Lacrosse3803 Posted June 7, 2012 Report Share Posted June 7, 2012 Okay guys I made a 2 part pop mold of a senko and frog. I had problems with th not filling so I added a vent hole to each foot of the frog and the bottom of the senko. Still they would not fill and plastic would go in the vent holes I added a vent hole to the side of each so they fill 1/4 times but they usually have a dent. Any solutions guys? Quote Link to comment Share on other sites More sharing options...
nova Posted June 7, 2012 Report Share Posted June 7, 2012 How big are your vents? (diameter) They may not be big enough. Too big is better than not big enough. www.novalures.com Quote Link to comment Share on other sites More sharing options...
Lacrosse3803 Posted June 7, 2012 Author Report Share Posted June 7, 2012 They are around 1/16 inch in diameter Quote Link to comment Share on other sites More sharing options...
nova Posted June 7, 2012 Report Share Posted June 7, 2012 I always make mine with 1/8" minimum. Another thing to look at is the diameter of the pour spout you have made for the sprue. That should be a minimum of 1/4" diameter. www.novalures.com 1 Quote Link to comment Share on other sites More sharing options...
CrabbyBass Posted June 7, 2012 Report Share Posted June 7, 2012 My vents are usually 1/16" as well. Are you hand pouring or injecting? With my pop molds, I use those cheap plastic injectors from Jann's and they work well for me. I think that might work out for you. I would buy a few because they do not last long. Quote Link to comment Share on other sites More sharing options...
nova Posted June 7, 2012 Report Share Posted June 7, 2012 My vents are usually 1/16" as well. Are you hand pouring or injecting? With my pop molds, I use those cheap plastic injectors from Jann's and they work well for me. I think that might work out for you. I would buy a few because they do not last long. I could show you scars from when I tried those darned things. Be very carefull. www.novalures.com Quote Link to comment Share on other sites More sharing options...
CrabbyBass Posted June 7, 2012 Report Share Posted June 7, 2012 I could show you scars from when I tried those darned things. Be very carefull. www.novalures.com Thanks for the warning. I can see how they can be dangerous. Quote Link to comment Share on other sites More sharing options...
Lacrosse3803 Posted June 7, 2012 Author Report Share Posted June 7, 2012 I'd add a picture but it doesn't seem to let me from my phone Quote Link to comment Share on other sites More sharing options...
Lacrosse3803 Posted June 7, 2012 Author Report Share Posted June 7, 2012 Okay first I'm pouring Second I made the pour hole a lot bigger with no luck. The head came out hollow unfortunately Quote Link to comment Share on other sites More sharing options...
nova Posted June 8, 2012 Report Share Posted June 8, 2012 Okay first I'm pouring Second I made the pour hole a lot bigger with no luck. The head came out hollow unfortunately Easily fixed. Once the mold is full the plastic starts to cool and shrink. As this happens the liquid plastic getts sucked down into the mold creating the hollow. To solve this just keep topping off the sprue until it stops getting sucked down. Another hint to getting the legs full is to pour your plastic just a little hotter and make sure that the plastic goes into the mold without hitting the sides of the entrance hole into the mold. www.novalures.com Quote Link to comment Share on other sites More sharing options...
Lacrosse3803 Posted June 8, 2012 Author Report Share Posted June 8, 2012 Nova i have tried topping it off multiple times and it still ends up hollow. The feet always fill it is only the head that has the problem. Quote Link to comment Share on other sites More sharing options...
nova Posted June 8, 2012 Report Share Posted June 8, 2012 (edited) Are you topping off while it's still liquid? On second thought I would like to see a pic of the mold. It's possible that the main body is so big that it's center is remaining liquid longer than the head and sucking the pastic from the head. www.novalures.com Edited June 8, 2012 by nova Quote Link to comment Share on other sites More sharing options...
CrabbyBass Posted June 8, 2012 Report Share Posted June 8, 2012 Make sure the plastic is hotter than normal so that it pours thinner. As Nova said, keep topping it off until the air bubbles stop rising to your pour hole and then fill it some more. When pouring frogs I always have molten plastic run down the sides of the mold. It is easy to clean off. Keep the mold vertical and let it set longer as the body is thicker and it takes longer to cure. Quote Link to comment Share on other sites More sharing options...
Lacrosse3803 Posted June 8, 2012 Author Report Share Posted June 8, 2012 here is the mold you guys only one part though Quote Link to comment Share on other sites More sharing options...
mark poulson Posted June 8, 2012 Report Share Posted June 8, 2012 I have a POP mold that didn't pour right, but there wasn't enough meat in the wood frame to enlarge the sprue holes. So I wrapped the top of the mold with duct tape, and let it extend up 1". When I pour the mold I fill the duct tape reservoir with hot plastic, and don't have any more problems with voids or shrinkage. I learned from that mold to make my wood lure boxes out of 3/4" material, so I can have larger sprue holes. Quote Link to comment Share on other sites More sharing options...
JSC Posted June 8, 2012 Report Share Posted June 8, 2012 X2 Mark ... More reservoir Quote Link to comment Share on other sites More sharing options...
CrabbyBass Posted June 8, 2012 Report Share Posted June 8, 2012 (edited) The side vents might be causing your issues. Try filling in the side vents with pop and see if that helps. I only vent the bottom of the mold. You just need a way for the air in the mold to escape while the plastic is being poured in. Too many vents may do more harm that good because as the plastic cools it shrinks and pulls in air and also causes dimpling. Edited June 8, 2012 by CrabbyBass Quote Link to comment Share on other sites More sharing options...
Lacrosse3803 Posted June 8, 2012 Author Report Share Posted June 8, 2012 At this point I think I'm just going to make another mold, thanks guys. Quote Link to comment Share on other sites More sharing options...
