Today I Learned

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Bystander said:
Steel.
Nah. The teeth are spaced too far apart. That's a radial arm saw for cutting flooring or crown molding accurately.
 
on Phys.org
Borg said:
Nah. The teeth are spaced too far apart. That's a radial arm saw for cutting flooring or crown molding accurately.
It's a chop saw, not a radial arm saw. In a chop saw the blade/motor pivots up and down. In a radial arm saw the blade/motor runs forward and back in a track

The blades are interchangable. The blade shown would not be good for steel, but they make abrasive disks that work on steel. The blade shown actually looks very much like one I once used to cut aluminum tubing.
 
Yes it's a chop saw. Was sans blade but the residue on it was metal not wood. With a new abrasive cutoff blade for metal It throws a stream of sparks about 12 feet behind but the deflector directs them slightly downward. Looks like Buck Rogers' rocket engine.
It labors a bit on 1/4 inch steel plate but with the toothed blade shown in that picture (from their catalog) it would cut wood like a woodchuck.

I think it's part of my autism i can't stand to see good machinery wasted . A lot of aluminum boats go through the scrap yard, and I've rescued several antique outboards.
I'm learning how to wire washing machine motors for workshop applications, how else can you get a 1/2 hp electric motor for under 5 bucks ? Whirlpools are easy now.

Does PF need a "handyman's corner " ? I'm sensitive about PF's image, don't want to lower the academic standards with my play.
 
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I find the rescue things are repeated quite a lot too, which makes me think like things being rescued are dumb or disrespectful or without any sincere gratitude.
What a practical "rescue" it does sound!
 
zoobyshoe said:
The blade shown would not be good for steel...
That's probably true, however, a company named Scotchman Industries makes a http://www.scotchman.com/cold-saws/ that does have metal cutting teeth...

My wife is from Philip, South Dakota, so while there visiting in-laws ... I went through the plant.....:oldcool:

The company is primarily known for a product called the Scotchman Ironworker, which we used way back in welding school... that be, waaaay back.... lol

Here's the 350 cold saw in operation...

Their YouTube channel...

They very definitely make good products... although, a tad on the $$$ side.
 
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OCR said:
That's probably true, however, a company named Scotchman Industries makes a http://www.scotchman.com/cold-saws/ that does have metal cutting teeth...

My wife is from Philip, South Dakota, so while there visiting in-laws ... I went through the plant.....:oldcool:

The company is primarily known for a product called the Scotchman Ironworker, which we used way back in welding school... that be, waaaay back.... lol

Here's the 350 cold saw in operation...

Their YouTube channel...

They very definitely make good products... although, a tad on the $$$ side.
If you notice that saw can cut steel because it can do very low RPMs. Any blade with carbide teeth can cut steel in principle, but the average chop saw is set at a fixed RPM that is just too high: the teeth would burn up very quickly.

Any material harder than steel can be fashioned into a blade that will cut soft(unhardened) steel. In fact, hardened steel will cut soft steel, which is the situation with your average hack saw. The other variable besides relative hardness is heat removal. When a blade heats up too much it loses its hardness and will become dull. You have to either saw slowly to let the heat dissipate, or use a coolant.
 
zoobyshoe said:
If you notice that saw can cut steel because it can do very low RPMs.
Well yes, I did notice, in fact I noticed when I went through the plant and saw one they used as a demo...

Also, I noticed...
For ferrous material, this unique type of cutting turns the blade at a very low RPM, similar to a milling process, giving a FAST, precise, burr-free cut without heat or sparks.
http://www.scotchman.com/cold-saws/

I'm not quite following ... are you agreeing, or arguing ?

Anyway... carry on.
 
OCR said:
I'm not quite following ... are you agreeing, or arguing ?
I'm explicating why the saw you linked to can cut steel with a toothed blade while a "normal" chop saw couldn't.
 
zoobyshoe said:
I'm explicating why...
I see, so... you saw a saw, saw, that could out saw any saw you ever saw, saw... so, if ever you see a saw out

saw that saw you saw, saw... I'd like to see that saw, you saw, saw, saw too, see ?......:oldbiggrin:
 
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TIL: How to animate my stepwise (and incomplete) model of the solar system!
 
http://news.yahoo.com/far-below-south-dakota-cave-holds-pure-promising-184902493.html
WIND CAVE NATIONAL PARK, S.D. (AP) — Hundreds of feet beneath the Black Hills, a team of scientists and researchers snake through dark, narrow and silent corridors of ancient rock to reach their goal: what is thought to be some of the purest water on Earth.
 
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Today I learned that Wy'east is the native name of our local, tallest mountain, Mt. Hood.
I always thought it was just a clever name for a Western beer YEAST producer.
Coincidentally, Wy'east yeast labs overlooks Wy'east, the mountain, from the town of Hood River, which was named after the river, Hood River, which was named after Mt. Hood.
How Mt. Hood got its name according to wiki: "Lt. Broughton named the mountain after Lord (Samuel) Hood, a British Admiral at the Battle of the Chesapeake."
Ha! Hood Canal, in Washington state, was also named after the Admiral. I was housed at the submarine base in Bangor, on the Hood canal, for 3 years, while in the Navy.
Admiral Hood served in the Royal Navy for 53 years, and lived to be 91.

ps. I looked this all up today, when I heard that yesterday, the name of Mt. McKinley had been officially changed to Denali.
Looks like that took a while.
wiki said:
...
The Alaska Board of Geographic Names changed the name of the mountain to Denali in 1975 which is how it is called locally.
...
Congressman Bob Gibbs, who described Obama's action as "constitutional overreach" because he said an act of Congress is required to rename the mountain. The Alaska Dispatch News reported that the Secretary of the Interior has authority under federal law to change geographic names when the Board of Geographic Names does not act on a naming request within a "reasonable" period of time. Jewell told the ADN that "I think any of us would think that 40 years is an unreasonable amount of time."
 
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It is really effective against insects, however.Edit: Today I learned how automatic subtitles work. I saw this video and didn't understand the speaker. The video has subtitles, but apparently google didn't understand the speaker either because the subtitles do not make sense at all (some of them are funny).
 
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Astronuc said:
TIL, "The DEET within insect repellant is an oily liquid known as diethyltoluamide that mosquitos and other inspects intensely dislike. DEET has been known to destroy the varnish on wooden tables, melt plastics, and even permanently mark TV screens."
https://www.yahoo.com/autos/how-something-you-spray-on-your-kids-can-melt-your-128334848277.html

Don't spray around furniture or cars, or probably anything else of value.
I recall how a can of repellant with DEET as its active constituent carried a note to the user along the lines of, "Caution: this product may be harmful if used for prolonged periods". Yet it gave no indication of what length of exposure might fall into the category of "a prolonged period".

Hours, days, weeks, or maybe months? Clearly, their legal department wasn't about to commit themselves on this score!
 
I learned that many imports come from other countries.
[was watching old stand ups by Robin Williams, one of my favourite jokes of his he makes about George W Bush ]
 

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