The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
RotarySMP:
You got lucky with only a birdsnest from your 3D printer. Whenever I leave mine alone, the filament ties itself into a cloves hitch on the spool, and then the Z Axis climbs itself up the filament untill the Z nuts are free. Causing birdsnest plus need for realignment and leveling.
Mark
awemawson:
John, when the faulty 24v psu was in it went to nearly 35 volts. The regulator is fine at the moment, it's just that talking to a chap who used to be involved with these lathes, apparently it's a common point of failure. Anyway nicer to have a separate 5 volt supply off the mains rather than draw up to 3 amps off the DC. (24-5 = 19 volts drop at maybe 3 amps is 57 watts just there alone and the 24 volt supplies are regulating down from 38 volt to 24 at 14 amps - there's another 196 watts !)
Remember this cabinet is the one that they found necessary to equip retrospectively with a Vent Axia fan in the roof so it obviously ran hot. Replacing the three linear power supplies with two switch mode ones will dramatically cut down on the heat.
Admittedly I'm only soak testing the replacement 24 volt supply with a 48 watt bulb, but it's been on for several hours and isn't even warm to the touch. Same load on the repaired 24 volt supply and it was too hot to touch.
So all this time the twin plugs have been printing away and I've been shifting tons of earth round the back of the tractor shed. (*)
(* https://madmodder.net/index.php/topic,11819.msg150824.html#msg150824 )
awemawson:
Time to install the new power supplies, first I made up an adaptor plate to mount the DIN rail clips on the back of the 24 volt supply, then I removed the remaining old linear one to make way for the new.
DIN rail cut to size and drilled for 3 off M4 screws and the back plate drilled and tapped. Then, clip on the new supplies and wire them up - simples. The 24 volt and mains wires are all original, I just re-terminated them with boot lace ferrules, so if it were necessary to re-fit the old supplies the wire lengths are still correct. The 5 volt from the new supply replacing the little 3 amp regulator is all new though.
Took an amazing time to do it all - about 3 1/2 hours !
awemawson:
Well at last I've received the drawings for the wiring, so a bit of printing out and studying called for today :coffee:
I've also received three faulty 'driven' tooling holders from a seller in the US. Advertised as seized but seeming to be the correct Baruffaldi fitting with the segmented drive dog, I thought that rebuilding them was a better prospect than building from scratch as I had intended.
I expect that the in line co-axial ones will have needle rollers and thrust races, whereas the right angled one will have bevel gear as well. Back burner job to investigate them as too much on my plate at the moment.
These things are horrendously expensive to buy new - the simple one are of the order of £1000 and the right angled ones at least £1500. Needless to say these were a very small fraction of that price - £150 - I thought that I'd better grab them as they flitted by as they are not the most common of items.
awemawson:
OK time to bite the bullet and put the controller back in - a bit fiddly, but far easier than taking it out - at least now all the connector retaining screws work, rather than having to be sheared off due to the corrosion !
Massive earths went back first - at least they will tether it if it has a desire to plunge off the shelf, then the mains input, then all the interface connectors. At the moment it's just pushed in unscrewed - I'll leave final screwing in until everything is working otherwise I reckon I'm pushing my luck.
While this was happening, Adrian the Parcel Force man delivered some DIN rail stop blocks. When I replaced those power supplies the day before yeaterday, I'd thought I had some but no, wrong again. Well I have now :ddb:
So stop blocks fitted to stop the PSU's sliding along the rail in case we get a sudden gravity surge. Actually, it's quite easy when working in a cabinet, to accidentally move something and stretch cables - been there - done that - now fit stop blocks :ddb:
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