|
Post by youngling on Apr 24, 2007 21:41:40 GMT -5
Well sorry I was lazy last night and didn't post these but here are the second and final 3rd layers. Second layer Third Layer Alright pics of the mold taken off the helmet will come tomorrow.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 24, 2007 22:48:27 GMT -5
Nice can't wait.
|
|
|
Post by Socker on Apr 25, 2007 16:06:41 GMT -5
Humm has good aspect
|
|
|
Post by admin on Apr 25, 2007 16:23:51 GMT -5
Don't forget your mother mold. Don't take the rubber mold off until you have a mother mold in place, otherwise your rubber mold will not maintain it's shape while you cast your helmet.
|
|
|
Post by youngling on Apr 25, 2007 19:47:52 GMT -5
Ya thanks Captain. I am trying to think of what to use for my mother mold right now I am thinking of using plasti paste (thanks to mike who recommended it) but as of right now I do not have any and by the time it would arrive I am afraid the mold would permanently bond to the helmet.
I DON"T KNOW WHAT TO DO!!!!! Any help here would be greatly appreciated. Mike? Jason?
|
|
|
Post by pghfett on Apr 25, 2007 21:26:08 GMT -5
Are you using silicone rubber and did you use a mold release ? Considering how thin the rubber coating is you MUST have a mother mold in place prior to demolding. I would suggest a two piece mother mold if this is your first molding project. Also, another trick with thin molds is to layer in a cloth material inbetween the last two coats. This adds alot of strength to the overall thin mold. It appears your making a slipcast mold since it's not a two piece mold.
|
|
|
Post by youngling on Apr 26, 2007 21:01:22 GMT -5
Ya I am making a slipcast. It is pretty thin it is about 1/4 inch at the thickest parts. I like the idea of the cloth I am going to use that when I make my next mold. The rubber is made out of EZ~Mix 40 it is a urethane rubber. I used a release agent but I should have sprayed just one layer and let it dry for atleast half an hour and then misted it again. I got hasty and just put one overall coat and started casting.
Anyways the parts I have taken off already are pretty sticky but it will come off withought tragedy no doubt about that I just am worried that I might deform the mold a little. Well Mike what would you suggest? Should a make a makeshift mother mold right now out of plaster? Or should I jsut wait till I order some plasti paste? Also how would I take the mold off with the mother mold on?
Well thanks for the help Mike if you can just answer those last few questions that would help also if you have any more tips don't hesitate to share them
|
|
|
Post by pghfett on Apr 27, 2007 0:34:43 GMT -5
ok the rubber is urethane based - good enough for fg resin pulls. I would suggest taking your time and constructing a good two piece mother mold with materials made specifically for that purpose i.e. plasti-paste if that floats your boat.
Careful with ureathane based products - remember urethane sticks to ureathane and silicone sticks to silicone - if you were to use a urethane based gel coat in a urethane rubber mold be sure to use copious amounts of release agent because these products will stick together on a molecular level.
When you demold the parts they should not be sticky as you stated above. My concearn is the master you have pic'ed above appears to have a mixture of putty and paint layers on the master mold, hopefully this did not cause the rubber form completely curing due to chemicals in the paint or putty. This has happened to me on parts I painted and tried to mold, the paint caused the rubber not to cure.
On an added note to everyone - any master painted with Krylon "fusion" paints will stick to urethane rubber since this paint is formulated to stick to "all plastics". I found this out the hard way and I'm passing it along to save you folks from the 'ole trial and error method...
|
|
|
Post by youngling on Apr 27, 2007 19:57:50 GMT -5
Thanks for the help Mike I never thought of the rubber not curing but just so you know it is fully cured as far as I can tell. It is hard to explain but it is as dry as dry rubber gets. I do believe it is truly curred. Also with an opinion from you what would you say is better urethane or silicone?
Anyways I will have progress when I have my plasti paste but until then this is what I got.
|
|
|
Post by pghfett on Apr 27, 2007 22:13:01 GMT -5
Thanks for the help Mike I never thought of the rubber not curing but just so you know it is fully cured as far as I can tell. It is hard to explain but it is as dry as dry rubber gets. I do believe it is truly curred. Also with an opinion from you what would you say is better urethane or silicone? Anyways I will have progress when I have my plasti paste but until then this is what I got. Great that the rubber is cured - silicone vs. urethane depends on what your making the helmets out of lots of differences between the two. Silicone releases from everything except other silicone but is more expensive. Urethane is great for FG resin pulls and is cheaper than silicone.
|
|
|
Post by youngling on Apr 30, 2007 20:11:16 GMT -5
Allright guys I got this crazy Idea while I was thinking abouat SGB's Hard rubber cowl he might do. I was thinking about a vac formed hard vinyl cowl. Now just bear with me make sure you read the rest before you start argueing. Hanccock Fabricks (my fabric distributor) has this hard stiff vinyl that is gold. It has no fabric backing on it. If I just cut this the same size as my frame and duct taped it down. I could just wath it carfully in the oven and vac form it on a buck in the shape of a Galactic Marine cowl. One of the great things aboaut this would be that the cheek indents would already be in the face and it would also be kind of like a Snow Commander cowl flipping up at the shoulders. Another thing about it is that because the vinyl would be thinned out it would also be a little wavy and be able to catch the wind when running or a wind comes by. The advantages of this to a rubber cowl (not meaning to take away from SGB's idea) is that it would not be as hot. And it would be able to catch the wind. Also because the vinyl is gold it would need a coat of white spray paint. And you could even mask off the indents and leave them gold then mist them with white to make them the tan yellow color. I am thinking of making 3 different bucks. 1 that is made to my FG helmet that is kind non Cannon but still is it will have like a triangle in the middle of it. 2 it will fit my FG but will have the correct nose part so you could order an FG helmet with a correct looking nose. And last one that will fit my eventual Vac formed helmet. Here are some concept pics of the kind non cannon one. See how it has those creases in it and it kinda has a triangle in the middle. It is my first time trying out ink as an artist so give me a break please. Well anyways guys please leave comments and critiscisms.
|
|
|
Post by apollo on Apr 30, 2007 21:33:26 GMT -5
I think it would be pretty cool if you can get it to work. The biggest problem aesthetically that I'm having with mine is how to make the smooth tansition from vinyl to sintra cheek so it definitely sounds worthwhile at least to try out
|
|
|
Post by admin on Apr 30, 2007 22:01:52 GMT -5
Vinyl will melt on you really quickly. IF you could get it to suck down over the mold, it will tend to reform as flat as it can get. But then there is another problem, vinyl will not stretch the amount you'd need it to for vacuum forming purposes. At least at that size. You'd have to almost pre-wrap the mold, but it's still going to want to smooth itself out and reform. I had a tremendous amount of trouble with this while I was making my boots. It'll stretch and heat up, but I don't believe it would be an ideal material for vacuum forming.
Also, at such a small space, it will not catch the wind and flap around. The wind catches my vinyl kama, but it's nowhere close to cloth, or even like how the cowl moved in the movie.
|
|
|
Post by youngling on Jul 14, 2007 15:52:14 GMT -5
Allright well everybody I ordered A gallon of ROTO Wednesday and a Gallon of Plasti paste and some mold release. Hope to have it here late next week. If so be expecting. some progress on this I should be able to mold up a couple of helmets and still be able to make some deeces and the ammo boxes.
On a different note Hace you Mike ever used plasti paste as an alternitive to BONDO? BONDO is not availabe where I live for some weird reason and I need an alternitive that is stronger than woodfiller.
|
|
|
Post by apollo on Jul 14, 2007 16:54:16 GMT -5
Awesome man. I think I'm going to need a few extra ammo boxes from you as well (for another project), but I'll wait until my first order is filled to send you any more money so you don't get overwhelmed. I've been dying to see one of your helmets molded my friend
|
|