The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
--- Quote from: nrml on July 08, 2018, 06:42:18 AM ---I am getting the impression that compared to the Traub, this lathe is poorly designed as far as the ergonomics of serviceability and choice of some components (like powers supplies) goes. Is this merely related to the age of the machine or does it confirm the stereotypical ''superior German engineering'' myth?
--- End quote ---
Well NRML no I don't think that follows. As the Traub had been in much more recent use, I wasn't so concerned to access every nook and cranny - believe me, it had it's idiosyncrasies. I never dismantled it mechanically to the extent that I have with the Beaver, and mechanically the Beaver is far more stoutly built. After all it is a significantly smaller lathe yet weighs 50% MORE than the Traub.
Don't forget the controller in this one IS German , and the poor placement of the battery with lack of forethought caused all those problems. And the twin paralleled up power supplies were made by a firm that was originally German .
Nowt wrong with British Engineering
awemawson:
I went to check on printing progress of the Mark 2 VDI40 blank plug and was amused to find that the Cetus 3D printer had a passenger - a grasshopper had (presumably) hopped onto the build plate and was taking a ride - remember in this printer design the build plate traverses back and forth - little chap was lucky that I hadn't turned the plate heater on :lol:
Came out OK, and fits which is the main point. I'll print one or two more but don't think that I need a full set twelve :scratch:
awemawson:
So coming out to inspect the finished (third) plug I thought I might as well see if I could set it going overnight to print a pair side by side. They just about fit on the build plate, so I set it going and wanted to wait until it had at least begun the second ones first layer.
So while waiting I investigated that mystery box on the rear of the contactor panel. A bit of stretching out and applying a 3 mm allen key and the L shaped panel came off - actually quite a weight, it's going to be fun aligning those screws on the way back !
As was expected there's a three phase transformer in there of a blooming big size - I'd hate to have to lift that into position on my own. But surprisingly there were also 'continental' fuses mounted down the side of it integral with the DIN rail terminals. Not the easiest place to get at to change fuses - mind everything also seems to have MCB breakers. (But I suspect that the transformer with the terminals and fuses is an off the shelf unit)
So the print software is predicting 13 hours before it's finished so I'll leave it to play over night
awemawson:
Well the overnight run printing two plugs at the same time came out a bit of a mess. The left hand one must have detached itself from the build plate shortly after I left it, resulting in a birds nest of PLA in pretty pink :bang:
Actually not too bad, as the other one came out fine. The mistake I made was not to turn on the heated platen ito improve adhesion. Two more printing, this time on a hot plate !
Meanwhile the postman brought an armful of parcels:
a/The replacement 24 volt 20.8 amp switch mode PSU, which I've put on soak test
b/ A 5 volt 5 amp switched mode PSU to replace the 78T05CT 3 amp 5 volt regulator that apparently is a regular failure on these lathes - also reduces the load on the 24 volt PSU by up to 3 amps
c/ Some DIN rail clips to mount the 24 volt PSU - it'll need an adaptor plate to pick up existing tapped holes in the PSU
d/ An extremely expensive Renishaw TP02S optical probe system
The original optical probe was a TP02 that had it's cylindrical battery within it's integral mounting spigot. The 'S' version take a standard PP3 version that can be changed without disturbing the probe mounting. This one has the 90 degree adaptor fitted, which I won't use - they just unscrew.
Bought 'sight unseen' my greatest fear was that it may have been left with a discharged battery within, (been there before) but my fears were unfounded. Yet to prove that it works. Information on the 'S' version seems a little sketchy (unless your Google Foo is better than mine . . . :clap:)
John Swift:
Hi Andrew
I have been watching your latest epic CNC re build with great interest
how long are the leads to the 5V regulator ?
I have had problems in the past with spurious oscillations without a capacitor close to the regulators input terminals
how close to the maximum 35V limit is the regulator being run
( how high does the 24V supply go when lightly loaded or has inductive spikes added to its nominal 24V output )
running any semiconductor at its limit shortens it life
equipment with transformers designed for europe instead of the UK does not help
( In my part of the UK the single phase supply is 248V at times
and some european 220V devices don't last long )
John
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