robalo01 Posted April 12, 2009 Report Share Posted April 12, 2009 If price were not a consideration, would you prefer RTV or Bondo for a two-piece 5" stick mold with 4 cavities? Please don't say aluminum. This is custom design and I want to make my own molds, but I need about a 250 piece per hour production. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted April 12, 2009 Report Share Posted April 12, 2009 That is one complete cycle per minute. It is just about do-able. RTV or bondo resin will do the job, but why not PoP? Are you planning on just one mold? I would make several duplicate molds. It would slicken up the process and reduce the panic/rush. Dave Quote Link to comment Share on other sites More sharing options...
gone2long Posted April 12, 2009 Report Share Posted April 12, 2009 I've been working with the resin and love it, a little pricey I know but you can mill it, modify it where once RTV is set that's it. I would like to hear from someone who has used RTV in a 2-piece set up it seems it would be more difficult to keep the half Quote Link to comment Share on other sites More sharing options...
robalo01 Posted April 12, 2009 Author Report Share Posted April 12, 2009 I figure I need about 4-5 molds to work well. What I don't like about POP is the curing/sealing process. Quote Link to comment Share on other sites More sharing options...
Delw Posted April 12, 2009 Report Share Posted April 12, 2009 pop would be best and cheapest. rtv isnt very good for 2 piece molds. you will need about 8-12 to meet your quota cause of the longer curing time in pop and rtv. RTV cost about 1/2 of what alum molds cost. I would make them out of resin as its cheaper and 100 times better than both RTV and POP and easier to work with. Quote Link to comment Share on other sites More sharing options...
Bass-Boys Posted April 12, 2009 Report Share Posted April 12, 2009 Not sure on this,, but 250 sticks per hour with a 4 cav. mold or molds,, sounds like a lot of sticks.. mite not be doable??? do not think I could do it.. but thats me..It would take more than 1 person and a bunch of molds I think ??? Quote Link to comment Share on other sites More sharing options...
robalo01 Posted April 13, 2009 Author Report Share Posted April 13, 2009 1. Why is POP or Resin better than RTV for a 2-piece stick mold? I would think RTV would have a lower risk of have flashing, maybe better detail. Will it stand up to the heat for long exposures? Will it keep it's finish? 2. I think I can make 250 per hour with 15-20 cavities and a Presto pot. I used to make 120 per hour with 10 cavities and a Mic. i can make more molds if that the problem. From other posts I've read this isn't unreasonable. or ist it? 3. I make wood-framed RTV molds for high-impact foam with about 60-80 ml per single cavity mold. I think I can make a 3-cavity 5" stick mold with about 120-150 ml. I get RTV for about $25 per liter. That's condiderable cheaper than aluminum. That having been said. If things work out, I might have some alum molds cut. I'm not quite through tinkering with the design and I'll just have to see the cost-benefit (I'm sure it's there). Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted April 13, 2009 Report Share Posted April 13, 2009 Rob, you are absolutely right. As long as the RTV is framed, no problem. Minimal flash, with a well made mold. You obviously already have experience with RTV, so it is definately the way to go. The only real issue is the cooling time, as RTV is a very good insulator. This is why several molds would be a good idea, it won't speed up the process, but will eliminate any waiting time. As long as your hands are busy the whole time, you are at maximum efficiency, the rest is organisation. Dave Quote Link to comment Share on other sites More sharing options...
Delw Posted April 13, 2009 Report Share Posted April 13, 2009 1. Why is POP or Resin better than RTV for a 2-piece stick mold? I would think RTV would have a lower risk of have flashing, maybe better detail. Will it stand up to the heat for long exposures? Will it keep it's finish? 2. I think I can make 250 per hour with 15-20 cavities and a Presto pot. I used to make 120 per hour with 10 cavities and a Mic. i can make more molds if that the problem. From other posts I've read this isn't unreasonable. or ist it? 3. I make wood-framed RTV molds for high-impact foam with about 60-80 ml per single cavity mold. I think I can make a 3-cavity 5" stick mold with about 120-150 ml. I get RTV for about $25 per liter. That's condiderable cheaper than aluminum. That having been said. If things work out, I might have some alum molds cut. I'm not quite through tinkering with the design and I'll just have to see the cost-benefit (I'm sure it's there). with that kinda price on RTV you cant beat it. the count you want per hour is no problem, you will just need more molds than 4-5 more than likely double. RTV and pop takes a long time to cool as they don't dissipate heat. you might be able to put some pc case fans on the molds to help them cool also. the whole key is when your done pouring you last mold the first one should be set up. if you have to wait you lost valuable production time. even with alum molds and fans your probally looking at around 6-8 molds pouring before the first one cools. I have some customers that pour over 5k baits a week. he's running 40 molds at a time. using sta- warm pots. presto sta-warm or what have you will pour fast about 5-8 seconds per cavity if that. ( I am just going based on what he has told me as time wise. Delw Quote Link to comment Share on other sites More sharing options...
