Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

Molding making 101 by Kevin Matney

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Old 12-02-2014, 09:17 PM
  #1
Kevin Matney
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Default Molding making 101 by Kevin Matney

I will start out by saying I'm not a writer,but I can make a darn good mold. The plug is the first step. What the plug is a master of what you want to make. The better you make your plug the better the job will come out.
This a plug for a new Q/500 E, It has a wing saddle for a Viper wing.But the rest comes from a Mad Dog Q/500 of mine.
We will start out with some pics of the plug.
You will see some the work in the painting work to get it ready for the black paint.
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Old 12-03-2014, 09:02 PM
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Default Round 2

Time to make the parting board.This done so it can be a 2 part mold. This the top of the mold. Start out with mold clay to hold the plug in place on the back side of the parting board. Then on the top i use parifn wax to seal the plug to the paring board. Let cool down for a few hr. and start the job of scarping the wax to get a clean edge this is a 90 degree. So you can get a square edge.
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Old 12-06-2014, 10:03 PM
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Default Time to start making the mold

The first think I do wax the plug and parting board with Johnson paste wax. Let it dry and buff it off. Do this 3 times. Then time for PVA release agent,2 coats.
The surface I use is a aluminum fill epoxy surface coat. There is 2 coats. Let the first one dry to the touch just to leave your finger print in it. Then put on the next coat of surface coat. I do not let it start dry i start putting my fiberglass on. I do a 2 layer of 2oz ,then a layer of 4oz,and then a 1 layer of 6oz. Around the bolts I use to bolt it together,I mix up a batch of epoxy and cotton flock and Thixotropic Silica cabosil.This help hold up to all the bolting together.
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Old 12-07-2014, 05:42 PM
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Come on guys Please ask me some questions or is my pics that helpful.
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Old 12-07-2014, 06:15 PM
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I like it keep going
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Old 12-07-2014, 07:18 PM
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Default This the second part of the mold

What you will see next is what I use to build up the mold. It is called pattern dough.
It has 2 parts 1 part is yellow ,and the other in blue.When mixed together it will make it a light green. I use a mixer for this job Thanks to Christy i have this for X mas. I use a board to roll it out to get it about 1/2" thick. Then use a glove and some alcohol to smooth it out. Then 1 layer of 6oz fiberglass to lock it all together. and let dry over nite.
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Old 12-08-2014, 12:41 AM
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I've seen some molds and male molds made with pattern dough. Looks like a good option if you have a mixer. I got a set but never used it and I'm sure it is no good now. Gotta get the wife a mixer before I can get one of my own.

You're a fine writer. I like to say "If you can talk, you can write." It's called conversational writing and I know you are good at talking and explaining things. I've benefited from our chats. So please write more.

I hope to be able to make fuselages as nice as yours in the future.
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Old 12-08-2014, 08:19 PM
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I did it by hand for over 20 years. I have a done a 30% Ultimate mold by my self. That was a work out.
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Old 12-12-2014, 08:18 AM
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Looking good! We will give your method a try.
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Old 12-16-2014, 05:55 PM
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Default going to the second side

Time to pop off the first side from the parting board.And get it ready to start the bottom.Start out by getting all the wax and clay off the what was in the parting board. To help me hold the 2 half's together before I put some bolts in,you see were I used a counter sink bit. When I do the other side if will make the counter part of them.
When it all cleaned up time to wax it 3 more times and buff it off every time.I also use some masking tape to cover the fiberglass from the first side,this so the second side will not stick to it.And so I do not get cut by it.
Time now to get the bolts ready to go in.This so when it is time to put the 2 half's together I can with 10/ 10/24 caps
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Old 12-16-2014, 07:39 PM
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Quote:
Originally Posted by Kevin Matney View Post
What you will see next is what I use to build up the mold. It is called pattern dough.
It has 2 parts 1 part is yellow ,and the other in blue.When mixed together it will make it a light green. I use a mixer for this job Thanks to Christy i have this for X mas. I use a board to roll it out to get it about 1/2" thick. Then use a glove and some alcohol to smooth it out. Then 1 layer of 6oz fiberglass to lock it all together. and let dry over nite.
Pattern Dough?
What is this stuff, does it harden up after mixing, what is its primary purpose / what kind of places sell it? Would you use it to bulk up a wing mold?

Thanks, Kevin M.
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Old 12-16-2014, 07:42 PM
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May be this will help,Watch this
https://www.youtube.com/watch?v=0KH4lemzj6g
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Old 12-16-2014, 07:53 PM
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Kevin.... Thank You for taking the time to take and post all the photos. Have always wanted to make plugs and molds for some of my scale projects but didn't have the know-how.
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Old 12-16-2014, 08:00 PM
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Quote:
Originally Posted by wkevinm View Post
Pattern Dough?
What is this stuff, does it harden up after mixing, what is its primary purpose / what kind of places sell it? Would you use it to bulk up a wing mold?

Thanks, Kevin M.
For a wing mold I use end grain balsa to make that mold it is alot lighter.
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Old 12-27-2014, 09:39 PM
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Please follow this @
http://www.rcgroups.com/forums/showt...0#post30307310
E Q/500 racer
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Old 10-02-2016, 09:28 PM
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Look here for more info
Viper Dog E
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