Engineering Info on Harvester Cutting Attachments

Harvester Working


Technical Data In Metric Units

The following information is provided courtesy of OREGON® Cutting Systems. It relates information critical to success of saw chain-based cutting systems in mechanized wood harvesting and processing equipment. In offering this information, we do not assume any responsibility for the design or manufacture of machines, or for the content of literature supplied by machine manufacturers. The purpose of this information is to communicate important information to designers, manufacturers, sellers, and users of wood-harvesting and processing machinery.

Chain Size .404" Pitch 3/4" Pitch
OREGON® Chain Number #16H #18H #11BC #11H
Physical Properties
Weight, kg/m. .327 .369 .949 .937
Tensile Strength, N 11500 12000 30000 30000
Kerf, mm 8.6 8.9 14 15
Gauge, mm 1.6 2.0 3.1 3.1
Actual Pitch, mm 10.3 10.3 19.9 19.9
Bar Thickness, mm min/max 5.7/6.0 6.0/6.4 9.0/10.4 9.0/10.4
Sprocket Thickness, mm 12 12 N/A N/A
Operating Parameters
Bar/Chain Oil cc per minute 30 30 40 40
Bar/Chain Oil cc per stroke 8 8 10 10
Power, kW min/max 7/35 7/35 4/40 4/40
Force on Bar to Tension Chain, N 490 490 668 668
Bar Feed Load, at Center, N, min/max 220/310 220/310 130/445 130/445
Bar Feed Load, at Center, N, recom 270 270 335 335
Chain Speed, m/sec, min/max 15/40 15/40 8/35 8/35
Chain Speed, m/sec recommended 40 40 30 30
Min. Bar Adjust, cm/cm of bar length 0.015 0.015 0.019 0.019

Technical Data In English Units

Chain Size .404" Pitch 3/4" Pitch
OREGON® Chain Number #16H #18H #11BC #11H
Physical Properties
Weight, lbs/ft. 0.220 0.248 0.638 .0.630
Tensile Strength, lbs. 2600 2700 6700 6700
Kerf, in. 0.34 0.35 0.57 0.57
Gauge, in. 0.063 0.080 0.122 0.122
Actual Pitch, in. 0.4055 0.4055 0.7835 0.7835
Bar Thickness, in. min/max .225/.237 .238/.252 .355/.41 .355/.41
Sprocket Thickness, in. 0.46 0.46 N/A N/A
Operating Parameters
Bar/Chain Oil cubic inches per minute 2 2 2.5 2.5
Bar/Chain Oil cubic inches per stroke 0.5 0.5 0.6 0.6
Power, hp min/max 10/50 10/50 5/55 5/55
Force on Bar to Tension Chain, lbs. 110 110 150 150
Bar Feed Load, at Center, lbs., min/max 50/70 50/70 30/100 30/100
Bar Feed Load, at Center, lbs., recom 60 60 80 80
Chain Speed, ft/min., min/max 3000/8000 3000/8000 1500/7000 1500/7000
Chain Speed, ft/min. recommended 8000 8000 6000 6000
Min. Bar Adjust, in/in of bar length 0.015 0.015 0.019 0.019

These guidelines are intended to provide a balance between performance and service life. If these guidelines are exceeded, operators must be aware that excessive chain speed or feed force: reduces service life and increases wear, requires extra lubrication and attention to tensioning and sharpening,and  increases the incidence of chain breakage and the risk of injury.

The  information above is provided courtesy of OREGON® Systems Division of Blount, Inc., from their Mechanical Timber Harvesting Handbook. We urge you to contact OREGON® customer service at (503) 653-8881 for explanation or clarification of information you are unsure of or do not understand. 

Would you like a copy of the OREGON® Mechanical Timber Harvesting Handbook? Next time you place an order, just ask. We'd be happy to include a FREE copy in your package. This document is filled with valuable information for harvester cutting attachments of all sizes.