It was made to comb mail #3: the pieces become a sub assembly

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Blog entry by Patternguy posted 02-19-2017 01:12 AM 1609 reads 0 times favorited 1 comment Add to Favorites Watch
« Part 2: Making use of a layout Part 3 of It was made to comb mail series Part 4: Rib and finger sub-assembly is finished »

Unfortunately, I didn’t capture every step of pattern construction and have no image of a rib assembly resting on the layout.

This view shows the assembled ribs with some details like fillets and radii being added to specific areas of the fingers. The side edges are left untouched at this point.

Also, the only draft so far is what is on the faces matching the stops on the layout.

The parting plane of the rib is defined by a line that run along the bottom of the fingers.
The fingers will mold in one direction, and the rib will mold in the opposite direction.

You can see from the layout which faces “draw” up from the parting, and those that “draw” down. The foundry terms are “cope” for up, and “drag” for down.

Draft will be applied to the sides of the ribs, but for now, they must remain parallel for the next step of construction.

1 comment so far

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1612 posts in 4169 days

#1 posted 02-19-2017 02:04 AM

I’m a classically trained Mechanical Engineer, so this blog really intrigues me. I learned CAD on the same machines they drew the Saturn IV rockets on at NASA. I love all things wood and metal. This is the perfect marriage of the two.

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

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