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| Building Stuarts Compound Steam Engine |
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| mzt:
Hi Benni, I have ideas that Your method of drilling the bearings worked because You went from 1/4" dia. to a round and straight (as much as reamers would do in those fields) 7 mm in light steps. I had recently tried drilling a (large) split bearing I had bored undersize and then split using the remaing 'oval' as a guide for a larger drill. --> Scrap Next one, I tried milling a square groove on the bearing line, into the two halves. --> Scrap again. What worked for me was milling an identical V groove on both halves of the third workpiece. Not sure I will try Your method on next occasion. Neither sure I won't, though. Nice work, btw. I'll be following this thread. Marcello |
| Stilldrillin:
Those bearings were very nicely done Benni! :clap: :clap: :thumbup: David D |
| sbwhart:
Looking good Benni I,ve bin following along quetly :clap: :clap: :clap: :clap: Stew |
| saw:
The Crankshaft ThanksNickG, mzt, Stilldrillin and sbwhart for nice feedback. You are so right this is not the ordinary way for drilling the main bearings, I tried many different ways and a lot of coffee before I came up with this solution. However it works and that is all that matters, right? Now to the crankshaft, I am sorry, I use to take a lot of picture, but I have forgot some in the beginning. I cut off tree pieces of 8 mm silver steel, one 150 mm, and two 19.1 mm. On the small ones I turned down a 4.95 mm long edge to 7 mm at both ends. Then I cut off four pieces of mild steel... … and market out and drill two holes, one 8 mm and one 7 mm. I drilled undersize and reamed to correct size. Then some turns in the lathe so I could get a smooth radio… … and back to the mil for drilling holes for the pins. After that I assembled all the pieces... … and drilled the holes for the pins, mount the pins and soldered the pieces together. And here we go, we have a crankshaft. I know that many people preform to turn the crankshaft in the lathe, I have tried that a couple of times so I took it safe rather than sorry. So far so god but… :med: I’ll be back |
| NickG:
I like that method, same as I used for the 'poppin' flame lickers although I didn't pin as the power of them is so low. Didn't you fancy trying the cast crank then? Nick |
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