Shaft mounted SPURS Cutters systemAs gemonteerd SPURS Cutters systemen

Shaft mounted SPURS Cutters system

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The principle that enables the shaft mounted “SPURS” to cut so effectively is the “screw action” created as the propeller turns, winding lines, nets or weeds directly into “SPURS” blades, for an instant cut, eliminating entanglement and damage to the running gear.

Use this tool to calculate what kind of equipment you need:

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Product Description

We offer shaft mounted cutter systems SPURS.

Major features :

  • Cuts lines, weeds, and nets.
  • Eliminates dives to cut prop-fouling lines in freezing or high seas.
  • No more costly commercial “down time” for repairs.
  • Prevents the need for Coast Guard towing or expensive commercial towing.
  • No more shafts or struts torn loose that can sink your vessel.
  • Avoid expensive haul-outs, dry-docking, and diver’s charges.
  • Prevent burnt bearings and engine overload repairs.
  • Cuts line with each revolution (forward or reverse), with no loss of speed or efficiency.
  • Fits shaft sizes 3/4″ to 7″. (Metric sizes 20mm-175mm)
  • Made of hardened stainless steel.
  • Don’t leave the dock without “SPURS” protection

Why SPURS:

PROVEN: SPURS® has manufactured line and net cutter systems for well over 30 years and has now completed over 500 ship cutter system installations worldwide.

Razor-sharp: Cutter Blade Systems are made of hardened stainless steel (17-4). Each cutter blade has (3) heat treatments to bring the blade hardness to 46 on the Rockwell scale and provide stability under saltwater.

SELECTION SPURS ROPE CUTTER SHAFT MOUNTED TYPE & HOLDING BLOCK

 

1)    Determine the following dimensions:

description and properties of shaft mounted SPURS line-cutting system part 1

APropeller shaft diameter
BPropeller hub diameter
CSpace between propeller & stern bearingsStarboard
Port
DStern tube / Strut Hub diameter
EIf tapered, length of exposed shaft taper forward of propeller faceStarboard
Port

 

2)    The cutter model can be selected from the below overview; for further assistance to select to most suitable model for your application, do not hesitate to contact us.

MODEL
TYPE
PROPELLER SHAFT DIAMETERCUTTER HUB
DIAMETER
CUTTER OVERALL LENGTHCUTTER WIDTHMINIMUM SPACE TO INSTALL CUTTERS
A3/4″, 7/8″, 1″, 1-1/8, 1-1/4″
20, 22, 25, 30mm
2 ”
51mm
4″
102mm
15/16″
24mm
1-1/8″
30mm
B3/4″, 1″, 1-1/8″,1-1/4″, 1-3/8″, 1-1/2″
25, 30, 35, 40mm
2-5/8″
67mm
5″
123mm
1-1/16″
27mm
1-1/4″
32mm
C   1-1/2″, 1-5/8″, 1-3/4″, 1-7/8″, 2″
40, 45, 50mm
3-3/8″
86mm
6″
152mm
1-3/8″
35mm
1-9/16″
39mm
D1-1/2″, 1-3/4″, 2″, 2-1/4″, 2-1/2″
40 to 60mm
3-7/8″
98mm
 6-3/4″  171mm1-7/16″  36mm  1-5/8″ 41mm
E2″, 2-1/4″, 2-1/2″, 2-3/4″, 3″
50 to 75mm
 4-3/8″  110mm 7-5/8″ 194mm1-1/2″ 37mm 1-11/16″  43mm
F2″, 2-1/4″, 2-1/2″, 2-3/4″, 3″, 3-1/2″
60 to 90mm
5-1/2″
140mm
 10″
254mm
1-9/16″ 40mm 1-3/4″ 45mm
F13″, 3-1/2″, 4″, 4-1/2″
75 to 115mm
 6-1/2″
165mm
11″
280mm
1-11/16″ 43mm1-7/8″  48mm
F23″, 3-1/2″, 4″, 4-1/2″, 5″, 5-1/2″
75 to 140mm
7-7/8″
200mm
13-1/2″ 343mm1-11/16″  43mm1-7/8″ 48mm
F34″, 4-1/2″, 5″, 5-1/2″, 6″, 6-1/2″
100 to 175mm
 9-1/2″
241mm
15-3/4″
400mm
1-7/8″
48mm
 2-1/8″
54mm

 

3)    With the selected model, also the overall cutter length is known, so the distance measured over the cutter blades’ tips.

 

4)    Subtract the vessel’s strut outside diameter (D) from overall cutter

length, then divide the outcome by 2 to get the holding block height.

 

Formula to determine holding block:
Cutter overall length              _______
Subtract strut diameter (D)   _______ –

Divide (÷) by 2                         _______ /2

Holding block height =           _______

description and properties of shaft mounted SPURS line-cutting system part 2

 

5)    Using height figure, select holding block (mounted on strut or stern tube) from the overview below.

shaft-3

WEDGE HOLDING BLOCK SIZES AVAILABLE
MOLD TYPEHEIGHTCLEARANCE HEIGHT WIDTHLENGTH
#AA.900″

22,9 mm

1/8″

3,2 mm

1 1/4″

31,8 mm

3″

76,2 mm

#11 1/8″

28,6 mm

5/16″

7,9 mm

1 3/8″

34,9 mm

3 1/4″

82,6 mm

#21 1/4″

31,8 mm

1/2″

12,7 mm

1 5/8″

41,3 mm

3 1/2″

88,9 mm

#31 ½”

38,1 mm

1/2″

12,7 mm

1 3/4″

44,5 mm

3 5/8″

92,1 mm

#3A2″

50,8 mm

7/8″

22,2 mm

1 3/4″

44,5 mm

3 11/16″

93,7 mm

#42 1/8″

54 mm

9/16″

14,3 mm

2 1/4″

57,2 mm

4 5/8″

117,5 mm

#52 1/2″

63,5 mm

3/4″

19,1 mm

2 3/4″

69,9 mm

5 1/2″

139,7 mm

#5A3 1/8″

79,4 mm

3/4″

19,1 mm

2 3/4″

69,9 mm

5 1/2″

139,7 mm

 

The above are actual diagrams of the wedge holding blocks that are available.
In most cases, they are interchangeable with cutters of different model types.
They are selected for the best height match to secure the wedge portion of the stationary cutter.

SHIMS
Shims are available to raise the holding block to attain
a height fit (when needed).

description and properties of shaft mounted SPURS line-cutting system part 4

In case of any questions or remarks, or you would like to get our advise with selecting the right components, do not hesitate to contact us via info@ambtmanmarine.com or +31 (0)88 26 28 600.

Other products

We supply variety of propulsion equipment as stand alone parts and as a part of a system designed for your vessel: propellers, propeller shafts, PSS shaft sealsnozzles , rudders, steering systems.

To protect propulsion system of your ship from entanglement we offer SPURS rope cutters: propeller and shaft mounted.

To assist steering of your ship we deliver thrusters: channel thrusters, rotatable steering grid thrusters, tunnel thrusters.