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Casting from an original carving #5: Constructing a mother mold - Part 1a

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Blog entry by Jordan posted 02-01-2012 10:49 PM 1631 reads 0 times favorited 11 comments Add to Favorites Watch
« Part 4: Creating the Mother Mold - part 1(brainstrain for you) Part 5 of Casting from an original carving series Part 6: Constructing the mother mold part 1b »

Today I am isolating a section for the mother mold – also called master mold but what a mother of a job it is!!!!

Imagine if I just pulled the rubber from the piece now, how would I keep it stable enough to pour something into? Thus the mother mold. (Please note: this is my method and by supplying this information, I do not wish to infringe upon styles used by others.)

What you must first remember is that it is made of a heavy non flexible material – I use plastic some use plaster. It will not come off if you apply it around corners so you must divide your sections for easy removal. Here I’m using putty which is not easily stuck to silicone but eventually you can tool it to stay.

I make the putty wall slightly higher to act as a flange to attach any other plastic sections and I will brush the plastic up as high as necessary for clamps or screws or whatever you will use to later adjoin the plastic pieces..

You must apply some type of mold release the the abutments of the plastic as well as the table or you will never get it off – ever!!!

This is the easy part, just wait til the inside!!!

I will add to this blog on this page as the day progresses so keep coming back to check for new pictures.

90 minutes later, the plastic paste is dry and I can remove the putty and the next application will butt up against the hardened plastic – remember the mold release!!!!!

Left side is plastic, right side is still the putty – hard to tell with the similar color

-- http://www.jordanstraker.com



11 comments so far

View Jimthecarver's profile

Jimthecarver

1122 posts in 2443 days


#1 posted 02-01-2012 11:46 PM

looking good

-- Can't never could do anything, to try is to advance.

View Moron's profile

Moron

4666 posts in 2551 days


#2 posted 02-01-2012 11:51 PM

Interesting for sure as I have a few carvings I would like to make moulds for

looking forward to your blog continuing

-- "Good artists borrow, great artists steal”…..Picasso

View reggiek's profile

reggiek

2240 posts in 1928 days


#3 posted 02-02-2012 01:45 AM

I have been following a bit to see what develops here….interesting blog for sure.

-- Woodworking.....My small slice of heaven!

View LittlePaw's profile

LittlePaw

1571 posts in 1736 days


#4 posted 02-02-2012 07:29 AM

Vehly vehly intelestink! I’m holding my breath for the next step – on second thought, I better keep breathing so I CAN see your next post, Jordan!

-- LittlePAW - The sweetest sound in my shop, next to Mozart, is what a hand plane makes slicing a ribbon.

View lanwater's profile

lanwater

3084 posts in 1592 days


#5 posted 02-02-2012 07:33 AM

Jordan,

I am trying to summarize for myself. please correct me if I am off.

We have the inside mold and the outside mold then we build the mother mold to keep the outside mold stable during pouring.

We still have not seperated the inside and outside mold from the gourd.

-- Abbas, Castro Valley, CA

View Jordan's profile

Jordan

1358 posts in 1782 days


#6 posted 02-02-2012 06:13 PM

Yes Ian, I am showing the process of creating the stable mold but I have not yet cut anything away as I don’t want to disturb the gourd’s original shape at this point. Once I make all of the mother mold pieces, I can then remove everything from the gourd which I will certainly show.
Thanks for following along.

-- http://www.jordanstraker.com

View Jordan's profile

Jordan

1358 posts in 1782 days


#7 posted 02-02-2012 06:52 PM

Actually, there will be 5 pieces Jonathan – go figure that one out, LOL!

-- http://www.jordanstraker.com

View Joe Lyddon's profile

Joe Lyddon

7732 posts in 2710 days


#8 posted 02-02-2012 09:51 PM

FIVE PIECES!

OMG!

This is getting better & better!

I had a strong feeling that it was going to be TWO… ... now I HEAR FIVE!

This… I gotta SEE!

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

View Jimthecarver's profile

Jimthecarver

1122 posts in 2443 days


#9 posted 02-03-2012 01:58 PM

I thought there may be more because of the inside area…interesting for sure.

-- Can't never could do anything, to try is to advance.

View EPJartisan's profile

EPJartisan

1056 posts in 1783 days


#10 posted 02-08-2012 02:03 PM

Mornin, got some questions for ya… I have always used plaster, what kind of plastic do you use? What about it appeals to you over plaster?

-- " 'Truth' is like a beautiful flower, unique to each plant and to the season it blossoms ... 'Fact' is the root and leaf, allowing the plant grow and bloom again."

View Jordan's profile

Jordan

1358 posts in 1782 days


#11 posted 02-09-2012 06:44 AM

I use Plasti – Paste, it dries much quicker than plaster and is less breakable.

-- http://www.jordanstraker.com

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