Term
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Definition
A number of teeth
Certain tooth size
Pressure angle |
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Term
| What are the three machining methods of a gear? |
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Definition
| Form Cutting, template cutting, Generating |
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Term
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Definition
| The cutter and work roll together as though in mesh. |
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Term
| What is template cutting? |
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Definition
| Cutting tool is guided by a master form or template by a machine called a gear planer. |
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Term
| What are some ways of form cutting a gear? |
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Definition
-Using a single point tool (Shaper, fly cutter)
-Rotary Cutters
-Broaches |
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Term
| When gear manufacturing what steps are needed to be taken in order? |
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Definition
1) Blanking
2) Gear Cutting
3) Heat Treating
4) Gear Finishing |
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Term
| Each DP has how many cutters to correspond with a certain number of teeth? |
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Definition
| 8 Cutters per DP. A standard set of cutters has 64 cutters |
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Term
| For DP Cutters, the smaller the cutter number, the ____ teeth on the gear. |
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Definition
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Term
| For Module Cutters, The ____ the cutter number, the more teeth on the gear. |
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Definition
| The larger cutter number. |
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Term
| The linear pitch of a rack must be ___ to the circular pitch of the pinion gear. |
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Definition
| The linear pitch of a rack must be EQUAL to the circular pitch of the pinion gear. |
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Term
| Gear Generating consists of? |
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Definition
| Hobbing and Shaping (Blank and Cutter rotate together) |
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Term
| Where can Hobs not be used? |
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Definition
| Can not be used for internal gears or when a gear sits next to a shoulder. |
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Term
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Definition
| Less material to make gear |
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Term
| What are some reasons for gear finishing? |
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Definition
| To correct the profile, lead and eccentricity |
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Term
| Methods of gear finishing? |
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Definition
| Shaving, Honing, Grinding, and Rolling |
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Term
| Gear rolling is not suitable for? |
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Definition
| Gears with teeth less than 18 teeth, pressure angles less than 20 degrees, and blanks harder than 28 RC |
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Term
| Two methods of gear grinding? |
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Definition
| Form Grinding and Generating |
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Term
| Why would you grind a gear? |
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Definition
| For finishing hardened material, For a good surface finish and Accuracy |
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Term
| Generating with a grinding wheel is? |
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Definition
| Slower but more accurate (Mimics action of mating with a rack) |
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Term
| How is gear shaving done? |
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Definition
| Done prior to hardening and is designed to remove .001-.004 |
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Term
| What are some methods of measuring a gear? |
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Definition
-Using a gear tooth vernier
-Wires
-Measure over several teeth |
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Term
| How do you use a gear tooth vernier? |
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Definition
| Set the vertical slide to the chordal addendum, and use the horizontal slide to the chordal thickness. |
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Term
|
Definition
| Backlash is the amount by which the tooth space exceeds the thickness of the tooth at the pitch circle. It is the clearance in the gear teeth |
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