sup1677 Posted May 23, 2023 Report Share Posted May 23, 2023 Hi, I don't know what the problem is... I've tried all the different temperatures, fast pressure, longer pressure on the injector, heating the mold, etc... and the result is just like this... Bubbles and holes at the top... Does anyone know what the problem is... could it be the form? Thx Quote Link to comment Share on other sites More sharing options...
Apdriver Posted May 23, 2023 Report Share Posted May 23, 2023 I just imagine it’s how the sprue is built with the constriction causing it. That said, when you cut the sprue off your bait it would be barely noticeable. Shoot it and go fishing. nice looking bait. Quote Link to comment Share on other sites More sharing options...
canuck 2 Posted May 23, 2023 Report Share Posted May 23, 2023 With the image I see it looks like two different shoots were needed to fill all the cavity above the top of the bait. A definite colour change in the bait and above it. What size of injector are you using. Quote Link to comment Share on other sites More sharing options...
sup1677 Posted May 23, 2023 Author Report Share Posted May 23, 2023 57 minutes ago, canuck 2 said: With the image I see it looks like two different shoots were needed to fill all the cavity above the top of the bait. A definite colour change in the bait and above it. What size of injector are you using. 100ml, injection hole diameter 7.5 mm....... the lure is 14 cm long (4.75 inches) Quote Link to comment Share on other sites More sharing options...
sup1677 Posted May 23, 2023 Author Report Share Posted May 23, 2023 1 hour ago, Apdriver said: I just imagine it’s how the sprue is built with the constriction causing it. That said, when you cut the sprue off your bait it would be barely noticeable. Shoot it and go fishing. nice looking bait. do you think that if there was a wider channel, the problem would go away? Quote Link to comment Share on other sites More sharing options...
Apdriver Posted May 23, 2023 Report Share Posted May 23, 2023 This issue has came up before with a mold that has that same sprue configuration. IIRC it’s a mold from Europe? Not sure if you removed it whether it would rectify this issue and would sure depend on the laminar flow of the work. You could introduce more issue if done incorrectly. I would prolly just live with it. Very minor. Quote Link to comment Share on other sites More sharing options...
sup1677 Posted May 23, 2023 Author Report Share Posted May 23, 2023 8 minutes ago, Apdriver said: This issue has came up before with a mold that has that same sprue configuration. IIRC it’s a mold from Europe? Not sure if you removed it whether it would rectify this issue and would sure depend on the laminar flow of the work. You could introduce more issue if done incorrectly. I would prolly just live with it. Very minor. I have 4 mold chambers, so I'll probably try experimenting with one. Otherwise, yes, Europe. .... I have the smaller versions perfectly fine, but the form is branched - one inlet and the baits are filled from the side Quote Link to comment Share on other sites More sharing options...
Fishinrev Posted August 17, 2023 Report Share Posted August 17, 2023 It's the sharp transition/edge/corner between the end of the bait and the vertical sprue. Bubbles need very little to hold them from smoothly rising to the top. Had that large bubble found a smooth transition at that particular intersection, it would have slipped around the corner and continued upward. There should be a radius instead of a sharp edge. You can create that by using a hand "deburring tool" that machinists use, or just using a very fine sandpaper and rounding the edge over. Don't over due it. Just getting rid of the sharp edge is all that is needed. Even a small polishing tool in a electric hand rotary device may be enough. That's my 2 cents worth... 1 Quote Link to comment Share on other sites More sharing options...
Fishermanbt Posted August 17, 2023 Report Share Posted August 17, 2023 Having same air pocket issues myself on a custom made mold. I’ll give your suggestion a try. Thanks Quote Link to comment Share on other sites More sharing options...
