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Jasonr

Wed Feb 15 2006, 07:07PM

Registered Member #167 Joined: Mon Feb 13 2006, 06:41PM
Location: Waterloo, WI
Posts: 54

Yes you could do that. However a spring means you need to be right by the rail! I tell you what I have no desire to be with in 25feet of mine. But that is not an apples to apples compare.

the coil gun no, as a coilgun requires the projectile to be ferrious material which is bad for railguns.
you want copper, alum, or graphite for the projectile.

Maz

Thu Feb 16 2006, 02:23PM

Registered Member #111 Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65

if you could build your own injector that does not use compressed air, more power to you. however building a compressed air injector is the easiest part of the whole project.
you seem to know what you need for the spring injection so i wont suggest anything,
for the air however, forget about CO2 and just go with regular old air. it is much cheaper in the long run.
get
(2) 1"pvc end caps, and
(1) small peice of 1" pvc(hardware stores usually sell for repairs.
get 1 package of schrader valves, these are just replacement valve stems for tires. i bought mine at w@lmart.
(1)high pressure blower. your bore is 1/4~1/2 so you dont need a ball valve.
(1)tube of instant gasket used for small engines.
and assorted fittings for your connections.(brass)
cut the pvc so it is AT LEAST 2" long.
drill a hole in end cap 1 for the brass fitting to conect to your blower, tap it.
drill a hole for your valve stem. im pretty sure it was 3/8 but im not positve.
insert the stem into the hole and make sure its snug.
glue the end caps to the PVC tube, hammer with rubber mallet so its nice and tight.
teflon tape up your fitting to the blower and the pvc and thread it into both. the other end of the blower also has threads you can use, so you can machine a block or glue the nosel into your design.
just remember, you need an accelerating tube which ever way you choose. so choosing where the flyway ends and the copper begins is a big deal.

good night and good luck
-Maz

J.Lanum

Sun Feb 19 2006, 01:21PM

Registered Member #161 Joined: Mon Feb 13 2006, 03:15AM
Location:
Posts: 20

Ok so I'm looking at some copper barstock on McMaster-Carr. Do I need the Mirror Like quality or can I go w/ the Unpolished one?

Michael W.

Sun Feb 19 2006, 03:24PM

Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324

It depends on whats cheaper, if the unpolished is cheaper, get it and polish it....You need a good contact surface between the rails and projectile so a surface without abrasions is probably best...

J.Lanum

Mon Feb 20 2006, 03:57PM

Registered Member #161 Joined: Mon Feb 13 2006, 03:15AM
Location:
Posts: 20

Part Number: 89275K113
$28.41 Each
ASTM Specification
ASTM B187
Shape
Sheets, Bars, and Strips
Sheets, Bars, and Strips Type
Square Bar
Length
36"
Length Tolerance
Â±1/4"
Width
1/2"
Width Tolerance
Â±.008"
Material
Alloy 110 Electronic-Grade Copper
Finish/Coating
Unpolished (Mill)
Straightness Tolerance
1/2"
Yield Strength
44,000 psi
Temper
Hard (H04)
Hardness
Rockwell F85
Tolerance
Standard
Specifications Met
American Society for Testing and Materials (ASTM)
Notes
Cannot be heat treated

Ok so this would give me a 1/2" bore, I'd be using a plasma armature, and I would be using 1092 J's. Any opinions?

Maz

Tue Feb 21 2006, 11:54PM

Registered Member #111 Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65

thats just a lot of power to be putting through anything

Self Defenestrate

Wed Feb 22 2006, 02:41AM

Registered Member #87 Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191

1.1kj sounds good. Your copper choice seems fine, a polished surface isn't any better. You also have to think of the bars leading to the rails, so you might want to look at some flat copper stock as well.

J.Lanum

Wed Feb 22 2006, 03:38AM

Registered Member #161 Joined: Mon Feb 13 2006, 03:15AM
Location:
Posts: 20

Self_Defenestrate wrote ...

1.1kj sounds good. Your copper choice seems fine, a polished surface isn't any better. You also have to think of the bars leading to the rails, so you might want to look at some flat copper stock as well.

Do you mean "bars leading to the rails" if I were using an injection method, because right now I don't think I have the the time to make one. I have around 3 weeks and 6 days I think.

Self Defenestrate

Wed Feb 22 2006, 03:54PM

Registered Member #87 Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191

I was talking about the connections from the caps to the rails, it's a bit easier to use bussbar rather than a whole bunch of wire.

J.Lanum

Wed Feb 22 2006, 05:56PM

Registered Member #161 Joined: Mon Feb 13 2006, 03:15AM
Location:
Posts: 20

So what you're saying is that I can use some copper flatstock and hook my caps in parellel and hook them to the rails? If I where to get wire what type would I need?

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