Popular Woodworking 2000-10 № 117, страница 11
Ingenious Jigs continued from page 14 it in and out of the dadoes whenever you must readjust the height of the stand. The head of the carriage bolt is imbedded in a wooden knob with several tabs around the circumference. These tabs not only help you turn the knob, they allow you to calculate precisely how much you're raising or lowering the roller head and extension table. The carriage bolt is ^s" x 16 threads — which is 16 threads per inch. Turn it just one revolution and you raise or lower the stand 1/l6". One-quarter turn (one tab) moves the stands 1/64". The top of the carriage bolt butts against a small wooden "finger" that is glued to face of the post, flush with the bottom. I drilled a shallow countersink in the bottom of this finger. The domed head of the carriage bolt rests in this countersink. This, in turn, keeps the bolt from wandering or wobbling as you turn the knob. PW
3 15/16" 3/8" T-nut in 7/16" diameter hole with 1" x 1/16" counterbore Jack Base Layout 3 15/16" 1 1/2" 3/8" x 2 1/2" carriage bolt, washer and T-nut 3/4" radiu 1/2" 1/2" Insert the microadjustment jack into the dado slots just below the post. Let the post drop down onto the jack, then turn the knob until you can't see any daylight between the table and the straightedge. Jack Side View 12 Popular Woodworking October 2000 |
