Tri Tool 404 & 424 Keymaster - Manual (Page 6)

6
TRI TOOL INC.
92-0767 : Rev. 990427
NOTE:
GENERAL DESCRIPTION
The Model 424 Keyway Cutter is designed to mill 1/4” (6.35 mm) to 1 1/4” (31.75 mm)
wide by up to 6” (152.4 mm) long keyway slots in 1 1/2” (38.1 mm) to 24” (609.6 mm)
diameter shafts.
The cutter may be used to install new keyways, re-cut keyways after being weld
repaired, or install second keyways to bypass a damaged keyway.
The tool uses a Vee block system to auto align and center the tool to the shaft, for shaft
sizes up to 4 1/2” (114.3 mm).
The tool mounts with a fixed bottom clamp bar.
For larger shaft sizes a system of spacers and chain clamps are included.
The tool incorporates a graduated depth of cut system and a mechanism to shift the
cutter off center to allow milling the sides of the keyway with a light finish cut for optimum
width precision and surface finishes.
With this system the keyway width is not dependent on the mill cutter dimensions. For
example, a 3/8” (9.5 mm) mill cutter can be used to cut up to a 5/8” (15.88 mm) wide
key slot.
Provisions are incorporated to allow use of a dial indicator for adjustments and to verify
the setting accuracy.
Axial feed is provided for by a manual ratchet system.
The Model 424 uses standard 1/2” (12.70 mm) shank mill cutters and is provided with a
collet reducer bushing to allow use of 3/8” shank mill cutters.
The KEYMASTER TM comes in a custom fitted carrying/storage case, a selection of end
mills [1/4” (6.35 mm) to 1” (25.40 mm) in 1/4” (6.35 mm) increments] and clamping
systems for 1 1/2” (38.1 mm) to 24” (609.6 mm) diameter shafts.
The standard drive motor is a variable speed 1 HP 115 Volt AC motor.
1/8” increments for End Mills are available.