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  1. J

    American rotary ADX-60 high amperage on idle?

    15 amps is reasonable for a 100hp motor if it has power factor corrected capacitors, in which case you would not see a near perfect 90 degree phase shift as you are now. I think you have a x10 error between your two meters. I personally would not be surprised if you actually do have 150 amps of...
  2. J

    SB 9: repairing back gear

    Apologies for digging up an old thread but this was my upgrade. The small back gear is an off the shelf briggs and Stratton crankshaft gear that drives the cam. Dont know where i got it but they are not hard to find. They are 26 teeth, you may be able to find a 24 tooth gear. The 3d printed...
  3. J

    DC bus capacitor new vs. old discharge times are not what I expected.

    They may be selling capacitors that are not totally formed. The leakage should decrease over time.
  4. J

    Finishing Babbitt Bearings

    Factory spec on 1.9 liter vw tdi alh engines and several others was 5 tenths to 25 tenths for the connecting rod clearance. This is about 2 inch diameter bearing. Red line around 5500 rpm. They tend to fail 30 minutes after they run out of oil. Surface grinder spindles running oil thinner...
  5. J

    Best compromise for less than ideal main bearing bolt design?

    i found a comment here https://www.eng-tips.com/viewthread.cfm?qid=375921 inline6 (Mechanical)1 Dec 14 17:03 I did some testing of gr12.9 metric m12 screws into various aluminum alloys to look at thread stripping and some elasto plastic axisymmetric FEA as correlation some time ago. What I...
  6. J

    Best compromise for less than ideal main bearing bolt design?

    I called ARP and someone explained to me there is nothing weird going on with their threads to solve this problem He was able to tell me that they sell studs for certain aluminum bmw blocks and they have 30mm of thread engagement. the studs sold for the iron blocks have 25 or 20 i can't...
  7. J

    Brother power issues?

    These machines can pull 70 amps or so, and you cant measure the voltage drop with a dmm because its such a short duration, you need an oscope. Higher voltages to solve the sag problem will cause over voltage trip during spindle stop.
  8. J

    Four Facet vs. Split Point

    A true center cutting split point, in my opinion needs to be a continuous spiral out from a zero web thickness point at the center of the drill bit.. Practically this is impossible. If you have a dremel and a 1/32” diameter electroplated diamond bit, you can create it. Instead its a compromise...
  9. J

    Need a better oil free air compressors

    Friend of mine goes through about 1 schultz air compressor per year. 1hp 1750 rpm 2 cylinders, single stage, turns on at 70 psi off at 105, runs as much as 50% of the time. "Msv 6" is the number to google. Problems are the pistons fatigue, the metal springs (flat metal bent a little to expand...
  10. J

    Rethreading BSW to fit NC.

    A soft 3/8 threaded rod should be able to be driven into the harder steel tooling, perhaps with high pressure grease so as to not damage anything, and you can get enough threads of engagement. You can pull a couple thousand pounds from a soft 3/8 threaded rod and a couple threads engagement...
  11. J

    Tapping fluid that doesn't stink.

    Nah, just average to good quality uncured bacon i fried up in a skillet and poured off the lard/oil/grease whatever you call it into a can thinking i would do something with it later, like start a fire with it, or make soap, but never did. On a serious note: Wife found a guy on tic Tok who had...
  12. J

    Tapping fluid that doesn't stink.

    I must be buying the wrong bacon because I've had a can of rendered bacon fat on my counter for a year now and it hasn't gone bad. I cant smell it but my cats wont eat it. However they will lick the skillets clean.
  13. J

    Tapping fluid that doesn't stink.

    The TCE shit is no joke. I was at MALS-14 from 2008 to 11 and knew a female GySgt (E-7) (about 20 years older than me) who confirmed to me that the stories of the fumes in the airplane hangars were so strong they would melt the plastic components on your uniforms was true. --the offices in the...
  14. J

    Way oil - what is the magic of Vactra

    I have mentioned this before but its easily lost. I made a surface grinder using a 56" long cast iron optical table which had just a half inch wide V and flat. I had a 60 pound load resting on 3" long strips of plastic, which made for about 20 psi contact pressure. I put a lot of muscle work...
  15. J

    small CNC milling machine

    If they were to make the spindle casting just 3 inches deeper or taller, the bearings could be spaced apart from each other slightly more than the rails are separated, and slightly more than the distance from the spindle to the rails, and that machine would be much more solid. The x axis...
  16. J

    Plain bearing spindle design

    I have to disagree that turbos are highspeed bearings. They are more like medium speed. The one foot or even larger journal bearings that support the generator shaft of 1 gigawatt 3600rpm turbo generators are running at a higher specific speed than most consumer level stock turbos. A 10mm...
  17. J

    recycle T&G flooring??

    Dont bother pulling the nails out, just feed the boards slowly through the saws.
  18. J

    Help with remote speed and direction control for VFD

    I might be wrong but my fuji vfd has a -10v output and be configured for forward reverse with 0 to plus or minus 10. So you could use a regular variable resistor and center would be off. You would then only need one additional off switch to turn the lathe on and off. An additional E stop...
  19. J

    Rotation problem with rotary phase converter

    Yes substantially. A 15hp motor is probably equivalent to 4 or 5, 5hp motors. For a few hundred$ you can buy a 15hp rpc starter
  20. J

    Rotation problem with rotary phase converter

    Lets go back to what you said. When the machine is running in this condition, what are the amps..
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