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Slip fit

bytes2doc

NAWCC Member
Aug 31, 2009
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I'm in the midst of making the motion works on Bill Smith's skeletal clock design. He states there is a slip-fit of the cannon pinon onto the center arbor. I take this a a nice fit but not tight. That being said, then the cannon pinon would just spin on the arbor, so what would drive the motion works? Or does a slip fit mean a tight fit such that the cannon pinon rotates with the arbor?
 

glenhead

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Nov 15, 2009
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By definition "slip fit" means that the pieces join together with no slop and with as little friction as practical. You want the clearance to be about .002" (.05mm) for a 0.25" (6mm) pin joint. With a blind hole a "perfect" slip fit of a cylindrical joint will be one of those where you get that glorious "pop" when you pull the pin out. I don't know the specifics of his build - is there some other doodad that provides the friction necessary to drive the hands, like a domed washer or something? If not then it seems likely that at some point you'll put a dimple in the cannon pinion to provide the friction. Or something,

Hope this helps.

Glen
 

bytes2doc

NAWCC Member
Aug 31, 2009
164
3
18
Tennessee
Country
Region
By definition "slip fit" means that the pieces join together with no slop and with as little friction as practical. You want the clearance to be about .002" (.05mm) for a 0.25" (6mm) pin joint. With a blind hole a "perfect" slip fit of a cylindrical joint will be one of those where you get that glorious "pop" when you pull the pin out. I don't know the specifics of his build - is there some other doodad that provides the friction necessary to drive the hands, like a domed washer or something? If not then it seems likely that at some point you'll put a dimple in the cannon pinion to provide the friction. Or something,

Hope this helps.

Glen
Thanks for the reply Glen. That is what I was thinking and so thought a press-fit would be better. There is a domed washer in the build as I recall, but will check it as I’m heading to the shop now.

thanks again.
 

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