Author Topic: Making a sand mold without a pattern  (Read 2447 times)

Offline ironman

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Making a sand mold without a pattern
« on: September 08, 2015, 08:49:42 PM »
Here is a video showing how I made the mold when ductile iron was melted.   https://youtu.be/K_4eeVD4m9c

Offline vtsteam

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Re: Making a sand mold without a pattern
« Reply #1 on: September 08, 2015, 09:31:12 PM »
Now there's a method of casting I hadn't seen before! Excellent, and informative.

Ironman are you still using cement and sand mix for your core sand, or is it something else?
I love it when a Plan B comes together!
Steve
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Offline ironman

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Re: Making a sand mold without a pattern
« Reply #2 on: September 08, 2015, 09:55:31 PM »
No I found that cement sand cores are hard to dig out in tight pockets so I use more expensive binders (Fiberglass resin) I still think that cement sand is the cheapest core sand around.

Offline vtsteam

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Re: Making a sand mold without a pattern
« Reply #3 on: September 08, 2015, 11:01:14 PM »
Oh, fiberglass resin.....is it the common fiberglass polyester laminating resin, and hardener, or is it a special core sand resin made for the purpose?

The cores look very sharp and strong.
I love it when a Plan B comes together!
Steve
www.sredmond.com

Offline mexican jon

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Re: Making a sand mold without a pattern
« Reply #4 on: September 09, 2015, 01:26:18 AM »
Thanks for that  :thumbup: very interesting watch  :clap:
People say you only live once ! I say thank F@*K can't afford to do it twice.

Offline mattinker

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Re: Making a sand mold without a pattern
« Reply #5 on: September 09, 2015, 02:49:29 AM »
Thank you for a very interesting informative demonstration!

Regards, Matthew

Offline ironman

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Re: Making a sand mold without a pattern
« Reply #6 on: September 09, 2015, 03:03:49 AM »
The shop where got it from sells all kinds of resins for molding and fiber glassing, not foundry molds. When I told him I was going to use it for foundry cores he said I was crazy, he does not know me very well.

Offline tom osselton

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Re: Making a sand mold without a pattern
« Reply #7 on: September 09, 2015, 10:04:17 AM »
Very nice thanks for showing! I always look forward to your video's!

Offline vtsteam

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Re: Making a sand mold without a pattern
« Reply #8 on: September 09, 2015, 11:00:28 AM »
The shop where got it from sells all kinds of resins for molding and fiber glassing, not foundry molds. When I told him I was going to use it for foundry cores he said I was crazy, he does not know me very well.

 :lol:

It's a poor synonym for innovative indeed!
I love it when a Plan B comes together!
Steve
www.sredmond.com

Offline joshagrady

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Re: Making a sand mold without a pattern
« Reply #9 on: September 09, 2015, 12:27:31 PM »
Nice looking casting.

I assume that the advantage to using cores rather than a pattern is to avoid draft angles?  Or is it just faster?

Thanks for posting.

Offline vtsteam

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Re: Making a sand mold without a pattern
« Reply #10 on: September 09, 2015, 08:51:31 PM »
In this case it's the multi piece core-box that avoids the need for draft. Casting in a core doesn't necessarily avoid draft. This whole molding session taken together for the particular purpose is very cool.  :clap:
I love it when a Plan B comes together!
Steve
www.sredmond.com

Offline mattinker

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Re: Making a sand mold without a pattern
« Reply #11 on: September 10, 2015, 06:48:40 AM »
Nice looking casting.

I assume that the advantage to using cores rather than a pattern is to avoid draft angles?  Or is it just faster?

Thanks for posting.
Not only does it avoid draft, but the core boxes are much easier to make than a patern!

Regards, Matthew.