the_hide Posted August 19, 2003 Report Share Posted August 19, 2003 A quick question on sprue/vent (not the pour hole) holes, where do most people find is the best place to put it(them) on a 2 part mold and what angle do you place them at. Ie in the tail venting up, mid body down etc. Quote Link to comment Share on other sites More sharing options...
RiverMan Posted August 22, 2003 Report Share Posted August 22, 2003 I have built probably 50 two-part molds over the years, but still don't consider myself an expert. Generally I put the sprue hole in a place that is at the far end of where I am injecting the bait. I do because I feel this give the plastic the best chance of moving the full length of the cavity. I also put the sprue in a place that will create the least amount of damage to the bait when I trim it off. I run the sprue at the same angle of the parting line so each side of the mold has an equal amount portion. I hope this helps some. Jed Quote Link to comment Share on other sites More sharing options...
Senkosam Posted August 24, 2003 Report Share Posted August 24, 2003 I've found a more effective vent system. I use 2 plastic coffee stirrers when I make the mold - one at 1/4 from top and one at 1/4 from bottom embedded into one side of the mold, perpendicular to the cavity. These can stay in the plaster or removed if greased up before inserting into the wet plaster. I no longer have hollow ended worms. The strirrers are hollow tubes and allow just enough space for air to escape. An alternative way would be to use greased up shish kabob, skewer sticks and insert the same way and then pull them out of the hardended plaster. Of course, you can put as many vent holes as you wish and even put the sticks through both halves of the mold. In fact this is a neat way of making 'legs' (i.e. millipede). (put the sticks all the way through the worm and cast the mold halves.) Sam Quote Link to comment Share on other sites More sharing options...
