Thread: Twinjector Disaster

I have not done a twin injection. However, I did run across this a similar problem with a bass worm mold that I was injecting, The problem I actually figured out was over clamping. I was actually closing down the small vents which were designed to let the air escape so the plastic was finding a lesser path of resistance. I actually had to file the vent grooves slightly. The problem went away.

Did you get your twinjector sorted?

Originally Posted by gmintimidator

Did you get your twinjector sorted?

Have not tried it yet. I have been making a lot of 2" twister tails as of late and have not had to have the twinjector. Will post an upsate when I do use it again. Snake River give me a couple tips on that and I will try them out.CF

Cool. Post if you have any issues. I've done a bunch of reading on the forum and there's a lot of good information, so its nice to return the favor and help out others.

I'm new at this twin injector and soft plastic injection.

Two clamps to use a set of welding clamps the ones with pads looks like vise grips with c clamp on the end. The other is a carpenters vise lowe and Harbor Freight has them for 20.00 mount it on bench. i have bought all kind of clamps and these are the best and don't rough your molds up. I don't heat my molds but i heat my injector and blending block after u get plastic to 350F let it drop to 300f then inject i would melt some scrap and use it till i got it down pat. I have a pancake grill i set my injector on to heat it the hot plate maybe getting it too hot in spots and melting your orings i set my grill on about 200f to warm my injector. Draw into injector slow and push into molds slow and steady. Cub48

Originally Posted by snake River

I noticed that you are using plastic clamps throw them in the garbage put your molds in a regular vice or clamped them with the steel vice or put them back together with the screws that come with it and give it a shot plastic clamps do not hold your molds tight is they should be I know because I've got about four pairs of them that I don't use also for people starting out I do not recommend the clamps of made out of plastic that they are selling on most of the mold sites is I've had the same problem time after time though I know were going to hear about it here probably some a guy say they never had a problem but I do not recommend using plastic clamps and I bet you $1 million what I told you it will work.

I agree with Bob. I am a vise user also. I stopped using plastic clamps and screws on my molds just because I do better with the screw type vise. This is what I use.

Ship the carpenters vice i use is tall enough that it clamps more in the middle. i have 2 of them yesterday i clamped 4 molds and may of been able to do 5. My vise has two 1/2"rods on the bottom the molds stack up don't have to hold them. Also u can bolt a wood board on it if u want i don't but that is something if u liked. Like i said i have tried almost everything as for as clamps i have c clamps they scar my molds works good clamping. I have the vise grip bar type in all size started with the small ones then bought the larger ones the bar is in the way and if u don't squeeze it hard it would blow out. I have even saw some use the spring clamps these were out of the question. I have tried regular vise getting the molds lined up was a problem The vise grip welding pliers the ones with the pads on them work great i used them before i bought the carpenters
vise they are about 6 bucks at HF. If i find a picture of the vise i will post it. Cub48