# Sheetmetal II

SKMT 172

## Course Description

Prerequisite: SKMT 171. Continuation of Sheetmetal I. Projects involve fabrication of complex pieces to actual specification using tools common to the trade. (45)

## Outcomes and Objectives

### Identify fittings that require parallel line development.

#### Objectives:

• Identify such fittings as round tees, round elbows, and round offsets.

### Develop patterns for common fittings, such as: tees, elbows, offsets.

#### Objectives:

• Calculate circumference of a circle.
• Divide a given line into a number of equal parts.
• Divide a semi-circle into a number of equal parts.
• Measure and draw accurately + 1/32".

### Fabricate common fittings, such as: tees, elbows, offsets so that they meet the given specifications for the use of the fitting, ie (proper angle, diameter, length, and how parts fit together).

#### Objectives:

• Demonstrate the proper use of hand tools to cut out and form parts needed for the fitting, ie (scratch awl, tin snips, aviation snips, hand seamers, hand benders).
• Demonstrate the proper set up and use of bench and floor machines to form parts for a fitting. The machines would include: bar fold, bench stakes, rotary bench machines, box and pan brake, rolls, spot welder, Pittsburg machine.

### Identify fittings that require triangulation development.

#### Objectives:

• Identify the method of forming the metal for a given fitting to determine triangulation development. The fitting can be formed by rolling and/or braking and the lines used to develop the patterns form triangles.

### Develop patterns for fittings, such as: rectangle to round offset, round tapes, rectangle-to-round pitch at the top, 3 pc. rectangle-to-round elbow.

#### Objectives:

• Calculate the circumference of a circle.
• Divide a semi-circle into equal parts.
• Determine true length lines to develop patterns using right triangles.

### Fabricate fittings that have been developed using triangulation, such as: rectangle to round offset, round tapes, rectangle to round pitch at the top, 3 pc. rectangle-to-round elbow.

#### Objectives:

• Demonstrate the proper use of hand tools to cut out and form parts needed for the fitting.
• Demonstrate the proper set up and use of bench and floor machines to form parts for a fitting.