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March 1999

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Subject:
From:
"Stephen R. Gregory" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 10 Mar 1999 11:03:42 EST
Content-Type:
text/plain
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In a message dated 3/10/99 3:17:39 AM Pacific Standard Time,
[log in to unmask] writes:

<< Steve,
 Are you changing out the chain as well as the sprockets? Depending on
 the load on the chain, it will stretch and need to be replaced. There
 should be a spec on the allowable % elongation on the chain. What our
 maintenance department will do is remove a link or two. The problem
 is, the pitch of the chain will no longer match up to the pitch of the
 sprocket. This will cause wear on the sprocket. Measure the chain and
 replace it at the same time as the sprocket.
 Regards,
 Scott B. >>

Hi Scott!

    Well, I don't think we are...the same chain is still on right now. Being a
motorcycle rider for the last 20 or so years, that's what I've always done
whenever I needed to change anything on the final drive of my Sleezuki Kana-
tuna. If anything needed changing, everything got changed...the drive
sprocket, the rear wheel sprocket, and the chain. Because it's exactly like
you said, to do otherwise causes premature wear. But then again, my wave
solder isn't cooking along at 100mph (did I say that?...not me, I only do
55mph just like the signs say  B^) ...)

    I passed on to Jorge what had happened and what I had done to the machine.
When I had the chain off before he got here, I did go thru each inch of the
chain to check for binding links. I found some that were a little more
resistant to movement than the others, but not what I would consider really
binding...I mean the links would move easily under the weight of the chain as
I was going through each section.

    The manual doesn't have any spec. for chain stretch or anything close to
it...not even a tension setting. But I did measure the chain and a brand new
drive sprocket this morning with a set of Mitutoyo calipers. I'll fess-up and
admit that I probably was shooting spitwads during my geometry class during
school (and my math class, and english, and...) so I don't know how to
determine if the chain has stretched so much that I shouldn't be using it. But
here's what I measured (the ranges are because I took numerous measurements
and these were the hi and low):

Chain
Space between rollers:                                                                                                                                          .201" - .2045"
Roller diameter:                                                                                                                                                                .300" - .302"
Link length (outside of one roller to the outside of the next roller):  .7935"
- .797"

10-tooth Sprocket
Diameter (Tooth-tip to tooth-tip):              1.850"
Pitch (Tooth-tip to tooth-tip):                 .550" - .555"

So, how would I determine what was too much stretch?

-Steve "I shoulda paid attention in school" Gregory-




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