Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

TwistyPuzzles.com Forum

It is currently Fri Jul 25, 2014 6:17 pm

All times are UTC - 5 hours



Post new topic Reply to topic  [ 14 posts ] 
Author Message
 Post subject: Two part molds, how to?
PostPosted: Fri Mar 22, 2002 4:42 am 
Someone tell me how to do it, pretend I know nothing when you discribe it, that way you wont assume I know something that I do not.


Top
  
 
 Post subject: Re: Two part molds, how to?
PostPosted: Fri Mar 22, 2002 7:06 am 
Offline
User avatar

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
wayne emailed me a list of things to do... if he would give me permission, i would copy and paste it here. Let me know wayne...


Top
 Profile  
 
 Post subject: molding
PostPosted: Fri Mar 22, 2002 8:06 am 
Offline

Joined: Tue Mar 14, 2000 9:11 pm
Location: Dubuque, IA area
I'd also love to get a copy of this list. I'm afraid that I might blow up my house or kill myself from the fumes or something if I don't know what I'm doing. I know Wayne has some info on this site, but I know that some things have changed like going from Silicone and Polyester to the PAM and PAK Polyurethanes.

Doug.


Top
 Profile  
 
 Post subject: LOL
PostPosted: Sat Mar 23, 2002 4:47 am 
Offline
User avatar

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
im afraid of that too,
considering my work space is 15 feet from my hot water boiler, but the glue fumes havent screwed up the boiler yet, only my eyes.


Top
 Profile  
 
 Post subject: vaseline...
PostPosted: Sat Mar 23, 2002 5:14 am 
Offline
User avatar

Joined: Tue Oct 09, 2001 6:14 am
Location: Orange County, CA, USA
That's what you would use to split the mold in any case. Use a nice thin film of vaseline between the two parts of the mold you want to separate.

My biggest hurdle so far has been getting the ratios perfect. So far I've ruined every attempt at making a two part mold because in every case I actually end up pouring multiple layers to get the "half" made just right and somewhere along teh line I inadvertently screwed up the ratio just a tiny fraction.

I'm finding that the molding material I'm using (Synair PAM333) is very unforgiving and even a 100 to 95 volume ratio is enough to ruin the mold. I'm just going to suck it up and mix larger batches together (more forgiving to the). At least I won't be ruining molds left and right, even if I'm "wasting" more of the PAM material.


Top
 Profile  
 
 Post subject: Por A Mold
PostPosted: Sat Mar 23, 2002 12:23 pm 
Offline
User avatar

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
hmmm...
I was considering ordering the Por-A-Mold S333. but, if this is a serious problem, then what else can i use?


Top
 Profile  
 
 Post subject: PAM S333
PostPosted: Sun Mar 24, 2002 1:14 am 
Offline
User avatar

Joined: Tue Oct 09, 2001 6:14 am
Location: Orange County, CA, USA
Well there's nothing specifically wrong with it and when done right it works great, but the trick is you have to make sure you have the ratios down as close to 1 to 1 for volume as possible. They do say to really keep those ratios close on the web page.

As I said, pouring out larger amounts will help to keep the ratios closer to the magical 1 to 1 volume ratio. It's just that I was pouring smaller quantities to not "waste" excess PAM, but the tradeoff was that I had a very small margin of error.


Top
 Profile  
 
 Post subject: Oh
PostPosted: Sun Mar 24, 2002 3:13 am 
Offline
User avatar

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
i guess ill stick with S333 then.
i have a question for you Jin:
What do you use to coat the clay parts?


Top
 Profile  
 
 Post subject: Hmm...
PostPosted: Sun Mar 24, 2002 3:28 am 
Offline
User avatar

Joined: Tue Oct 09, 2001 6:14 am
Location: Orange County, CA, USA
I don't know... I haven't gotten to the point where I'm casting custom pieces made entirely of Milliput yet. But I'd maybe give them a shot of synlube 351 and let it dry before I poured PAM over them. But so far I haven't used anything on some plastic pieces and they came out relatively easily anyway.


Top
 Profile  
 
 Post subject: Vaseline #2
PostPosted: Sun Mar 24, 2002 9:05 am 
Offline
User avatar

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
Anyone else know what vaseline is good for?
Speedcube treatment. But, it must be removed after a week. I know the reason,and i will post it in a few days. but, i want to see if anyone else knows first. Think of the ingridient PETROLEUM jelly


Top
 Profile  
 
 Post subject: Re: Hmm...
PostPosted: Mon Mar 25, 2002 3:28 am 
Offline
User avatar

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
are you making your molds from existing pieces? or making clay parts to make molds from?


Top
 Profile  
 
 Post subject: Yep, go for it.
PostPosted: Mon Mar 25, 2002 2:02 pm 
Offline
User avatar

Joined: Wed Nov 24, 1999 12:18 pm
Location: Palerang Shire, NSW, Australia
I'll put that stuff into the articles at some point.


Top
 Profile  
 
 Post subject: The process
PostPosted: Mon Mar 25, 2002 2:06 pm 
Offline
User avatar

Joined: Wed Nov 24, 1999 12:18 pm
Location: Palerang Shire, NSW, Australia
After Tyler gets the list up here (I'm at work so I don't have it with me to do it myself), I'll do up another article explaining the molding process in detail with photos etc.

This message has been edited by sausage from IP address 212.120.136.18 on Mar 25, 2002 7:07 PM


Top
 Profile  
 
 Post subject: Big List
PostPosted: Mon Mar 25, 2002 4:52 pm 
Offline
User avatar

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
I had to pretty much work it all out myself as there was noone else doing it when I started looking into the possibilities. In fact, I didn't even know that liquid plastics existed in that form. I had almost resigned to the fact that I would have to use wood to make a prototype.

I know where you are coming from with the idea of pressing pieces into a clay of some sort. But believe me, that would be bad if it was possible because you would get micro-distortions pushing a piece in and then pulling out. Best to think of it like this:

1.. Make a lego box or wall around your piece allowing a bit of space all around the piece.

2.. Place this box on something smooth and flat like an old CD case. Blue-tac it to the case or flat board .

3.. Mix up the silicone rubber and SLOWLY, pour in the mix bit by bit. You usually have a good hour to spend on it before it starts being unworkable, depend on which brand/specs you buy. Pour to half way up your piece.

4.. Cure 24 hours and then remove the piece to make sure all is ok with the first half mold.

5.. If it is, then put vasoline around the surface of the first half and put the piece back in.

6.. Mix up another batch of silicone rubber, put your piece and first half back into the lego wall, And pour in the mix to form a solid cube of silicone in side the wall

7.. Cure for another 24 hours and then carefully break open the two halves. They should split where the vasoline is.

8.. Remove your original piece form inside and you will have two good halves.

9.. Lube both halves with something like silicon spray.

10.. Mix up your polyurethane.

11.. Pour into both halves. Wait till curing is almost about to begin and place the two halves together carefully to avoid trapping bubbles in between the halves.

12.. Seperate after curing and you have a piece.

Ok, now all the above is a very simple overall guide. Your technique will vary and it really hard for me to explain exactly how I mix things and how I shove the pieces together etc. You will have a lot of failures before you perfect the art but I'm sure you'll catch on quickly enough. It is definately an art, and something each person learns to fine individually.

Let me know if this helps.

Wayne


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: Google Adsense [Bot], Yahoo [Bot] and 8 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Forum powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group