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Recent content by woodworkerJB

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    Davidson D-600 autocollimator - Can someone a few a few questions for me?

    Davidson D-600 autocollimator - Can someone help with a question? Hello All, I just purchased a Davidson D-600 autocollimator. Would someone with specific knowledge of this unit, be willing to answer a few questions for me? JB
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    Hydraulic check valve questions

    Thank you both for your help
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    Hydraulic check valve questions

    I'm sorry if I wasn't clear. The check valve pressure rating is 5000psi, the cracking pressure is 65 psi.
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    Hydraulic check valve questions

    Hi All, I am putting together a hydraulic circuit and being an amateur at hydraulic I have a few questions. There is only one double acting cylinder in the system. My goal is to be able to extend or contract the cylinder and locking it in place when the directional control valve is put in...
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    Using a 40hp 3 phase motor for a rotary phase converter

    Jst and all thanks for the advice. Jst if I were to get a 45kva 3 phase transformer is it possible to only use 2 of the legs so I could do single phase 220 in and the 440 out so I could build another rpc to run the 40 hp idler?
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    Using a 40hp 3 phase motor for a rotary phase converter

    Jst - I am sorry I left out the transformer details. In fact it is a 15kva 3 phase unit.
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    Using a 40hp 3 phase motor for a rotary phase converter

    Hi all, In a previous post I asked about the best way to use my current 220v 10hp rpc to run my 20hp 460v lathe. One of the suggestions was to get a larger motor and make it into an rpc. Today I came across a reasonable deal on a baldor 40 hp 3 phase motor. As a side note I later found out it...
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    My lathe placard calls for 20w-20 oil not easy to find locally. Is there better oil?

    Tom, yes in fact it is a servo-shift
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    My lathe placard calls for 20w-20 oil not easy to find locally. Is there better oil?

    I bought a Leblond lathe and would like to change the oil in the head. The placard calls for 20w - 20 motor oil. I am finding it difficult to find locally and the oil I find online is a bit expensive. The lathe is a 1976, I am wondering if oil technology has changed and there is a better oil...
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    Advice needed for Modifying my current RPC to accomidate larger a larger machine

    Thanks JST, what could be done to resolve the starting issue?
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    Advice needed for Modifying my current RPC to accomidate larger a larger machine

    Hello All, A few years ago I built a 220 volt 10 hp rotary phase converter based off of Bruce Norton's design. I figured that I would never need more than 10 hp. Well! I bought a Leblond 20 SL lathe that has a 2 speed 10/20 hp 460 volt motor. I do not not see that it is possible to re-wire...
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    Opportunity to buy a used Hypertherm Powermax 85

    Hello All, I just got a phone call from an acquaintance of an acquaintance or in other words someone I don't know. :) Anyway he has a 3 year old supposedly in good working order, hyper-therm powermax 85 he has offered to sell me for $2000. It is suppose to have the cnc card in it but it has...
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    Balancing rpc - what am I doing wrong

    In addition to the above questions about balancing. Why is it that when measuring voltage From common to L1 and L2 I get 122 volts each but when between L1 and L2 I only get 210? Shouldn't I be getting 244?
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    Balancing rpc - what am I doing wrong

    The numbers in the original post are without a load motor, but with the idler motor running.
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    Balancing rpc - what am I doing wrong

    Hi all, I just "finished" my 10 hp rpc. I am trying to balance the legs and I clearly am doing something wrong. The idle motor has a max amp of 26. My L1 - L2 are 209 volts. So far I have bc at 233v ab at 232v AC at 208v no matter what what capacitance I add to the CPf It won't change the...
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