SpudFiles

JSR, depends on production methods. Your slug design would allow lathe turning from just about any machinable material. If made from zinc or lead, I'm thinking along the lines of a casting or a partially cast slug that is finished by swaging. I'll try a standard split die first, I think filling would be difficult if the walls are too thin. Preheating the mold is a must. It would be a 3 part mold. Yes, I will sharpen the nose.

Sharper nose, should have an even better CG upfront. .94 lb in Lead

That should do nicely, you could contact Gippeto as he's doing something similar for his own pneumatic monster:

JSR, I saw that thread a while back. I did not see where it mentions him either casting or swaging the slugs with a waist. I plan on trying a 1.5" version first. I will adjust round weight by making the skirt thicker or thinner. I'd be interested to see what this would do to a soft target. Water melons, TVs and plywood.

whoa, I call it an early night and look what happens! Drawings are great USGF. These are exactly what I was thinking. As far as melons are concerned I offer this as an early prediction http://www.gallaghersmash.com/pictures/029.jpg

jagerbond wrote:whoa, I call it an early night and look what happens! Drawings are great USGF. These are exactly what I was thinking. As far as melons are concerned I offer this as an early prediction http://www.gallaghersmash.com/pictures/029.jpg

A little off topic, but I actually built a Sledge-O-Matic for the youth group at church. It was a smashing hit. Love Gallagher's routine

Found some time to add the sprue.

Had a chance to machine 1 side of the mold assembly. Sorry about the clutter.

holy crap thats a nice mold i wish i had a drill press
still cant wait to see a finshed slug you should make a slug out of aluminum

Beautiful... though, stupid question, why isn't the sprue at the nose of the mould? Aren't you going to get an air bubble there?

twizi wrote:holy crap thats a nice mold i wish i had a drill press
still cant wait to see a finshed slug you should make a slug out of aluminum

I don't think it's really made with a drill press mate

And also you'd be hard pressed to find a worse slug than aluminum. Very lightweight.. You want a lot of weight, and if possible, strength. Lead, depleted uranium, carbides.. whatever you can get.

Though that looks truly awesome! Can't wait to see the slug it will make.

Unfortunately unless your going supersonic it will be rather inefficient but oh well.


(WRI)
1. Is for subsonic flight
2. Is for supersonic flight
3. Is for hypersonic flight

(most efficient for each)

inonickname wrote:Unfortunately unless your going supersonic it will be rather inefficient but oh well.


(WRI)
1. Is for subsonic flight
2. Is for supersonic flight
3. Is for hypersonic flight

I beg to differ ;P

JSR, We make lots of fishing weight, candle and chocolate molds too. To keep the cost of the molds down we make them from the smallest blocks we can. We simply advise our clients to tilt the mold till no bubbles appear in the castings. The parting line is kept a little rough too, it is not air tight. Air will escape easily but lead will only produce a tiny flash line. I made the other side a few hours ago, I will make the core on the lathe later. Oh, I placed the sprue on the side so the tip would be unblemished. There is a slight undercut in the sprue right where it meets the body so it will break off fairly clean. Just touch up with a utility knife.


Oh, as inonickname mentions, this is not your average drillpress doing the work It's a small CNC VMC (Computerized Numerical Control Vertical Machining Center), weighs about 3 tons. Cut each side of the mold in about 40 minutes.

holy crap thats a nice mold i wish i had a drill press

CNC router or mill is more likely. Nice pocket work too.

Jack, the mold will have to be vented ("scratches" radiating out from the cavity) to allow air to escape. The head pressure of the sprue will ensure that the mold is filled.

That slug WILL lay a serious hurt on "something".

Edit: Typing slow again. Must be the lagers.

40 minutes is flying. Must be nice to have REAL machinery.

Got a pic of the two halves.