2 replies to this topic

[willd]

ihave always had trouble trying to find shell moulds that fit my mortars but a couple of weeks ago i came up with the idea of using clay for the mould so i got the cat litter i use for my rockets put it in my mill for an hour till it was dust then took it out and put it in a container and added water until i got a thick dough. i then rolled it round in my hands til i got a nice round ball then i left it for a few weeks to dry.i then put on a couple of layers of pva as my pva is waterproof when wet.
ive tested a small shell about 1" id and it worked fine ive got a 2 1/2" one drying currently ive found that they shrink a lot when drying and also they tend to crack allthough this can be prevented by adding pva to the water. The only trouble is when it comes to cut open the shell as you have to be careful about damaging the former. i expect if you wanted a more rounded ball you could put it in a star roller but you get fairly good results by hand.
could some people try this and tell me what they think :-)

[mrpyromx]

small shells, Golf balls. little bit larger shells, a dead logitec quick cam round ballons work wonders too, a little hard to start but you get the hang of it. you can also make a vacuum table and do them that way.http://www.halloweenfear.com/vacuumformintro.html

[willd]

i know but i have a bunch of tubes which a golf ball wont quite fit into