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Hump and Slump Molds

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Project by BobAnderton posted 10-18-2015 04:07 PM 950 views 1 time favorited 7 comments Add to Favorites Watch

I made this mold set for a friend of mine who is into making pottery and also into cacti and succulents. With this mold set one can take a 1/4” thick sheet of clay and lay it into the slump mold, the hollow piece, and press it with the hump mold, which is the solid piece. Trim it and remove the hump mold and let the clay harden to a leather stage then unmold it and it can be glazed and fired. The result will be a tray that can be a succulent planter or just a tray for other stuff. The sides are tilted at 30 degrees from vertical and I used Matthias Wandel’s splayed miter joint calculator to get the bevel and miter angles of 26.57 degrees for the miter and 37.76 degrees for the bevel setting. Those double beveled angles can be cut on a tablesaw with the blade tilt and miter gauge or on a compound miter saw. I doweled the miters together to strengthen them and finished with water based polyurethane. The inner piece is sized so that when there is a 1/4” gap between them at the bottom there is also a 1/4” gap all the way around on the walls.

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw





7 comments so far

View waho6o9's profile

waho6o9

7180 posts in 2045 days


#1 posted 10-18-2015 05:37 PM

Very nice molds!

View Hawaiilad's profile

Hawaiilad

2897 posts in 2489 days


#2 posted 10-18-2015 08:30 PM

Wow, I guess a person could make all types of molds following your process

-- Larry in Hawaii,

View BobAnderton's profile

BobAnderton

219 posts in 2258 days


#3 posted 10-18-2015 10:10 PM

It ought to make the real pattern makers chuckle, right?

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw

View CaptainSkully's profile

CaptainSkully

1437 posts in 3026 days


#4 posted 10-19-2015 12:31 AM

Very cool! Thanks for the links. I’m always amazed when I find another mind-blowing thing that Matthias has done.

On a side not, now I want a margarita… Succulent… Agave… Nevermind…

-- You can't control the wind, but you can trim your sails

View Mark Wilson's profile

Mark Wilson

1767 posts in 531 days


#5 posted 10-19-2015 01:23 AM

Prac-tic-al Woodsmithery? Huh?

-- Mark

View Levex's profile

Levex

38 posts in 623 days


#6 posted 10-31-2015 02:30 AM

My wife is into pottery and would love these. Thanks for the inspiration, think I just found my next project.

View BobAnderton's profile

BobAnderton

219 posts in 2258 days


#7 posted 10-31-2015 07:40 PM

Levex, glad to hear someone else running with it, thanks.

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw

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