9 Drill Press Assignment
| Material | Average Drill Speed (sfm)* |
|---|---|
| Magnesium | 300 |
| Aluminum | 250 |
| Brass/Bronze | 200 |
| Copper | 70 |
| Cast Iron (soft) | 120 |
| Cast Iron (hard) | 80 |
| Mild Steel | 110 |
| Cast Steel | 50 |
| Alloy Steels (hard) | 60 |
| Tool Steel | 60 |
| Stainless Steel | 30 |
| Titanium | 30 |
| High Manganese Steel | 15 |
*Note: for carbide drills, double the average speeds
*Surface feet per minute, aka SFM = 0.2618 x (drill diameter in inches) x (rotations per minute, aka RPM)
Purpose
- Work as a team, dividing up large tasks into smaller ones
- Use technical resources to access information regarding welding and fabrication processes
- Identify and use common types of shop equipment and hand tools to safely perform welding/fabrication procedures
- Follow industry standard safe practices, including the using and wearing of all safety equipment needed to weld or be in a welding environment
- Use math to make equipment adjustments/calibrations and to complete fabrication projects
- Prepare a work area to do layout and fabrication
- Select and safely set up layout and fabrication projects
- Prepare metal for layout and fabrication projects
- Use proper welding tools and equipment to complete layout and fabrication projects
- Become familiar with a drill press, drill speed, and drill pressure
Task
In this assignment, you and your team will be making a total of one (1) six-sized dice and one (1) Swiss cube.
Remember to record all measurements and calculations!
- Find usable material for this assignment BEFORE you start this assignment.
- Create an orthographic drawing in AutoCAD of a Swiss cube.
- Create a print in AutoCAD of a six-sided dice.
- Calculate drill speed for each size drill press. Note: SFM (surface feet per minute) is the relative speed between the spinning cutting tool and the workpiece. For different materials, the speed has to be faster or slower to prevent the bit from getting too hot and burning up the drill. With harder materials, spin slower. With softer materials, spin faster. Do the math every time you change the SIZE of the drill bit and every time you are drilling into a different MATERIAL. The math must include the diameter of the drill.
- Cut the cubes to size.
- Measure and mark hole locations.
- Use a center punch to guide the drill bit.
- Properly operate the drill press and its features, including using cutting oil.
Criteria of Success
Swiss Cube
- Outer edges must be beveled.
- Edges cannot have sharp edges or burrs.
- Holes cannot overlap or break through to each other.
- The corners need to have 90° angles [5° tolerance].
- All sides of the cube need to be equal in dimension [1/8″ tolerance].
Six-Sided Dice
- Outer edges must be beveled.
- Edges cannot have sharp edges or burrs.
- Holes must be equal depth and cannot overlap.
- The corners need to have 90° angles [5° tolerance].
- All sides of the cube need to be equal in dimension [1/8″ tolerance].
