CUSTOM PUMP

[CitySniper]

Nice Job Qb78guy!!..... I was hoping one of our members would try this for us, Keep us posted on how things work please.

[jimmie lee]

God bless the American entrepreneurial spirit! This is looking to be a viable alternative to scba tanks for direct fills for the Disco. Compressors are relatively affordable for most and for those without one this gives us a good reason to finally get one for our hobby and shop. QB78Guy, if you can document an easy to follow tutorial, step by step, with all parts and costs to accomplish this apparatus, you would do the membership here proud and many of us would be in your debt. This is another of those innovations to follow in the steps of Stearn, Sykes and Norm, among others and including,the guy in the video, to the sport of Air gunning. Time will tell as to the longevity of o-rings for the manual pump but at the moment this looks to be a promising and inexpensive solution that many of us have been looking for.

[FNG54]

I have no intention of trying this. I have no pump and I get tank fills for free about 2 miles from my house.

If I was going to do it I would think hard about adding some weight to the handle to assist in pushing it back down.
Not so much the compressor could not push the handle up but almost.

Don't know if it would work but I would try it.

[Bill G]

If it isn't too much trouble, how about you try to increase input psi by 10psi and document the change in number of stokes and the difficultly that accompanies such increases.  This too could be viable for higher psi fills. 

Now see what you guys have done!  what if you reg a tank that has only 2500 psi remaining in it for 50-75psi output and connect that to your pump.  The air is already dry and your gonna pay the same to fill it from 100psi as you are from 2500psi.  This could be a viable fill method for those small tanks.  this would be good for a few fills for out in the field.  The pump and big tank could be used around the shop/house for the tinkering projects and range work.  Dang, like I didn't have enough to do.

[Bill G]

FNG54, good idea.  could make it a bit cumbersome and top heavy.

[FNG54]

FNG54, good idea.  could make it a bit cumbersome and top heavy.

Clean out pellet trap, add heat, pour into sheets, wrap around lowest possible point.  Recycling 

[Ribbonstone]

MIght be a "win".

Moves 3X as much air, seems a manageable effort at least to 2000-2100psi.  Even if the seals wear out at that same3X rate, you're no worse than "even".

[bigriver]

QB78Guy, if you can document an easy to follow tutorial, step by step, with all parts and costs to accomplish this apparatus, you would do the membership here proud and many of us would be in your debt. Time will tell as to the longevity of o-rings for the manual pump but at the moment this looks to be a promising and inexpensive solution that many of us have been looking for.

I'm interested in the parts and assembly.  I'd be lost in Home Labyrinth(Home Depot) looking for these parts. A detailed tutorial would be greatly appreciated by many I'm sure.

[MustangMike]

hey guys, since this went as technical as it did. im going to move this up to the support equipment gate

[FuzzyGrub]

We need a marauder volunteer to see the effort to pump to 3000psi!     Will probably have to turn the compressor regulator down some, but still might be saving a number of pumps. 

[randall686]

Bump for info:
I'm about to spend even more money on a 4500 scba.. unless ??
I'm wonder about the 3000 psi fill as well although i'm that heavy (159)
The method I have always used for pumping is a controlled knee drop squat..vrrrt

[rsterne]

Perhaps having a set volume of air in a small pony tank (eg a 1 gal tank starting at 50 psi) feeding the hand pump would provide more pressure at the beginning and then progressivesly less as you fill the gun, automatically giving a faster fill initially and then a more normal effort towards the end.... Let's explore that....

To fill a Disco from 1000 psi to 2000 is a change of 69 bar times 8.2 CI (gun reservoir volume) which is 566 cu.in., or about 2.45 gallons of air at 1 bar.... A 1 gallon pony tank would hold 4.45 gallons (at 1 bar) when compressed to 50 psi gauge pressure (3.45+1 = 4.45 bar), and obviously 1 gallon remaining at 1 bar, leaving 3.45 gallons available before you are pumping against a partial vacuum.... more than you need for a Disco.... You should be able to vary the pressure in the pony tank to taylor the results to suit your strength and preference.... Gotta love it when a plan works out so easily.... Fill the pony tank to 50 psi, close the valve on the inlet (you wouldn't even need a regulator, just a gauge on the pony tank and close the inlet valve when it hits 50 psi), and start pumping.... By the time the gun has filled, the pressure at the inlet of the pump will have dropped to ~10 psi (gauge pressure) and the last pump would feel more "normal" but still delivering about 65% above the normal volume.... Adjust the pony tank starting pressure to taste.... A bigger pony tank would have a smaller pressure change during filling the gun.... and a smaller one could be filled to a slightly higher pressure and provide a greater rate of change of pressure (and hence effort)....

Who's going to try it?.....

Bob

[FuzzyGrub]

Bob, That sounds very plausible to me.  It didn't look like the effort to do the disco, was that bad.  This approach might be better for higher pressure mrods.   Then again, @ 250lbs, I don't find filling my mrod/prod that hard.   

For me, I'm looking for a way to detach myself from the compressor and hose.  Something easy to take in suv to my field range, cellar, or other location, that might be doing allot of shooting.  I already have a 5 gal portable tank, but would need to get a regulator and filter for it.  I think I can get most of the stuff at HF.   I can fill the tank to 100psi from my garage compressor.   Wondering how many fills it can "assist" with?     

Just waiting for the mrod fill assist report.   

PS: This method, would seem to be a great way to recharge the gun from empty. 

[randall686]

Yes, anyone hear of of a 3000 psi fill yet with this method???
Looks like an ice storm or I would be off to the nearest HF (about 45 miles) now.

[randall686]

Okay.. I'm going to try to not slide around and head out .. should have some info this evening about a 3000 psi fill.

[randall686]

Made it 10 miles and almost into a ditch.. oh well Guess i'll venture out in a few weeks or a month or so when i have time.

[FuzzyGrub]

I went and found my portable tank today.  Turns out it is a 9 gal tank with max pressure of 125psi.  That should be more than enough for a good number of "assisted" fills.  I should be able to make it up to HF during the week.   I think I'll add a water/oil/air filter to my compessor output, and an air filter and decicant dryer before the hand pump.  The portable tank will need the regulator and hose with a quick disconnect. 

[jimmie lee]

This looks to be a promising endeavor...please, those of you who are able, keep at it. To Bob, thanks for wading in on this; how could you not?! We all look to you for your feedback on these type innovations and the sport is better for it. To those willing to do the grunt work on this, thanks. This forum is great with some great minds...I'm excited to have an alternative method of filling my PCP's and really like Bob's idea of using a pony tank for assist.

[Qb78guy]

I took a better picture of the pump setup and added some information along with it.



I can't wait to find out how well this works filling to 3000psi as it could open the door to more guns for me!

I do not have a college degree just the ability to bolt stuff together, I believe that this is safe for ME but as with any experiment time will tell. Be safe!

[Tom SC]

  Just thinking out loud here. Two heavy duty bungees one attached to left handle one to right handle , both anchored to the pump base. The shop compressor pushes handle up the, the bungees help pull handle down.