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| Maiwald Makeover....... |
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| Stilldrillin:
Well, here we go again! :) Another frail orphan, from my toy cupboard. This is a James Maiwald hot air engine. It came to me at the end of 2009. It isn't well! The main bearings are too far apart, and the flimsy crank is flexing. :bang: This is the best it has ever run....... My thoughts are to fit an extra pair of bearings, held closer in to the crank throw. Also, I thought it's flywheel looked better on my Maiwald flame licker. So, it was cannibalised. Removing the bearings proved a struggle. The frames are laser cut, and the bearings were just rammed in, much too tight..... A pair of inriggers. The excess material will be removed later....... A bit of a shock, finding swarf in the displacer pot! Impacted onto the brass bush. Very poor workmanship.......... This was the state of play, at today's knock off........ More to come, as and when. :thumbup: David D |
| Stilldrillin:
After giving this thing a good coat of looking at, I decided it was much too wide....... So, I reduced the alloy spacer by 10mm per side, to 48mm. Extended the thread on the beam pivot shaft. Then screwed on two nuts, and faced to make 48mm spacer rod. The frame relied on the wooden base, to hold it all square. Drilled the frames for an extra 48mm spacer shaft, to triangulate and make it self supporting....... The beam pivot bearing had also seized. Turned an alloy bush, with a slight positioning step........ To hold it central........ The alloy big end/ crank assembly is much too flimsy. But, I'll give it one more chance...... Rebuilt it, using my favourite sleeve lock, at each end of the crankpin....... Progressing, steadily! :thumbup: David D |
| Rob.Wilson:
Looking Good David :thumbup: I bet deep down you smile when you come across "very poor workmanship" :med: Rob |
| sbwhart:
missed the start of this one interesting looking engine Dave, I think I'll be using some of your fix it methods on the simplex Keep up the good work with the orphans Stew |
| Dean W:
I like the looks of the model. Hard to imagine how they could leave so much swarf in that cylinder! Gosh, that's bad. Looks like they had a nice model concept and then focused on cutting corners. The size of the holes in the upright supports for the crankshaft could have taken bearings that would allow a larger diameter crankshaft. I'm glad you are on the job so the poor thing can get (re)built right. I know it will be something special when you finish with it! |
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