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Cranks Unfixed, or "Why? cause I kin break stuff up, thas why!"
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Doug Cimperman
Oct 8, 2012, 2:59:01 PM10/8/12
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I got really bored today and decided to push the spindle out of the
offending 2-piece cranks. It took about 1 ton to get it out.
http://www.norcom2000.com/users/dcimper/assorted/inanities/recumbent/cranks/loose01.html
The first (unnumbered) pic is the original I posted. First I tried
pushing the spindle further into the crank (from the crank's visible
side) to see if it would tighten up again. The spindle moved in about
maybe 1/4-mm, but it was still slightly loose as before.
Pic #1 shows the two apart. When I first found the crank a tiny bit
loose I kinda panicked and stopped riding it, but that wasn't necessary.
With these cranks the fattest end of the spindle is outside, so it would
be a while before there was any risk of the crank falling off. The right
crank-arm end would move maybe .5mm in-and-out. When on the big
chainring the chain would rub a bit on the derailleur, which is how I
noticed the issue.
Pic #2 shows the spindle damage I found. Point A is thicker than point
C, but point B is in-between A and C. This is where the drive-side
bearings sat. I threw the BB away without really looking at it, so I
dunno what was going on in there. It was pretty stiff though. ...Also we
note that there IS no silver-smooth area where the non-drive-side BB
bearing was.
Pic #3 is an attempted close-up of the crank hole.... Point A shows tiny
dents that were on all the corners on one side of the outside of the
splines here. I dunno if I did that while pushing the spindle in first,
but I doubt it. The spindle splines are still perfectly formed.... Point
B looks like a ratchet tooth, but it's not--it shows tiny "ramps" of
aluminum that were pushed out of the bottoms of the splines.
The black stuff in the splines is grease (present during assembly) that
was really, really hard to clean off. I don't know WTF it was, but if it
hit anything dry it wanted to stick permanently.
offending 2-piece cranks. It took about 1 ton to get it out.
http://www.norcom2000.com/users/dcimper/assorted/inanities/recumbent/cranks/loose01.html
The first (unnumbered) pic is the original I posted. First I tried
pushing the spindle further into the crank (from the crank's visible
side) to see if it would tighten up again. The spindle moved in about
maybe 1/4-mm, but it was still slightly loose as before.
Pic #1 shows the two apart. When I first found the crank a tiny bit
loose I kinda panicked and stopped riding it, but that wasn't necessary.
With these cranks the fattest end of the spindle is outside, so it would
be a while before there was any risk of the crank falling off. The right
crank-arm end would move maybe .5mm in-and-out. When on the big
chainring the chain would rub a bit on the derailleur, which is how I
noticed the issue.
Pic #2 shows the spindle damage I found. Point A is thicker than point
C, but point B is in-between A and C. This is where the drive-side
bearings sat. I threw the BB away without really looking at it, so I
dunno what was going on in there. It was pretty stiff though. ...Also we
note that there IS no silver-smooth area where the non-drive-side BB
bearing was.
Pic #3 is an attempted close-up of the crank hole.... Point A shows tiny
dents that were on all the corners on one side of the outside of the
splines here. I dunno if I did that while pushing the spindle in first,
but I doubt it. The spindle splines are still perfectly formed.... Point
B looks like a ratchet tooth, but it's not--it shows tiny "ramps" of
aluminum that were pushed out of the bottoms of the splines.
The black stuff in the splines is grease (present during assembly) that
was really, really hard to clean off. I don't know WTF it was, but if it
hit anything dry it wanted to stick permanently.
thirty-six
Oct 8, 2012, 3:52:23 PM10/8/12
to
On 8 Oct, 19:59, Doug Cimperman <dcim...@norcom2000.com> wrote:
> I got really bored today and decided to push the spindle out of the
> offending 2-piece cranks. It took about 1 ton to get it out.
>
> http://www.norcom2000.com/users/dcimper/assorted/inanities/recumbent/...
> I got really bored today and decided to push the spindle out of the
> offending 2-piece cranks. It took about 1 ton to get it out.
>
my cup when was considering the idea. He drew out the plan with 20
radials. Regina agreed with little spider.
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