| The Craftmans Shop > New from Old |
| The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20) |
| << < (193/260) > >> |
| vtsteam:
--- Quote from: awemawson on March 06, 2021, 12:46:47 PM ---Cranking the handle there was an alarming graunching noise in a couple of places, and examining the gear on the handle shaft there is already visible wear and it looks horribly as though it's made from aluminium alloy - surely not :scratch: --- End quote --- Is it? |
| awemawson:
Thanks for that Pete. Yes the worm is far too short and being welded to the spool shaft assembly cannot be moved. It'll just have to wear to it's comfort zone ! So today I welded the crane components together. I consider myself an 'occasional good welder' in the sense that occasionally I can do a good weld :lol: But not consistently, especially on something like this with loads of 'out of position' welds. They are certainly strong enough, just not as pretty as I'd like! The box section is galvanised and I'd thought I'd ground off the zinc where I was welding, but it is obviously much thicker than I thought as it was popping and flaring at times. Not cleaned anything up just now, I wanted to evaluate it on the lathe and see how much twist there is when lifting those two 20 kg weights. Answer surprisingly little :thumbup: I'll sleep on it but at the moment I don't think that it needs further ribs below the base though I have cut a pair of 60 mm diameter fat washers for the 30 mm holding down bolts to spread the load a bit. I was able to lift the pair of weights - totalling 40 kg - without any alarming bends or creaking so at the moment I'm thinking just to clean it up, dress the welds, and move on. The 60 mm thick slice of 170 mm EN24T has arrived to make the chuck adaptor so there's work to do ! |
| awemawson:
Steve, scratching the gear with a scriber I suspect that it is mild steel. |
| vtsteam:
Andrew, it the worm is harder than the wheel and the lead-in of the worm isn't properly relieved and deburred, they won't wear together, the wheel will just keep being cut. Is the start of the worm relieved? |
| Sea.dog:
I'm not sure that I'd like to hang those weights on that arrangement, at least not for very long. I'd feel a lot happier with a double beam at the post end, one above, and one below the pivoting arm. |
| Navigation |
| Message Index |
| Next page |
| Previous page |