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Injection Molding

Well, my first injection mold worked out pretty well. It was a crude first mold milled from some left over 5052. It worked. I didn't know how much my media would shrink on cooling and didn't know I needed to have some good sized reservoir until I was almost ready to inject my first piece, but I improvised. Of course I also learned the injector I bought was a toy at best and started making my own injector last night. Its about done. Just waiting on some high heat O-Rings to put it together. I'll post a picture of my fancy "cake decorator" when its assembled, but for now I have a picture of the mold and some of the end product posted here.

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Reply to
Bob La Londe
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very cool!

Interesting lures. When you get into production, let me know and Ill buy a couple.

Gunner

Reply to
Gunner Asch

Hey Bob,

Neat !!! I assume these are some sort of lure? Look to be about 3 inches long?

You might try keeping pressure on the injection until it cools, to keep the sags out.

Take care. Keep at it.

Brian Lawson, Bothwell, Ontario.

ps.... have you seen this???

Reply to
Brian Lawson

I could do that, but it would keep my injector tied up when it could instead be injecting the next mold. Seriously, all the commercial molds use a large reservoir, and then they toss the sprues back in the production pot to be remelted.

Reply to
Bob La Londe

I wasn't planning on going into production for sale. Just making a bunch of my own baits and molds so I always have something just a tad different than anybody else is throwing. On the other hand I might could have my arm bent to send you a bag or two in future trade for something or another.

Besides the only names I have come up with for that bait are either "Camel Toe" for the shape of the tail, or "Tapeworm" for the body shape. Now who is going to want to tell their buddies they caught that toad on the camel toe of a tapeworm?

Reply to
Bob La Londe

Usually the injection pressure is maintained until the gate freezes.

Reply to
Spehro Pefhany

I wasn't planning on going into production for sale. Just making a bunch of my own baits and molds so I always have something just a tad different than anybody else is throwing. On the other hand I might could have my arm bent to send you a bag or two in future trade for something or another.

Besides the only names I have come up with for that bait are either "Camel Toe" for the shape of the tail, or "Tapeworm" for the body shape. Now who is going to want to tell their buddies they caught that toad on the camel toe of a tapeworm?

Reply to
Bob La Londe

I guess that would depend on the media, but unless you are using a high end auto injection system with a nozzle heater you would run the risk of having your nozzle freeze up also. Then you would have to blow the plug out with pressure in the next mold which could mess up the flow and cause cold seams in your end product, or add some kind of nozzle cleaner. Seems like it would be be a lot slower than just having a reservoir in your sprues, and tossing the sprues back in the melting pot when you clean up your part.

Reply to
Bob La Londe

Maybe the guys using "Ugly Sticks" ;-)

Reply to
Leon Fisk

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