EDGE GUIDE ADJUSTER
Both of my edge guides (mortising
jig and edge of stock
guides) must be adjusted for each new application; an
arbitrary setting is rarely right where you want it. The
adjustment can translate the cutter pathway centerline, facilitate
a pathway greater than the cutter diameter, or both. Translation
of the cutter centerline can be done with a setting change of the
edge guides or the guide rods can simply slide to a new location
within the casting. In the latter case, the 2 hold down
screws/knobs on the casting are loosened and the router is
relocated a measured amount.
It is customary & essential to start an edge guide cut with a calibration cut. This is the case no matter what the edge guide design may be. From the calibration (test) cut you can determine how much the guide(s) or rods must be moved. If the guide(s) has to be moved it can be translated as follows (without the accessory below):
If the goal was to produce a .50" dado from 1/4" cutter, you'd
start with 2 edge guides against the work with a 1/4 spacer
between the work & one of the edge guides.
In this case the cut will probably start very near .50" but its centerline may not be where you'd like it to be. In this event, we have to move the router on its rods without changing the distance between the edge guides.
To move the router (a measured amount) on its rods without disturbing the edge guides:
The new edge guide adjuster is designed to assist in making
the space adjustment between 2 edge guides for mortices, slots
etc. It can also be used to translate the cutter centerline when
only one edge guide is in play. Let's start with 2 edge guides
snug against a parallel workpiece. To open the cutter pathway (of
a mortise e.g.) you first measure the diameter of the cutter and
subtract that number from the desired width of the intended cutter
pathway. This number is duplicated with a spacer-feeler gage,
adjustable parallel, gage block, drill rod, sheets of "Post-it" or
whatever. Now you slide the acrylic adjuster up against one of the
edge guides separated by the spacer.
Lock the adjuster, remove the spacer, unlock the edge guide block & slide it up against the adjuster. If you spent more than 1 minute on this adjustment you should report yourself to the metrology police for disposition immediately.
The cutter pathway will be opened precisely by the amount of the spacer. If the starting pathway is too wide, slide the adjuster against the edge guide block and lock the two intimately together. Now loosen the edge guide, place the spacer between the guide & adjuster, and lock the edge guide. This maneuver shrinks the cutter pathway exactly the amount of the spacer.
Tho not as sweet as an adjustable edge guide it is accurate to
.001", fast, simple to use, and low tech, nuthin' to break. The
12mm Acrylic blank is fully machined, deburred, flat and contains
2 non-marring all brass set screws. It is sized to overlap your
edge guide block and therefore will be easy to handle in
One size does not fit all,however; you must dictate router model number for the correct adjuster.
*The Starrett adjustable parallel is not part of this package.
Email for questions or
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Copyright © 2009 Pat Warner
Last modified: Mon Nov 2 06:46:13 PST 2009