The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
russ57:
Russ
awemawson:
Thanks Russ
I started the day determined to bottom out that 24 volt monitoring relay issue that I linked out temporarily. The way it works is that CR10 is located on a remote card in the Chuck hydraulic control cabinet, and has it's coil straight across 24 volts. It's normally open contact is brought back to the big control cabinet in the rear of the machine.
Similarly CR20 is located in the Tailstock hydraulic cabinet on a similar remote card with it's normally open contact brought to the rear of the machine.
These contacts are wired is series (according to the diagram!) the common point being 'Terminal 100' the other side of the CR10 contact is wired to 24 volts and the other side of the CR20 contact is wired to a digital input where the voltage is monitored.
Now I knew that Terminal 100 was at 24 volts (so the CR10 contact is closed and working) but the other side of the CR20 contact at the digital input was at 0 volts. I had just wired the digital input to 24 volts temporarily to get round the problem.
So - open up the Tailstock box and pull the card out to check the relay. The card is located on the common nylon PCB pegs - it pushes on and a barb pops sideways to lock the card in. Easy to remove by pressing the barb back - except that I couldn't get at them. OK there is actually a proper tool for this job, essentially just a suitable diameter tube that presses onto the peg and releases the PCB. No, I didn't have one, but I have a box of bar ends and a lathe, so yes now I do - made it SO much easier :ddb:
Then I gingerly powered up with the card free floating on it's wires and check the relay contact. Sure enough - closed powered up, open with no power. So if it's not the relay it must be the cable. Belled the cable out - no it doesn't go to Terminal 100 - it goes to Terminal 99 - and nothing else goes to terminal 99, it's all on it's lonesome doing nothing !
However, unlike the diagram, there are two extra wires on Terminal 100 that are not on the diagram, a Green and a Violet, so at some time I'm going to have to trace where they go. But I took a chance and moved the wire from 99 to 100, and guess what, it works. Now as it was the CR20 contact can never have been in circuit and it never worked - very very odd as I certainly haven't moved that wire :scratch:
OK knock that issue over (and created another mystery) so back to trying to initialise the Turret.
Later Edit: well of course I couldn't leave it at that so I chased those wires. The Green one goes into a cable form labelled 'Zero Ref' and the Violet one goes into a cable form labelled 'Position Switch' presumably providing power to these devices :scratch:
hermetic:
Sort of points to the possibility that some other accesory, now removed, was connected between 99 and 100 to modify the sequence, tracing the two non standard wires may give a hint!
Phil
awemawson:
OK Turret Initialised :ddb:
I spent some time trying to master the Siemens Sinumerik implementation of MDI - MDI being a way that you can give the machine a few manual commands to move or spin or change tools. It is also used to send initialisation codes to the Turret Controller (a Baldor SMCC 602090-102) which is a microprocessor controlled servo system looking after turret rotation, clamping etc.
The trouble was that I had initially miss-understood a command line in a crib sheet that I'd been given, and having entered it the machine (correctly as it was wrong) refused to run it, but I could find no way to delete the wrong information.
Much experimentation and button pressing and we are initialised.
So now I can jog all axis, select tools, start the spindle and it seems all systems are 'go' I've not actually yet found how to extend the tailstock ram or spin the powered tooling, but progress continues :thumbup:
vtsteam:
Just catching up....exciting day yesterday! :thumbup: :clap:
An you're moving right along today, with all axis moving. Good man! :beer:
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