Posted by Oscar_Lives on May 3, 2010, 9:51 pm
> The Older Gentleman wrote:
>>
>>> I think he means something else. Flat washers usually have more contact
>>> area on one face, and somewhat rounded edges on the other. Are link
>>> clips the same way?
>>
>> Not that I've seen
> In case it wasn't clear, Beryl was talking about the edge formed during
> stamping. I'm pretty sure master link spring clips are made by stamping.
> http://www.suwaprecision.com/Metal_Stamping_Articles/blanking.html :
> ======================================================================
> Unlike machining, the surface finishing of the cut face is not uniform.
> There are:
> * Penetration - part of the material which has been pushed in by the
> punch
> * Sheared face - face which has been sheared by cutting edge pushing
> into the material. This face is burnished, smooth and shiny.
> * Fractured face - face which has split due to crack development. This
> face is uneven and rough.
> * Burr - Sharp protrusion produced by the crack generated. This is
> located at the side of the workpiece where the cut is completed.
> ======================================================================
> There's a JPG showing the cross section of the stamped part, with a
> detail showing the burr, etc.
> http://www.suwaprecision.com/images/metalstamping/shear_cut_face.JPG
> I would try to put the "square" edge of the spring clip so it is pushing
> outward against the groove in the pins, rather than the rounded edge.
BINGO!!!
Mark gets the cigar!!!
Thanks for the awesome explanation!!!
Posted by Beryl on May 4, 2010, 8:50 pm
Oscar_Lives wrote:
>> The Older Gentleman wrote:
>>>
>>>> I think he means something else. Flat washers usually have more contact
>>>> area on one face, and somewhat rounded edges on the other. Are link
>>>> clips the same way?
>>> Not that I've seen
>>
>> In case it wasn't clear, Beryl was talking about the edge formed during
>> stamping. I'm pretty sure master link spring clips are made by stamping.
>>
>> http://www.suwaprecision.com/Metal_Stamping_Articles/blanking.html :
>> ======================================================================
>> Unlike machining, the surface finishing of the cut face is not uniform.
>> There are:
>>
>> * Penetration - part of the material which has been pushed in by the
>> punch
>> * Sheared face - face which has been sheared by cutting edge pushing
>> into the material. This face is burnished, smooth and shiny.
>> * Fractured face - face which has split due to crack development. This
>> face is uneven and rough.
>> * Burr - Sharp protrusion produced by the crack generated. This is
>> located at the side of the workpiece where the cut is completed.
>> ======================================================================
>>
>> There's a JPG showing the cross section of the stamped part, with a
>> detail showing the burr, etc.
>>
>> http://www.suwaprecision.com/images/metalstamping/shear_cut_face.JPG
>>
>> I would try to put the "square" edge of the spring clip so it is pushing
>> outward against the groove in the pins, rather than the rounded edge.
>>
>
>
> BINGO!!!
>
> Mark gets the cigar!!!
>
> Thanks for the awesome explanation!!!
My clip is stamped <http://img72.imageshack.us/img72/2526/masterclip.jpg>
and has most of the features shown in suwaprecision.com's jpg...
including the fractured squared edge side being a bit smaller than the
sheared rounded edge side. So, it's not going to sit as deep in the
groove. I think I'll put the sheared edge out.
Whichever way you prefer to do it, my clip, I'll guess all clips, was
stamped TWICE, from opposite directions. The inside cut, where it
matters, is exactly opposite the perimeter of the clip.
Posted by No Spam on May 5, 2010, 10:18 pm
4b78-a6c7-f31c1fb05552@s2g2000yqa.googlegroups.com:
> So, I got the axle aligned and tightened, chain back on with just an
> inch or so of slack on the bottom side, put the clip on the link, and
> again, a little pressure on the chain and plop, on the ground. The
> clip was a little bent, wtf?
>
The clip should be replaced any time it is bent or has any
looseness/movement at all after being installed. They are easily damaged
during removal, which is why it's fairly common to run into folks who
say, "Never try to re-use one."
regards,
Joe
Posted by . on May 6, 2010, 9:22 am
> > So, I got the axle aligned and tightened, chain back on with just an
> > inch or so of slack on the bottom side, put the clip on the link, and
> > again, a little pressure on the chain and plop, on the ground. The
> > clip was a little bent, wtf?
> The clip should be replaced any time it is bent or has any
> looseness/movement at all after being installed. They are easily damaged
> during removal, which is why it's fairly common to run into folks who
> say, "Never try to re-use one."
I've installed brand new clips that weren't flat, one leg was slightly
bent. I figured that the clip was engineered that way.
I used to lose masterlink clips on the race track and some racers were
safety wiring the clips. The pressed on side plate would never come
off though.
I started degreasing the clip and the side plate and applying a drop
of red Loctite and I haven't lost a clip 25 years....
Posted by The Older Gentleman on April 27, 2010, 4:59 pm
> The Older Gentleman wrote:
> >
> >> I would imagine that if it is low geared like most, it won`t be as bad as
> >> that. I almost always jump up one tooth on every thing but a racer for
> >> easier revs at speed anyway. haven`t had one be too over geared yet.
> >> Usually gives some milage improvement also. KB
> >
> > It might, yes, on some low geared bikes, but a 1992 750 (whatever it is)
> > is unlikely to be that.
> >
> > One tooth, yeah, done it myself. Two teeth? Geddoudahere.
>
> Some plonker put a 17T front on my CM400T, stock is 16T. Totally screwed up
> the bike. The thing ran sweet as can be once it was returned to stock. With
> the larger sprocket, there wasn't a good gear to be in, I was constantly
> having to swap between 4th and 5th.
>
> There are a lot of people who think it's automatically true that lowering RPMs
> is better. There's a good reason why the engineers who picked the ratios
picked
> the ones they did. And it is not true that lowering RPMs at cruise always
> results in better gas mileage.
I've done it twice. Once, 30 years ago, when I bought a CB750F - the
first slab-sided 'Super Sport' SOHC CB750. Horrible thing. A really,
really nasty underdeveloped bike.
Anyway, it would spin straight to the redline in top, and I discovered
Honda had actually geared it down for acceleration. The gearbox sprocket
from a K4 had one more tooth, and made the bike far more pleasant to
ride and aided mpg.
I did the same thing with my late-1980s Yamaha RD350F2 power-valve. That
would also spin to the redline in top. Going up one tooth on the gearbox
sprocket did, in fact, increase the top speed (ISTR Performance Bikes
doing the same mod and getting 127mph out of the thing!) but it changed
the 'dead zone' (where the power valve couldn't decide whether to open
or not) from an indicated 70 mph to an indicated 75-80, which made the
thing, on UK roads, a PITA.
I put it back to stock. I've still got that extra sprocket in a box
somewhere.
My Ducati (currently awaiting fuel tank surgery) is overgeared in top -
it would theoretically redline at 150 in top. I've often thought of
gearing it down to make it snappier, but I actually like the loping
V-twin gait, so I've left the gearing stock.
--
BMW K1100LT Ducati 750SS Honda CB400F Triumph Street Triple
Suzuki TS250ER GN250 Damn, back to six bikes!
Try Googling before asking a damn silly question.
chateau dot murray at idnet dot com
>>
>>> I think he means something else. Flat washers usually have more contact
>>> area on one face, and somewhat rounded edges on the other. Are link
>>> clips the same way?
>>
>> Not that I've seen
> In case it wasn't clear, Beryl was talking about the edge formed during
> stamping. I'm pretty sure master link spring clips are made by stamping.
> http://www.suwaprecision.com/Metal_Stamping_Articles/blanking.html :
> ======================================================================
> Unlike machining, the surface finishing of the cut face is not uniform.
> There are:
> * Penetration - part of the material which has been pushed in by the
> punch
> * Sheared face - face which has been sheared by cutting edge pushing
> into the material. This face is burnished, smooth and shiny.
> * Fractured face - face which has split due to crack development. This
> face is uneven and rough.
> * Burr - Sharp protrusion produced by the crack generated. This is
> located at the side of the workpiece where the cut is completed.
> ======================================================================
> There's a JPG showing the cross section of the stamped part, with a
> detail showing the burr, etc.
> http://www.suwaprecision.com/images/metalstamping/shear_cut_face.JPG
> I would try to put the "square" edge of the spring clip so it is pushing
> outward against the groove in the pins, rather than the rounded edge.