[dsedy]

Ok so i want to make a mold. I have the basics down....

Make a mold box, put subject in mold box...pour solution, acrylic, RTV etc...

My question is that what i want to do is take the object and make a mold of just the outside of it...so it is just a 'shell' of the original piece and hollow completely inside....kinds of like an armor that would fit perfectly over the original piece.

The end result would be that the original piece would fit perfectly inside the relplica piece that i want to create.

Any ideas on how to do this?

Thanks Guys.

don

This post edited by dsedy 11:15 AM 09/12/2008

 

[DaveB]

Simple; make a 2 peice mold.

Pour some your molding agent into the mold box until the box is 1/2 full. Press whatever it is your molding into the agent until it is embedded 1/2 way. Allow the molding agent to cure. Apply a layer of release agent to all of the exposed molding agent in the mold box and to the insides of the mold box, but do NOT apply any to the object being molded. Fill the rest of the mold box with molding agent and allow to cure.

Turn the mold box upside down to remove the tope 1/2 of the mold. You may have to tap it a bit. Remove the molded object from which ever 1/2 of the mold it stuck to. Drill 2 holes into the top 1/2 of the mold. One at each end of the impression of the object that was molded. One of these you'll use to pour material into the mold, the other is a vent to let out air. If the molded object had a complex shape you may need more than one vent.

Put the top of the mold back into the mold box and start pouring.

What to use for a molding agent and the release agent depends on the material that will be poured into the mold. For soft plastic lures plaster of paris and vaseline work well.

 

[dsedy]

Dave thanks for the response. I am trying to visulaize this...

Basically in the above scenario you described i have two equal mold halves...when put together there is a hollow space on the inside that looks like the original piece....

Than I fill it with the agent.

Wouldn't this give me a solid object on the inside when it cures and i take both mold halves off?

new to this so sorry if i am wrong just trying to understand.

thanks

don

 

[MakoMike]

dsedy wrote:
Dave thanks for the response. I am trying to visulaize this...

Basically in the above scenario you described i have two equal mold halves...when put together there is a hollow space on the inside that looks like the original piece....

Than I fill it with the agent.

Wouldn't this give me a solid object on the inside when it cures and i take both mold halves off?

new to this so sorry if i am wrong just trying to understand.

thanks

don

Don,
I think you have the right. What shape is the object you're trying to make a mold for?

 

[dsedy]

Mike, Lets say it was a Pencil.

In a hypothetical scenario...I would take clay...and shape it around the pencil maybe 1/2 centimeter thick but would not cover the eraser end.

I would coat the pencil with a release agent...let the clay harden...than slide the clay shell off the pencil.....

I now would have an exterior shell of the pencil..that any other pencil could fit in.

In real life application the agent would either be some sort of liquid metal or acrylic plastic

Hope that explains what i am looking to do a little better

This post edited by dsedy 12:21 PM 09/12/2008

 

[dsedy]

bump...little help please

thanks

 

[dsedy]

wow...not one lounge lizard/piker can/will help me out with manufacturing a new innovative lure design??...


as you were folks

 

[Lattitudechange]

dsedy wrote:
wow...not one lounge lizard/piker can/will help me out with manufacturing a new innovative lure design??...


as you were folks
Kinda simple, Dave covered it. Why don't you stop over to my geeerage and we'll start fabrication..