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Jaxom · Senior Member

There was a posting a few months back in the general forum about a guy who makes mechanized pump for pcp/hpa ags. As soon as I seen the youtube video of this in action I just knew I could make someting simlar but I need some advice before doing so.

In the video his demonstraion pump rocked a bit as it was being worked. I don't care for this, seems to me you're adding extra stress on the pump. Not withstanding you're also creating friction where the pump rocks back and forth.

In the design I would like to go with, picture an old steam engine, only the "drive wheel" is above the "piston" (the pump).

By using some rod ends and connecting rod, connected to the pump, just turn on motor and have it pump up my tanks or gun.

issues to resolve yet...

what size motor to use? don't need high rpm's but high torque would be a good idea.

add a shut off in so it turns off or stops pumping when it reaches desire pressure

design pumping frame so that I can easily pull pump out so I can take it with if I wanted to.

I know we've sorta discussed this before, but I really want to build this, other wise my project ag's will be sitting all winter long! <sigh>

Thanks,

Jax

kanyon · Silver Status Member

[quote="Jaxom"
In the video his demonstraion pump rocked a bit as it was being worked. I don't care for this, seems to me you're adding extra stress on the pump. Not withstanding you're also creating friction where the pump rocks back and forth.

Thanks,

Jax[/quote]

Extra stress.....the pump houseing & shaft are ALWAYS in line with
the pivot points top and bottom....STRESS???
If yer say so.....

Jaxom · Senior Member

I was commenting on that the point where the pump was pivoting would become a stress and friction point. Simply because it's moving. Remember, these pumps are held stationary by standing on them.

kanyon · Silver Status Member

Jaxom · Senior Member

I really wasn't talking about the shaft it's self. But I'm really not concerned about that issue, I have a solution for it. I just need a bit of advice on how to tweak some issues... Such as I mentioned in my first post...

What size in rpm's and torque should I look for?

How can I make an automatic shut off?

Also, while I'm thinking about it. I know many different companies make these pumps. Is there any difference in quality or features? They all seem to be around the same price of $200. If I'm gonna build this, wanna make sure it's around a good pump.