Silicone Mold Making: When To Use A Two-Piece Mold. Part 1

Last weekend I tried my first silicone project. I wanted to make a silicone mat for my electronics workbench. I did get a mat but because I mis-calculated the amount of silicone needed it didn't quite fill the mold which was the lid from a plastic tote from Home Depot. Yesterday it occurred to me that I could create a drawer organizer for the kitchen drawer that holds our cutlery. Does anyone know of a video that I could watch to prepare for this project. Also a better way of calculating the amount of material needed? Would MDF be a good material to use for the mold?

I want to make a silicone mold of a diecast school bus. Can anyone help point me in the right direction?

Amazing expertise! Thanks for such content! 😍

Great teacher

Thanks 🙏

I don’t quite know how I got down this rabbit hole but this guy is my new favourite human. He’s so fun to watch.

If there was a job opening in a shop with this guy I’d be there!!!! What a joy it was to watch this whole process.

What if i have a deep box ?
Cause the rubber inside it moves when i cast it

You are my great teacher ❤

YOU ROCKs!!!

Hello from the UK - I really appreciate your videos and I'm learning a lot from watching you work. Thanks for sharing!

i want to cast a large lens from the rear of a st1300 motorbike.with something so wide whats to stop the top mould from flexing and sinking into the lower mould warping the shape and reducing the thickness of the cast. should i use a more solid mould material or can i add wood dowels to the top mould to prevent it flexing? should i add multiple pour points and how do i calculate how much resin to use?

Cool 👍

Hi

The twinkle in your eyes as you work reminds me of the same twinkle in Adam Savage’s eyes.

Great tips . Thanks for sharing

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Robert, Robert never change I loved this video Your amazing and very funny

Stumbled on the channel and love it and your videos. What is “the pot” and what are those rectangular metal boxes behind you?

Hello Robert, love watching your projects. Watched you before, but this time I was totally intrigued! I have a project I've been trying to solve and need some help. Only problem is I am working on a shoe sting bucket. Need your help.

I sort of wonder why someone who has that part.. won't just print more. I can't imagine 3D resin printing more parts would be more expensive than having a mold made, the work that goes into using it, etc, etc.

nice job

Wished id see the cast..

You said the shape of the positive makes it a good idea to split your pour spout into two separate contact points. Why is that?

👏🏽🏆Great explanation of the different use cases

I like your method of making registration dots I may have to steal that method!

SUPERB ❤

Hey good morning, super grateful for your videos Rob! Find myself constantly referring back to them as a bit of a base source for moulding and mould making! Have a good day !

Very interesting hobby and top presentation!!
I would like to make a copy of a Viton ring for a bread oven (nor available anymore). It should resist 250°C for hours. Any suggestions for making the mold and the materail for the replacement ring is very wellcome. Thanks

Thank you that was smart so much easier

I have a question that I could use your expertise, Robert. I have, thus far, had two silicone molds fail on me, both of which were produced for a small part using a similar method shown in this video: where a part is laid flat, and a thin, skim layer is used to create a seal before the deeper, 2nd pour of silicone. For me, the part lays flush on foam-core board. My molds are all made from foam-core (which could be an issue; don't know...), and I have had a good amount of success prior, but lately, I cannot identify what the heck is going on! The issue is that the part somehow shifts in the silicone at some point in time within the pressure pot. During both silicone pours, the part is 100% flush on the floor of the mold box. All seems well. The mold is level in the pressure pot as well. However, pulling the mold out of the pot, inspection reveals the part has raised up into the silicone somehow. About 3-5mm tilt, or "sucking back" of the part occurs. Ever encounter anything like this? Initially I thought it was air entrapment under the part, but there are no air pockets in my case. And by rewatching this video, your gray box part has a HUGE air pocket in it, and apparently it did not cause an issue. Maybe the foam-board is compressing and distorting in the pressure pot?

Hi. How are you? I am from Saudi Arabia. I am very impressed with your work and learning from it
I made a two-part silicon template, but I had a problem. As the wax model dried out, it became very clear where to fill. When I tried to get rid of excess wax, the shape didn't look good.

I can't thank you enough for your patience and visual instruction you are definitely a master and I am so appreciative thank you

Great video Robert, thanks. Quick question is this the same way you would mold a vase? Is there a way to mold a vase that has a concave in the inner hollow?

Why not leave it in the wood frame? No worries about warpage, just compressive holding the two halves together.

all right! )))

This is some hardcore mold casting.

I was listening to a spotify playlist containing the epic movie score "Once Upon a Time in the West" composed by Ennio Morricone, from the 1968 western film of the same name, while you were taking apart the second part of the cast.

And when I saw how the mold came out... Forget about it! Epic moment :)

Great content!

Fantastic! Thanks for posting

Only dozed off once for like a min or two. Your a fabulous teacher!!

What are you referring to when you say "the tank"? I am brand new to your channel.

Dear Robert, highly appreciate your channel. Recently found it and been going through your videos (and subbed!). This video makes me wonder if you could make a video on the materials (mainly the rubbers and resins) you use and where to get them? Craft stores just won't cut it if you want to take on any project that is more than an incidental hobby crafting afternoon. Have been searching for it, but couldn't find a video commenting on such things. If you already made such video, my apologies. I'm sure I'll come across it at some point then.

THANK

do u sell any molds? looking for a mold to make 3ml storage containers id like to make 100 at a time if not more i guess the bottm mold and the lid mold

How would you cast steel ? Without damaging your furnace and whatever is being heated up

Robert, what is the best way to make a mold for a polyurethane transmission mount?

Watching these videos I feel like I'm hanging out around the grandpa that just knows alot of stuff I don't. Constantly learning

I like very much that you are a moulding specialist rather than just another sculptor,
but what are the maximum number of mould parts you've ever done? I've never done more than 2-part moulds, but I KNOW there are castings using more than 2 (things like say...3 headed Dragons)
finally, are you going to demonstrate how to make more than 2-part moulds here on you tube?.

Hi, could you help me? I need to create a silicone mold from a flexible silicone model. How do I do this without distorting my model?

How can I make a silicone mold of a glass egg trinket box?

Thank you for this, sometimes the ones that look easy are not!