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Joint Project - Building two little Elmer #25 engines

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raynerd:
Tim - I`ll take plenty more pics but your embarrass me with how amazingly clear they are! Talking of a video - have you taken one of your yet?

Stew - I couldn`t have done half the processes that I am now learning without this forum -  :mmr:  I asked tones of questions when I first joined but it was all so overwhelming - key skills, milling, drilling, turning, marking out...etc are a little tricky to source the basics as you guys tend to ask more advanced questions on forums - not the basics. I think you only truly appreciate and begin to understand these skills when in practice in the workshop.

It was my first attempt at silver soldering - the steel screw into the brass cylinder was no problemo however when putting the steel pin into the ally crank I ended up melting and warping it! Is it just a case of being careful or is there some way of preventing this from happening.

All the best
Chris

sbwhart:
Chris

Silver soldering in ally is a no no, the best way would be high strength loctite.

Stew

raynerd:
Ahh - would make sense - the crank totally lost its shape. I`ll know for next time.

Just as a little extension - would it be possible when complete to turn these back to back - join the cranks of both onto either side of one flywheel and off-set the pistons so it would be working as a twin cylinder engine. Just an idea?  

Bernd:
Chris,

Something like this perhaps?



This is Elmers #9 H Twin.

Regards,
Bernd

raynerd:
Haha - fantastic, Bernd! It is basically exactly what I described, infact Elmer 25 design back to back!!

You know the off-set, I`ve been thinking about this and is it quite simply set so that when one piston is out and at the furthest point on the crank the other will be at its lowest point? - 180 deg. I`m sure I read somewhere that is was 90deg off-set but I can`t get my head around that.

Chris

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