Rabbeting To cut a rabbet on the jointer, your machine must be equipped with a rabbeting ledge and the knives must project beyond the cutterhead. While routers and dado blades may be more efficient at cutting most rabbets, the jointer offers the ability to cut a wide rabbet. See Figure 25-13. With a jointer, you can cut a rabbet in a single pass or in several passes. If you cut the rabbet in one pass, you may need to reduce the speed of the feed. To cut a rabbet on a small jointer, you may find that you can cut only one-half or one-third of the depth of the rabbet during one pass. Chuck Davis Cabinets Figure 25-12. Jointing a bevel. Patrick A. Molzahn Figure 25-13. Jointers that are equipped with a rabbeting ledge can be used for rabbeting. Deep cuts should be made with multiple passes. Cutting a Rabbet This process will require that you remove the guard. Follow these steps: 1. Ensure the cutterhead is capable of cutting rabbets. 2. Remove the guard over the cutterhead. 3. Move the fence until the exposed part of the knives is equal to the width of the rabbet and lock the fence in this position. 4. Lower the front table until the depth of cut is equal to the depth of the rabbet. 5. Make a trial cut on a piece of scrap wood and adjust as required. Procedure Green Note Processing wood creates a great deal of residue. Piles of chips and shavings from saws and planers quickly pile up. Pelletizers and briquetters can convert this waste into material that can be easily handled and sold for use in wood burning furnaces. Instead of paying to have the material hauled away, there may be a ready- market in your own backyard. Cutting a Rabbet in Three Passes To make a rabbet in three passes, do the following: 1. For the first pass, set the depth to one-third of the rabbet depth. 2. For the second pass, lower the infeed table until the depth scale shows about two-thirds of the rabbet depth. 3. For the third pass, lower the infeed table until the exact depth of the rabbet shows on the scale. Procedure A larger jointer can cut rabbets up to 3/8″ deep in one pass without the danger of kickback. Working Knowledge To reduce tearout and produce a cleaner rab- bet, precut the inside edge of the rabbet by grooving the board on a table saw before machin- ing. See Figure 25-14. 428 Section 4 Machining Processes Copyright Goodheart-Willcox Co., Inc. Summary • Cabinetry must fit the needs of the people who use it. • Human factors are the design considerations that take into account the needs of the people who use a product. In cabinetry design, these factors include the user’s ability to reach and bend, body dimensions, line-of-sight issues, space problems, and safety. • Furniture and cabinetry manufacturers use stan- dard dimensions when building their products. These dimensions are based on an average-size person using the product. They specify height, width, and length. • Activities done while standing involve reach- ing, bending, and stooping. Cabinets and furni- ture designed for standing activities must take these movements into consideration. • Seated activities include dining, working, and relaxing. Seats should be designed for comfort and convenience. • Chairs, desks, and tables should allow the user freedom to move. • Individuals in wheelchairs have special needs. Adapt counter heights for their reach. Space must also be allowed for wheelchair movement. • Consider human factors, such as height and weight, when designing furniture in which people recline. • Line of sight is a straight line between the eye and the object seen. This concept is important when designing furniture used for television viewing or computer use. • Standards exist for many of the dimensions dis- cussed. Standard dimensions will meet the needs of the majority of people. Comply with them unless you are adapting for the elderly and disabled. • Design with safety in mind. Minimize sharp corners and edges. Anticipate the potential for objects to fall and design to counter it. Remember hazards to children and design to avoid them. Test Your Knowledge Answer the following questions using the information provided in this chapter. 1. Describe five of the human factors. 2. Standard dimensions are based on the _____. A. average-size child or adult B. largest child or adult C. smallest child or adult D. None of the above. 3. Standard dimensions specify _____. 4. Standard counter height is _____ inches. 5. What dimensions are provided for chair size? 6. A person is positioned upright in a(n) _____ chair. 7. A person is in a reclined and relaxed position in a(n) _____ chair. 8. What dimensions determine the size of a bed frame? A. height of a person B. mattress size C. size of the bedroom D. weight of a person 9. _____ is a straight line between the eye and the object seen. 10. When a person is standing, the normal line of sight is _____ degrees downward. Suggested Activities 1. Measure the cabinets in your kitchen. How tall is the counter? How deep are the base cabinets and upper cabinets? What is the distance from the countertop to the upper cabinets? Make a sketch to show these measurements and share this with your instructor. 2. Measure at least five different chairs. Create a chart comparing their seat heights, distances between the front edge of the seat and the backrest, and the overall height of the back- rests. Circle the chair measurements which are most comfortable for you. 3. Create a chair mock-up with an adjustable backrest. Experiment with the angle of the back, starting at the vertical position (0°). Adjust the angle in 3° degree increments. Which angle is most comfortable for relaxing? Which angle is best for working on a computer? Share your observations with your class. 104 Section 2 Design and Layout Copyright Goodheart-Willcox Co., Inc. Relate chapter content to sustainability, energy efficiency, and other environmental issues. Green Notes Provide supplemental information and hints related to the components or procedures discussed in the text. Working Knowledge Provides an additional review tool for the student. Summary Designed to reinforce the material covered in the chapter. Test Your Knowledge Tasks designed to help students expand their knowledge of chapter content or to gain competence in the subject area. Suggested Activities Copyright Goodheart-Willcox Co., Inc. xi