Crankshaft grinding machine - GIF

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Aug 8, 2023, 03:42 PM
Altair

Crankshaft grinding machine - GIF

Crankshaft grinding machine.

<video controls autoplay loop> <source src="https://diqn32j8nouaz.cloudfront.net/crankshaft_grinding_machine_jl23.mp4" type="video/mp4"> Your browser does not support the video tag. </video>

Previously:

https://www.homemadetools.net/forum/...733#post193938
https://www.homemadetools.net/forum/...836#post179135
https://www.homemadetools.net/forum/...771#post223547
https://www.homemadetools.net/forum/...920#post224005
https://www.homemadetools.net/forum/...524#post225255
Aug 9, 2023, 05:02 PM
nova_robotics

That's interesting. It's a mechanical follower and not CNC.
Aug 10, 2023, 07:32 AM
piper184

A long time ago I watched a small automotive machine shop setup and grind a crank. It did not have the follower. The operator had to dial in each set of journals. Once everything was running true, the grinding wheel was moved from journal to journal. I think he did the mains first, then the offsets for the pistons. It would take a day or more to get a crank turned back then.
Aug 10, 2023, 08:04 AM
nova_robotics

Quote:

Originally Posted by piper184

A long time ago I watched a small automotive machine shop setup and grind a crank. It did not have the follower. The operator had to dial in each set of journals. Once everything was running true, the grinding wheel was moved from journal to journal. I think he did the mains first, then the offsets for the pistons. It would take a day or more to get a crank turned back then.

Yeah I've been thinking about this after I wrote it. There's no way a mechanical follower would work. You'd end up with an egg shaped crank because of the backlash on each direction change. The video above is what you described.
Aug 10, 2023, 08:42 AM
hemmjo

Quote:

Originally Posted by piper184

A long time ago I watched a small automotive machine shop setup and grind a crank. It did not have the follower. The operator had to dial in each set of journals. Once everything was running true, the grinding wheel was moved from journal to journal. I think he did the mains first, then the offsets for the pistons. It would take a day or more to get a crank turned back then.

They way you saw it was the right way to do it. There are so many ways that orange machine could mess up a crankshaft. I am sure the crank would be pretty when it was finished, but any error that previously existed in the journal would still exist, plus any new errors the follower introduces.