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 Line Cutters (propeller Mounted) for propeller hub sizes 9" to 72" inches (200MM to 1800MM)

Propeller Mounted
What Are Spurs?
Typical Installation
Oil Leak Responsibility
Propeller Mounted
Thrusters and Pods
How Spurs Work?
Installation
typical cutter models
How to Install?
Installation Drawings
How To Order
Interactive Assembly

 

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Spurs use the propeller's rotation and inertial force to power the cutting action.
NOTES: Remove rope guard. Flame blow & grind all old weld debris from the welded area where the rope guard will be remounted.

Instruction 1 A. Position Cutter Drill Template on propeller face with cutter blade behind the leading edge of the propeller blade. (see 1)
B. Note: All rotating cutters must be equal distance from center! Use template centering arm to locate cutter from shaft to upper edge of prop face, then lock screws on centering arm slide. Use marking pencil or scribe to draw outline of template on propeller face. (see 1)
Repeat above procedure for opposite propeller blade. Do not alter centering arm once positioned in place. Move template 180° from first layout for four-blade propellers, (144° for five blade propellers). (see 3 & 4)
Instruction 2 C. Holding template in place, drill through bottom center hole first, using 3/8" spotting drill (provided) approximately 1/8" deep. Then use "P" size drill to complete hole 1" deep. Then tap with 3/8" x 16 tap approximately 3/4" deep. (see 2 & 3)
Use 3/8" x 1 3/4" SHCS in bottom hole. Mount template. Now repeat procedure for drilling & tapping the other four holes. Remove template and repeat procedures on opposite rotating blade location with template. (see 3)
Instruction 3 D. Before mounting the rotary cutter blades, qualify two or more surfaces under the cutter mount location: these surfaces MUST be within the same axial plane within .005 in. (see 4)
E. IMPORTANT: The cutter mounting holes must be drilled, but do not mount rotary cutter blades onto propeller until propeller is on the shaft and in place. (see 5)
Instruction 4 F. With propellers completely mounted, rotate propeller until one set of drilled holes are 45° degrees from top center on "up" (preferred), or "down" side. (see 3 & 5)
Instruction 5 G. Mount rotary cutter blades to prop face ("Leader" rotary cutter blade on top, "Follower" on opposite side). (see 5)
NOTE: The rotary cutter blades are each marked as "LEADER" or "FOLLOWER" ROTARY BLADE. The "LEADER" has a groove which is .015 smaller than the "FOLLOWER" blade. This groove spacing allows for possible axial misalignment of prop face.
Instruction 6 H. Marry the stationary cutter assembly to the mounted rotary cutter ("Leader"). There are two 3/8" x 1 3/4" shoulder screws and nuts for this purpose. (NOTE: two shims must be between rotary and stationary blades when marrying the two assemblies). (see 6)
Instruction 7 I. Using plastic transfer paper, or measuring tape, mark from top center line on propeller to upper edge of cutter box. Transfer this measurement to rope guard. Then, using marking pencil, and Spurs' thin aluminum cutout template (provided), transfer cutout onto upper section of rope guard. The rope guard cutout should clear the stationary cutter box by approximately .125" - .025" on all three sides. (see 6, 7 & 8)
Instruction 4 Ia. The Stationary Cutter assembly Rope Guard cut-out should be located at approximately 10:30 looking forward on a right-hand turning propeller and 2:30 on a left-hand turning propeller. Only ONE Rope Guard cut-out for each propeller!


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