The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
Ya-but. . . . .
I KNOW that it worked when at Portsmouth University as the technician who swiped the probe and (bless him) had a copy of the parameters, sent me a dump of his back up including his programs. Some of these were for Lambretta crank flywheel balancing arbors that he was flogging on the side, and used the M19 spindle positioning to mill certain features :clap:
Sadly it's not a true 'C' axis in that it can just go to a position and lock on and brace itself for machining at that angular position, where as the Traub had a 'proper' C axis that could interpolate so you could machine as it moved, co-ordinating C, X, and Z.
I've been in touch with Mawdsley BER today, (the firm that grew from the ashes of Mawdsley Dursley that made the 27 kW spindle motor) as I would like to finally resolve what the field excitation SHOULD be. Apparently they do still have some records from that time and may be able to pull up a specification of it's parameters. They are searching their archive.
awemawson:
Well today is ANOTHER official GOOD DAY :ddb: :ddb:
Mawdsley-BER have dug through the archives of the original Mawdsley Dursley company that folded in the mid 1990's and found the original test documentation FOR THIS VERY MOTOR. Not one like it, or a generic specification, but the actual motor. Now I'm amazed that it's survived, and also very pleased as I now can definitely resolve the field coil current conundrum based on facts rather than guesses.
Copy attached
nrml:
Now that is what I call excellent after sales service. Nice to see that they still take the time and effort to support their products after such a long time.
cnc-it:
Just out of interest Andrew..is it possible to upgrade the C axis to full 4th axis or does that require replacing major components like the Mentor drive..?
awemawson:
Well the spindle encoder is there (1024 lines) and the DC Drive would do it, but the firmware embodied in the controller isn't set up for it as far as I can tell.
Reading the Siemens manual for the 820T there seems no reason it couldn't have been a full on 'C' axis but that's not the way Beaver implemented it.
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