machines which I have made, am making, or intend to make, and some other stuff. If you find this site interesting, please leave a comment. I read every comment and respond to most. n.b. There is a list of my first 800 posts in my post of 17 June 2021, titled "800 Posts"
CRANKSHAFT – early steps
The triple expansion steam engine crankshaft has 6 main bearings, 3 big ends, and 4 positions where eccentrics attach.
It is about 240mm long, machined from 50.8mm mild steel rod.
The mains are turned from centrally positioned centres, the big ends from eccentrically positioned “centres”.
The centres were drilled on the CNC milling machine, after the locating the top of the bar
The eccentric centres were calculated, and drilled using CNC to get the positions. The longitudinal scribed line was used to position the other end of the rod.
Turning between centres, using a lathe dog. This will not be a quick job.
And this is how I would like to make a crankshaft…