Tenon does not fill top round part of mortise, but it's hidden

by the seat

Seat is screwed on through these holes. Do not glue

seat on, so that it can expand and contract slightly

with humidity changes

Screw rail is glued on after frame is assembled Measure dimensions for the rabbets off the chair for exaxt fit

Assemble back legs and apron, and front legs and apron. Then mate the parts.

Back frame assembly

3/8" Mortise in this edge centered laterally, 1,8 cm deep. Same

vertical position as side mortise.

35.2

31.0

This edge is vertical, and serves as the reference edge

' 6.6

This edge also vertical

92.9

6.6

Side mortise, 3/8" wide, 1.8 deep

3/8” wide mortises, 1.8 cm deep, parallel to front edge, 0.9 cm from front edge

Chain dimensions

Holes are off center a little bit, so that outside links protrude down a futther than the blocks.

1.5cm

.:> 0'9cm

0.3 x 0.3 cm chamfer

Pins made from large cut off

finishing nails

Drill these holes for a tight fit with the nail

Size these holes for a loose fit with the nail.Make blocks just a little wider than the thickness of your stock for the sprockets.

Front apron connects the two front legs.Back apron is identical, and connects back legs.

3/8" wide tenon, rounded on the bottom

39.6

Direction of wood grain

1 cm radius

The seat mounts are glued to the side aprons after the frame of the chair is assembled.Screws are screwed in from bottom to hold the seat.

Measure from your assembled chair to get exact dimensions of both rabbets.

Drill 5/32" hole through,Then drill 5/16" hole half way from top, to give screw more leeway as seat expands and contracts

3/8" wide tenon, in center

Bottom side is rounded, tip 7.3 cm from top. Both tenons the same

Chain sprocket

Tracked vehicle bottom view

5.8" dowel shaft. Springs push

it to keep chain tensioned.

Angle iron brackets made from bed frame angle iron.

Mine are old VW beetle wiper motors, but these can no longer be obtained. Most wiper motors would not mount as elegantly.