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Carl B
Fireman

USA
4147 Posts

Posted - 11/28/2020 :  6:40:59 PM  Show Profile  Reply with Quote
Your delivery person may ask for a different route!
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thayer
Engine Wiper

327 Posts

Posted - 11/29/2020 :  03:02:31 AM  Show Profile  Visit thayer's Homepage  Reply with Quote
Bernd,

I am glad to see the bad ratio was within tolerance, and the mixer-induced bubbles were not too much of an issue. I learned to always vacuum the silicone after mixing, but that does need a significantly larger container to let it foam up and not spill over.

Your molds look good, and should cast well. I look forward to seeing the first parts.
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Bernd
Fireman

USA
3947 Posts

Posted - 11/29/2020 :  12:15:03 PM  Show Profile  Visit Bernd's Homepage  Reply with Quote
quote:
Originally posted by Carl B

Your delivery person may ask for a different route!



Naw, I don't think he/she will. It's only 5 pounds per container and it's stated they may ship seperatley.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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Bernd
Fireman

USA
3947 Posts

Posted - 11/29/2020 :  12:16:35 PM  Show Profile  Visit Bernd's Homepage  Reply with Quote
quote:
Originally posted by thayer

Bernd,

I am glad to see the bad ratio was within tolerance, and the mixer-induced bubbles were not too much of an issue. I learned to always vacuum the silicone after mixing, but that does need a significantly larger container to let it foam up and not spill over.

Your molds look good, and should cast well. I look forward to seeing the first parts.



I think you need to be way off for it not vulcanize. Check my next post.

Thanks for the compliment.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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Bernd
Fireman

USA
3947 Posts

Posted - 11/29/2020 :  12:21:42 PM  Show Profile  Visit Bernd's Homepage  Reply with Quote
Here are the results of yesterdays pour.

Here are the three molds that were poured.



De-molded. I did destroy the sides of the gator board. I can always make new ones.



Close up of the smaller block wall mold. I donít see any bubbles, even after using the mixer that made it look like the yeast was rising.



As I mention in a previous post, that if you pour from about a foot up in the air and make sure you have a thin layer covering your master. Let is set for a few minutes for the bubbles to rise to the top and then pour the rest on top. Any bubbles that are left wonít show up on the surface that will be your facing surface on the part you are copying. Questions? Iíll be more than happy to ďtryĒ and answer them.

Next will be to test four different casting mediums. Hopefully I can start that next week.

Till then, have fun.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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deemery
Fireman

USA
8836 Posts

Posted - 11/29/2020 :  12:32:18 PM  Show Profile  Reply with Quote
I remember someone suggesting using Lego bricks to build mold boxes :-)

dave

Modeling 1890s (because the voices in my head told me to)
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Bernd
Fireman

USA
3947 Posts

Posted - 11/29/2020 :  4:35:58 PM  Show Profile  Visit Bernd's Homepage  Reply with Quote
quote:
Originally posted by deemery

I remember someone suggesting using Lego bricks to build mold boxes :-)

dave



Yes, that's another option I've seen used. Great from small square area molds.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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Michael Hohn
Fireman

USA
7202 Posts

Posted - 11/29/2020 :  5:51:05 PM  Show Profile  Visit Michael Hohn's Homepage  Reply with Quote
Fine mold-making, Bernd.
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Carl B
Fireman

USA
4147 Posts

Posted - 11/29/2020 :  6:28:25 PM  Show Profile  Reply with Quote
Well done Bernd.

ordered three types of casting material from the "Plasterguy"

Curious, which ones besides Hydrocal? I am currently studying the compression strengths of these different types for future use.
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Bernd
Fireman

USA
3947 Posts

Posted - 11/29/2020 :  10:20:48 PM  Show Profile  Visit Bernd's Homepage  Reply with Quote
quote:
Originally posted by Michael Hohn

Fine mold-making, Bernd.



Thanks Michael. Much apricated.

Bernd


New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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Bernd
Fireman

USA
3947 Posts

Posted - 11/29/2020 :  10:23:40 PM  Show Profile  Visit Bernd's Homepage  Reply with Quote
quote:
Originally posted by Carl B

Well done Bernd.

ordered three types of casting material from the "Plasterguy"

Curious, which ones besides Hydrocal? I am currently studying the compression strengths of these different types for future use.



Here's the shopping list, Fast Set Hyrocal, White Dental Stone, & Yellow Dental Buff Stone. Should be here by Dec.3.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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Tyson Rayles
Moderator

USA
13434 Posts

Posted - 11/30/2020 :  08:45:01 AM  Show Profile  Reply with Quote
Job well done Bernd!
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Bernd
Fireman

USA
3947 Posts

Posted - 11/30/2020 :  10:28:43 AM  Show Profile  Visit Bernd's Homepage  Reply with Quote
quote:
Originally posted by Tyson Rayles

Job well done Bernd!



Thank you Tyson. I hope I don't disappoint with the final project this is leading up to. I'm winging it as I go.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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Bernd
Fireman

USA
3947 Posts

Posted - 12/01/2020 :  10:15:45 AM  Show Profile  Visit Bernd's Homepage  Reply with Quote
Ok, the first phase of the roundhouse project has come to a close with the casting of seven molds this past week. Next will come the testing phase of casting material. I'm going to try hydrocal, yellow dental buff stone, white dental stone and Durham's water putty.

Looking at starting the first casting when the materials arrive. Looks like a quick trip to the hardware store to pickup the water putty.

Here's a picture of the seven molds.



Be back when the first casting is made.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds
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deemery
Fireman

USA
8836 Posts

Posted - 12/01/2020 :  11:45:03 AM  Show Profile  Reply with Quote
I love "experimental model railroading!" Looking forward to seeing your results.

dave

Modeling 1890s (because the voices in my head told me to)
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