Subject: Spring pin and dowel pin tolerances

From: [email-masked] (Nick Irias)
Date: Mon, 10 Jun 1996 20:18:35 GMT

I need to pin a joint with a small (1/16" to 3/32") pin.  My plan is
to have one piece bored so that it has a loose fit on the pin and can
rotate freely.  The other piece needs to be a tight enough fit that
the pin doesnt come loose.	

Is there a rule of thumb regarding how much a hole should be
undersized for spring pins vs dowel pins?  Also, is lock-tite required
with dowel pins or are they typically just a friction fit?

thanks in advance for any info

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From: [email-masked] (robert a barker)
Date: 11 Jun 1996 21:33:10 GMT

In article <[email-masked]>, [email-masked] says...
>thanks in advance for any info
I would think a dowell pin would be preferable if one part is to rotate.
The fit of the dowell pin depends somewhat on the material of the 
part.But for the size of pin you want to use,I would have a .0005 to .001
interference for *most* steels and .0015 to .002 for *most* non-ferrous.
I would not use loctite under the conditions I have specified.

Hope this helps.

Bob Barker

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From: Bob Unitt <[email-masked]>
Date: Tue, 11 Jun 1996 21:42:59 +0100

In article <[email-masked]>, Nick Irias <[email-masked]>
writes
>with dowel pins or are they typically just a friction fit?

Why not use a taper pin ?

-- 
Bob Unitt

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From: [email-masked] (Edward Haas)
Date: 12 Jun 1996 08:35:32 -0700

--and if the design permits, don't fergit a little bitty hole 
through to the other side, so you can drive the damned things out again, 
if needed, f'rinstance if you want to get a part anodized or if you 
(gulp) do something that needs un-doing...
-- 
	"Steamboat Ed" Haas	:	Another proud member of 	
	COMING SOON		:	The Anti-Virus Vigilanties
	http://www.west.net/~steamer  	
		---Decks a-wash in a sea of words---