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I am having trouble with having dimples in baits, my stinger and bloodied molds do fine, but my shad stinger molds in 1.5" and 2" are not coming out right. Is there something I am not doing right? I am not sure on temp, I need to get a new thermometer, but have shot baits for awhile and usually am real close on temps. Any suggestions? The molds are new from Jacobs baits, the 2" is a 40 cavity and the 1.5" molds are 10 cavity.
I usually try and make sure my hot plastic runs freely like syrup. When I inject a mold I push the plunfer slowly until it stops and then hold it there for about ten seconds. I use scissors to cut the plastic from the plunger. Usually I am heating until about 350 degrees.
What's probably happening is the plastic is cooling at un-even rates. Try topping off the sprue so when the plastic begins to cool and pull back into the opening it has plastic to take in . You may be un-molding too soon too. I'm in the opposite school of Ship and think you should try shooting a cooler plastic in those larger capacity molds. By all means have a digital thermometer on hand to check plastic temps. You don't mention what plastic you are shooting...hard, medium or soft. The softer the plastic the more challenging it is to shoot and dents are the first headache. I'd give Jacobs a call to see what he recommends.
try heating your molds up also injector let me know of this helps you.
I have that problem too from time to time. Have not tried to iron it out on whether I am shooting too hot or too cold but like the guys have said, it is either one or the other or Like CTom said, You may be demolding too soon. A lot of small details can mean a lot shooting baits from my experience.CF
I have the same problem too, I shoot the 2" shad from Jacobs I have tried hot, cooler, wait longer it has not changed it. I feel that it maybe the spur is too small on mine I have been told to hold pressure for a few seconds longer with the injector but have not tried it yet!!
I think you have the 40 cavity mold I am wanting to buy. That is a great bait if it is the one I am thinking about. Please let me know if you get the dimple thing figured out I am trying to decide whether to purchase it or not.Quote:
Originally Posted by mkeller
MKeller.....How big is the spru ? How wide is it? Some older Jacobs molds had a spru runner that was only about 1/4"-5/16" in diameter and that could be the source of your problem. He can open that up for you if its small. It should be 1/2" to 5/8" across. Something else to think about is your injector size. If the injector is too small in volume and you're squirting a large volume mold the plastic can have a tendency to do weird things. Just a couple more things to ponder.
Are you talking about the baby shed Stanger we have a large mold and shoot it without any problems.Quote:
Originally Posted by crappieseeker
I made the intake holes on Rick's molds bitter though I didn't have any problems but I wanted a bigger hole to use a dual injector.Quote:
Originally Posted by CTom
I tried the 1.5" shad molds this morning, I put the molds in a toaster oven at 275 while I got the plastic ready to shoot. They turned out fine, I think my main issue is my garage temp is in the 50s, I haven't got my little shop built yet for doing my jigs that will be heated and setup strickly for doing this. Usually haven't shot much this time of year but had some new molds and combos I wanted for upcoming trips. Thanks for all the help and ideas. I use MF regular plastic and also will have a guy I know at a machine fan shop probably open the throats for my dual injector, my 2" mold came with a laminate plate I was gonna play with first.
The spur on mine is 1/4" or about mine is the one that shoots 10 at a time and i get the dimples.Have though about drilling mine out to see if it would help.Cub48
yes I am talking about the baby shad stinger. Do you have the 40 cavity?Quote:
Originally Posted by snake River
Yes crappieseeker, that is the mold I purchased, great looking bait. I would hate to guess how many molds I have purchased from Rick, I prefer his molds over all he others, and I own some from all of them. He does a great job, gets to you fast, and will be there if you need him. I didn't contact him on this as I felt it was an issue I was creating, not the molds problem. I don't want my problems to reflect on the manufacture of the mold, I think you will not be disappointed with this mold if you decide to purchase it.
I have bought several molds from him in the past and they were all good. I never had a problem out of any of them. I sold off most of my molds though because I was trying to get out of making baits. However this bait from this mold has caught me more fish lately than any of the baits on the market. I am trying to decide if I want to pull the plug and buy the mold and make some more.Quote:
Originally Posted by mkeller
It is not the molds it is something we are doing. I have both the jacobs stinger shad mold 2" and the bears stinger shad 2". The Bears baits mold has a much larger sprew. I think cold molds has more to do with it. I think the plastic begins to cool at the tail so fast on the cold molds that the air does not get a chance to escape and it concentrates in a pocket on the sides of the main body of theses baits thus giving the baits dimples. I think hot molds will help eliminate this.CF
yes I do have the 40 cavity and I do not have any problems also have a laminate plate which I do not use our used dual injection either way I still don't have any problems. I asked Rick to build a 40 cavity baby shed Stanger mold for me and now he has them available on his site I've had other multi cavity molds made by Rick that I don't have any problems with either if I do I preheat the molds at about 325 and this is for real fine details on some plastic baits going back to the 40 cavity mold I shot over 3000 one guy last year all of them come out perfect using the 40 cavity mold.Quote:
Originally Posted by crappieseeker
like I told you try to heat your molds up also I'm curious on what type of plastic you guys are using to shoot sometimes a plastic that you are using may be to hard you may want to go to a softer plastic I realize that they won't hold up quite as well but you will get a good shooting was some of the softer plastics but I suggest strongly that you try to heat up your molds I do not have any problems like I've mentioned with use and Jacob's 40 cavity baby shad Stanger in 2 inch we also have four of the 10 cavity molds and I still don't have any problem with them.Quote:
Originally Posted by crappiefarmer
Snake River is right, I have not changed anyway I'm doing the plastic but I am preheating the mold and the baits are looking great. There is always a little panic when you invest that much in a mold and have problems, now its time to shoot some more and get to fishing.