Operating and Maintenance Manual
©
HOFFMANN MU3 & MU3-D
• Version 7.205.00 • 01-2018
16
12
Selecting Key Length and Setting Routing Stroke
The machine is equipped with a routing height tape scale
(1) which is attached to the routing height adjustment bar
(2). The scale indicates the height the router bit will
travel into the material.
To adjust the height, simply loosen the top locking lever
(3), move the bar to the desired height and tighten the
locking lever,
Always use the longest Key possible to
achieve a tight joint on the face side of the
workpiece!
All Dovetail Keys listed on our website
have the recommended material thickness
listed.
For example, W2
– 5/8” Keys are listed as:
W2
– 5/8” Keys
for 3/4” and thicker stock
Do not use Keys which are too short as the resulting
joints will not be as strong or tight as they could be.
If correct length Keys are not available, stacking two
Keys is advised.
When using Solid Wood Dovetail Keys it is important to
remember that wood Keys are only intended to be a
decorative item. They should not be used alone as a fastener.
Due to the grain direction and possible dimensional variations
with changes in humidity the inherent strength of wood Keys
is less than that of our plastic Keys.
We strongly recommend to use a plastic Key for strength and
“cap” it with a wood Keys for looks.
Wood Keys are available in 12” lengths and are easily cut
to any length.
A fine toothed handsaw (Japanese Style) is a safe
way to cut wood Keys to length.
For larger quantities we found using a bandsaw with a
fine toothed blade is safer than any type of miter of chop saw.
Always read and follow all safety instructions that came with
your power tools!
W-2 W-3 W-4
1
2
3
