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Construction Safety
Published in W. David Yates, Safety Professional’s Reference and Study Guide, 2020
In the construction industry, probably the most commonly used power tool is the portable circular saw. Unfortunately, it is also one of the most commonly abused tools. Familiarity with its use can cause carelessness on the part of the user. The following are specific safety practices that must be followed when using portable circular saws: Always use the appropriate PPE, including safety glasses or goggles with side shields that comply with the current standard. In addition to safety glasses or goggles, a face shield is highly recommended. The use of hearing protection is also required;Do not wear loose clothing, jewelry, or dangling objects, including long hair, which may catch on rotating parts or accessories;Do not use a circular saw that is too heavy for you to easily control;Be sure that the switch actuates properly and never tape the switch or “trigger” down on any power tool;Use sharp blades. Dull blades can cause binding, stalling, or kickback;Use the correct blade for the application;Always inspect the portable circular saw prior to use to ensure that all safety features provided by the manufacturer are installed, including the blade guard. Be sure to inspect the power cord and ensure that it is connected in the proper order to a GFCI;For maximum control of the circular saw, be sure to operate it with both hands;Avoid cutting small pieces that cannot be properly secured and material on which the saw cannot rest;ALWAYS ensure that the surface you are cutting on is stable. NEVER hold or balance a piece of material in one hand while trying to operate the circular saw with the other.
Construction Safety
Published in W. David Yates, Safety Professional’s, 2015
In the construction industry, probably the most commonly used power tool is the portable circular saw. Unfortunately, it is also one of the most commonly abused tools. Familiarity with its use can cause carelessness on the part of the user. The following are specific safety practices that must be followed when using portable circular saws: Always use the appropriate personal protective equipment including safety glasses or goggles with side shields that comply with the current standard. In addition to safety glasses or goggles, a face shield is highly recommended. The use of hearing protection is also required.Do not wear loose clothing, jewelry, or dangling objects, including long hair, which may catch on rotating parts or accessories.Do not use a circular saw that is too heavy for you to easily control.Be sure that the switch actuates properly and never tape the switch or “trigger” down on any power tool.Use sharp blades. Dull blades can cause binding, stalling, or kickback.Use the correct blade for the application.Always inspect the portable circular saw prior to use to ensure that all safety features provided by the manufacturer are installed, including the blade guard. Be sure to inspect the power cord and ensure that it is connected in proper order to a GFCI.For maximum control of the circular saw, be sure to operate it with both hands.Avoid cutting small pieces that cannot be properly secured and material on which the saw cannot rest.ALWAYS ensure that the surface you are cutting on is stable. NEVER hold or balance a piece of material in one hand, while trying to operate the circular saw with the other.
Evaluation of mechanical cutting for disassembly of fast reactor fuel assemblies
Published in Journal of Nuclear Science and Technology, 2023
Hidetsugu Nishikawa, Masayuki Takeuchi, Toru Kitagaki, Akinori Inoue, Isamu Sato
Figure 5 shows optical microphotographs of cutting powder generated by cutting SUS316 with different CWs. The cutting powder generated by the CW with the CBN outer blade and the CubitronTM CW differed from the chip-shaped particles of cutting powder generated using the metal saw. Also, the cutting powder generated by the CubitronTM CW had almost a same particle size than the CBN CW. Table 2 summarizes the results of the CW selection tests. The outer diameter of the CubitronTM CW was greatly reduced by wear, and the CubitronTM CW could not control the cutting point more accurately than the CBN CW or the metal saw. In the evaluation of wear, sparking occurrence and cutting powder generation, the CBN CW and the metal saw had equivalent performance, but for the metal saw, the vibration caused by intermittent cutting of the circular saw blade was observed. Therefore, the CBN CW was selected because using the metal saw might affect structural design of the disassembly machine. Table 3 lists specifications of the selected CBN CW. The abrasive grains are cubic boron nitride with a hardness next to that of diamond, and CBN is suitable for cutting stainless steel which is a difficult-to-cut material. The 2 to 5 mm width CBN abrasive grain layer with 2 mm thickness is bonded to the outer periphery of the metal base material.
The productivity and cost of harvesting whole trees from early thinnings with a felling head designed for continuous cutting and accumulation
Published in International Journal of Forest Engineering, 2023
In Sweden, there has been an extensive effort to develop methodology and technology for the devices that can continuously cut and accumulate trees during linear crane movement in early thinnings (Bergström 2009, 2017; Bergström et al. 2012, 2022; Bergström and Di Fulvio 2014; Grönlund et al. 2015). As a result of the development work, harvester mounted accumulating felling-head, Bracke C16 (www.brackeforest.com), exist within the market (Bergström and Di Fulvio 2014; Bergstöm et al. 2022). In addition, Bracke MAMA and Flowcut accumulating felling heads are at the prototype phase (Bergström and Di Fulvio 2014; Grönlund et al. 2021a, 2021b). Bracke accumulating felling heads cut trees using a 1.9 cm (¾ inch) saw chain, which is fitted to a circular disc (Bergström and Di Fulvio 2014). The Flowcut head cuts trees with a circular saw blade (Grönlund et al. 2021a) or using a 1.9 cm (¾ inch) saw chain fitted to a saw bar that is fixed at both ends (2021b).
Productivity and cost of harvesting overgrowth brushwood from roadsides and field edges
Published in International Journal of Forest Engineering, 2021
Felling-bunching productivity figures were relatively high compared to the current Nordic harvesting technology in short-rotation forestry (Jylhä and Bergström 2016) or harvesting power line corridors for energy (Fernandez-Lacruz et al. 2013). In a naturally afforested dense downy birch-dominated stand (Jylhä and Bergström 2016), the productivity of whole tree cutting with an average tree volume of approximately 6–56 dm3 was 12–23 m3 per PMh. In the study by Fernandez-Lacruz et al. (2013), the average whole tree volume ranged between 1.4 and 5.3 dm3, and the productivity was 2.6–6.0 m3 per PMh. In both studies, clear cutting was done with a medium-sized harvester, equipped with an accumulating felling head fitted with a circular saw disk. The width of the work path was an average of 20 or 10 m, considerably wider than in this study.