The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
For the threaded spheres I thought I'd see what I could bodge together from an M6 bolt and a bit of copper pipe. The largest hole I felt I could drill through the bolt was 3.5 mm and still maintain some strength in it, so I mounted it up in the lathe by the simple expedient of running a spare nut onto the end to keep it concentric. Then I ran the drill through and counter bored with a 6 mm flat bottomed end mill.
Setting a scrap of 1.6 mm welding rod upright in the vice I threaded the components on ready for silver soldering and had at them with my propane torch.
Hasn't come out too badly considering the crudity and will probably work, I just need to produce an other five or six of them.
Meanwhile I placed an order for the coolant which should arrive shortly after Christmas
awemawson:
Made some more up this afternoon, so now all the tools that are fitted have coolant nozzles. The two locations in the tool disk that have no tools will probably have axial drills or boring bars so will need custom lengths as and when.
(Looking at the picture I must remember to put the missing VDI40 blanking plug in!)
awemawson:
I found a curious thing later this afternoon . .
By program :
M08 turns coolant on
M09 turns coolant off
. . .or at least they should :scratch:
There is also a pair of push buttons on the front panel for 'coolant on' and 'coolant off' . Now these buttons work just fine. Ploughing through the PLC logic I can see the bit where it handles the coolant contactor, and there is a mystery latch that has to be set to enable the M08 /M09 commands to operate the relay. But for the life of me I can't see what is supposed to set this latch
There is a bi-stable that represents COOLANT within the PLC logic, and writing a loop to turn coolant on, pause 5 seconds then turn it off, then pause 5 seconds and go back and start over I can see the bi-stable changing state but it's output doesn't get to the output for the relay due to the mystery latch - all very odd :scratch:
awemawson:
Mystery solved :ddb:
The Siemens 820T control console has masses of push buttons, the vast majority of which are not used. However it turns out that next to the two button that turn coolant 'ON' and 'OFF' which are clearly labelled, is a third, that with the aid of a torch and magnifying glass, you can just make out 'COOLANT AUTO' :lol:
. . . . obvious in'it :clap:
tom osselton:
That’s the last place anyone would look! :thumbup:
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