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14 records – page 1 of 2.

Development and mill trials of an active guide system for bandsaws (final report)

https://library.fpinnovations.ca/en/permalink/fpipub37418
Author
Taylor, J.
White, J.
Date
October 1996
Material Type
Research report
Field
Wood Manufacturing & Digitalization
and the sawblade deviation, the reduction in cutting bias being accompanied by a similar reduction in sawing
Author
Taylor, J.
White, J.
Date
October 1996
Material Type
Research report
Physical Description
19 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Stresses
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Series Number
W-1330
Location
Vancouver, British Columbia
Language
English
Abstract
Research into the cutting characteristics of bandsaws has shown that the average cutting path of the sawblade is biased to one side of the ideal cut path. It has also been shown that a strong correlation exists between this cutting bias and sawblade deviation. This report is the second on the topic of bandsaw cutting bias and describes the development and mill trials of a PC based, self aligning bandsaw guide system. This system uses data from the sawblade, and programmable logic controllers controlling the bandmill, to monitor bandsaw cutting behaviour and align the guides to minimize the cutting bias and sawblade deviation. The system is shown to effectively reduce sawblade deviation and unscheduled blade changes and compensate for damaged or poorly prepared blades.
Saws - Band
Sawing - Blades
Cutting - Stresses
Documents
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Dynamic behaviour of saws and sawing systems : cutting characteristics of bandsaws

https://library.fpinnovations.ca/en/permalink/fpipub37194
Author
Taylor, J.
Hutton, S.G.
Date
March 1987
Material Type
Research report
Field
Wood Manufacturing & Digitalization
AND SAWING SYSTEMS: CUTTING CHARACTERISTICS OF BANDSAWS by J. Taylor S.G. Hutton Research Scientist
Author
Taylor, J.
Hutton, S.G.
Date
March 1987
Material Type
Research report
Physical Description
35 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Stresses
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Series Number
CFS No. 42;02-12-15-022
W-491
Location
Vancouver, British Columbia
Language
English
Abstract
Saws - Band
Sawing - Blades
Cutting - Stresses
Documents
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Effect of bandsaw stresses on blade stiffness and cutting accuracy (thesis format)

https://library.fpinnovations.ca/en/permalink/fpipub37321
Author
Taylor, J.
Date
March 1993
Material Type
Research report
Field
Wood Manufacturing & Digitalization
, breaking l a r g e logs i n t o manageable pi e c e s (cants) f o r the other sawing centres i n the m i
Author
Taylor, J.
Date
March 1993
Material Type
Research report
Physical Description
151p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Series Number
Forestry Canada No. 52A
Contract no. 1212K032
W-1046
Location
Vancouver, British Columbia
Language
English
Abstract
The effect of bandsaw roll-tensioning and bandmill axial forces on the stresses in the blade, on the interaction of the blade with the bandmill and on the stiffness and cutting accuracy of the sawblade are examined. The stresses due to roll-tensioning are measured and their effect on frequency and stiffness determined. The effect of the blade-wheel geometry on the stresses in the cutting region are analyzed showing how the stresses, frequency and stiffness of the sawblade relate to its cutting accuracy. Empirical relationships are developed that enable the stresses due to roll-tensioning to be estimated. Analytical methods accurately predict the effect of roll-tensioning on blade torsional frequency and lateral stiffness. A model was developed that successfully predicts the effect of overhang on the stress in cutting region of the blade. Both analytical and experimental results confirm that rolling in the centre 60% of the sawblade will increase blade stiffness while rolling outside this region will reduce it. Cutting accuracy is shown to be strongly related to lateral tooth stiffness, and it is also shown that optimum increases in stiffness and improved cutting accuracy are obtained by confining the roll-tensioning to be close to the blade centre-line.
Saws - Band
Sawing - Blades
Documents
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The effect of different amounts of roll-tensioning on the cutting accuracy of bandsaws

https://library.fpinnovations.ca/en/permalink/fpipub5536
Author
Taylor, J.
White, J.
Bouchard, A.
Date
September 1997
Edition
37463
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Cutting Accuracy of Blade 5 Compared to Mill Standard Figure 9 Total Sawing Deviation by Degree
Author
Taylor, J.
White, J.
Bouchard, A.
Date
September 1997
Edition
37463
Material Type
Research report
Physical Description
11 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Series Number
W-1468
Location
Vancouver, British Columbia
Language
English
Abstract
Across North America the amount of tensioning used in bandsaws varies drastically. Sawblades tensioned to fit circle gauges from 28 feet to 80 feet in diameter are in regular use and performing very well. This raises the questions as to what is the right amount of tension and what effect does it have on cutting accuracy. In this study, the cutting accuracy of five sawblades, with varying levels of tension, have been measured and compared. The results show that little change occurs in cutting accuracy once enough tension has been put into the blade for it to fit an 80-ft circle gauge.
Saws - Band
Saws - Maintenance
Sawing - Blades
Documents
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The effect of increasing bandmill speed on vibration and cutting accuracy. Part 1. Laboratory experiments. (Final report).

https://library.fpinnovations.ca/en/permalink/fpipub37351
Author
Taylor, J.
White, J.
Date
February 1994
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Taylor, J.
White, J.
Contributor
Science Council of British Columbia.
Date
February 1994
Material Type
Research report
Physical Description
66 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Band saws
Saw bands
Saws
Bands
Saw mills
Equipment
Sawing
Series Number
W-1134
Location
Vancouver, British Columbia
Language
English
Abstract
This paper investigates the feasibility of increasing bandmill production by proportionally increasing both blade speed and lumber feed speed. A modal analysis of the bandmill and bandsaw was conducted and resonant conditions, likely to impair performance, were identified. Cutting tests were conducted to determine the effect of increased blade speed on cutting accuracy, surface finish and sawdust quality. The tests were conducted at blade speeds of 10,000 fpm, 12,500 fpm and 15,000 fpm and examined the effect of tipped and swaged blades cutting Coastal Hem/Fir and Interior SPF.
Saws - Band
Sawmills - Equipment
Sawing - Cutting speeds
Documents
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The effect of increasing bandmill speed on vibration and cutting accuracy. Part 2. Mill trials. (Final Report)

https://library.fpinnovations.ca/en/permalink/fpipub37376
Author
Taylor, J.
White, J.
Date
March 1995
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Taylor, J.
White, J.
Contributor
Science Council of British Columbia.
Date
March 1995
Material Type
Research report
Physical Description
37 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Band saws
Saw bands
Saws
Bands
Saw mills
Equipment
Sawing
Series Number
W-1200
Location
Vancouver, British Columbia
Language
English
Abstract
The global objective of the project is to investigate the feasibility of increasing bandmill production by proportionately increasing both the blade speed and the lumber feed speed. The objective of this phase of the project is to transfer the results of the laboratory experiments to the sawmill industry. The work described in this report covers the transfer of the technology to two sawmills. The first report has a more detailed introduction to the project and a review of the literature.
Saws - Band
Sawmills - Equipment
Sawing - Cutting speeds
Documents
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Exploratory tests for reducing fiber tear in bandsawing unseasoned western red cedar

https://library.fpinnovations.ca/en/permalink/fpipub37396
Author
Kirbach, E.
Date
February 1996
Material Type
Research report
Field
Wood Manufacturing & Digitalization
. Further studies are needed to accurately determine the benefits of inclined feeding or sawing directions
Author
Kirbach, E.
Date
February 1996
Material Type
Research report
Physical Description
12 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Thuja plicata
Stresses
Band saws
Saw bands
Saws
Bands
Sawing
Series Number
W-1275
Location
Vancouver, British Columbia
Language
English
Abstract
A significant percentage of rough-cut unseasoned cedar products are down-graded due to excessive roughness caused by fiber pulling. An exploratory study was carried out to reduce or eliminate this problem. It was found that inclining the feed direction in relation to the saw movement significantly reduces degrees of fiber pulling, indicating that the problem of down-grading due to fiber pulling may be at least partly solved. Boards that show no or insignificant fiber pulling did not change their surface roughness due to the fact that the roughness on the boards is solely the function of bite per tooth. Nevertheless, this type of board always makes the grade and therefore is not a problem. Further studies are needed to accurately determine the benefits of inclined feeding or sawing directions.
Saws - Band
Cutting - Stresses
Cutting - Thuja plicata
Sawing - Thuja plicata
Documents
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Improving bandsaw performance : effect of side grinding swaged bandsaws on cutting accuracy and surface finish

https://library.fpinnovations.ca/en/permalink/fpipub5567
Author
Wang, A.
Taylor, J.
Szathmary, G.
Date
December 2001
Edition
37598
Material Type
Research report
Field
Wood Manufacturing & Digitalization
-gauge bandsaws respectively improved sawing accuracy up to 22% and 44%, reduced sawblade lateral
Author
Wang, A.
Taylor, J.
Szathmary, G.
Date
December 2001
Edition
37598
Material Type
Research report
Physical Description
13 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Series Number
1996
W-1817
Location
Vancouver, British Columbia
Language
English
Abstract
The primary objective of the study is to measure the effect on cutting accuracy of side grinding swaged tooth bandsaws. The effect of side grinding on surface finish is included for comparison with previous work. Swaged tooth bandsaws tend to leave quite a rough sawn surface. Cutting with large bites or uneven teeth aggravates this problem. Previous studies have shown that side grinding could improve surface finish but it was not shown to have any effect on cutting accuracy. However, sawmills and saw manufacturers have indicated that side grinding can improve cutting accuracy. Therefore, this contradiction needs to be resolved in order to quantify any benefits from side grinding. The results indicate significant improvements in cutting accuracy and surface finish are possible. Side grinding 17-gauge and 16-gauge bandsaws respectively improved sawing accuracy up to 22% and 44%, reduced sawblade lateral displacement up to 36% and 68% and improved the sawn surface finish up to 24% and 11%. Extremely careful bandsaw fitting and tooth alignment was necessary in the preparation of side ground saws. This cost-time-effectiveness has to be considered when adding side grinding to swaged saw preparation.
Saws - Band
Saws - Maintenance
Sawing - Blades
Documents
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Off-centre cutting in bandsaws

https://library.fpinnovations.ca/en/permalink/fpipub37392
Author
Taylor, J.
White, J.
Date
December 1995
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Taylor, J.
White, J.
Date
December 1995
Material Type
Research report
Physical Description
17 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Stresses
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Series Number
W-1260
Location
Vancouver, British Columbia
Language
English
Abstract
Research into the cutting characteristics of bandsaws has shown that, in nearly every case studied, the average cutting path of the saw is biased to one side of the ideal cut path. This paper presents the results of a laboratory investigation into this off-centre cutting. The influences on the shape and cutting behaviour of bandsaws of such basic factors as bandmill strain, guides, guide alignment, and blade overhang, are measured. It is concluded that bandsaw blades are curved in the cutting region and angled slightly out of the cut. The curvature and angle of the blade are due to the interaction of the bandsaw with the bandmill wheels, in the presence of bandmill strain, overhang and wheel crown, and are relatively insensitive to bandmill strain or pressure guides. The curvature and angle of the blade in the cutting region are most likely the cause of the cutting bias.
Saws - Band
Sawing - Blades
Cutting - Stresses
Documents
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Results from a test of bevelled tooth bandsaw blades

https://library.fpinnovations.ca/en/permalink/fpipub5515
Author
Lister, P.F.
Sykes, D.
Date
October 1995
Edition
37390
Material Type
Research report
Field
Wood Manufacturing & Digitalization
° alternate top bevel (ATB) tootii for handsaws. The test involved comparing the sawing variation and surface
Author
Lister, P.F.
Sykes, D.
Date
October 1995
Edition
37390
Material Type
Research report
Physical Description
8 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Saw tooth
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Design
Series Number
W-1256
Location
Vancouver, British Columbia
Language
English
Abstract
This report describes the results of a mill test investigating the effect of a 15 degree alternate top bevel (ATB) tooth for bandsaws. The test involved comparing the sawing variation and surface roughness of Douglas-fir lumber cut by both ATB and standard saws. The test results showed no improvement in sawing accuracy with the ATB blades. In fact, as the blades became dull, the sawing accuracy of the ATB saws deteriorated faster than for the standard blades. Visual evaluation of surface roughness also indicated that the ATB saws produce slightly rougher lumber. However, this may be due to increased tooth bite associated with the ATB teeth. Further testing will be required to determine if the results of this test are truly representative of the performance of ATB bandsaws in general.
Saws - Band
Sawing - Blades
Saws - Tooth design
Documents
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14 records – page 1 of 2.