The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
No nor do I Pekka - it's very odd :scratch:
I can see why the finishing cut approaches slightly beyond centre to eliminate any possibility of a pip, but not 6.6 mm ! The program is set up to move the tool tip allowing for tip radius, so I don't see ANY reason why there should be material other than the 'finish allowance' left to machine.
OK the 30 degrees approach has solved this particular issue, but I'd like to understand the generality
cnc-it:
You are welcome Andrew :nrocks: Probably with it being a different version of FC but mine defaults to 30 degrees lead in and lead out on turning and milling. You can set up all these things before hand by using the manufacturing tab then the machining attributes tab :headbang:
awemawson:
Oddly John, when I go into the Manufacturing -> Machining tab it is set to default to 30 degrees, so goodness only knows how it got set to 0 degrees when processing that simple dome . . . life is full of these idiosyncrasies :scratch:
awemawson:
Time to re-wire the lathe and the associated bits of infrastructure wiring !
Today I was experimenting with threading programs - I've not actually got a threading tool mounted yet but wanted to prove that the inbuilt threading cycles work. (they do :thumbup:) They use the same position encoder that is involved with the axial spindle stop function (M19) that I still haven't got working (*) and to get a good finish whirl away at maximum spindle speeds using loads of power.
Well I managed to trip the 32 amp type C breaker that the 3 phase is sourced from, and the SY flexible cable to the machine was distinctly HOT ! - not unexpected, the 27 kW spindle motor is the main load and at full tilt accounts for 48 amps at 415 volts three phase. The SY cable being 2.5 mm csa is only rated at 24 amps !
So I'm going up to 6 mm csa SWA cable rated at 53 amps, and will upgrade to a 63 amp 5 pin interlocked socket and plug (Looking for one of each if you have them skulling about !)
(*) I've made contact with a company who have two of these lathes of a similar vintage, and although they don't actually use the axial positioning M19 facility know that it is embodied, and are happy for me to go and poke around and see if I can find out what enables it.
BTW these two lathes are used intermittently making parts for Merlin engine rebuilds so a visit should be extremely interesting anyway.
cnc-it:
Sounds like a shop tour coming on..great to see some British made machines are still making parts..
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