Agricultural Engineering Part 2 Guided Notes

Agricultural Engineering Part 2 – Guided Notes

D. Planning an Agricultural Engineering Project –using drawing instruments.

1. Simple Project Designs

a. The first item needed for the highest quality scaled drawing is a ______.

b. A ______is used for drawing and measuringangles.

c. A good ______helps make corrections without distorting theimage.

d. A twelve-inch ruler will work for ______drawings.

e. A ______is used for drawing circles and arches.

2. More Detailed Plans

a. A ______is used for attaching the drawing paper.

b. Masking tape is used to secure the drawing paper to the drawing board.

c. The ______is helpful for drawing ______lines.

d. The ______(30, 60, 90 degree triangle) in conjunction with the ______, is used to draw ______lines.

e. The ______is an instrument with all increments ______according to proportion.

1) ______– looks similar to a ruler.

2) ______– three sided, but six scales.

3. Large Scale Projects

a. Use ______(computer- aided design) for these projects.

b. CAD can significantly reduce design time for large scale projects.

E. Basics of Drawing

1. A ______is a rough drawing that is ______to scale. A sketch does have______included. ( Many a project idea has first been sketched on a napkin over lunch ).

2. A pictorial drawing shows all three dimensions at once. All three views, front, side (end), and top are in view. (picture on p. 281)

3. A scale drawing is one that represents an object in exact proportion although the object is larger or smaller than the drawing itself.

4. If the scale is ¼” =1’, _____ on the drawing would equal ____ on the actual object. Therefore, a 2” line on the drawing would equal 8’ on the object (2 divided by ¼ = 8).

5. The scale will vary depending on the size of the object being drawn.

F. Reading a Tape Rule

1. Tape rules display units of measure from both the U.S. customary system and the metric system.

2. Rules are marked to show halves, quarters, eighths, and sixteenths of an inch. Typically, vertical lines of different heights represent these various intervals.

G. Basic Construction Project Tips

1. Wood Projects

a. The fastest way to fasten wood is by______. A nail hammer or nail gun are the preferred tools for driving nails.

b. ______hold better than nails and are driven quickly with power screw drivers. The flathead screw is the one most used in woodworking. The ______head is preferred.

c. ______are particularly useful for fastening wood at high stress points ( ie. picnic table legs).

d. ______– a properly glued wood joint will be as strong as the wood itself.

1) Gluing is often accompanied by nails, screws, etc.

2) Boards are held in place for gluing by clamps. Bar clamps are one type of clamp used.

2. Metal Projects

a. ______is the most commonly used metal in agricultural mechanics. There is at least ______kinds of steel.

b. Marking steel for cutting presents a special problem as pencil marks generally do not show up well.

c. ______is a soft, gray rock that is cut into thin pieces resembling pencils. Soapstone shows up well on most metals.

d. The hand tool most often used for cutting metal is the ______. Hacksaws are especially useful for cutting thin conduit.

e. Metal cutting band saws and power hacksaws may be used for large projects.