FLASK CONSTRUCTION

Many projects require a special size of flask, making them yourself is a necessity.

A molding flask has four parts.
1.Cope (top)
2. Pattern board (center),
removed after the drag is rammed and mold is flipped.
3. Drag (bottom)
This half normally has the pins.

4. Bottom Board

Favorite flask sizes (ID):
5" x 6" x 1 1/2"deep
12" x 12" x 3 1/2"deep
14" x 20" x 3 1/2"deep

 

After cutting lumber to the desired length,

 cut 1/8" deep grooves into surface to hold sand in mold.

Attach sections with screws and glue.

Shellac wood (or paint) to prevent moisture from being robbed from sand.

 

Guide Pins

4 sections of angled aluminum

2 carriage bolts

Drill 3 holes in each angled section, 2 holes attach to wood flask. One hole is for the carriage bolt.

 

 e

  Shellac wood (or paint) to prevent moisture from being robbed from sand. 

 


 

Bottom Boards.

 

 

 

 

 

By installing a latch that locks on one corner and hinges on the opposite corner the same flask can be used multiple times.
This is called a "snap flask". The mold is made the same way as a normal flask.


However, molds cannot be clamped, they must be weighted. Bricks were used to hold these molds together, carefully placed on top prior to pouring.


If the casting is too large for your flask, an extra flask section can be used to enlarge your flask.