Can aftermarket frosting on door glass cause the glass to shatter due to heat ?

    Its the tempering that makes the glass fragile. Once I moved an electric oven from a cold garage into a house to wire it up the next day. After two hours the glass door just shattered on its own. I suspect that your extra layer caused extra temperature differential between the inside and the...
  5. C

    3ph voltage issue with RPC

    As I understand, when you switch on the RPC, its motor starts on a "start capacitor", once the motor has got up to speed, then an internal voltage sense relay switches out the start capacitor and put in a run capacitor. When you switch on your external motor, if it takes too much current, the...
  6. C

    Help with old "Flesch & Stein" German lathe

    How about that special nut , when tightened drives the pulley sheave forward to lock against the bull wheel. Screwing the nut backwards allows the sheave to rotate freely from the bull wheel* but still has the small gear on its end for the gear box and the back gear drive.? * hence needing an...
  7. C

    OT- Mysterious bathroom fixture - what is the purpose of this ?

    Two half cock suggestions:- We once had a soap holder that worked by pressing a bit of soft steel into the soap and hanging it on a fixed magnet, so is it magnetic? The other is I install a "knob" or "bar" of some sort, so one can hang a face flannel on it to drip dry, looks too low for that...
  8. C

    How much can a servo handle?

    Can you not balance out some of the static pressure out with springs. This will reduce the servo requirements. Frank
  9. C

    Cuttting 4.75" diameter hole in lead

    Harry Patch (AKA "The last Tommy") died at 115 years old, he had been a lead worker. Lead poisoning is not a life limiting disease, it reduces the IQ and increases violence in the youth. Having fiddled with lead, I think lots of small chips is not the way to go, rather one long chip would be...
  10. C

    O.T~ Power plant question

    Memories of Fawley I once went around around Fawley on a PTA trip. Memorable things were a control room like the one NASA used, but with a 1940s looking pen recorder on the desk. So I had to ask what it was for. It measured in real time the clearance between the vanes of the turbine. Which...
  11. C

    Convert rotary motion to reciprocal motion>How to do it?

    I have done some professional coil winding in the past, so I think there is not enough tension in your winding process. Are there some tensioners on long bits of springy wire? . With conventional solenoid winding, the mechanism, reverses before the end, using the tension on the wire to pull the...
  12. C

    Is it possible to wire a replusion-induction motor to a drum switch for forward-rev?

    Make a new brush carrying plate with a set of brushes in each position. Then you need a two pole two way switch to swop the wires over between them. Frank
  13. C

    Making Custom Collet

    Thanks Tom, straightened my thinking out . :-) Frank
  14. C

    Please help with wiring dual-voltage motor

    I would say you need two start capacitors each of 30 MF. I reckon terminal 1and 2 are the connections to the start /run switch on the shaft. This upsets all your measurements. I would take the end bell off and open the switch and leave a bit of cardboard in between the contacts. Just while...
  15. C

    not a deckel, but may I step in???

    I have a Prvomajska ALG-100 like you. About 15 years ago when I first got it, I manages to shear the pin. I did find in one of the bits of paper I got with it, .5mm piano wire was used for the shear pin. In my manual, a different style of overload with a spring powered cover used a 1.5mm...
  16. C

    Making Custom Collet

    I need to make a Deckel Hi-speed head collet on a lathe without a collet holder. I was going to turn it all between centres, including the thread. Then chuck it, finish the outer taper to size and angle, drill and ream the hole at the same time ,ensuring concentricity. Finishing off in the...
  17. C

    Vise placement?

    A bit OT, but its something I wish I had done. Putting in some sort of moveable support that align with the vice jaws but over hanging the bench slightly. this is so when setting up a bit of 8' long material, one can rest it roughly in the right place, while adjusting the vice end precisely...
  18. C

    single phase to 3phase VFD on Dahlander wired motor (lathe)

    You need a transformer (or three) between the motor and the VFD. The wye/delta switch must be between the transformer and the motor and must not be operated while the VFD is on. FWIW Dahlander motors (or at least mine) have a very large difference in running current, 3 A at low speed or .9 A...
  19. C

    How to repair a steam locomotive

    12 days maintenance every 130,000 miles. Easy to see why they were replaced. Frank
  20. C

    true 3 phase transformer - how does it really work - how can I test it?

    A three phase transformer can be simulated by 3 single phase transformers. You feed one , L1 and L2, the second L2 and L3 etc. As the magnetic flux does not peak at the same time on any two windings, the windings can share common magnetic paths, as each leg of the transformer only has the...

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