Pencil Box

Japanese Style with a Sliding Top

Trying to create a prototype of a sliding top box similar to a pencil box...I hope to then mass produce some as gifts.

The Model for this Prototype

Prototype Design and Build

Tongues on Top Lid and Bottom

Dry Fit

Glue up

Proto Look

Issues to Solve

Production Plan

 

Japanese Sliding Top Box

The proto-type will be based on a Japanese presentation box, made of paulownia wood, ~110+ yrs old...this long, narrow box was used to hold a document, a scroll that presented a military award after the victory against the Russians in the Russo-Japanese War in 1905.

The lid slides into rebates and the lid grab, when closed, hides the joint.

This box is 1-11/16 x 1-11/16 height and width and 18-3/4 inches long...our prototop wil be about half that length...

The Paulownia tomentosa is a deciduous tree that is extremely fast growing...called the world's fastest growing in some circumstances...it is also an aggressive invader in the US.

 

Paulownia as a wood product...it is a light and porous hardwood, yet it is proportionately strong ... the grain is usually straight with it has a coarse and uneven texture.

Paulownia was named after Queen Anna Pavlovna of Russia (1795-1865), and is sometimes called Royal Paulownia or Princess Tree.

Prototype Design and Build
shop cutoffs provided the 3/4 inch thick poplar blanks...resawn on bandsaw to ~3/8 inch thick and then thickness planed down to 1/4 inch , ripped to 1 3/4 inches wide...
grooved on P66...1/8 inch kerf using a Freud rip blade that cuts a groove with a flat bottom...1/8 inch deep...1/8 inch off edge...
miter cut these sides on the beta miter cut sled...a long blank, already grooved, is miter cut fat on one end...
and then flipped with stop block to mitre the short ends
...and then the long sides.
Tongues
the tongues on the top and bottom were cut with the Infinity 1/4 blade hidden into a scrificial fence to make a 1/8 x 1/8 tongue
Used a sacrificial backer to cross cut rebate on the short grain ends...used the Incra Jig
After some minor spelching and the edges not being co-planar, we tried using the Incra jig with backer...had some better success.
 
Rebates were cut cleanly...Infinity blade is great.
Dry Fit
All the pieces were clearly marked...
Top view
Marking off the tab pull...
Deeply scored to help define the kerf...
Used the Toshio Odate with a thin 1/64 kerf...
...the pull tab...
...pull tab placed on the top lid...no glue at this time.
Dry fit...taped as needed...
Glue Up
Laid out the four side pieces...indexed against a stop...laid out onto painters tape...
...joint ready for hide glue on the end grain.
Tape used instead of clamps...
...all glued up...
Proto Look

Light sanding with 220x on Rotex 90...box looked pretty good...the pull tab has not been glued yet.

The lid easily slid in the grooves...
Any variance in sizing or squareness of the top lid in relationship to the sides and ends was quite accentuated when viewed from the top...

So I reversed the top plate...this made all of the gaps disappear and look much cleaner.

End pull tab has not been glued at this time...

Side view after reversal...
This means the top is no longer coplanar with the top edges of the sides...but I liked the cleaner look...glued on the pull tab end.
During the prototype milling we created the grooves first and then mitered the ends...this miter cut caused some spelching in the grooves...started putting a 1/8 inch dowel in the slots to reduce spelching...worked pretty well.
Rubbed on a coat of amber shellac, shop mix 2#...
Just one coat left the look that I wanted...
Had to lightly sand off the raised fibers on the rebate...added bee's wax...slide top was a good friction fit.
Preparing for production...started gathering scrap boards...
...began planing boards to create multiple 1/4 inch thick blanks...cherry...maple...poplar...in the first runs.
Production Plan
After making the prototype, I drew up the pencil box in Sketchup...one of the long sides will look like this.
With measurements...
End...
End with measurements...
The pull tab end will be sawed at 1/2 inch from the top...creating the short end and the pull tab for the end.
The lid plate and the bottom plate will be 1 1/2 x 8 3/4...each will have a 1/8 x 1/8 inch rebate to create a 1/8 inch tongue to fit into the grooves in the sides.
The bottom plate installed into the three sides...
The top plate has the pull tab attached to it...
The box with the short end installed...
The full Monty...
Production plan to make two boxes...
PDF here

 

 

 

 

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