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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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OT Impact wrench design
Ed Huntress writes: On Fri, 2 Oct 2015 18:09:06 +0000 (UTC), John Doe wrote: Leverage pushes the wheel into the ground that provides traction. Just like leverage can push a drum into a wheel. But, I'm pretty sure that friction drive using a drum on a tire, even when using auto-grip, is significantly less efficient than driving a bicycle by its chain. That's how the Solex works, driving the front wheel. I rode one of those all around Lausanne, Switzerland, in 1968. There must have been millions of htem in use. It's also how my 50-year-old Ohlson & Rice "Chickenpower" (1 hp) gas bike motor works. If you want, I'll post a photo of it. Not a motorbike but metalwork-related; here's my shot at a friction drive for a 300# air hammer: http://home.tallships.ca/mspencer/shop/AO-power.html Worked fine -- for certain constrained values of "fine". :-) -- Mike Spencer Nova Scotia, Canada |
#2
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OT Impact wrench design
On 04 Oct 2015 20:58:10 -0300, Mike Spencer
wrote: Ed Huntress writes: On Fri, 2 Oct 2015 18:09:06 +0000 (UTC), John Doe wrote: Leverage pushes the wheel into the ground that provides traction. Just like leverage can push a drum into a wheel. But, I'm pretty sure that friction drive using a drum on a tire, even when using auto-grip, is significantly less efficient than driving a bicycle by its chain. That's how the Solex works, driving the front wheel. I rode one of those all around Lausanne, Switzerland, in 1968. There must have been millions of htem in use. It's also how my 50-year-old Ohlson & Rice "Chickenpower" (1 hp) gas bike motor works. If you want, I'll post a photo of it. Not a motorbike but metalwork-related; here's my shot at a friction drive for a 300# air hammer: http://home.tallships.ca/mspencer/shop/AO-power.html Worked fine -- for certain constrained values of "fine". :-) Ha! Shift gears to accomodate scale. g OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. -- Ed Huntress |
#3
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OT Impact wrench design
Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. They had a contract from the government to make them for government wharves -- wharves built in many small fishing villages, owned and maintained by the feds for the local fishing fleets. Those 10HP Acadias came equipped with a sprocket and a chain-driven winch to haul boats out on a skidway. That ended in the 70s and many of the engines were vandalized or stolen. Mine is the same size but isn't one of those. It's equipped with a flat-belt pulley. Shortly before the plant was closed, the manager gave me a photocopy of the "manual" for my engine. I've put it on line: http://home.tallships.ca/mspencer/acadia/index.html -- Mike Spencer Nova Scotia, Canada |
#4
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OT Impact wrench design
On 05 Oct 2015 02:36:11 -0300, Mike Spencer
wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. They had a contract from the government to make them for government wharves -- wharves built in many small fishing villages, owned and maintained by the feds for the local fishing fleets. Those 10HP Acadias came equipped with a sprocket and a chain-driven winch to haul boats out on a skidway. That ended in the 70s and many of the engines were vandalized or stolen. Mine is the same size but isn't one of those. It's equipped with a flat-belt pulley. Shortly before the plant was closed, the manager gave me a photocopy of the "manual" for my engine. I've put it on line: http://home.tallships.ca/mspencer/acadia/index.html I'll bet that's good for some conversation. Back in the '70s, when there was a newsletter called "Classic Boat Monthly" (which evolved into _Wooden Boat_ magazine), I read an account of Acadias being used in lobster boats and inshore fishing boats in the Canadian Maritimes. I thought that they must have a lot of patience. g Apparently you could reverse the engine by turning off the ignition, waiting until the engine almost stopped, and then flipping it on again at just the right moment. Otherwise, you had to wait for it to stop and then kick the flywheel in reverse with your foot. Do you run the stationary version like that? -- Ed Huntress |
#5
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OT Impact wrench design
On 05 Oct 2015 02:36:11 -0300, Mike Spencer
wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. They had a contract from the government to make them for government wharves -- wharves built in many small fishing villages, owned and maintained by the feds for the local fishing fleets. Those 10HP Acadias came equipped with a sprocket and a chain-driven winch to haul boats out on a skidway. That ended in the 70s and many of the engines were vandalized or stolen. Mine is the same size but isn't one of those. It's equipped with a flat-belt pulley. Shortly before the plant was closed, the manager gave me a photocopy of the "manual" for my engine. I've put it on line: http://home.tallships.ca/mspencer/acadia/index.html Those old beasties are pretty cool to watch running. They had lots of folks bring their running engines to the old Vista, CA Gas and Steam Engine Museum during the Fair days. Ditto the Pottsville shindigs in Merlin, OR up here. Everyone called them "hit & miss" engines. I got to help a few guys get theirs running (mostly grunt work, but fun), but never tore one down. The centrifugal governor grounded the spark and kept the exhaust valve open during overrev. Simple yet effective. https://www.youtube.com/watch?v=fXkNqjUPL_M Running engine -- Canadian: An unarmed American with healthcare. |
#6
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OT Impact wrench design
"Larry Jaques" wrote in message
... On 05 Oct 2015 02:36:11 -0300, Mike Spencer wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. They had a contract from the government to make them for government wharves -- wharves built in many small fishing villages, owned and maintained by the feds for the local fishing fleets. Those 10HP Acadias came equipped with a sprocket and a chain-driven winch to haul boats out on a skidway. That ended in the 70s and many of the engines were vandalized or stolen. Mine is the same size but isn't one of those. It's equipped with a flat-belt pulley. Shortly before the plant was closed, the manager gave me a photocopy of the "manual" for my engine. I've put it on line: http://home.tallships.ca/mspencer/acadia/index.html Those old beasties are pretty cool to watch running. They had lots of folks bring their running engines to the old Vista, CA Gas and Steam Engine Museum during the Fair days. Ditto the Pottsville shindigs in Merlin, OR up here. Everyone called them "hit & miss" engines. I got to help a few guys get theirs running (mostly grunt work, but fun), but never tore one down. The centrifugal governor grounded the spark and kept the exhaust valve open during overrev. Simple yet effective. https://www.youtube.com/watch?v=fXkNqjUPL_M Running engine I timed a large one idling at a show. It would fire two or three times, then coast for 45 seconds. 600 HP: https://www.youtube.com/watch?v=Jcjt0uQDbxw |
#7
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OT Impact wrench design
On Mon, 5 Oct 2015 09:48:29 -0400, "Jim Wilkins"
wrote: "Larry Jaques" wrote in message .. . On 05 Oct 2015 02:36:11 -0300, Mike Spencer wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. They had a contract from the government to make them for government wharves -- wharves built in many small fishing villages, owned and maintained by the feds for the local fishing fleets. Those 10HP Acadias came equipped with a sprocket and a chain-driven winch to haul boats out on a skidway. That ended in the 70s and many of the engines were vandalized or stolen. Mine is the same size but isn't one of those. It's equipped with a flat-belt pulley. Shortly before the plant was closed, the manager gave me a photocopy of the "manual" for my engine. I've put it on line: http://home.tallships.ca/mspencer/acadia/index.html Those old beasties are pretty cool to watch running. They had lots of folks bring their running engines to the old Vista, CA Gas and Steam Engine Museum during the Fair days. Ditto the Pottsville shindigs in Merlin, OR up here. Everyone called them "hit & miss" engines. I got to help a few guys get theirs running (mostly grunt work, but fun), but never tore one down. The centrifugal governor grounded the spark and kept the exhaust valve open during overrev. Simple yet effective. https://www.youtube.com/watch?v=fXkNqjUPL_M Running engine I timed a large one idling at a show. It would fire two or three times, then coast for 45 seconds. 600 HP: https://www.youtube.com/watch?v=Jcjt0uQDbxw Bear in mind that a "hit-and-miss" engine is not the same thing as these Canadian "make-and-break" engines. The Acadia fires on every cycle; it doesn't idle for multiple revolutions, like a hit-and-miss. And hit-and-miss engines were 4-strokes; the Acadia type make-and-break is a 2-stroke. Hit-and-miss engines could have either spark plugs or the low-voltage "igniter" ignition, which was a pair of points that opened and created a spark (actually, an arc, but we won't quibble). The make-and-break always has that type of ignition, and is named for it. As Mike says on his webpage, there were other brands, which were once very popular for working boats in Mike's neck of the woods. Here's one, an Atlantic, in operation on a boat: https://www.youtube.com/watch?v=UxGw...eature=related As you can see, it moves that boat along pretty darned well for 4 hp. The low rpm was well matched to the low speed of those displacement hulls, which results in efficient propellers. -- Ed Huntress |
#8
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OT Impact wrench design
"Jim Wilkins" writes: "Larry Jaques" wrote in message ... On 05 Oct 2015 02:36:11 -0300, Mike Spencer wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. [snip] http://home.tallships.ca/mspencer/acadia/index.html Those old beasties are pretty cool to watch running. They had lots of folks bring their running engines to the old Vista, CA Gas and Steam Engine Museum during the Fair days. Ditto the Pottsville shindigs in Merlin, OR up here. Everyone called them "hit & miss" engines. [snip] I timed a large one idling at a show. It would fire two or three times, then coast for 45 seconds. When I was a kid, I would often hear one running at some neighboring farm -- a crew of guys cutting 4' cordwood into stove-length bolts. The engine would idle, firing every 4 to 6 or so cycles. sssp...sssp...sssp...foont.FOONT...sssp...sssp...s ssp...sssp When wood was shoved into the saw, the engine would lug down a bit, it woulld fire on every stroke. Then, as the saw cut through, the speed would pick up and it would go back to idle but the sawblade would ring. sssp...foont.FOONT.FOONT.FOONT.FOONT.FOONT..foont. .BRRANNNGGGoinnnng...sssp One of those mystical magical sounds from childhood. I can hear it every time I look at the Acadia. (I also am reminded of the guy I met years later who had fallen into such a saw. At the beach you could see that he had a single ragged scar from near his ear down to one ankle. Amazingly, all of his body parts were still attached and still worked.) -- Mike Spencer Nova Scotia, Canada |
#9
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OT Impact wrench design
On 05 Oct 2015 15:39:10 -0300, Mike Spencer
wrote: "Jim Wilkins" writes: "Larry Jaques" wrote in message ... On 05 Oct 2015 02:36:11 -0300, Mike Spencer wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. [snip] http://home.tallships.ca/mspencer/acadia/index.html Those old beasties are pretty cool to watch running. They had lots of folks bring their running engines to the old Vista, CA Gas and Steam Engine Museum during the Fair days. Ditto the Pottsville shindigs in Merlin, OR up here. Everyone called them "hit & miss" engines. [snip] I timed a large one idling at a show. It would fire two or three times, then coast for 45 seconds. When I was a kid, I would often hear one running at some neighboring farm -- a crew of guys cutting 4' cordwood into stove-length bolts. The engine would idle, firing every 4 to 6 or so cycles. sssp...sssp...sssp...foont.FOONT...sssp...sssp...s ssp...sssp When wood was shoved into the saw, the engine would lug down a bit, it woulld fire on every stroke. Then, as the saw cut through, the speed would pick up and it would go back to idle but the sawblade would ring. sssp...foont.FOONT.FOONT.FOONT.FOONT.FOONT..foont ..BRRANNNGGGoinnnng...sssp One of those mystical magical sounds from childhood. I can hear it every time I look at the Acadia. (I also am reminded of the guy I met years later who had fallen into such a saw. At the beach you could see that he had a single ragged scar from near his ear down to one ankle. Amazingly, all of his body parts were still attached and still worked.) The Gods were smiling on him. |
#10
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OT Impact wrench design
Ed Huntress writes: Bear in mind that a "hit-and-miss" engine is not the same thing as these Canadian "make-and-break" engines. The Acadia fires on every cycle; it doesn't idle for multiple revolutions, like a hit-and-miss. And hit-and-miss engines were 4-strokes; the Acadia type make-and-break is a 2-stroke. You've more or less answered your own question about whether my 10 HP stationary runs in reverse. The small marine engines were 2-stroke but the stationary ones were four-stroke. My 10HP is 4-stroke and doesn't run in reverse. Hit-and-miss engines could have either spark plugs or the low-voltage "igniter" ignition, which was a pair of points that opened and created a spark (actually, an arc, but we won't quibble). The make-and-break always has that type of ignition, and is named for it. Some had a magneto. Some with a magneto used a separate spark plug while others fired the magneto spark into a "points"-like device very like the "igniter" to which you refer. Others had a battery and "spark coil" which discharged as a spark/arc when the igniter points opened instead of a mageneto. My 10 HP Acadia had a magneto of the second type which worked when I got it in the early 70s but had disintegrated (despite being boxed up in a dry place) when I went to fix it up circa 2004. So I replaced the magneto unit with an igniter from another engine and home-rolled coil, modified the timing train with a hand-forged part and it now runs fine again. As Mike says on his webpage, there were other brands, which were once very popular for working boats in Mike's neck of the woods. Here's one, an Atlantic, in operation on a boat: I think that's the Lunenburg Foundry brand. Still in business but the iron foundry is long since closed. I used to get my forge firepots there. https://www.youtube.com/watch?v=UxGw...eature=related As you can see, it moves that boat along pretty darned well for 4 hp. The low rpm was well matched to the low speed of those displacement hulls, which results in efficient propellers. Circa 1970, I watched an old guy in a small open fishing boat come into a local little harbour with such a single-banger engine running. He was standing in the boat; stopped the engine, kick-started it in reverse. Never looked up from the floor of the boat again as he tidied some gear, collected his lunch bucket and jacket, picked up a line while stopping the engine as he walked past, stepped up on the bow thwart and onto the wharf without breaking his stride just as the moving boat touched it. Whipped the line around a post and went home. I guess he must have done that exact thing in exactly the same boat and same place maybe 18,000 times in the past 60 years and didn't *have* to look to see where he was going. -- Mike Spencer Nova Scotia, Canada |
#11
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OT Impact wrench design
On 05 Oct 2015 21:31:24 -0300, Mike Spencer
wrote: Ed Huntress writes: Bear in mind that a "hit-and-miss" engine is not the same thing as these Canadian "make-and-break" engines. The Acadia fires on every cycle; it doesn't idle for multiple revolutions, like a hit-and-miss. And hit-and-miss engines were 4-strokes; the Acadia type make-and-break is a 2-stroke. You've more or less answered your own question about whether my 10 HP stationary runs in reverse. The small marine engines were 2-stroke but the stationary ones were four-stroke. My 10HP is 4-stroke and doesn't run in reverse. Hit-and-miss engines could have either spark plugs or the low-voltage "igniter" ignition, which was a pair of points that opened and created a spark (actually, an arc, but we won't quibble). The make-and-break always has that type of ignition, and is named for it. Some had a magneto. Some with a magneto used a separate spark plug while others fired the magneto spark into a "points"-like device very like the "igniter" to which you refer. Others had a battery and "spark coil" which discharged as a spark/arc when the igniter points opened instead of a mageneto. My 10 HP Acadia had a magneto of the second type which worked when I got it in the early 70s but had disintegrated (despite being boxed up in a dry place) when I went to fix it up circa 2004. So I replaced the magneto unit with an igniter from another engine and home-rolled coil, modified the timing train with a hand-forged part and it now runs fine again. Jeez, there must be so many variations on those old engines that some have gotten lost in history. My old partner in the machine shop had an "oil engine" that must hve been from the turn of the last century. Horizontal, with a big flywheel, it was some kind of little utility engine. It ran on kerosene, but it was spark-ignition. You had to start it with naptha or gasoline. Speaking of which I saw a naptha launch at a boat show many years ago. Until I saw that one, I never would have known that a "naptha engine" was actually a type of steam engine, with naptha for the working fluid rather than the fuel. As Mike says on his webpage, there were other brands, which were once very popular for working boats in Mike's neck of the woods. Here's one, an Atlantic, in operation on a boat: I think that's the Lunenburg Foundry brand. Still in business but the iron foundry is long since closed. I used to get my forge firepots there. https://www.youtube.com/watch?v=UxGw...eature=related As you can see, it moves that boat along pretty darned well for 4 hp. The low rpm was well matched to the low speed of those displacement hulls, which results in efficient propellers. Circa 1970, I watched an old guy in a small open fishing boat come into a local little harbour with such a single-banger engine running. He was standing in the boat; stopped the engine, kick-started it in reverse. Never looked up from the floor of the boat again as he tidied some gear, collected his lunch bucket and jacket, picked up a line while stopping the engine as he walked past, stepped up on the bow thwart and onto the wharf without breaking his stride just as the moving boat touched it. Whipped the line around a post and went home. I guess he must have done that exact thing in exactly the same boat and same place maybe 18,000 times in the past 60 years and didn't *have* to look to see where he was going. Practice, practice... -- Ed Huntress |
#12
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OT Impact wrench design
On Mon, 5 Oct 2015 09:48:29 -0400, "Jim Wilkins"
wrote: "Larry Jaques" wrote in message .. . On 05 Oct 2015 02:36:11 -0300, Mike Spencer wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. They had a contract from the government to make them for government wharves -- wharves built in many small fishing villages, owned and maintained by the feds for the local fishing fleets. Those 10HP Acadias came equipped with a sprocket and a chain-driven winch to haul boats out on a skidway. That ended in the 70s and many of the engines were vandalized or stolen. Mine is the same size but isn't one of those. It's equipped with a flat-belt pulley. Shortly before the plant was closed, the manager gave me a photocopy of the "manual" for my engine. I've put it on line: http://home.tallships.ca/mspencer/acadia/index.html Those old beasties are pretty cool to watch running. They had lots of folks bring their running engines to the old Vista, CA Gas and Steam Engine Museum during the Fair days. Ditto the Pottsville shindigs in Merlin, OR up here. Everyone called them "hit & miss" engines. I got to help a few guys get theirs running (mostly grunt work, but fun), but never tore one down. The centrifugal governor grounded the spark and kept the exhaust valve open during overrev. Simple yet effective. https://www.youtube.com/watch?v=fXkNqjUPL_M Running engine I timed a large one idling at a show. It would fire two or three times, then coast for 45 seconds. Yeah, with no drag on it. The big one in Vista had a 6" diameter exhaust pipe which would blow smoke rings when it was running. I think it was a Chicago Pneumatic 70hp with about a 7' diameter 12" thick flywheel. It was either that or an Ideal type K. They evidently had an influx of new Morse engines since I left. http://agsemgasenginerow.yolasite.co...-pneumatic.php When they had tractor shows, they'd run the old steam traction engines with belts to do hay baling, log milling, and all sorts of things. The locomotive-looking types would sure put off the heat! The blacksmiths would fire up the coal and make tools and trinkets for sale, etc. It was an all-day fun affair. 600 HP: https://www.youtube.com/watch?v=Jcjt0uQDbxw She's a big 'un. What's that screech, just before the slight whistle while it runs? Sounds like an oil cup (or three) is empty somewhere. -- Canadian: An unarmed American with healthcare. |
#13
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OT Impact wrench design
On 05 Oct 2015 15:39:10 -0300, Mike Spencer
wrote: "Jim Wilkins" writes: "Larry Jaques" wrote in message ... On 05 Oct 2015 02:36:11 -0300, Mike Spencer wrote: Ed Huntress writes: OOohh...you have an Acadia? You mean one of the old make-and-break engines? That must be fun. Yeah, it is! It's a 10 HP. They were made in Bridgewater, about 13 miles from me and I was in the plant in the early 70s when they were still making them. [snip] http://home.tallships.ca/mspencer/acadia/index.html Those old beasties are pretty cool to watch running. They had lots of folks bring their running engines to the old Vista, CA Gas and Steam Engine Museum during the Fair days. Ditto the Pottsville shindigs in Merlin, OR up here. Everyone called them "hit & miss" engines. [snip] I timed a large one idling at a show. It would fire two or three times, then coast for 45 seconds. When I was a kid, I would often hear one running at some neighboring farm -- a crew of guys cutting 4' cordwood into stove-length bolts. The engine would idle, firing every 4 to 6 or so cycles. sssp...sssp...sssp...foont.FOONT...sssp...sssp...s ssp...sssp When wood was shoved into the saw, the engine would lug down a bit, it woulld fire on every stroke. Then, as the saw cut through, the speed would pick up and it would go back to idle but the sawblade would ring. sssp...foont.FOONT.FOONT.FOONT.FOONT.FOONT..foont ..BRRANNNGGGoinnnng...sssp One of those mystical magical sounds from childhood. I can hear it every time I look at the Acadia. (I also am reminded of the guy I met years later who had fallen into such a saw. At the beach you could see that he had a single ragged scar from near his ear down to one ankle. Amazingly, all of his body parts were still attached and still worked.) Yes, memories of the sounds and smells of our childhood wonder years are truly wonderful. Those smoke rings sure gave me a kick. -- Canadian: An unarmed American with healthcare. |
#14
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OT Impact wrench design
On 05 Oct 2015 21:31:24 -0300, Mike Spencer
wrote: Ed Huntress writes: Bear in mind that a "hit-and-miss" engine is not the same thing as these Canadian "make-and-break" engines. The Acadia fires on every cycle; it doesn't idle for multiple revolutions, like a hit-and-miss. And hit-and-miss engines were 4-strokes; the Acadia type make-and-break is a 2-stroke. You've more or less answered your own question about whether my 10 HP stationary runs in reverse. The small marine engines were 2-stroke but the stationary ones were four-stroke. My 10HP is 4-stroke and doesn't run in reverse. Hit-and-miss engines could have either spark plugs or the low-voltage "igniter" ignition, which was a pair of points that opened and created a spark (actually, an arc, but we won't quibble). The make-and-break always has that type of ignition, and is named for it. Some had a magneto. Some with a magneto used a separate spark plug while others fired the magneto spark into a "points"-like device very like the "igniter" to which you refer. Others had a battery and "spark coil" which discharged as a spark/arc when the igniter points opened instead of a mageneto. I've seen one magneto engine to every 50+ mechanical type. They were very rare in LoCal and here in Oregon, from what I've seen. Maybe more of the magnetos were damaged with age, or stolen for copper wire? Then again, I'm on the Left Coast, far away from Acadia's home. My 10 HP Acadia had a magneto of the second type which worked when I got it in the early 70s but had disintegrated (despite being boxed up in a dry place) when I went to fix it up circa 2004. So I replaced the magneto unit with an igniter from another engine and home-rolled coil, modified the timing train with a hand-forged part and it now runs fine again. Oh, you answered my question/thoughts. g As Mike says on his webpage, there were other brands, which were once very popular for working boats in Mike's neck of the woods. Here's one, an Atlantic, in operation on a boat: I think that's the Lunenburg Foundry brand. Still in business but the iron foundry is long since closed. I used to get my forge firepots there. https://www.youtube.com/watch?v=UxGw...eature=related As you can see, it moves that boat along pretty darned well for 4 hp. The low rpm was well matched to the low speed of those displacement hulls, which results in efficient propellers. 4hp, 670 ft/lb of torque. very big grin I wonder what horsepower that little steam engine in the African Queen put out... Circa 1970, I watched an old guy in a small open fishing boat come into a local little harbour with such a single-banger engine running. He was standing in the boat; stopped the engine, kick-started it in reverse. Never looked up from the floor of the boat again as he tidied some gear, collected his lunch bucket and jacket, picked up a line while stopping the engine as he walked past, stepped up on the bow thwart and onto the wharf without breaking his stride just as the moving boat touched it. Whipped the line around a post and went home. I guess he must have done that exact thing in exactly the same boat and same place maybe 18,000 times in the past 60 years and didn't *have* to look to see where he was going. Talk about exotic habits. Har! -- Canadian: An unarmed American with healthcare. |
#15
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OT Impact wrench design
On 05 Oct 2015 21:31:24 -0300, Mike Spencer
wrote: As Mike says on his webpage, there were other brands, which were once very popular for working boats in Mike's neck of the woods. Here's one, an Atlantic, in operation on a boat: I think that's the Lunenburg Foundry brand. Still in business but the iron foundry is long since closed. I used to get my forge firepots there. https://www.youtube.com/watch?v=UxGw...eature=related NICE engine! |
#16
Posted to rec.crafts.metalworking
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OT Impact wrench design
Gunner Asch writes: On 05 Oct 2015 21:31:24 -0300, Mike Spencer wrote: As Mike says on his webpage, there were other brands, which were once very popular for working boats in Mike's neck of the woods. Here's one, an Atlantic, in operation on a boat: I think that's the Lunenburg Foundry brand. Still in business but the iron foundry is long since closed. I used to get my forge firepots there. https://www.youtube.com/watch?v=UxGw...eature=related NICE engine! There are numerous Atlantic single-banger marine engines lying around in junk piles and back yards here. The problem with all of them is that the cast iron water jacket, integral with the head and cylinder, on all of them is burst, I suppose from feezing when full of water. Other parts typically in good order. I have one myself. I've sometimes wondered if I could backtrack that spam I get from Chinese foundries and get a bunch of them cast. Wouldn't sell like hotcakes but I bet I could unload a couple of dozen at a profit. But I suspect that quality control would be a problem I won't live long enough to sort out. :-) -- Mike Spencer Nova Scotia, Canada |
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