Machined PCP

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.

Is it any Good?

Yes
10
83%
No
2
17%
 
Total votes: 12
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Gun Freak
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Wed Apr 18, 2012 6:23 pm

Also if you dont own a shop compressor you can fill a soda stream tank and reg it down like i did, eliminating the need for a first stage!
In what way was that relevant to anything BtB said?
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pneumaticcannons
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Wed Apr 18, 2012 10:08 pm

Wow, great work so far man! Not sure how I missed this.
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Brian the brain
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Thu Apr 19, 2012 10:44 am

In what way was that relevant to anything BtB said?
I said the pipe insert was a brilliant find.
So...he tried to share another smart find.

Do you really get 100 bar out of the fridgy?
Damn...I never ran it that far.I got scared at half that pressure!
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
Goats spudz
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Thu Apr 19, 2012 3:05 pm

Brian the brain wrote:
In what way was that relevant to anything BtB said?
I said the pipe insert was a brilliant find.
So...he tried to share another smart find.

Do you really get 100 bar out of the fridgy?
Damn...I never ran it that far.I got scared at half that pressure!
yes ill upload a pic, the fitting most probably wont come off as its all hydraulic and welded onto the fridgy :D

Edit: Pics!!!
Attachments
Bluing paste, gives a really nice vintage finish
Bluing paste, gives a really nice vintage finish
stamped my initials L.G but it looks blurry because the tube is so shiny, also im going to do the model number &amp;quot;0001&amp;quot;
stamped my initials L.G but it looks blurry because the tube is so shiny, also im going to do the model number &quot;0001&quot;
P1011054.JPG (28.38 KiB) Viewed 2707 times
Grub screws, there long because there going through an aluminium action block aswell.
Grub screws, there long because there going through an aluminium action block aswell.
there Brian 100 Bar, had to turn it off just under because it shakes like crazy if the input isn't right.
there Brian 100 Bar, had to turn it off just under because it shakes like crazy if the input isn't right.
Where's my Chuck key?
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Brian the brain
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Fri Apr 20, 2012 10:18 am

there Brian 100 Bar, had to turn it off just under because it shakes like crazy if the input isn't right.
daredevil!
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
Goats spudz
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Fri Apr 20, 2012 11:38 am

:D


Im thinking of using a hydraulic cylinder and a lever attached to a reciprocating motor with 100 bar input to fill up-to 250 bar.

Diagram :)
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not sure about motor torque?
not sure about motor torque?
diagram.png (25.6 KiB) Viewed 2662 times
Where's my Chuck key?
warhead052
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Fri Apr 20, 2012 11:51 am

Wow, Goats, that's incredible. 100 bar out of a fridgy? Over 1,000 psi right? Your hydraulic pump idea may work.
Goats spudz
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Fri Apr 20, 2012 1:41 pm

warhead052 wrote:Wow, Goats, that's incredible. 100 bar out of a fridgy? Over 1,000 psi right? Your hydraulic pump idea may work.
1500 Psi, i think the cylinder may work for water or low volume air.
Where's my Chuck key?
Goats spudz
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Mon Apr 23, 2012 1:29 pm

UPDATE: machining steel front grips tomorrow, tube with milled flats on the side, and will cover up the dodgy stamping, im going with electro engraving for the writing as stamps dont always turn up right and look "un-proffesional" :D also i have settled on all metal construction but as it will be uncomfortable to carry, the stock and pistol grip will be 6061-T4 aluminium.
Where's my Chuck key?
Goats spudz
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Tue May 01, 2012 1:07 pm

Sorry i haven't posted in a while, i have been really busy with other things, anyway i had some time today to do some machining, after seeing wyz's hybrid i noticed the "cool but ergonomic" fill probe, so i had a look at these and they seem stupidly simple to machine so i had a quick go, this will go on my fridgy which i installed a switch on the starting unit and removed all the unused wires, now it only has one wire coming from it and a switch mounted nicely on the rear. i only need to do the grooves
Attachments
Attached to the fridgy
Attached to the fridgy
Switch
Switch
P1011063.JPG (30.36 KiB) Viewed 2532 times
nice switch mounted in starter unit
nice switch mounted in starter unit
Brass Fill probe needs o-ring grooves
Brass Fill probe needs o-ring grooves
probe.jpg (30.89 KiB) Viewed 2532 times
Where's my Chuck key?
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Gippeto
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Wed May 02, 2012 8:13 am

Probes are a great way to fill IMO. I think you may end up having some trouble with extrusion though...o-ring grooves need to be deeper.

If you haven't already done so, remember to vent the hole to prevent blow out if/when you get a nicked/extruded o-ring. The vent hole should be at least the same size as the oriface in the probe itself.

Have made a few of these...

Image

Image
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wyz2285
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Wed May 02, 2012 8:48 am

I agree, my grooves are deep (covers about 80% of the o-ring).
Still so you better vent it first then remove it.
CpTn_lAw wrote: :D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
Goats spudz
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Wed May 02, 2012 12:13 pm

i havent cut the grooves yet i had no time and had to go for an emergency, also im having a problem with my valve insert, when i push it in the tube it gets cut in the holes ( burrs )
Where's my Chuck key?
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Gippeto
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Wed May 02, 2012 1:50 pm

Just to clarify...by "vent", I'm referring to a "through" hole where the probe is inserted. Failure to provide pressure a place to dissipate in the event of a leak will cause the probe to be ejected...possibly with some real force behind it.

It SHOULD go without saying that the fill line should be vented off before removing the probe as well.
i haven't cut the grooves yet
I suppose you really DO need to make them deeper then. :lol:
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Goats spudz
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Wed May 02, 2012 4:24 pm

:D im cutting off the burred part and doing it like the one in your pic.
Where's my Chuck key?
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