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Cam Grinding


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Old 12-24-2018, 11:54:47 AM
ronm ronm is offline
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Default Cam Grinding

G. Britnell, or others...
How do you grind cam lobes for an IC engine? I've been just doing it freehand (trial & error) on my tool grinder, then polishing on the lathe, with OK (variable) results, but it's easy to over-grind & make scrap...
I've seen dedicated cam grinding fixtures in Strictly IC mag, has anybody made these or something similar? I kind of hate to spend a bunch of time on a fixture for 1 intake & 1 exhaust...
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Old 12-24-2018, 01:32:48 PM
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Default Re: Cam Grinding-

were you thinking of single cyl. low speed engines or more like a four cyl. with cams integral and ground on the cam shaft?
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Old 12-24-2018, 05:34:06 PM
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Default Re: Cam Grinding-

I know just enough about automotive cam grinding to get myself in trouble, its a science and art. So on miniature engines how critical is the cam? Could you just do offset lobes on a lathe, or do they need the proper cam profile? I've seen a cam grinder in action, long long time ago, they sold it about 3 months after I started working at the place. So how do modelers do multi cylinder engine cams?
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Old 12-25-2018, 12:46:59 PM
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Default Re: Cam Grinding-

Merry Christmas! more to come, maybe a pic...
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Old 12-25-2018, 04:08:21 PM
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Default Re: Cam Grinding-

Not knowing if/when G. Britnell will see this I figured I'd pull up one of his videos where he makes a camshaft on his mill with a rotary table.



And a couple/few other videos showing different methods.





This one would be a Lot Better if he didn't click on YouTube's "stabilizing" button which distorts the whole video trying to correct what it perceives to be camera shake.




This One might be your best bet using a lathe and a fairly simple fixture with a degree wheel on it.


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Old 12-25-2018, 05:32:44 PM
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Default Re: Cam Grinding

Interesting, miniature cam grinders! Hmm, friend gave me a too incomplete to be usable little mini lathe last year, maybe I'll get to play with it after all.
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