Engines > Your Own Design
Scotch All Round
PaulR:
I've been drawing up 2D CAD plans for my next build and although the plans aren't quite finished yet I think the essential dimensions are all ok so I made a little start on the frames. If it comes together it'll be a double-acting twin cylinder engine with spool type valves with Scotch yokes turning the crank and controlling the valves. It' be a simple 'blocky' bar stock build using just the lathe and a rubbish drill press with dodgy machine vice and definitely no adhesive or soft soldering like last time!
I'd forgotten how difficult it is to get a series of holes lined up without a mill or some other traversing device. I was fighting a machine vice that doesn't want to hold anything parallel to the drill table and a quill that seems like it's a bit wobbly or misaligned too! Anyway, in the end they didn't come out too badly, only one is a fraction adrift (well two because I stuck the frames together and drilled them in one go) and given that they're clearance holes for screws or non-critical parts to be soldered in they'll stand a little fettling if necessary. For scale, the steel is 1/2" x 1/4" thick and 134mm long.
This could be the most boring photo on the entire forum but I have to start somewhere :ROFL:
PaulR:
Faced the 4 cross-member/steam passage things to length and turned down the ends of the first one.
paul gough:
Sounds interesting. Hope to see a sketch soon. Regards, Paul Gough.
wagnmkr:
Ya had me at "Scotch" :)
:cheers:
PaulR:
--- Quote from: paul gough on February 24, 2025, 07:17:29 AM ---Sounds interesting. Hope to see a sketch soon. Regards, Paul Gough.
--- End quote ---
I think my CAD skills are a bit lacking/unconventional but if it's a runner I'll definitely post the plans here... I'd rather make sure it works before encouraging anyone else to start making swarf! :Lol:
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