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| Maiwald Makeover....... |
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| fcheslop:
Hi David,you could also use graphite for the piston kind regards Frazer |
| Stilldrillin:
Thanks Nick! I ummed an arred for a while. Then decided to make a new alloy piston, just to see what might happen....... :scratch: Realising there was 4mm spare space below the piston, I made the new one 3mm longer. It stopped with a clunk, at the wear ridge made by the old piston! :bang: So, I shortened it....... It still insisted on hitting the wear pattern! :bang: :bang: So, I built the crank assembly, properly, while I thought about sleeving the cylinder........ The cylinder is 10mm bore, and the bottom of the fins is around 14mm dia. So, I can only afford a cyl. with a wall thickness of1mm. I have ordered a length of cast iron. Fraser. Carbon! That's a great idea....... Until I priced some 3" x 1/2" dia. from Noggin. Hmmm....... I think I'll try a cast iron piston, too! :) David D |
| fcheslop:
Hi David,Try artist supply shops they sell 3 inch lenghts about 3/4 dia for £2 or £3 Iv used it and not had any problems cheers |
| ogaryd:
Hello David D. You know we all have one of these but here's my opinion, Graphite for the piston,it's self lubricating&low expansion. I bought my graphite from ebay, it was sold for stiring sticks for molten gold. Straighten cylinder bore and make piston very close fit. Another trick I learned was to remove shields from roller bearing and clean all grease. That reduces friction a bunch. Just another opinion . I'm enjoying watching your rebuild. Thanks for sharing it with us. Regards Gary :nrocks: |
| Stilldrillin:
Hi Fraser. Thanks for the art supplies tip! I'll have a look, while we're out today. Hi Gary. Thanks for your rebuild/ sharing comments. They're much appreciated....... :thumbup: I've seen the stirring sticks...... At around £12, delivered. Noggin End sell in 3" lengths......... At around £12, delivered. I only need about 1/2"! :bang: Present thoughts, (it's early morning, yet), are to sleeve with thin wall brass tube, and carbon piston. This all could change, of course! David D |
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