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  1. Just a Sparky

    Need help selecting a cutter grinder.

    Can the Weldon 'S' also sharpen endmill flutes by disengaging the gear drive & cam and fitting a stylus? Or does it's plain bearing suffer from the usual stick-slip that is characteristic of plain bearings? If I could satisfactorily use a Weldon 'S' to do both drill points and endmill flutes...
  2. Just a Sparky

    Need help selecting a cutter grinder.

    I like the idea of adapting a compact surface grinder. Would be nice to have one anyways for other things as mentioned, like cylindrical and... well, surface grinding. Truthfully my sticking point was that I had no idea any existed which are small enough (and self-contained enough) to be...
  3. Just a Sparky

    Benefits of Hydraulic Power in machine tools

    Some metalworking shapers and especially planers used hydraulics instead of the traditional scotch yoke or mechanically driven rack and pinion respectively. More linear forward stroke in the case of shapers and a faster return stroke with the tool spending more time engaged with the work and...
  4. Just a Sparky

    Need help selecting a cutter grinder.

    Let me answer your question by flipping it on end. I'm 27 years old. How many decades do you figure I have ahead of me to rack up that much or more in dulled, broken and dropped cutters before I get so old and crusty that I finally have to hang it up & sell my machines? If I hold out until...
  5. Just a Sparky

    Need help selecting a cutter grinder.

    So what I'm gathering from the conversation here is that the Cuttermaster will do endmills for me and I need a separate, purpose-built drill sharpener to do drill bits. I understand what all of you are saying and where you are coming from with the recommendation to go for a full-sized machine...
  6. Just a Sparky

    Need help selecting a cutter grinder.

    What are your thoughts on this guy in particular? https://www.shars.com/products/machinery/rotary-cutting-tool-sharpeners/universal-end-mill-cutter-drill-bit-grinder-sharpener It's an import Deckel clone, but it's a Shars import. Their stuff is usually known for being slightly better than...
  7. Just a Sparky

    Need help selecting a cutter grinder.

    I'm looking for a solution that will allow me to re-sharpen endmills (teeth and flutes) and drill bits. The ability to handle HSS lathe tools in a square collet would be a nice bonus, but that's not something I can't already manage with my bench grinder on the infrequent basis that I need a...
  8. Just a Sparky

    Air Compressor I.D.

  9. Just a Sparky

    Air Compressor I.D.

    Looks like a Brunner No. 102 to me but hard to gauge the size of it without anything to reference. Later/earlier design perhaps. Different valves and end brackets than I'm used to but otherwise largely the same as mine. Center valves are discharge, outboards nearest discharge pipe are intake...
  10. Just a Sparky

    Gluing/epoxying cast iron?

    Looking for a quick, low-temperature, low-strength fix to bond cracked cast iron. I like to collect and restore old electric motors dating back to the beginnings of the electrical age. Occasionally I'll run into one with a crack inconveniently located along one of the oil sumps. Some motors...
  11. Just a Sparky

    Question about using #6 THHN wire for a 30HP RPC

    Oh, sorry for trying to be helpful. Don't know why I even bother sticking my neck out here anymore. I've got better things to do with my time than hand out free insight if that's the kind of thanks I'm going to get for my trouble. Fucking douche.
  12. Just a Sparky

    Question about using #6 THHN wire for a 30HP RPC

    Skimming. You're looking for 110.14(C), which is a general rule. General rules apply to the entirety of the code (except Chapter 8 - see 90.3) unless explicitly modified elsewhere. https://up.codes/viewer/illinois/nfpa-70-2020/chapter/1/general#110.14_(C) 110.14 Electrical Connections...
  13. Just a Sparky

    Question about using #6 THHN wire for a 30HP RPC

    Hence state requirements for licensure, a big fat five digit bond and liability insurance to the tune of a few hundred thousand dollars at minimum. And enormous fines for doing electrical work without those prerequisites. Moral: Homeowners and handymen ought to leave well enough alone and...
  14. Just a Sparky

    Question about using #6 THHN wire for a 30HP RPC

    The first scenario you've described is illegal: 455.21 Start-Up Power to the utilization equipment shall not be supplied until the rotary-phase converter has been started. In the scenario described, AC power will remain on 'A' and 'C' busses regardless of whether the RPC is running or not. An...
  15. Just a Sparky

    Question about using #6 THHN wire for a 30HP RPC

    18 kVA / 240 V = 75 A Code requires conductor ampacity not less than 125% of the RPC single phase nameplate amperage. This is typical of all motor circuits throughout the code as an allowance for the possibility of sustained motor overload conditions and as headroom to allow for nuisance-free...
  16. Just a Sparky

    Question about using #6 THHN wire for a 30HP RPC

    Skipped. RPCs are addressed in a specific article in the code - specific rules apply to them. Read NFPA-70 Article 455: Phase Converters. In particular, Article 455.6. https://up.codes/viewer/illinois/nfpa-70-2020/chapter/4/equipment-for-general-use#455 Read Article 310 for the conductor...
  17. Just a Sparky

    Growly, slow three phase motor, but resistance of windings is consistent

    Looks like a 40's or 50's Century motor. Did you measure current on all three phases? Would be interested in seeing the locked rotor currents on all three. Motor should not be emitting smoke. The fact that it emits smoke during startup, yet the windings remain cool to the touch does not...
  18. Just a Sparky

    13” Cone pulley cover chart.

    This is what it looks like on an older single-tumbler machine.
  19. Just a Sparky

    American rotary ADX-60 high amperage on idle?

    Skipped. ADX60 appears to be a 40 HP idler motor. According to NEC table 430.250, full load amperage for a 40 horse, 240V motor is in the neighborhood of 104 amps. A 36 amp no-load current is realistic for a 40 horse motor. The only way you will get that lower is with power factor caps. If...
  20. Just a Sparky

    Growly, slow three phase motor, but resistance of windings is consistent

    OP has access to commercial three phase power. That will be a far more definitive test than anything else. It will either run, hum or throw sparks.

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