I want to see if the tables of my jointer are within the manufacturer’s specifications for flatness, but I’m confused about how to do it.
Thompson Callahan, Las Vegas, NV
A:
Flatness isn’t the only important thing. To work correctly, the tables must also be parallel to one another.
To check for flatness, use a straightedge and a set of feeler gauges. Place the straightedge lengthwise along each edge and down the middle of both tables. If there is a gap of more than 0.005 in. over a large area, you’ll need to return the table to the manufacturer, or have it reground by a machine shop.
Now set the straightedge on the outfeed table with at least 2 ft. extending over the infeed table. Raise the infeed table until it just touches the straightedge. If the tables are parallel, there won’t be any gaps. If not, you’ll have to shim the ways. See FWW #142, p. 41 (Joiner Tune Up) for more on that.
Check for flatness first.
Use a straightedge and feeler gauge to test each table at each edge and in the middle.
Tables must be parallel to straighten boards.
Hold the straightedge on the outfeed table. Raise the infeed table until it just touches the straightedge and check for gaps along the length of the table.
Fine Woodworking Recommended Products
JessEm Mite-R Excel II Miter Gauge
The gauge has a quick and easy method for fitting the guide bar precisely to your tablesaw’s miter slot. This means the gauge can be recalibrated if necessary for continued accuracy. The face of the protractor head can be adjusted square to the table and also square to the guide bar. This ensures accurate cuts, and it, too, can be readjusted if the need arises. The protractor head has stainless-steel knobs and fittings and high-contrast, easy-to-read white numbers and increments.
The Dustopper attaches to a five gallon bucket, and collects 99.9% of dust before it reaches the vacuum. This saves the life span of your disposable vacuum bags and filters.
At high speed, the planer works fast and leaves a smooth surface. But the slower, finish speed produces an almost glass-smooth surface. Knife changes are easy.
With its graceful curves, cabriole legs, and ornamental back splat, a Queen Anne side chair is a bucket list build for many woodworkers. Dan Faia had a very specific Queen…
Become an UNLIMITED member and get it all: searchable online archive of every issue, how-to videos, Complete Illustrated Guide to Woodworking digital series, print magazine, e-newsletter, and more.
Check for flatness first.
Log in or create an account to post a comment.
Sign up Log in