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| Mrs. Robinson, Revisited....... |
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| Stilldrillin:
VT. Thanks for the insulation thoughts. :thumbup: I'll see if I can first, reduce the burner's power somewhat. :scratch: Had another test run today. Just over 1/2 hour. The burner is better, with the choke ring. But, there's still a lot of heat, where it's not wanted. Some lovely colours on the copper chimney! Have started to make another rose. Probably, with 1.5mm holes, over a 3/4" diameter area. Also, ordered a couple of No 3 jets. (One for the Huxtable)....... David D |
| Stilldrillin:
Here's a little conundrum....... The new crankshaft bearings I'd made had too much clearance, on the 6mm silver steel shaft. :( So, I bought some 10mm o/d needle roller bearings. Mounted the pedestal on a mandrel, and recessed each end of the casting bore, to suit. The needle rollers had a bigger wobbability factor than my original bushes!! :bugeye: :bang: :bang: Can't work that out. Am I missing something? :scratch: Managed to locate four ball races. 6 x 10 x 3mm. And these fitted perfectly, in pairs, at either end of the pedestal........ Job's a good un. But, I still can't work out why the rollers seem to be oversize, on the 6mm shaft....... :scratch: David D |
| vtsteam:
Are they quarter inch? |
| Bluechip:
Dave Some needle rollers need to have a specified interference fit to make 'em the right size. As do IIRC Glacier bushes. Also, but I'm not sure about this, some ball-races have polished rings on them. I think this is a similar thing. ie. Interference fit outer, push fit inner etc. etc. etc. Dave BC |
| lordedmond:
As Dave BC says the needle roller bearing need to be pressed in to a a sized hole and must run on a hardened shaft as to the hole size you need the manufactures spec sheet as to the correct hole size for the outer they are designed to shrink down to the correct size. as a side note my dad was a foreman fitter at Stanton central workshops they had made a large ball race made by SKF it was about 36 inch bore , when it arrived a. the bore was to small and b. you could move the inner race inside the outer axially by about 1/8 inch. So on the blower get the rep down here fast this is a load of junk ect. So the rep arrives no the race it to specs , he then had them make up some go logo test bars to his figures , ok get them over the gas heaters until the gauges fitted the bore , pick them up with the crane the slid on the shaft like a well oiled jack boot , when cooled down there was no play and every one was happy and then retired to the Severn Oaks That was the old works pub as the furnace side workers as part of their wages had 8 pint of beer per shift supplied :D Stuart Good work with the engine |
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