johnsmachines

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.

John and John having fun again, on Puffing Billy

Puffing Billy, Belgrave, Victoria

Puffing Billy, Belgrave, Victoria, Australia

Big John and Little John, or Pop John and John John, on Puffing Billy.

Big John and Little John, or Pop John and John John, on Puffing Billy.

CRANKSHAFT, almost finished

The crankshaft is almost finished! It is not perfect, and I am considering making another one. But for a first effort (at a crankshaft machined from solid), it is not too bad.   Actually, it was the second effort.  The first one was binned due to a 3mm eror.

I made the job much more difficult by using stainless steel as the material. Stainless is hard, and must be machined with carbide tooling.  Problems with chatter and tools blunting.  The big ends needed thin tools with a lot of overhang. After my initial unsuccessful effort, a friend suggested the use of a Gibraltar toolpost, which certainly reduced the chatter. (thanks David M).

IMG_2638

Turning the big end bearings, using a carbide parting tool held in “Gibraltar” tool post. Actually, it is an “Uluru” toolpost. Whatever the name, it worked better than the normal quick change toolpost on my lathe.

After an estimated further 12 hours of turning and milling, the crankshaft is almost finished.

IMG_2640

The support blocks glued with Loctite to support the main shaft, are still in place.

 Ahuman hand for scale.  Refer back to the original lump of 50.8,, diameter stainless steel pics to see how much material has been removed, leaving the crankshaft.  I have a large amount of razor wire to dispose of, and many cuts on my hands and face.  This is mongrel material to machine and I hope to never use it again.  At least my crankshaft should not rust.

A human hand for scale. Refer back to the original photos to see the lump of 50.8,, diameter stainless steel  to see how much material has been removed, leaving the crankshaft. I have a large amount of razor wire to dispose of, and many cuts on my hands and face. This is mongrel material to machine and I hope to never use it again. At least my crankshaft should not rust.