3199548
Description
Flashcards by Vincent Bergeron, updated more than 1 year ago
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Created by Vincent Bergeron
over 8 years ago
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| Question | Answer |
| List six advantages of the contour bandsaw | -Unrestricted Machining Geometry (no limitation for angles) -Holds Sharpness: wear distributed over many teeth -Less Power: minimum of material reduced to chips, narrow tooth kerf -Simple Fixturing: downward cutting action -Continuous Cutting -Least Material Waste |
| How is the blade speed adjusted on a contour bandsaw? | -variable speed handwheel |
| What supports and guides the blade to keep it from twisting? | -upper saw guide |
| Why are the following types of saw blades used? precision | -most generally used type of saw blade - 0 degree rake angle and 30 degree back clearance -used for fine finish |
| What general rule applies when selecting the pitch of a saw blade? | -The thickness of the material to be cut determines the pitch of the blade to be used. Coarse pitch = thick materials Thin materials = fine-pitch blade |
| Describe the following blade sets: Raker | -this set has one tooth offset to the right, one offset to the left, and third tooth straight. -used for most sawing application |
| Describe Wave blade sets | -has a group of teeth offset to the right and the next group to the left -used when cross-section of the workpiece changes, such as pipe |
| How can the following sawing factors be increased: tool life | -slower tool velocity (fewer teeth per minute) -Finer pitch band tool (more teeth and smaller gullets) -medium feeding rate -claw tooth (positive rake angle) |
| How can the following sawing factors be increased: accuracy | -faster too velocity (more teeth per minute) -slower feeding rate |
| Calculate the length of saw band required for the following contour bandsaws: Two 30-inch diameter pulleys with a center-to-center distance of 50 inch | Blade length = 2 (Center Distance)+ (Pulley Circumference) |
| Calculate the length of saw band required for the following contour bandsaws: Two 750-mm diameter pulleys with a center-to-center distance of 1250 mm. | Blade length = 2 (Center Distance)+ (Pulley Circumference) |
| Why are the following types of saw blades used? buttress | -this saw blade has teeth spaced farther apart to provide more chip clearance -used for thick work sections and for deep cuts in soft material |
| Why are the following types of saw blades used? claw | -has a positive rake on the cutting face -slightly less back clearance -general applications -faster cutting but not as smooth as others |
| Describe straight blade sets | -one tooth offset to the right and the next to the left -used for cutting light non-ferrous castings, thin sheet metal, tubing, and bakelite |
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