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Adam Taper Jointing
April 8th, 2006 01:33 PM
This sounds like a possible Jointer, workpiece feeding issue.

The way the Jointer works is having the in-feed and out-feed tables at different heights relative to each other.

Once a workpiece is successfully fed past the rotating head's knifes, pressure should be applied to the out-feed table.

Otherwise, the workpiece will just end up having an uneven (or tapered) cut.

Also, the Jointer is not a thickness planing tool.

A workpiece is run through it for a reference flat and square surface for a thickness planer or sander to finish up, parallel to the reference surface and to desired width.

A jointed surface is also a superior glueing surface. Both, side can be jointed here because creating a "built-up" workpiece is not going to throw a whole lot of innaccuracy into your work.

The final cutting to size is going to determine the workpiece's acceptability.

Jointing both sides of a piece of stock would be "lucky" at best for the two surfaces parallelity (my word) and proper thickness.

The 90 degree adjustments is assuming the side fence is FLAT.

If there is a slow twist in the fence (possibly due to the casting not having enough "normalizing" time, it either needs to be lapped flat (if just twisting) or replaced if severe.

Test the side fence by placing it against a reference flat surface and see if it "rocks".

Flat surfaces include the Jointers in or out-feed tables or a cast-iron Table Saw's surface.

This could very well be a "manufacturing defect". The local Service Center should be consulted, if you don't want to "fettle" your fence.

If you do take the time (if required) to lap your fence against 80 grit sandpaper glued to a thick glass plate, you will be rewarded with an absolutely flat, fine finished (after progressing the sandpaper to 220) fence.

All tools are "kit" tools to some extent.

First thing to do with any newly manufactured Jointer is take a Rotary Tool, with grinding point, to it's rotary head's counter-bored knife retaining holes to debur and radius them.

I almost lost a finger-tip to this little lost "detail" of manufacturing.

Did I mention my Manufacturing Engineering degree?

And, NONE of the new manufacturers seem to remember this once common practice of deburring.

Hopefully this is enough info to get your projects back on track.
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