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Old 03-09-2011, 06:01 PM
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Question re. shortening nylon cam button

Which end do you guys shorten your nylon cam buttons from? I haven't actually got the button yet (it's in the mail), but they seem to have a convex nose. This being the case, it would seem better to do any filing/grinding on the flat rear face of the button. To keep it flat and level, I thought about mounting it in my drill press (if the chuck will open wide enough) to keep it perpendicular and press it down gently onto some sand paper until it's the correct length. If my drill press can't take the button, I'd have to use a hand drill, but then I couldn't absolutely guarantee keeping the button perpendicular to the grinding surface.

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Old 03-09-2011, 06:39 PM
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Quote:
Originally Posted by v8hed
Which end do you guys shorten your nylon cam buttons from? I haven't actually got the button yet (it's in the mail), but they seem to have a convex nose. This being the case, it would seem better to do any filing/grinding on the flat rear face of the button. To keep it flat and level, I thought about mounting it in my drill press (if the chuck will open wide enough) to keep it perpendicular and press it down gently onto some sand paper until it's the correct length. If my drill press can't take the button, I'd have to use a hand drill, but then I couldn't absolutely guarantee keeping the button perpendicular to the grinding surface.
Did you see my note on two different SBC button lengths .6 and .8 inches? Does .6 fit without shortening? If so this would save you some effort.

You shorten the base which is a double step arrangement where the foot bottoms in the center hole of the gear, the step bottoms against the gear face.

For your viewing pleasure see this link:

http://www.competitionproducts.com/...s/products/463/


Bogie
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Old 03-09-2011, 06:46 PM
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Quote:
Originally Posted by oldbogie
Did you see my note on two different SBC button lengths .6 and .8 inches? Does .6 fit without shortening? If so this would save you some effort.

You shorten the base which is a double step arrangement where the foot bottoms in the center hole of the gear, the step bottoms against the gear face.

For your viewing pleasure see this link:

http://www.competitionproducts.com/...s/products/463/


Bogie
Yea, even a .600" button needs shortening with my thick cast aluminum timing cover.

Ah, that makes sense re. the base. I'll have to shorten from the nose then. How critical is it to get the shape (contouring) perfect? I can't really think why the nylon buttons have that convex crown to them(?)

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Old 03-09-2011, 06:52 PM
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Quote:
Originally Posted by v8hed
Yea, even a .600" button needs shortening with my thick cast aluminum timing cover.

Ah, that makes sense re. the base. I'll have to shorten from the nose then. How critical is it to get the shape (contouring) perfect? I can't really think why the nylon buttons have that convex crown to them(?)

Thanks.
I don't think its that important I just made mine look the same I but a little grease on the end to check for fit!
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Old 03-14-2011, 08:00 PM
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My method for fitting cam buttons.

I have a very simple, idiot proof method I come up with for fitting cam buttons. I tape a 3"x3" piece of .005 shim stock on the inside of my heavy duty timing cover where the cam button would contact the cover. I stick a 3/4" ball of play dough on cam sprocket where the cam button would go. I install the timing cover with gasket. Then I remove the timing cover. The next day I pull the hardened play dough off the cam sprocket. This is a perfect model for your cam button. It has the .005 clearance built in. I take the cam button and the play dough model to the machine shop. They duplicate the model in about 10 minutes. This method works perfect every time!
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