Power Saws and Grinders Flashcards
What type of power saw is in the image?
A power hacksaw.
How is the speed of a power hacksaw measured?
Strokes per minute (spm).
How are power hacksaw blades different from hand hacksaw blades?
They are wider, thicker, and longer.
What are fully-hardened hacksaw blades good for?
- Long life over a wide range of materials, including stainless steel.
- They withstand heavy feed pressures for faster cutting.
How are bimetal hacksaw blades constructed?
They have a high speed steel tooth edge with a tough alloy steel back. The tough alloy back resists breakage better and handles irregular cuts.
What is blade rake angle?
Rake angle is the angle of the cutting face relative to the workpiece.
What type of power saw is in the image?
Horizontal band saw.
What are some of the advantages of a horizontal band saw?
- Continuous steel blade.
- Greater cutting efficiency.
- Variable speed drives.
When cutting a long piece of stock on a cut off saw what must be done?
Support the piece with a stand with a roller.
What should be done when cutting a short piece on a cut off saw?
Place a similar piece at the back of the jaws before clamping, otherwise the jaws tend to distort.
What is the contour band saw used for?
Shaping metal, rather than cutting lengths of stock.
What are the major sections of a contour band saw?
- The base.
- The column.
- The head.
How is capacity of contour band saws measured?
By the throat distance and the max work height.
Throat distance is the distance between the blade and the column.
Work height is the distance between the table and head.
On a contour band saw what is the work holding jaw?
It supports the work while it feeds into the blade and keeps your hands to the side of the blade.
On a contour band saw what is a power feeding table?
A chain holds the workpiece in place and a hydraulic system moves the table at a set feed rate.
On a contour band saw what is the gravity feeding attachment?
On smaller machines, the feed mechanism uses gravity with cables, pulleys, and weights or air pressure.
On a contour band saw what is the ripping fence?
A flat bar to guide the piece for rip cuts.
What are the three types of band saw blade materials?
- High carbon steel.
- Bimetal.
- Tungsten carbide.
What types of material are high carbon steel blades suited for?
Mild steel, brass, and copper.
What are some advantages of bimetal blades to high carbon steel blades?
- Greater wear resistance.
- Greater heat resistance.
- Faster cutting speeds.
- Better durability.
What are the three tooth forms found on band saw blades?
- Standard tooth.
- Hook tooth.
- Skip tooth.
What is the standard tooth blade used for?
Has evenly spaced teeth with a 0-degree rake angle.
Used for general purpose cutting of most metals.
What is the hook tooth blade used for?
Has a positive rake angle.
Has faster cutting rates and uses less feed pressure.
Good for soft metals, wood, and plastics.
What is the skip tooth blade used for?
Has a 0-degree rake but with wider teeth spacing.
The large gullet provides more chip space.
Ideal for soft materials or workpieces with a thick cross-section.
What are the three main sets of band saw blades?
- Raker set.
- Wavy set.
- Straight or alternate set.