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The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
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Unread postAuthor: jsefcik » Mon Aug 22, 2011 12:59 am

MrCrowley wrote:
1/2 inch copper pipe and for 1/2 inch pvc

The 1/2" diameters listed for copper and PVC pipes are nominal diameters (i.e., they're not actually 1/2" in diameter). Also, the diameter for copper and PVC changes depending on schedule, rating, manufacturer etc, so provide an exact diameter or you may end up with something that doesn't fit.

Edit: By the way, you could make a mold that simple from a piece of wood. You could even do what I have done in the past and hammered fishing sinkers in to a cylindrical shape to fit 3/4" copper pipe.


what do i do then?
plus i want a mold i can open and pop out the lead bullet
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Unread postAuthor: MrCrowley » Mon Aug 22, 2011 1:05 am

Figure out what PVC/copper pipe you're using, google for a specification sheet for that particular pipe and it will give you dimensions. All the necessary writing (for determining what standard it is) will be written on the pipe itself.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 22, 2011 1:08 am

jsefcik wrote:i gave a picture of something i want, about 1 inch and able to fit in 1/2 inch copper pipe and for 1/2 inch pvc sch40


This would have been more like it:

Image

Also, a slug made like that would need rifling to fly straight, otherwise a hollow tail or some ofther form of drag stabilisation is essential.

I would go with MrC's suggestion, take a section of barrel piping, seal off one end and pour in the lead. A proper mould is most likely out of budget anyway ;)
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Unread postAuthor: jsefcik » Mon Aug 22, 2011 1:19 am

jackssmirkingrevenge wrote:
jsefcik wrote:i gave a picture of something i want, about 1 inch and able to fit in 1/2 inch copper pipe and for 1/2 inch pvc sch40


This would have been more like it:

Image

Also, a slug made like that would need rifling to fly straight, otherwise a hollow tail or some ofther form of drag stabilisation is essential.

I would go with MrC's suggestion, take a section of barrel piping, seal off one end and pour in the lead. A proper mould is most likely out of budget anyway ;)


pouring lead into a piece of pipe doesnt do anything for me expect wasting my lead and time, if i fill a piece of pipe with lead duhh pvc will melt!

how would i get the lead out?
how much would a mold cost? 100-150 bucks?
if i go to fill the pipe with lead, i want to be able to stick the lead slug into my gun, i cant stick the pipe back into my gun
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Last edited by jsefcik on Mon Aug 22, 2011 1:22 am, edited 1 time in total.

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Unread postAuthor: MrCrowley » Mon Aug 22, 2011 1:22 am

pouring lead into a piece of pipe doesnt do anything for me expect wasting my lead and time, if i fill a piece of pipe with lead duhh pvc will melt!

Image
What happened to your copper barrel?

For the PVC, I already told you that you can use wood

how would i get the lead out?
how much would a mold cost? 100-150 bucks?
if i go to fill the pipe with lead, i want to be able to stick the lead slug into my gun, i cant stick the pipe back into my gun



Look what happens when you search something in Google...
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Unread postAuthor: jsefcik » Mon Aug 22, 2011 1:25 am

MrCrowley wrote:What happened to your copper barrel?

For the PVC, I already told you that you can use wood

Look what happens when you search something in Google...



yea, lead sticks to copper, i need to get the lead out, again i cant stick the lead slug with the copper around it back into my gun
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Unread postAuthor: MrCrowley » Mon Aug 22, 2011 1:28 am

yea, lead sticks to copper, i need to get the lead out, again i cant stick the lead slug with the copper around it back into my gun

Spray some cooking oil or other lubricant inside the copper. I have personally melted lead in copper pipe and removed it. :roll:
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Unread postAuthor: Crna Legija » Mon Aug 22, 2011 1:33 am

What not to do:

I what a mold

What to do:

Wanted to know if any one can machine me a mold. I'm in {insert country}

The out side measurements don't need to be very accurate but would like 0.5mm on the actual mold part and alignment bolts, you can just use a standard 118* drill bit. The block should be made of aluminium.
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Unread postAuthor: MrCrowley » Mon Aug 22, 2011 1:34 am

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Unread postAuthor: jsefcik » Mon Aug 22, 2011 1:46 am



Im not a tard,or just a plain brain dead kid
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 22, 2011 1:55 am

jsefcik wrote:I'm not a tard, or just a plain brain dead kid


No one said you were, just saying that there are plenty of options for cast lead projectiles which you should carefully and patiently consider before making vague requests for a machined mould which will likely cost you quite a few $$$ ;)
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Unread postAuthor: daniel0663 » Mon Aug 22, 2011 2:08 am

how much would a mold cost? 100-150 bucks?


:shock: custom ones, yeah....
But, i figure you don't really need precise molds anyway.
May i suggest something more, effective?
instead of an 'bullet' design, which will require rifling in your barrel in the first place. You can buy a ball mold for fishing weights for fairly cheap, They have all different sizes 8mm-28mm lead balls.

here is an link to what i am talking about.
http://www.ebay.co.uk/itm/BALL-LEAD-SIN ... 018wt_1199

i have brought one for myself and they work really well, some wadding is required for my barrel though.
good luck.
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Unread postAuthor: jsefcik » Mon Aug 22, 2011 3:04 am

daniel0663 wrote:
how much would a mold cost? 100-150 bucks?


:shock: custom ones, yeah....
But, i figure you don't really need precise molds anyway.
May i suggest something more, effective?
instead of an 'bullet' design, which will require rifling in your barrel in the first place. You can buy a ball mold for fishing weights for fairly cheap, They have all different sizes 8mm-28mm lead balls.

here is an link to what i am talking about.
http://www.ebay.co.uk/itm/BALL-LEAD-SIN ... 018wt_1199

i have brought one for myself and they work really well, some wadding is required for my barrel though.
good luck.


100-150 bucks is one hell of a rip off, doesnt cost that much to drill a hole and split the metal block in half, someone who charges that must be nuts :shock: :D
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Unread postAuthor: MrCrowley » Mon Aug 22, 2011 3:08 am

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Unread postAuthor: jsefcik » Mon Aug 22, 2011 3:16 am



i can get bullet molds for 25-40 dollars brandnew,
100-150 is a complete rip off!!!!!
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