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| Maiwald Makeover....... |
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| Stilldrillin:
Thanks for your kind comments, Chaps! :thumbup: Very slow progress, I'm afraid........ I assembled the crank frame with it's three spacers. It's now rigid/ self supporting enough, to file the underside flat, to my surface plate....... Finished the inrigger bearing holders........ Glued into place. Aligned with a length of 4mm silver steel. Positioned outward, by a piece of foam........ Perfectly aligned......... Rebuilt the crank assembly. Installed a temporary flywheel. Oiled round...... And fired up.......... And........ It still wouldn't run! :bang: :bang: David D |
| Dean W:
--- Quote from: Stilldrillin on July 15, 2012, 04:16:18 AM ---And........ It still wouldn't run! --- End quote --- Well, at least it's starting to look a bit more substantial. We know it will run in the end, David, 'cause we have you on the job! :thumbup: How's your supply of sleeve retainer holding out? Dean |
| Stilldrillin:
Thank you Dean, for your confidence in me. :thumbup: Sleeve retainer? Hmmm..... After a very long, successful innings, it's beginning to splutter a little now. :( Guess it's about time for a grovelling pm....... :poke: After the fail, it was water tested. No dramatic bubbles, but some water inside, on stripdown. :scratch: Calculated the ratio..... That's ok at around 6 to 1. Don't like the pifflin', (out of square?), crank throws. So, I started to make another assembly......... I had no 4mm alloy plate. So, had to machine from a 6" long piece, of 40mm dia. bar. I was rather proud of my scruffy little 7 x 12's performance........ Obviously, I parted off between centres. But facing the bar, so far away from the 5" chuck was no problem........ The biggest performance improvement, after the taper rollers, has been the recently fitted steel spacer. In place of the original plastic one. Another really worthwhile improvement! :D David D |
| NickG:
:bang: These engines are so tempremental, if anyone can get them to run better you can though! It just goes to show though, loose is the name of the game with hot air engines, they seem to like a little more clearance than most engines. The crank shaft looks thick enough to me, as you say it's not given enough support by the bearings but your in-riggers should have solved that ... yeah, I reckon the webs are a bit flimsy, with all the flywheel weight on one side it may be skewing it a bit, your new flywheel looks a bit heavier than the other too. Can't believe the swarf ... why on earth would you do that ... even if you were churning thousands out, it just doesn't make sense! |
| Stilldrillin:
The tiny big end bearings came this morning. :thumbup: Two, 4mm thick discs, 16mm dia. drilled through 7mm, and mounted on a mandrel in r/ table....... Application of 4mm endmill........ Drill and tap M3....... Two new big ends, ready for loctiting........ Tiny, fiddly bits n pieces, that won't stay in me fingers. Or on the bench, once they've escaped..... Grumble......... :bang: David D |
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