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POSITIONING DIAGRAMS OF SPURS ROTARY CUTTER BLADE IN
RELATION TO PROPELLER BLADES
Cutter Operation
CUTTER OPERATION

The leading edge of the propeller blade draws the line into the cutting blades making positioning of driven cutter blade (*) important.

DIRECTIONS:
  1. Looking aft, position edge of cutter blade slightly behind leading edge of propeller.
  2. Cutter will cut in any position; however, it becomes more efficient when positioned correctly.
  3. Positioned correctly, cutter will also be more efficient when reverse cut is made.

 
CUTTER BLADE POSITIONING with reference to the
PROPELLER BLADES
Arrows on propeller blades below point to leading edge of
propeller. VIEWED LOOKING AFT.

Example Of Wrong Cutter Blade Location
When the cutter blade is forward of propeller blade, the line will lay on top of cutter blade during this revolution of propeller. It will not be cut until next revolution

blades

5 BLADE PROPELLERS:
Position (1) cutter blade 1/4" to 1" behind the leading edge of propeller blade; the second cutter blade will fall on the leading edge; however cutting will not be affected

DRILL AND TAP SIZING CHART
Table of drill and tap selections necessary to drill and tap holes for mounting holding block to strut or stern tube.
SCREW SIZE TAP DRILL SIZE TAP SIZE
5/16 X 18 17/64 or F or I -.257 - .272 5/16 X 18
3/8 x 16 5/16 or P - .312 - .323 3/8 x 16

STEP 1:Use regular starter tap.
STEP 2: For shallow holes, use a bottoming tap to complete threads to bottom of drill hole.

ELECTROLYSIS PREVENTION AND SOUND DEADENING FOR STATIONARY CUTTER ASSEMBLY ONLY.
To prevent electrolysis, a zinc has been installed on the stationary cutter assembly and must be replaced as necessary.
(The stationary cutter is isolated.)
The driven cutter portion of the cutter assembly is clamped to the shaft and gets its electrolysis protection from shaft zinc or prop nut zinc.

Zinc Anode Installation
Use hammer; tap to set zinc, then re-tighten screw

 

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Spurs Marine Logo Marine Manufacturing Inc.
201 SW 33rd Street Ft. Lauderdale, FL 33315 USA
E-mail: spurs@spursmarine.com
phone: (954) 463-2707 Fax: (954) 525-0239
spurs cutters are protected by USA and International patents
   Spurs Marine Logo logo is a trademark of Spurs Marine Manufacturing Inc
Copyright ® All rights reserved.