Originally posted by NOCARRIER
This is some pretty neat stuff !
Could you possible shed some light on your venture of bulding a crankshaft grinder. |
Most of the engines call for milling or cutting the journals on the lathe. I did that once and hated the hard interrupted cuts and chatter on my lathe. I also had a hard time getting the counterweight sides cut correctly. Most guys just cut a crank out then bolt on the counterweights, but I want my cranks and cams to be just like modern automotive stuff.
There is a newsletter now out of print called strictly IC that has various plans for making cam and crank grinders. I'm designing my own, but using ideas from some of these. If you do a web search, Bob still sells all the issues, and they are worth the money. I bought every issue ever published.
Basically the grinder is a couple shafts, with the ability to cut on a eccentric. Its really hard to describe though. Take a plate and mount a grinder on it (in my case, a belt driven shaft powered by a Porter Cable router motor). Pivot one end, and the other end is held off the horizontal plane by a micrometer screw. This sets the diameter. Another shaft holds a chuck that can be adjusted off center to get the throws. Another motor turns that shaft. I'm making mine a bit more complex with 3 shafts and the middle one can hold an eccentric pattern so I can use the same tool to cut both Crank journals and Cam lobes. I know I probably just confused you, but like I said, its hard to describe!