Stuart Turner Twin Launch Engine pt 8B - crankshaft

[@modellingmark]

I'm enjoying this series! Lovely work on the twin.

[@robertbriggs8465]

Cheers !

[@WesleyHarcourtSTEAMandMORE]

I'm looking forward to more of your work. Made sure to subscribe to your channel.

[@robertbriggs8465]

Thanks for subbing

[@WesleyHarcourtSTEAMandMORE]

@@robertbriggs8465 you're very welcome. Thank you for sharing!

[@lste]

Hi Rob about machining the main crank shaft diameter I had the same problem albeit on a 6" (half full size) traction engine model Dia around 1.5". I tried a travelling steady without any improvement. I eventually sent it out to a proessional machine shop to have it ground professionally on a cylindrical grinder but they couldn't do it either but they did machine it - kind of! I put the difficulties down to the material - a spheriodal graphite casting. If I was doing it again I would cut it from solid mild steel. (medium, not low carbon)

[@robertbriggs8465]

I don’t mind cast iron but the “skin” can be a pain. Or chilled spots. I’ve also thrown out the textbook figures for speed and feed, running way slower etc. Especially when using a tool with wide contact area - lots of chattering otherwise. Result has been drama-free machining. Good luck with the traction engine!

[@dennythomas8887]

Coming along nicely!

[@robertbriggs8465]

Thanks a lot!

[@Rustinox]

Hi Robert, I just discovered your channel. And of course you have my sub. You're working on a very interesting project here.

[@robertbriggs8465]

Thanks for subscribing and your comment, appreciated!

[@Steviegtr52]

Nice work Robert. I see you are low on subscribers. I have subbed. Will follow the build. Take care. Regards. Steve.

[@robertbriggs8465]

Thanks for that! I’ve only been uploading content for a few months but pleased with progress so far. A lot of the build was done way before I started my videos, I was encouraged to start my channel by others. Thanks again.

[@vincentgruau9684]

beau travail et soigné. j'ai la même passion que vous ! excuser moi, je ne par pas anglais !

[@robertbriggs8465]

Merci monsieur, et moi aussi, je ne parle pas francais tres beaucoup. Merci encore

[@union310]

Looking good

[@robertbriggs8465]

Thanks, I need all the encouragement I can get!