Custom Baits - Forum
Soft Plastic Bait Making => Getting Started / Customer Support => Topic started by: BiteMeBaits on 04/01/13 21:49 UTC
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So i figured out my bubble problem with my chub grubs but I have been having a constant problem with an air pocket it my 4" tube mold. The bubbles are in the same spot in each bait and usually about the size of a pea and always where the skirt meets the body. There is a small vent on the mold that seems to be clear of blockages. I have tried screwing the tube insert in and out but still getting this!!! Any ideas? If needed i can post a photo tomorow.. Thanks! Chase
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YES A PHOTO MAY BE HELPFUL
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here is a good example. You can see a bubble on each bait near the base of the tail. Also if the mold isupright, the bubble is obviously at the top part of the mold.
[img(http://www.caneycreekmolds.net/index.php?action-gallery;sa=view;id=1821)
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(http://www.caneycreekmolds.net/index.php?action-gallery;sa=view;id=1821)
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Ok so this isnt working in this tablet. Here is the link to the gallery http://www.caneycreekmolds.net/index.php?action=gallery;sa=view;id=1821
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I went out and looked at my G Tubes and I don't have that bubble ...so it may be a process issue with air in your injector and that is where the the bubble in the plastic ends up (maybe...!). Since air bubble rise...is it always on the up side of the mold? If for some reason you are injecting air late in the process....
More likely...Are you clamping at that particular spot...and closing off the vent? Clamping too hard? The purpose of the vents is to provide a place for the displaced air to go when you inject the plastic. If that vent is getting closed off the air will be trapped in the bait. I shot a couple last night and I clamp at the front of mold (sprue) and light about 1/4 of the way up from the end of the tail. Just enough not to get flash. I am not clamping at the junction of the body and the tail.
I don't clamp that mold very hard because I have had issues with tube molds in general not filling the skirt completely if I clamp to hard or don't have my plastic/mold up to temp.
There were some 4" G Tubes on sale a week or so ago that the owner had modified the vent at that position "per instructions from Jason".
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I went back and read that post and he was having the same issue. He concluded by saying:
Subsequent conversation experimenting revealed that simply double clamping the molds and using a slight hold was all that was necessary to get great baits
http://www.caneycreekmolds.net/index.php?topic=3368.0
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Ok yea i was clamping at the head and tail. i will try at each end and less pressure. If that dont work it looks like just some light score marks with a very sharp tool. Thanks i was running out of ideas! Chase
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Ok so i had a few minutes to play today. I tried moving the clamps to the very far end but still got the bubble. So i made three score marks like it shows. After making the cuts i poured two perfect tubes which has never happened so i guess for my situation the score marks were the trick. Thanks everybody for the help! Chase