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Followup: We have rotation

Went out to the shop today with my trusty Fluke 12, I saw up to 300Vac out there. WTF.

Checked each side of the centertap and it was running 150v.

Powered up RPC, now I'm showing 245v hot to hot and evenly split across the center tap.

Played with the lathe, I see a momentary drop to 200v when I start it. Not too suprising. My network connections held up. My irc server never dropped a connection today. Started and stopped drive motor many times.

Had to fix the lathe a bit. My Clausing has a QC engagement lever that blocks changing ratio's in the QC box. A plate engages two short pins and it was loose. Had to rtfm to noodle this out.

Played with turning, facing, knurling, parting and threading. I'm used to a Leblond Servoshift so everything seems wrong. The worse thing is the half nuts engage by pulling up not down.

Checked voltage at end of day when I shut down rpc. Nice and normal.

Tomorrow, I'm going to id turn some threads for a 5c drawbar in some 1 3/8 .095 wall dom tubing. I'm starting to learn the girl. That 4 jaw independant chuck is a pita.

I hope my moglice repairs of the reeves drive holds up. Time will tell.

Wes

Reply to
Wes
Loading thread data ...

too suprising.

today. Started

by pulling

150VAC?! That's way out of spec and will start cooking stuff.

I had 135.6VAC here one day, I noticed when my big UPS switch to battery on over voltage. I validated the UPSes displayed 136V with my Fluke 87 at 135.6V and called the utility. The CSR I talked to had no idea what I was talking about but said she'd relay it to a tech. Amazingly enough in less than 10 min I got a call back from a tech and I explained what I found. Another 10 min and a truck was in my driveway and by the time I got out of the house to talk to him, the tech was on the radio talking to another teach heading to the regulator bank a couple miles up the road. In barely 30 minutes I had a nice reasonable 127V. I was pretty impressed with the response.

Reply to
Pete C.

I wonder if the utility is switching some power factor adjusting capacitors in and out to counter some industrial inductive loads in the neighborhood. I'd at least call them and report.

I assume you are using an rms reading meter, since you say the voltage is normal at the enc of the day.

Pete Stanaitis

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Wes wrote:

too suprising.

today. Started

by pulling

Reply to
spaco

They might have a swinging transformer that jacks up the voltage when loaded and backs off to a lower voltage setting.

Might be switching caps that do about the same thing - if in series with a winding.

Motor speed controls on high tech fans have two or three caps to change the speed.

Mart> I wonder if the utility is switching some power factor adjusting

Reply to
Martin H. Eastburn

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