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| Scott Vacuum Engine...... |
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| vtsteam:
Verrrrry nice David!! |
| Will_D:
Quote "Normal lathework followed. Finally finishing the o/d between blocks......." So you are just using the friction of the two plastic blocks to keep the head centred? Any extra friction material used? BTW what is the yellow plastic? Very nice work Will |
| Stilldrillin:
--- Quote from: vtsteam on December 04, 2014, 06:47:32 PM ---Verrrrry nice David!! --- End quote --- Thanks, Steve! :thumbup: --- Quote from: Will_D on December 07, 2014, 12:34:46 PM ---Quote "Normal lathework followed. Finally finishing the o/d between blocks......." So you are just using the friction of the two plastic blocks to keep the head centred? Any extra friction material used? BTW what is the yellow plastic? Will --- End quote --- Hi Will. Yes. Just friction....... On this occasion, the disc is nipped between the two blocks. Trued, while rotating, by a piece of wood, held between toolpost and workpiece. Then full pressure applied by tailstock........ The driving block, is faced with a layer of insulating tape. The tailstock block, is slightly relieved in it's centre area. Dunno about the plastic! :scratch: We used it at work, to make buffer bushes, in our rock drilling hammers. It might be the same as gas supply piping....... No need for plastic. Wood will do just as well, as the driver. With a metal "saucer", in the live centre. --- Quote ---Very nice work. --- End quote --- Thank you! :thumbup: David D |
| Stilldrillin:
Steps forward...... Steps backward. But, overall...... :thumbup: Mounted the original c/i piston, on a handy piece of curtain pole, and reduced to fit the new bore. About -5thou from original....... Assembled. But couldn't get the engine to spin freely. Seems the open end of the bore is a little tight. :scratch: So...... Turned another length of curtain pole, to a sliding fit. (After sanding off the fuzz)........ Coated in fine grinding paste. And oscillated for 30mins, or so....... Seems Dave has gripped on the end of the cylinder o/d, in his industrial machine, and triangulated it! :bang: Re assembled, again. Piston/ bore, dry, no oil. shouldn't pick up. Just a quick test run. Twin temporary burners, this time....... Now, I'm confident to carry on modding, to finish, as planned. :D Except...... An hour after running. The piston was stuck in the bore. Again! The dreaded, condensation rust......... Sheesh........ Pleased, the lap is still mounted in the chuck. I can polish the bore, for the new graphite piston. Winter's closing in, on old bones. Not much will be happening this week. Thanks for looking in! David D |
| sbwhart:
"O WOW" indeed :clap: Its getting there Dave :thumbup: Stew |
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