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| Oh Blimey I bought a CNC Lathe !!!! |
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| John Stevenson:
Lovely, brass swarf. Could you separate it ? Tuesday morning started off with a ten foot length of 2 1/4" AF hex brass bar. Thursday dinner finished up with this By the time the tray was cleaned out and put into another bag there was 40 kg according to the scales at the local scrappy. Don't know what it is worth, won't get paid until next week but better than a poke with a sharp stick. |
| Pete.:
Oooh I can feel those little brass splinters from down here in Kent! |
| awemawson:
John, sounds like that job needed to start from brass castings or forgings rather than hex bar ! |
| John Stevenson:
Looked at various options. Casting, solid hex and cored bar. Material cost per piece was £8.00 in hex. this doesn't include the scrap return. Round was dearer as it was larger to take in the hex and cutting the hex was another operation. Cored bar was even dearer than round solid and again more waste. Casting was slightly dearer but the hex would have still needed a finish operation. So the only extra operation needed in the hex was belting a 27mm hole thru and this was done in one pass, no centre operation as if the hole was off centre it got straighten up with the two stepped boring operations to follow. Drilling was done under power by fitting the tailstock in front of the carriage and getting the carriage to push it at scary fast / mm / min. All the OD turning was again done in one pass as the max removed was only 11mm off the diameter so max depth of cut was 5.5mm. This was done with tipped tooling hand sharpened on a diamond wheel to zero rake and the tooling was inserted upside down and the lathe run in reverse. This has the advantage of throwing the chips directly into the tray as opposed to over your shoulder, in your pockets, down your neck and we won't mention foreskins. |
| awemawson:
I got fed up tripping over all the manuals that I'd accumulated during the repair of the Traub, and was about to box them up and put them on top of the machine, however realised they'd get 'orribly grimy and dusty after a few weeks. Then I thought, hang on - how much room is there INSIDE the machine. Originally there had been document pockets on two of the doors, so there were mounting rails comprising two vertical perforated strips already in place, albeit plain untapped holes. |
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