Behold a titan of industry; the AXIAL PISTON PUMP! This beast will output 100 horsepower all day long. Here's the mind blowing part: the pumping element that does all that work FITS IN THE PALM OF YOUR HAND! It has a very interesting feature that is lacking in the hydraulic gear pump: it can vary the flow of oil depending on the demand of the system. It does that by changing the angle of a swash plate. The easy way to visualize how this pumps work is imagining that each piston is a hypodermic syringe whose stroke is limited by the swash plate.
Long term projects here: http://www.Patreon.com/AvE
Long term projects here: http://www.Patreon.com/AvE
Great video. I recollected the maxim from Hydraulics 101(~1991): "Pressure is the resistance to flow." I was "WAVETUBE84", then. I forget exactly, was practically a decade ago. There aren't many gibs that are so poetic… you gotta real kick out of that one. …Another thing or two: (1) If a hydraulic circuit locks up, either a pressure relief valve opens, or something blows. If not, the hydraulic pump can seize the Powerplant. Therefor, the input shaft on yir CSDs and hydraulic pumps are turned undersize (necked down): So the shaft snaps, rather than locking up yir aircraft motor. On yir automobiles, the shaft is pressed into the drive pulley. No splines or woodruff keys. The 1980s Buick Grand National had POWER BRAKES! Not "vacuum assisted" brakes. A line was plumbed off of the POWER STEERING PUMP, which actuated the brake servo. "But why Master?" "Aaaahhh… Grasshopper, because the turbocharger pressurized the intake manifold…no vacuum to 'assist'."
I just got a pump mechanic position. This is gold. Thank you sir!
Called a block kit
I know almost nothing about piston pumps. I viewed this video because the Eastonmade Wood Splitter Corporation is now using these expensive piston pumps in their wood splitters, and I wanted to see what they are about.
Sorry to say, I am as dumb "after viewing" your video, as "before viewing" your video.
However, I do have a few questions:
—Why would anyone give "you" a free $5000 component?
—What are you going to do with it?
—I have never seen such a filthy "workarea" to be taking apart an expensive component, and subjecting it to such filth?
— I have almost seen people with "palsy" more carefully take apart a swiss watch, compared to your recklass, bumbling, and shocking dismantling of such a masterfully built component.
—The donors would have been better off…just throwing that brand new piston pump in the garbage can, instead of giving it to you!
—What kind of company would hire "such a fool" as you?
Tell me I am wrong!
I've been a Patron for a few years now… There sure are a lot less of these quality videos coming from you now. This one is definitely from the good old days.
No one would believe this device would actually work but it does. Worn-out parts is what is actually influence our $ per hour.
Very interesting. Seems like nobody at my job knows anything about hydraulics. Always chasing problems by just changing parts. 1 time we put 14 pumps on in about 3 days time. Finally problem solved. 🤦♂️
Its Magic!
How did you come to learn all of you cast knowledge in engineering and mechanics
According to my mentor that used to make these at Vickers way back in the day (60's era), the cylinders were matched on tolerance to the bores originally and he told them they were idiots for doing that, wasted effort. They said 'well what should we do' and he said they need to thermally-stabilized the centerless grinding machine making the cylinders to remove the size variability, and they said build it. So he used a series of heat-lamps and temp-measuring devices placed over the coolant return to automatically turn the lamps on and off as needed, bringing the coolant to a specific temp regardless of ambient conditions. This thermally-stabilized the whole machine and reduced cylinder variability down to less than one ten-thousandth. Really, really good.
Now there was a big management meeting kerfuffle with company bigwigs in attendance saying he'd destroyed their entire pump business because now they could not match variable tolerances between bores and cylinders anymore, making the housings they were producing useless unless they could somehow match tolerances with the boring machines, which their boring machines were unable to do.
He again told them they were idiots and told them to buy a certain new boring machine that could produce the tolerances needed, which they did. Had it there by the end of the week, brand new, even though there was a two-year waiting list on these things. But hey, it was Vickers back when they were a big name, they threw their weight around.
Problem was, the technician they sent with it could not get it working! It was producing parts but unevenly, not up to the tolerance it was claiming. And he told the guy that the problem was the machine was running on flat-belts and should be running on v-belts, due to the flat-belt joining causing noise that ruined the surface-finish and roundness. So he spent a weekend stripping the belts and pulleys cutting new pulleys on a lathe for v-belts for the machine. He'd had experience building pulleys at his previous company so it was a cinch. This helped, but didn't completely fix the problem as they still had a chatter-issue in the machine as it bored the holes.
He realize the boring tool was too flexible, even though it was a thick piece of hardened steel. So he bought what was at the time probably the largest piece of tungsten-carbide ever made, for use as the boring bar on this machine, and hand-braised a diamond onto the end of it 'somehow'. He's not really sure of the chemistry of how he was actually able to do it, only that it must have carburized on there after so many attempts–this was before people commonly knew that titanium would've been the perfect material for this brazing job. Instead he just spent an entire weekend doggedly brazing this diamond onto the end of this boring-bar for hours on end and failing over and over again until it just worked.
Then he sets up this machine for boring holes and bam, worked like an absolute charm, making perfect-tolerance holes, no chatter, with a gorgeous surface finish, time after time. His bosses were amazed. Now every piston they made matched every hole perfectly and they no longer even needed to do tolerance grading to make sure which pistons fit which holes.
Which made the kind of disassembly you just did in this video, without a witness-mark, possible!
I've always wanted to own one of these style pumps since hearing that story, such an amazing piece of engineering.
As for my mentor, Vickers was priming him to run his own division, but instead he left and started his own company which he ran for the next 60 years, and still at it today in his 90's!
Man this thing is so amazing, so so amazing. I'm in awe.
That looks like 70111 -692 rotating group . what pump do you have
Id say maybe 28 hp i have and old one in manual operation that has old numbers i almost bougt a new paver today but didn't want to kick my cookie jar over still want to fix mine it looks like mine but mines staked with gear pump on rear . Any way mine is sluggish to start i need more info i think piston packs are used same on alot of pumps is the old 70111 381c any info for where source parts or information might be 70142 cessna / eaton / danfoss now i guess these companies get sold and renamed to make it fun to find parts
I work at the place that makes the 9 brass fittings and the housing they are in. Didn't know what they were for. They also machine and polish the Pistons in the pump.
thank you finally something good on youtube
man even when i go back into the ave back catalog. you just always have our backs. still to this day doing us good. your the man dude. giving us a peak under the petty coats. always just giving us the good long and short
Hi, Great video. I learn a lot like that my pump has an internal leak. I have deprecated piston pump of flow of 55 liters/minute and pressure of 148 BAR at 1700 RPM. 1 inch inlet, 3/4 inch inlet (Cessna 70412-307C). I see many gear pumps of better specs starting at $300 while same piston pump in used conditions costs more than $1000. Could I just replace my piston pump by a gear pump adapting shaft and connections? Should I match the inlet diameter in the gear pump? Thanks a lot
thrust bearing oil passages similar to my turbo