DIY. Electric pcp pump.
- Thread starter Gunnertrones
- Start date
Two concern maybe? Overheating, or God forbid - you get a call from your mother in law, leave the room for a minute - and yes, (right) - one minute becomes booom minutes... Unless there is a fuse or sort of stop function attached to the device. 
Upvote 0
That's very cool, Joerg made one out of wood a while ago that does the same thing. Not as refined and strong looking as this one, very cool. With these high pressure pumps it's imperative to keep an eye on it even if it has an auto stop I would. If you're too busy to watch it then wait for another time, too much potential energy to walk away from.
Upvote 0
It's cool. But do realize that machine is working the pump in 3 ways the manufacturer never envisioned:
1. There is a significant side load imposed by the crank as the pump swings back and forth - this may wear the seals and bushings on the pump housing/sleeve.
2. The hose is seeing a lot of flexing, more than you would ever do in hand pumping.
3. (as alluded by Gunnertones) - overheating due to the higher pump rate compared to hand pumping.
If I went this route I'd slow the speed down about a factor of 3 ~ 5, i.e. get a higher ratio gearbox. And rig the crank to a slider mechanism or Watts linkage to keep the force on the pump handle more or less in-line to the pump housing.
https://en.wikipedia.org/wiki/Parallel_motion#/media/File:Watt_Parallel_Motion_Simulation.gif
In the end, those parts "new" would cost around $300-400, not including the steel frame presumably welded from scrap. So, about 50% cheaper than the compressors available, and certainly more durable than the ones that are advertised for that amount.
Edit: forgot to embed the linkage link.
1. There is a significant side load imposed by the crank as the pump swings back and forth - this may wear the seals and bushings on the pump housing/sleeve.
2. The hose is seeing a lot of flexing, more than you would ever do in hand pumping.
3. (as alluded by Gunnertones) - overheating due to the higher pump rate compared to hand pumping.
If I went this route I'd slow the speed down about a factor of 3 ~ 5, i.e. get a higher ratio gearbox. And rig the crank to a slider mechanism or Watts linkage to keep the force on the pump handle more or less in-line to the pump housing.
https://en.wikipedia.org/wiki/Parallel_motion#/media/File:Watt_Parallel_Motion_Simulation.gif
In the end, those parts "new" would cost around $300-400, not including the steel frame presumably welded from scrap. So, about 50% cheaper than the compressors available, and certainly more durable than the ones that are advertised for that amount.
Edit: forgot to embed the linkage link.
Upvote 0
I would have a blast building something like that. He probably had all those parts lieing around the shop, just had to cobble it all together. That motor and gearbox are pricey items for sure.
Upvote 0
Fx came out with a similar setup that used antifreeze for coolant. A buddy bought one because it had all the fan fair for inovation. 1200 bucks ans it filled the rifle maybe 10 times before it crapped out.
. I still have the piece of junk in my shop. It was a good concept, but there was no longevity to it. I have a shoebox now.
. I still have the piece of junk in my shop. It was a good concept, but there was no longevity to it. I have a shoebox now.
Upvote 0