B1GB4SS Posted January 10, 2015 Report Share Posted January 10, 2015 Hi Guys and Girls, Am a new member to this forum. Ive been hand pouring for a number of years but most recently have been researching on injecting. Ive succumb to the drug that lure making is and bought my first mould and injector kit from BT. I have played around with them now for a couple of weeks but still finding things very difficult. I don't seem to get 100% baits no matter how hard i try. I have incomplete rings on my 639 mould along with some slight denting , although the denting only happens 30% of the time. I have kept a log on plastic temps , mould temps , injector temps, speed , pressure etc and cant find a pattern that works. could it be the mould and not me ? is there anyone out there with experience of this mould ? any hep would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Bassinfool Posted January 10, 2015 Report Share Posted January 10, 2015 Some molds, especially molds with very small appendages or rings on the body can be temperamental. Denting usually occurs when the plastic is shot too hot and the inside of the bait is starved for hot plastic causing a dent as it pulls in the plastic from the sides of the baits. If you're getting a lot of dents, try to shoot at a lower temp and see if that solves it. Warm your mold and injector, make sure you're not sucking up air into your injector by sucking up plastic, purge it back into the cup and then suck up plastic a second time and then injecting. Most of the time if you're getting voids in your baits you're sucking air into your injector and not getting it out. Just keep at it and don't get frustrated there's always a learning curve when you try new things! 1 Quote Link to comment Share on other sites More sharing options...
Frank Posted January 11, 2015 Report Share Posted January 11, 2015 I shoot that bait a lot , which one do you have? There are many options but some are just finicky. Cold molds will cause some no fill problems too. The rings are hard to fill just by design and this sound really funny but the color you shoot makes a difference. Dark bait don't fill as well as light or clear baits do. Denting for sure if from to hot a temp. I shoot mine at about 300 but that is with my equipment so it will vary a bit. Shoot the bait as slow as you can with a firm push at the end to fill the tail out. This will force most of the air out. Make sure your injector is smooth by oiling it with worm oil. Put the injector in plastic till the whole tip is submerged draw plastic and shoot. Make sure the injector is big enough for the mold and remember you cant use all the plastic in the injector because it cools to much so plan on using about 80% ,more if you heat the injector. Also remember if the mold and injector is heated it take longer to demold. 1 Quote Link to comment Share on other sites More sharing options...
B1GB4SS Posted January 11, 2015 Author Report Share Posted January 11, 2015 Many thanks for you replies. I do heat the mould and injectors on a heat plate prior to shooting there also lubricated, i agree my denting is only due to to much heat however i may have another problem and that is my injector sticks to the sprue so when i lift it clear it tugs the bait , could this lead to dents ? what is the cure ? more heat in the injectors ? I would like to get this bait (5" version) as perfect as i can including all rings so if anyone else has experience in shooting this mould be sure to leave me some advice PMs welcomed. Quote Link to comment Share on other sites More sharing options...
Frank Posted January 11, 2015 Report Share Posted January 11, 2015 You still did not say which mold you have but from the response I am guessing it is the single cavity top inject. If you are pulling the sprue out yes more heat will help but don't leave the injector on so long. I have much better results from Spikeit medium plastic too when hot it flows better. Quote Link to comment Share on other sites More sharing options...
B1GB4SS Posted January 11, 2015 Author Report Share Posted January 11, 2015 (edited) Sorry Frank, its the 639 mould from BT 5" 5 cavity top inject (each cavity has its own port). The reason behind in leaving the injector on is to keep pressure trying to reduce dents Edited January 11, 2015 by B1GB4SS Quote Link to comment Share on other sites More sharing options...
Frank Posted January 13, 2015 Report Share Posted January 13, 2015 Yes I kinda figured that it has a short sprue for a bait that big. Lower temp and it will be fine. What do you use to check the temp of the plastic? I have a video on you tube that I shoot that mold along with the 3.5 and the 2.5". You can see I don't wait at all when injecting. Look up franksrooty2 , I think it is the double barreled rack video. 2 Quote Link to comment Share on other sites More sharing options...
B1GB4SS Posted January 13, 2015 Author Report Share Posted January 13, 2015 Thanks frank, i watched your vid and am amazed you shoot it that quick, maybe i should be shooting it fast like that. Currently am trying to shoot it as slow as possible. Could you give me a little more info on your vid please ? Plastic temp ? mould temp?. I use a digital probe thermometer to check plastic. Quote Link to comment Share on other sites More sharing options...
