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| Building a 31/2" Gauge Locomotive Engine |
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| rleete:
Shame to hide that mechanical ballet behind side plates. |
| NickG:
Rleete, you're right, all you see is 3 wheels rotaing either side with a coupling rod! Not as exciting to watch as some engines that have outside wallscharts, lubericators and all the rest of it on view. Still as exciting to drive though. Nick |
| sbwhart:
Her we are again as happy as can be etc etc:----- Whilst I find a suitable motor for my tool post grinder build, I though I'd make a start on the lubricator for my loco. The design as drawn is a ratchet driven osilator pump similar to the little engines we make but instead of driving its driven, so you can use it to pump. I'm going to follow a design recently posted in Model Engineer (22nd May 2009) that uses a much more efficient friction clutch instead of a ratchet and instead of having sprung balls for the none return valve uses a Nitrile rubber valve like the bicycle valves. The first bit I made was the stand. The diagonal groove is where the oil is sucked up into the piston, it then swings over and pump out the other hole on the return stroke. Next bit to be made the piston. Thats it for now dropped on a motor for the post grinder i'll get back to this later. Stew |
| NickG:
Stew, Good planning that, because on mine I noticed the ratchet is configured such that it can only advance 1 tooth each time with full swing on the ratchet arm ... and I mean full swing as something actually gets in the way at the end of each stroke. I'm sure I had problems with this when I ran it on air all those years ago, it will be very difficult to adjust to get it to do that. So I may need a friction clutch too. Yes they are just like a little oscillator working in reverse. Bit like fish tank pumps too. It must be a pretty strong spring though as it has to pump against 80psi of steam. Is there an o ring on the ram? Nick |
| sbwhart:
Hi Nick Yes there is an O ring on the ram the chap who wrote the article recommends getting them from gas fag lighters. Stew |
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