Member postings for Johannes

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Thread: Harrison M 300 (1978)

06/09/2009 09:33:30

Since a couple of years the 0 to 8 knob of my ( newly bought in 1978)

M 300 lathe, is "frozen". I left it for these years because I did not have enough space in my former attic workshop in the Netherlands, to dismantle this gearbox, and I did not have to cut screwthreads. Now that I have been moved to Burgundy, France, I have a workshop of around 100 m², and ,after ordering 3 phase electrics (no problem in France: for around € 900,00 EDF did give me the 2 other phases,50m 4 x 25 mm² , a new electronic kWh counter, day / night , 10 hours labour by 2 electriciens. I did the 230 / 400V house / workshop wiring myself,as I was an electr(on)ic engineer in my working days, I studied before the french NF C15-100, ). Now that my workshop gets ready ,I want to repair my beloved lathe. When trying to use the 3 pitch selector switches, there are yet only two (quick) feeds in working order, the rest is dead. I need to say that I never refreshed the Shell Vitrea 72 oil in the gearbox.

I have heard rumours that there is a (delrin) curved drum inside the gearbox, that selects the pitches, and that this drum sticks after years. Does anyone has (had) the same problems? Maybe Tony Griffiths has heard this problem before? Are there suggestions from collegues machinists? Johan Berserik

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