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Title: Cutting frozen ground with disc saws
Authors: Mellor, Malcolm
Keywords: Cutting tools
Cutting machines
Circular saws
Frozen ground
Frozen soils
Frozen gravel
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 261.
Description: Technical Report
Abstract: The largest commercially available disc saws (7 ft diameter) were tested in frozen ground. Cutting performance was reasonably attractive, specific energy consumption was acceptable, but cutter durability in frozen gravel was judged to be totally inadequate. A new cutter system was developed for the saw that provided best general capabilities, and a dramatic improvement in cutter durability was achieved (wear rate and cutter cost dropped by a factor greater than 10 and possibly by a factor of 100). The modified saw cut slots 3.7 in. wide and 30 to 34 in. deep at rates up to 6.6 ft/min in coarse frozen gravel and up to 16.3 ft/min in frozen silt. Overall values of specific energy for sawing (based on gross machine power) were 4.7 x 10^3 lbf/in.^2 for gravel and 1.8 x 10^3 lbf/in.^2 for silt. Effective specific energy for bulk excavation using the kerf-and-rib technique was projected to be lower than these values by a factor of 5, taking a depth/width ratio for the uncut ribs of 2. Axle forces on the cutter wheel depend on the design of the cutting teeth and on the state of wear. For the test machine, horizontal cutting resistance with well-worn teeth could exceed the tractive capability of the carrier vehicle on some types of running surfaces. All essential data needed to design disc-saw attachments for crawler tractors are now available.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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