Cycling without an axe

https://bikerumor.com/2021/02/16/man...d-be-too-easy/


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On Thursday, February 18, 2021 at 11:37:10 AM UTC-8, AMuzi wrote:
https://bikerumor.com/2021/02/16/man...d-be-too-easy/

Can you think of anything more dangerous to fall down on?

On Thu, 18 Feb 2021 13:36:51 -0600, AMuzi wrote:

https://bikerumor.com/2021/02/16/man...d-be-too-easy/

Very clever and nicely done. Looks like the rear derailleur is
(almost) leaning against the rear blade. I had to ponder why he had
the saw teeth facing different directions on the front and rear
wheels. The teeth provide propulsion when facing one direction, and
braking when facing the other. So, the only brake that actually works
is the front wheel. I'm not sure, but I can't seem to find a rear
disk brake cable.

The saw blades are probably not real saw blades. If you look closely
at the teeth (03:50), they are not beveled and offset as they would be
on a cross-cut blade. Even a lumber milling blade, which has straight
across (no bevel) teeth, has a slight offset. The blade surface does
not appear to be hollow ground for sawdust relief. My guess(tm) is
the saw blades were laser or waterjet cut to the desired shape. Real
26" dia saw blades are NOT cheap ($1,000/ea):
https://www.amazon.com/Popular-Tools-NF2612-Non-Ferrous-Teeth-165/dp/B004RIWA8Q
Much cheaper used (about $175/ea):
https://www.ebay.com/b/Sawmill-Blade/13875/bn_59489360
but still more expensive than having them laser or waterjet cut.

No fenders?


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

On Thursday, February 18, 2021 at 4:38:12 p.m. UTC-5, wrote:
On Thu, 18 Feb 2021 13:36:51 -0600, AMuzi wrote:

https://bikerumor.com/2021/02/16/man...d-be-too-easy/

Very clever and nicely done. Looks like the rear derailleur is
(almost) leaning against the rear blade. I had to ponder why he had
the saw teeth facing different directions on the front and rear
wheels. The teeth provide propulsion when facing one direction, and
braking when facing the other. So, the only brake that actually works
is the front wheel. I'm not sure, but I can't seem to find a rear
disk brake cable.

The saw blades are probably not real saw blades. If you look closely
at the teeth (03:50), they are not beveled and offset as they would be
on a cross-cut blade. Even a lumber milling blade, which has straight
across (no bevel) teeth, has a slight offset. The blade surface does
not appear to be hollow ground for sawdust relief. My guess(tm) is
the saw blades were laser or waterjet cut to the desired shape. Real
26" dia saw blades are NOT cheap ($1,000/ea):
https://www.amazon.com/Popular-Tools-NF2612-Non-Ferrous-Teeth-165/dp/B004RIWA8Q
Much cheaper used (about $175/ea):
https://www.ebay.com/b/Sawmill-Blade/13875/bn_59489360
but still more expensive than having them laser or waterjet cut.

No fenders?


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

The video shows him building the wheels. He unpackages the saw blades at 3:22. At first the saw blade teeth cut through the ice 4:32. Then he added something to each tooth to prevent them from digging into the ice too far 4:46. At 4:49 you can see that both wheels now have to saw teeth facing forward at the top of the wheels.

The second test ride was a success.

Cheers

On 2/18/2021 3:38 PM, Jeff Liebermann wrote:
On Thu, 18 Feb 2021 13:36:51 -0600, AMuzi wrote:

https://bikerumor.com/2021/02/16/man...d-be-too-easy/

Very clever and nicely done. Looks like the rear derailleur is
(almost) leaning against the rear blade. I had to ponder why he had
the saw teeth facing different directions on the front and rear
wheels. The teeth provide propulsion when facing one direction, and
braking when facing the other. So, the only brake that actually works
is the front wheel. I'm not sure, but I can't seem to find a rear
disk brake cable.

The saw blades are probably not real saw blades. If you look closely
at the teeth (03:50), they are not beveled and offset as they would be
on a cross-cut blade. Even a lumber milling blade, which has straight
across (no bevel) teeth, has a slight offset. The blade surface does
not appear to be hollow ground for sawdust relief. My guess(tm) is
the saw blades were laser or waterjet cut to the desired shape. Real
26" dia saw blades are NOT cheap ($1,000/ea):
https://www.amazon.com/Popular-Tools-NF2612-Non-Ferrous-Teeth-165/dp/B004RIWA8Q
Much cheaper used (about $175/ea):
https://www.ebay.com/b/Sawmill-Blade/13875/bn_59489360
but still more expensive than having them laser or waterjet cut.

No fenders?



My employee noticed right away that he drilled that fake
"saw blade" with a hand drill in no time at all. Real saw
blades are not at all like that.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On Thu, 18 Feb 2021 13:36:51 -0600, AMuzi wrote:

https://bikerumor.com/2021/02/16/man...d-be-too-easy/

Probably should have fenders for those wheels :-)
--
Cheers,

John B.

On Thu, 18 Feb 2021 13:38:05 -0800, Jeff Liebermann
wrote:

On Thu, 18 Feb 2021 13:36:51 -0600, AMuzi wrote:

https://bikerumor.com/2021/02/16/man...d-be-too-easy/

Very clever and nicely done. Looks like the rear derailleur is
(almost) leaning against the rear blade. I had to ponder why he had
the saw teeth facing different directions on the front and rear
wheels. The teeth provide propulsion when facing one direction, and
braking when facing the other. So, the only brake that actually works
is the front wheel. I'm not sure, but I can't seem to find a rear
disk brake cable.

The saw blades are probably not real saw blades. If you look closely
at the teeth (03:50), they are not beveled and offset as they would be
on a cross-cut blade. Even a lumber milling blade, which has straight
across (no bevel) teeth, has a slight offset. The blade surface does
not appear to be hollow ground for sawdust relief. My guess(tm) is
the saw blades were laser or waterjet cut to the desired shape. Real
26" dia saw blades are NOT cheap ($1,000/ea):
https://www.amazon.com/Popular-Tools-NF2612-Non-Ferrous-Teeth-165/dp/B004RIWA8Q
Much cheaper used (about $175/ea):
https://www.ebay.com/b/Sawmill-Blade/13875/bn_59489360
but still more expensive than having them laser or waterjet cut.

No fenders?

I would guess that the fancy wheels did exactly what they were
designed to do... got the guy a bunch of hits ob his youtube posting
:-)
--
Cheers,

John B.

On Thu, 18 Feb 2021 14:19:41 -0800 (PST), Sir Ridesalot
wrote:

The video shows him building the wheels. He unpackages the saw blades
at 3:22. At first the saw blade teeth cut through the ice 4:32. Then
he added something to each tooth to prevent them from digging into the
ice too far 4:46. At 4:49 you can see that both wheels now have to saw
teeth facing forward at the top of the wheels.

The second test ride was a success.

Cheers

Thanks. I didn't notice that the direction of the blades had changed
near the end of the video. With a "paddle" welded onto each tooth,
the blades could probably be used in either direction for propulsion
or braking.

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

On Thu, 18 Feb 2021 16:24:03 -0600, AMuzi wrote:

My employee noticed right away that he drilled that fake
"saw blade" with a hand drill in no time at all. Real saw
blades are not at all like that.

Good observation.

"Cheap Banggood HSS drill bit versus hard steel circular saw blade"
https://www.youtube.com/watch?v=gTpuhtno4RQ

"Drilling holes in saw blades"
http://www.blackburntools.com/blog/drilling-holes-in-saw-blades/

There are several types of steels used in non-carbide tipped circular
saw blades. I'm running into some contradictory information on the
web, so I'll take my best shot based on my experience and hope it's
right.

Non-carbide circular saw blade bodies are made from mild steel which
can't be hardened. However, the teeth are high carbon (1075 CR1)
through some kind of bi-metal process, which can be hardened and
possibly tempered. Drilling such blades is fairly easy at low rpm.
However, I wouldn't try it with a hand drill.

I'm not sure what carbide tipped circular saw blades are made from.
The outer edge has to be tempered or it won't take brazing the carbide
cutters. How hard and what material is currently unknown.

I once tried making a knife from a mild steel saw blade. No problems
shaping it with an angle grinder or producing an edge with a belt
sander. However, I couldn't harden it and it wouldn't take or keep an
edge. Probably mild steel.




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

On Thursday, February 18, 2021 at 5:24:21 p.m. UTC-5, AMuzi wrote:
On 2/18/2021 3:38 PM, Jeff Liebermann wrote:
On Thu, 18 Feb 2021 13:36:51 -0600, AMuzi wrote:

https://bikerumor.com/2021/02/16/man...d-be-too-easy/

Very clever and nicely done. Looks like the rear derailleur is
(almost) leaning against the rear blade. I had to ponder why he had
the saw teeth facing different directions on the front and rear
wheels. The teeth provide propulsion when facing one direction, and
braking when facing the other. So, the only brake that actually works
is the front wheel. I'm not sure, but I can't seem to find a rear
disk brake cable.

The saw blades are probably not real saw blades. If you look closely
at the teeth (03:50), they are not beveled and offset as they would be
on a cross-cut blade. Even a lumber milling blade, which has straight
across (no bevel) teeth, has a slight offset. The blade surface does
not appear to be hollow ground for sawdust relief. My guess(tm) is
the saw blades were laser or waterjet cut to the desired shape. Real
26" dia saw blades are NOT cheap ($1,000/ea):
https://www.amazon.com/Popular-Tools-NF2612-Non-Ferrous-Teeth-165/dp/B004RIWA8Q
Much cheaper used (about $175/ea):
https://www.ebay.com/b/Sawmill-Blade/13875/bn_59489360
but still more expensive than having them laser or waterjet cut.

No fenders?


My employee noticed right away that he drilled that fake
"saw blade" with a hand drill in no time at all. Real saw
blades are not at all like that.
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

Perhaps he special ordered 'blanks' that weren't hardened or had the teeth set yet?

Cheers