Re: Machine Shop

On Sun, 23 Feb 2025 12:26:43 +0700, John B. <slocombjb@gmail.com>
wrote:

On Sat, 22 Feb 2025 20:10:44 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:
>

On Sat, 22 Feb 2025 20:04:09 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:
>

1095 is considered a
good steel for knifemaking because of it's edge retention.

>
Oops.  I wrote that backwards.  It should be:
>
"1095 is not considered a good steel for knifemaking because of it's
poor edge retention."
>
Maybe good for kitchen knives, most of which do not need a very sharp
edge.

>
https://www.battlebladesinc.com/what-is-it-1095
https://www.sdknives.co.za/product/1095-high-carbon-steel-35mm/?srsltid=AfmBOooRPluStSMjkyguHokJvnEMdU4-XpAeuUHS8AwGU5Qo34-Vz5BJ
https://www.tomtek.eu/product/blade-steel-1-1274-aisi-1095/
https://www.amazon.com/Forging-Annealed-Supplies-Hobbyist-Professional/dp/B0CS2F4QVP
https://forum.spyderco.com/viewtopic.php?t=95943
http://www.htsteelmill.com/1095-carbon-steel.html?gad_source=1&gclid=EAIaIQobChMIieej-__YiwMV_oRLBR2VWCB4EAAYASAAEgL1L_D_BwE
https://www.youtube.com/watch?v=AVH3xQCXdZQ
And that's only the first page :-)
You might want to watch :-)
https://www.youtube.com/watch?v=swkZgWWJ8yA

Thanks.  Very interesting. I really should give up while I'm still
sane.  I yield to your superior expertise and experience in knife
making and steel metalurgy.  In case it's not obvious, I'm a total
beginner with knife make and have limited experience in knife
metalurgy.

I watched both videos and learned a few things.  I have a few "Old
Hickory" kitchen knives. 
<https://ontarioknife.com/collections/old-hickory%C2%AE-1>
I didn't realize that they were made from 1095.  The first video
mentions this:
<https://youtu.be/AVH3xQCXdZQ?t=138>
Much as I like the knives, I need to lightly resharpen them almost
every time I use them.  That's what I mean't by "poor edge retention".
Years ago, I did some tinkering with an Old Hickory paring knife.  I
sharpened it with whetstones to 6000(?) grit and then stropped it.  I
put it under a microscope.  The edge was clean and straight.  With the
blade in a wood vise, I bent the blade back and forth about 10 times.
The microscope now showed some minor edge damage in the bend area.  I
think that's why it needed regular resharpening.

As for the original topic, I think it's safe to say that we have a
consensus that the alleged dent in Tom's bicycle frame did not
magically "pop out" and repair itself.  Once the steel tubing is
stretched beyond the elastic limit, it's considered permanently
deformed and is not going to return to it's original shape.  I also
believe that it's unlikely that any bicycle frame maker is delivering
bicycle frames that are springy enough to recover from permanent
deformation.

Tom:  What was the bicycle manufacturer and model of your miraculous
self-healing bicycle so that I can research the material properties?



--
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558