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 durablity was acheved (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 4.7X1000 lbf/in. 100 for gravel and 1.8X1000 lbf/in. 100 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 withwell-worn teeth could exceed the tractive capability of the carrier vehicle of some types of running surfaces. All essential data needed to design disc-saw attachments for crawler tractors are now available.

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 69 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00098554
  • Record Type: Publication
  • ISBN: Task 03
  • Report/Paper Numbers: Technical Rept. 261
  • Files: TRIS
  • Created Date: Aug 27 1975 12:00AM