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Pump modifying

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Pump modifying

Unread postAuthor: elad311 » Thu Oct 16, 2008 10:33 am

I have a great pump, and a want it to be always attached to my pneumatic cannon, but I need to modify it! see:
(the 1st picture shows the I need to modify it!)

Any ideas?!
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Attachments
Picture 20.jpg
the pump!
Picture 21.jpg
the pump!
Picture 22.jpg
I need to modify it!
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Unread postAuthor: mark.f » Thu Oct 16, 2008 10:36 am

OMG! YOU NEED TO MODIFY IT!

Ehm... I can't really tell anything from this post, other than the fact that that pump looks like a basketball pump.

Here's a tip:

I hooked a basketball pump up to a scrader valve on an air carry tank at 60 PSI before. The whole handle and pump cylinder blew out of the pump and flew across my room and into a door, denting it.

Now do you really want to use this pump?
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Unread postAuthor: jimmy101 » Thu Oct 16, 2008 12:47 pm

Like mark said, it looks like a pretty low pressure pump, probably something like 30 PSI max.

Looking at the picture, I would guestimate the piston diameter at about 1". That means to get to 100 PSIG you'll have to supply about 80 pounds of force. If the piston is 1.5" D then you'll need ~180 pounds of force to get to 100 PSIG.

EDIT: ENgrish
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Image

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Unread postAuthor: i-will » Thu Oct 16, 2008 1:41 pm

that pump will kill u. i had one and was pressurizing a bottle with it until the cylinder snapped. it happened so fast and i couldn't stop my hand from going into the shards. i got a few to the knuckles. wasn't so fun when i was bleedin all over my new shirt.

THROW IT AWAY. it's meant for low pressure (sports balls). it can't even properly inflate a bike tire.
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WHY PAY FOR IT WHEN U CAN MAKE IT?
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Unread postAuthor: psycix » Sat Oct 18, 2008 5:36 am

You could "modify" it by replacing the shaft with smaller diameter copper pipe, a new piston+rod and a custom check valve. Oh wait, now there is nothing left of the original pump....
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Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

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Unread postAuthor: john bunsenburner » Fri Oct 24, 2008 5:44 am

as every body said it! that pump can easyly kill you. make a better one from a thick pipe, or build a piston compressor, ally ou need is a strong check valve, a piston, metal rod, strong metal pipe, a metal disc, common sense and a strong electric motor!
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