150+ Year Old Pratt+Whitney sine bar cut rifling machine ca. 1863 - Coolspring - Part 1 of 2

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Part 1 of 2.
Something interesting shows up at every Coolspring show. At the June 2018 show, the star was this ca. 1863 Pratt & Whitney "Grasshopper" sine bar cut rifling machine.
At the time it was first used, there would have been rows of these machines, driven by lineshafts, powered by either steam or water power. Given the single tiny tool, and the very light cuts taken, each machine would draw only a small fraction of a horsepower.
Here it is driven by an air cooled vertical gas engine, with an antique electric motor for indoor demonstrations when the gas engine can't be run.
It is cutting 12" RH twist, 6 starts, for .308 Win. It cuts on the pull stroke, to avoid bending of the boring bar and possible tool chatter.
Note the elliptical gears, which vary the crank rotational speed to keep the tool speed nearly constant during the cutting stroke.
The sloping ramp (cam) which rotates the tool is called a Sine Bar. At least theoretically, it could be made curved, to provide progressive twist.
The machinist is advancing the cutter manually, by screwing in a wedge below the cutter, but the machine has provision for automatic tool advance, via the extra ratchet mechanism at the end of the machine. The tool feed unit presses on a pushrod sticking out of the boring bar, raising the wedge. It even stops advancing the tool automatically when correct depth has been reached.
The 19th century was an era of tremendous technological progress, when common people came to realize the benefits and liabilities of technology. This machine demonstrates both.
Sine Bar cut rifling machines are still being made, to manufacture match grade cut barrels. Several of these are on RU-vid. One example that is clearly explained is: • Sine Bar Cut Rifling M...
Coolspring Power Museum
June, 2018
664
Panasonic FZ-1000
180615f Coolspring P W Part 1

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31 авг 2018

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Комментарии : 82

@ViceAdmiralMcNugget 3 года назад

The more you look at it the more wonderfully complicated it becomes!

@PatriotPaulUSA 4 года назад

Really amazing to see this great machinery back in action.

@Kicking_Crow Год назад

What a thing of beauty, thank you so much for posting this 👍

@SteamCrane Год назад

I had the good fortune to watch it work in person for 2 days. Even more awesome close up.

@ichabodon 5 лет назад

Just love seeing old machines kept alive

@clayz1 3 года назад

It’s as cool as a Heidelberg letterpress machine. Magnificent.

@jamesspiker6024 3 года назад

Think any thing they make today will be working in a 150 years , I sure don’t ❤️👍

@sheridanblackley9394 3 года назад

Man you and that machine just made my day thank you

@buckaroobonzai3865 2 года назад

Awesome! Thank you for showing!

@Euronasa 2 года назад

Great machine! Love the way it indexes 😀👍

@TheMan1510 6 лет назад

Fascinating machine!

@lizliz7075 11 месяцев назад

This is gold. Buy it's still high tech to what the boy's in Darra use to make AK's. Thanks friend, very good food for the mind of the home machinist. The reindexing at the end of each stroke is genius.

@gregl6002 2 года назад

Single point rifling is the best way. Thats awesome

@SteamCrane 2 года назад

We keep thinking that we're smarter than folks back then...

@rosewhite--- 5 лет назад

So simple but so clever! Now I'd like to see a rifle barrel boring machine that has several barrels held vertically as drills feeding down.

@tuckermoreland147 5 лет назад

i worked in a machine shop that had many belt driven machines. in the old days one steam engine powered the whole factory. by the time i worked there in the 70s they were converted to electric motor drives. they worked perfectly although they were dangerous. mechanical machines once engaged complete the cycle. hydraulics stop and reverse instantly.

@andrewlambert7246 3 года назад

Those old masters knew what they were doing back then.

@1000186ful 2 года назад

I'm 29 years old and this machine is amazing

@mr.lovell3645 5 лет назад

wow, that is a very awesome peace of history....it would look great in my living room :O) I don't suppose anyone has heard of John P. Lovell Arms in Boston, Mass.? they were open around the late 1800s...would be awesome to find some of their things out there some where...

@teresablondin1431 3 года назад

Mr. Lovell. , are you related to John. P. Lovell? What exactly are you looking for?

@holyghost61 5 лет назад

I worked with my Grandfather Bill large from 79 thru 93 making muzzleloaders. I enjoy seeing other methods used to make barrels

@SteamCrane 3 года назад

@bademeister This sine bar design is still the standard for precision rifles.

@impactodelsurenterprise2440 3 года назад

Why is the sine bar method considered superior to all others? Care to explain?

@holyghost61 3 года назад

@@impactodelsurenterprise2440 it is extremely noisy but you can adjust the bar to whatever twist you want from 1in 22 to 1 in 72 or higher.

@scotrussell9577 2 года назад

One of your Grandfather's barrels is in my flintlock longrifle I built in high school; a .45 caliber, 42" and 7/8" across the flats. It's hit in the same spot for 30 years.

@scotrussell9577 Год назад

I was too young to have met your grandfather, but I sure wish I could have. Muzzleloaders and building them have been a passion of mine my entire life. I obtained my barrel through the grapevine of allied enthusiasts who personally knew your grandfather fairly well. One of whom was one of his former son-in-laws and the other one was one of my mentors who was a very active shooter, builder and collector who owned what would become Stumptown Long rifles in Belmont County. I don't like to mention names online, but on the bottom flat of my barrel at the breech it's stamped 'DARBY'; so you probably know who I'm talking about. My Dad got all the parts, including that barrel for me as a gift for the Christmas of 1990.

@prevost8686 3 года назад

I love the sounds that it makes running, Sounds like a huge antique clock running. I wonder what kind of oil he’s using to lubricant the cutting tool and the gears.

@SteamCrane 3 года назад

Ian at Forgotten Weapons just put up a video about the 1819 Hall breech loading flintlock rifle. Hall was apparently the real inventor of manufacture of mass produced precision interchangeable parts using machine tools instead of files. That Hall breech block is a thing of beauty. Eli Whitney faked it.

@jefferyboring4410 Год назад

I’d say cheap motor oil whatever he’s got laying around as long as it’s lathered up.

@Dr._Spamy 5 лет назад

Oval gears to get even/linear movement from the crank stroke I guess. :)

@SteamCrane 3 года назад

Correct.

@ThisOldHelmet 11 месяцев назад

I need that in my garage.

@Peter-od7op 3 года назад

Love it

@myoldmate 11 месяцев назад

I'm completely baffled. I see the contraption going back and forth and that's it. In the 9 minutes I've watched it going back and forth how many barrels has it rifled? I applaud the engineering brilliance behind this but in real terms what is the output of the finished product?

@benniehazelwood3088 5 лет назад

What is the size of the rifle barol can it do and length?

@victorkalashnikov4361 4 года назад

The machine of bad ass, i like that.

@amateurdesubaru 3 года назад

the best part of the video is the pictures at the end ...

@johngearing3885 Месяц назад

I saw a piece on the YT channel "paper cartridges" detailing that studies in the 1850's concluded that progressive depth rifling made for the most accurate rifle muskets. I'm wondering whether the machine in your video can cut such rifling or whether it was produced when that kind of rifling was no longer needed (metallic cartridges?)?

@SteamCrane Месяц назад

I hadn't thought about progressive depth, but progressive twist intrigues me, and could be produced easily by using a curved sine bar instead of this straight one. I don't see a way that this machine could do progressive depth as it is.

@tonybletas930 5 лет назад

I'm thinking if someone with engineering knowledge and manufacturing resources started building these to sell, he'd never keep up with demand. So simple and so effective, our forefathers knew their shit!

@SteamCrane 5 лет назад

Search RU-vid for "Sine Bar Rifling Machine". This design principle is still used today for high end cut barrels. The sine bar is still there, but its location on the machine is different.

@klevee6076 5 лет назад

Today you can buy carbide buttons for 30 bucks,and those buttons are used to squeeze out a rifling shape,in a far more consistent manner than cutting threads as is being done here. Button rifling also allows the leading edge of every land to be profiled,which typically rounds this leading edge off,distorting the bullet far less which allows for more consistent shot placement. Button rifling is the future. These are nice to watch in action and are capable of manufacturing to a very high level of consistency,however they’ll never be as consistent as button rifling. Button rifling allows smaller shops with less money the ability to put out an exceptionally high quality product at a lower cost. Yep. Our forefathers certainly were on the very cutting edge of manufacturing excellence.

@dangoldbach6570 2 года назад

@@klevee6076 Bartlein still uses cut rifling! Have one on my 6mm Ackley improved and it is VERY accurate. I've heard button rifling compresses the grain structure of the barrel steel and it can sometimes spring back if the barrel steel has an inconsistency but, for doing a 90+%job in one tenth the time it is definitely a good way to get a good rifling job fast. With good steel, button rifled barrels are great shooters for a lot less $$$

@chapiit08 5 лет назад

Cool machine. But I can't figure out the purpose of the small toothed cog and indexing hand at the end of the bed.

@SteamCrane 5 лет назад

It isn't in use here, but it automatically advances the tool after each full revolution. It also stops advancing the tool when the desired rifling depth has been reached.

@mtericktucson 4 года назад

I'm parking the Prius outside if I can score one of these.

@jefferyboring4410 Год назад

I’m curious about the flexibility so he said he does .308 bore up to 24” that’s awsome . I just wander the twist rate probably a 20-24” but I could be wrong I’m curious if he can change the twist that toothed rod and gear moving up and down would probably need swapped .

@SteamCrane Год назад

Just change the sine bar, although a much faster twist might require changing the gear.

@ederangelo21 2 года назад

Have vídeos with machines moderna ? Some send link of RU-vid.

@stevehuffman7453 3 года назад

Rate of twist adjustable? What was/is rate of twist for this barrel? What caliber? Is this barrel for a modern cartridge rifle or muzzlelader? Details, please.

@weeveferrelaine6973 Год назад

Yes, the rate of twist is set by that slanted bar at the bottom, and is adjustable. By appearances, it looks like it can take whatever caliber cutter bit you put in it, as long as the OD of the barrel isn't too much to chuck in at the end. If you use something like a carbide insert, the machine would be able to cut just about any steel you wanted, and should be fine with modern cartridges.

@trebushett2079 Год назад

If the machine is a corsshopper, the camera operator is a grasshopper!

@ValMartinIreland Год назад

Why are the two cog wheels driving the crank so strange?

@SteamCrane Год назад

They make the toolbar move at constant speed as the lever rotates. Another case of the genius of our ancestors.

@ryan370 3 года назад

Whats the deal with the 2 oval gears on the right side of the screen? What does that do mechanically? I would guess it makes the speed/torque change with the position of the shaft, but I honestly have no clue

@SteamCrane 3 года назад

They compensate for the varying effective length of the lever arm, to give near constant feed rate.

@furkantasbasev3860 3 года назад

Yeah!!!

@notamouse5630 3 года назад

And if the sine bar isn't straight, you can get gain twist rifling.

@SteamCrane Год назад

Yup!

@oldschool1993 5 лет назад

Dude-pan back and hold the camera steady.

@gottmituns3225 5 лет назад

I was thinking at the same damn thing😆❗❗❗🤙🏼🤝🏻👏🏻✊🏻

@johnnyholland8765 4 месяца назад

The best most accurate barrels are cut rifled...

@johnnyholland8765 4 года назад

One groove at a time one barrel at a time. So many barrels so little time.........

@SteamCrane 4 года назад

...so they had a lot of machines set up, with guys to keep them fed + lubed. Finished barrels would have stacked up fairly fast.

@john90430 3 года назад

"YT is throwing ads where they shouldn't be! Worse, many of the ads are offensive." That was September of 2018. The offensiveness of the ads has increased astronomically since then!

@youenn2180 Год назад

1863 ? To make such a machine you needed machines , when the hell did all that start ?

@SteamCrane Год назад

Sometime in the BC's, with wood lathes and water powered saws. Continuous progression since then, but by the 1860's they had accurate lathes, milling machines, and precise calipers and micrometers. What they didn't have is CNC, but cam controlled automatic screw machines were developed in the 1870's. What they had that we lost is ornate frame design, early machine tools and steam engines were beautiful. Jacquard patented the punch card controlled loom in 1804, but it was based on earlier patents from 1725 onward.