Operating and Maintenance Manual
©
HOFFMANN MU3 & MU3-D
• Version 7.205.00 • 01-2018
24
17
Step-by-Step Instructions for 45 degree miter joints
1. Select proper Dovetail Keys for the material being joined
by always using the longest Keys possible.
For example
, for 1/2” thick material use 3/8” long Keys, for
3/4” thick material use 5/8” long Keys, for 1” thick material
use 7/8” long Keys, etc.
If correct Key size is not available, it is better to stack
multiple Keys than to use a single, short Key.
2. Set the routing height by adjusting the height adjustment
bar to the desired setting.
TIP: Hold a Dovetail Key against the bar for quick setting.
3. Select the key locations along the mitered end,
depending on the material being joining.
For profiled moulding, try to place Keys in thicker portions
for best results.
Generally, moulding over 1 1/4” (32mm) wide should be
joined with two Dovetail Keys for added strength.
4. Place workpiece on table and adjust Center Fence Plate
by moving it in or out until desired keyway location is set.
Use the Center Line Locator and/or digital display is so
equipped.
5. Lock the Center Fence Plate in place with the locking
lever and place workpiece tightly against fence plate while
pushing mitered end against back fence.
6. Slowly and consistently pull main handle down to press
workpiece on table. Continued pulling will raise router motor
up until preset height is reached.
7. Return main handle to lower motor to its home position
and remove workpiece
Note: Motor will switch on and off automatically.
