clelland Posted March 6, 2016 Report Share Posted March 6, 2016 (edited) I've designed my first Aluminum mold which I'll be CNC'ing shortly. Venting / Fill Channels / 3 Registration pins are all done. Plastic and Injector is on order from luremaking.com, but it will be about a week before it arrives, until I physically receive it, and I'd like to get the mold made before. I'm stuck on one thing, what do the dimensions of the Sprue Gate need to be to fit the following Doit Medium Nozzle: http://store.do-itmolds.com/Medium-Injector--4oz_p_325.html Thanks. Edited March 6, 2016 by clelland Quote Link to comment Share on other sites More sharing options...
Apdriver Posted March 6, 2016 Report Share Posted March 6, 2016 5/8 works fine. Quote Link to comment Share on other sites More sharing options...
clelland Posted March 6, 2016 Author Report Share Posted March 6, 2016 Thanks. I've added 2 vents to the 2 corners of the tip. The grubs are fairly small (7/8"), the vents i've made are 1/64" deep and 1/64" inch wide and I have 8 of them crisscrossing each grub. Does the venting sound about right, or is that too much air? Quote Link to comment Share on other sites More sharing options...
SlowFISH Posted March 7, 2016 Report Share Posted March 7, 2016 IMO you have ALOT of vents on that bait... if it were me - I'd have one good size one at the tip of the tails - then maybe a second smaller midway in the tail. You can always add venting - even if it's with a file by hand... if you have too many vents - you'll be pulling alot of extra material away from every bait. What you can do if you want the option of alot of vents and not want to file alot - is to cut a bunch of vents - but stop 1/16" of an inch short from actually entering the bait cavity - so there will be a very small wall between the bait cavity and the vent... if you need more venting - you'll only need to file away a very small area to add it. I hope that makes sense. I find it usually takes a couple tries to just get he right amount of venting... I tend to start with the minimum and add or make them bigger as necessary. J. 1 Quote Link to comment Share on other sites More sharing options...
DaveMc1 Posted March 7, 2016 Report Share Posted March 7, 2016 (edited) IMO you have ALOT of vents on that bait... if it were me - I'd have one good size one at the tip of the tails - then maybe a second smaller midway in the tail. You can always add venting - even if it's with a file by hand... if you have too many vents - you'll be pulling alot of extra material away from every bait. What you can do if you want the option of alot of vents and not want to file alot - is to cut a bunch of vents - but stop 1/16" of an inch short from actually entering the bait cavity - so there will be a very small wall between the bait cavity and the vent... if you need more venting - you'll only need to file away a very small area to add it. I hope that makes sense. I find it usually takes a couple tries to just get he right amount of venting... I tend to start with the minimum and add or make them bigger as necessary. J. Kind of goes against everything I have ever been told from several supplying the production end of the business and against everything I have learned with my own molds. I have always been told when it comes to soft plastic you cannot vent the mold too much. Every one of my molds (all my own customs from a few different machinists) are all vented every 1/4" - 3/8" starting at the gate right to the end of the bait. Every one of these molds all shoot flawless and effortless, including a 16 cavity 5" stick bait mold that will produce as near perfect baits as you can get (8-10 with dents for 1000 made) http://www.tackleunderground.com/community/topic/19762-to-many-vents/?hl=%2Bcarolinamike+%2Bvents#entry147809 Post #9 from CarolinaMike shows a prototype hand injection mold from Zorn Molds (they make the injection machines and large production molds) That is a well vented mold Edited March 7, 2016 by DaveMc1 Quote Link to comment Share on other sites More sharing options...
SlowFISH Posted March 7, 2016 Report Share Posted March 7, 2016 Kind of goes against everything I have ever been told from several supplying the production end of the business and against everything I have learned with my own molds. I have always been told when it comes to soft plastic you cannot vent the mold too much. Every one of my molds (all my own customs from a few different machinists) are all vented every 1/4" - 3/8" starting at the gate right to the end of the bait. Every one of these molds all shoot flawless and effortless, including a 16 cavity 5" stick bait mold that will produce as near perfect baits as you can get (8-10 with dents for 1000 made) http://www.tackleunderground.com/community/topic/19762-to-many-vents/?hl=%2Bcarolinamike+%2Bvents#entry147809 Post #9 from CarolinaMike shows a prototype hand injection mold from Zorn Molds (they make the injection machines and large production molds) That is a well vented mold Dave - You are right - I don't disagree that a well vented mold is a good thing.... but based on my experience (just as a hobbist) there is a point were you have such good flow through the mold - you wind up with alot of "hanging runners" that you'll need to pluck off - and if you're OK with that - then no big deal. And I agree - based on the bait, you may need a ton of vents.... I made a few ribbed baits that probably have 60-70 vents on them to get the ribs to fill... so I know what you mean regarding the need to vent well. I did look at a few other grub molds - and they have alot more venting than I expected - similar to above... but those were 3-4" grubs.... his above is at 7/8"... that's a small bait... doesn't mean he won't need the vents - but there could be overkill as well... and he should definitely have on eat the tail tip. J. Quote Link to comment Share on other sites More sharing options...
