| Author |
Message |
    
07xb12ss
| | Posted on Tuesday, February 01, 2011 - 10:30 pm: | 
|
Is that Red Green approved duct tape? |
Bwbhighspl
| | Posted on Tuesday, February 01, 2011 - 10:40 pm: |
|
Yes, it is approved duct tape. It's the only thing that can provide the type of support for the adamantium I'm using. |
Father_of_an_era
| | Posted on Wednesday, February 02, 2011 - 01:07 am: |
|
You guys are hilarious! Got me busting the stitches over my brow. Love the hanger! Great stuff... |
Froggy
| | Posted on Thursday, February 03, 2011 - 05:20 pm: |
|
 |
Lovedabueller
| | Posted on Thursday, February 03, 2011 - 06:32 pm: |
|
Lmao 95 |
Blake
| | Posted on Friday, February 11, 2011 - 01:29 pm: |
|
I scribbled the calcs and FBD out on some note paper when I was in Dallas, and am not sure where they went to. The calcs for load on the top triple clamp showed right near 2,000 LBs acting in-plane upon the steering stem there, 1,000 LBs at each fork leg. That was for a GVWR 1g stop, forks fully compressed, no load due to bump in road or the like.
So you have 1,000 LBs of shear across any section of the clamp combined with quite a bit of bending, a maximum of around 5,000 LB*IN (417 LB*FT).
Add to that the fatigue requirement and it's easy to see why all OEM triple clamps are either solid beam or very well-trussed type designs.
You just don't see any with big gaping holes as we've seen here. They break.
Note, I didn't even include the out of plane loading, nor any other likely load input such as bumping into something like a curb or the bumper of a car, or a bump in the road. That would only make the situation much worse. |
Fast1075
| | Posted on Friday, February 11, 2011 - 04:47 pm: |
|
Suzuki could have used some of that advice for their gixxer frames a few years ago. |
Bwbhighspl
| | Posted on Friday, February 11, 2011 - 08:11 pm: |
|
Hey Blake,
Could you run your calculations on my triple clamp? Some of the specs may be difficult to find, but the manufacturer, Department K (a Canadian company), assures me that the metal is completely indestructible.
I hope it's no bother, and I'd really appreciate it. Thanks! |
Buellrider66
| | Posted on Saturday, February 12, 2011 - 08:36 am: |
|
Just to get closer to the 100 post mark, the new GSXR6 was completely gone over to save weight. Only SIX parts on the bike remained intact.
You guessed it, one of left alone parts was the triple clamp.
source CycleWorld March 2011
(Message edited by buellrider66 on February 12, 2011) |
Lovedabueller
| | Posted on Saturday, February 12, 2011 - 09:08 am: |
|
 . SWEET 100 posts |
Froggy
| | Posted on Saturday, February 12, 2011 - 09:40 am: |
|
Damn it I was gonna lock it once it hit 99, but I took too long.  |
Lovedabueller
| | Posted on Saturday, February 12, 2011 - 09:44 am: |
|
LMAO |
Court
| | Posted on Saturday, February 12, 2011 - 09:52 am: |
|
Hahahaha . . . and still begging for an ounce of content!
Go internet ! |
Blake
| | Posted on Saturday, February 12, 2011 - 10:20 am: |
|
Splr,
What is your name? I don't like talking to folks who won't even share a first name.
As to your request, beyond estimating the loading requires detailed geometry, finding margins of safety requires material specifications and even a credible definition of the applicable fatigue load spectrum.
It is not trivial.
So beyond basic shear and bending stresses, I gotta beg off.
There's also the issue of adding the hoop stress of the clamping action around the forks to stresses from the loads. It turns into a lug analysis. You can find that in the NASA Structures manual available online. I've done it dozens of times, but it's not at all trivial.
It would be very informative to folks to see what all goes into the design and engineering of such a small part. Most folks would be astounded I think.
Just coming up with reliable loads is not trivial.
Most engineering failures are due to a lack of imagination, failing to imagine the load case that governed the design. Tacoma Narrows Bridge, both space shuttle failures, the Boston tunnel collapse, those were all due to a failure to imagine. If you don't know the worst case load environment, you won't design for it, when the structure encounters it, bad things happen. |
Court
| | Posted on Monday, February 21, 2011 - 09:34 am: |
|
>>>So beyond basic shear and bending stresses,
That's what I thought too . . . but, I confess, this thread got me thinking and off to the engineering library I went.
I had what, at least what I thought, was a pretty good intuitive sense of the loads that the triple clamps, top and bottom, see. Turns out my "seat of the pants" had left me down. I was aware of the more apparent loads but had missed the ones that designers have to account for.
Darned interesting stuff . . . and, as in so many cases, amidst all the pissing and moaning . . . I learned something. |
|
