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From: Frank Krygowski <frkrygow@sbcglobal.net>
Newsgroups: rec.bicycles.tech
Subject: Re: Riding after heavy manual labor
Date: Wed, 29 May 2024 14:23:30 -0400
Organization: A noiseless patient Spider
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On 5/29/2024 12:04 PM, Jeff Liebermann wrote:
> On Wed, 29 May 2024 07:45:11 -0500, AMuzi <am@yellowjersey.org> wrote:
> 
>> On 5/28/2024 9:59 PM, Frank Krygowski wrote:
>>> On 5/28/2024 4:10 PM, Tom Kunich wrote:
>>>>
>>>> 2. You believe that a small dent that doesn't actually
>>>> stretch the metal cannot pop back out
>>>
>>> Wait, Tom! Are you _STILL_ claiming your frame tube had a
>>> dent, and your normal riding caused it to somehow cure
>>> itself, that the dent popped back out???
>>>
>>> Wow! That really is one for the record books!
> 
>> Most links are to academic papers with paywall but here's an
>> overview:
>>
>> https://www.britannica.com/science/slip-crystals
> 
> Methinks "cold flow" would be a more applicable mechanism.
> <https://www.merriam-webster.com/dictionary/cold%20flow>
> That's where Tom leans on his bicycle frame, which then slowly flows
> in the desired direction.  How he was able to do this from inside the
> frame tubing is left as an exercise for the believers.
> 
> There is also SMA (shape memory alloy):
> <https://en.wikipedia.org/wiki/Shape-memory_alloy>
> which can be deformed when cold but returns to its previous shape when
> heated, which Tom does with a breath of hot air.
> 
> I really wish that Tom would introduce his amazing technology to the
> automobile industry.  My Subaru has numerous dents from trees and
> branches falling on it during several years of winter storms.  It
> would be really nice if I could just push or heat the dent and have it
> return to its original shape.

Too bad the body panels weren't plastic. Our previous car, a Mazda 3, 
had huge blind spots. Because of those, I was backing _very_ slowly out 
of a very tight parking space in a pedestrian rich area, inching my way 
back as I cut the wheel sharply.

That maneuver put a concrete pedestal in my blind spot the entire way. 
The right rear corner of my plastic "bumper" hit it and got dented in. 
Very embarrassing! My insurance company estimated ~$800 to fix it, and 
because of my deductible sent me a check for $300.

Since it was winter, I delayed the repair but drove with embarrassment. 
But one day when the temperatures got into the 40s, I took a heat gun 
and some rags into the garage. Patiently heating and pressing the plasic 
panel both inside and outside, I managed to push the dent back out 
almost perfectly. A bit of touch up paint covered minor scratches. When 
I traded the car in, not a word was said about the repair. Oh, and I 
pocketed the $300.

It was much, much easier than similar metal repairs I've done. But then, 
I don't have Tom's magic touch.

-- 
- Frank Krygowski