Wow, that's a much more high-quality answer than I expected Okay, your turn!mjcox2000 wrote:A gear, whose cross-section (perpendicular to the axis of rotation) is the same at all heights along the gear, having an integral number of teeth projecting out radially, each tooth at a constant angle from those next to it.UTF-8 U+6211 U+662F wrote:Oops, that's not the right question.UTF-8 U+6211 U+662F wrote:Reviving this thread:
Question for Simple Machines:
Who identified the pulley?
Instead, define a spur gear.
Simple Machines B/Compound Machines C
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Re: Simple Machines B/Compound Machines C
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Re: Simple Machines B/Compound Machines C
Explain how spur gears, helical gears, herringbone gears, and worm gears differ, and the merits and faults of each of those gear types.
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Re: Simple Machines B/Compound Machines C
Spur gears are standard gears useful for changing torque, speed or rotational direction of motion; however, they stick easily. Worm gears have low efficiency, but can be used in some specialized situations where a lot of friction is required (ex. screws). I can't remember what helical and herringbone gears are.
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Re: Simple Machines B/Compound Machines C
Unome wrote:Spur gears are standard gears useful for changing torque, speed or rotational direction of motion; however, they stick easily. Worm gears have low efficiency, but can be used in some specialized situations where a lot of friction is required (ex. screws). I can't remember what helical and herringbone gears are.
curved gear (angled teeth)
type of double helical gear
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Re: Simple Machines B/Compound Machines C
You've both touched on it, but didn't quite give all the details I was expecting.UTF-8 U+6211 U+662F wrote:Unome wrote:Spur gears are standard gears useful for changing torque, speed or rotational direction of motion; however, they stick easily. Worm gears have low efficiency, but can be used in some specialized situations where a lot of friction is required (ex. screws). I can't remember what helical and herringbone gears are.curved gear (angled teeth)Still have no idea though!type of double helical gear
Spur gear: Simplest gear type. Teeth protrude out radially from a gearwheel; cross-section is the same at all heights. Spur gears can mesh with one another for a mechanical advantage. Helical gear: Similar to a spur gear; however, the teeth are not vertical, but wrapped around the outside of the gearwheel at a certain angle from vertical (i.e. each tooth can be thought of as part of a helix). Helical gears mesh with other helical gears with teeth offset from vertical at the same angle. They are used because a greater Herringbone gear: Two helical gears, placed back-to-back. They have the benefits of a helical gear (increased surface area), but without the sideways thrust. A herringbone gear meshes with another herringbone gear. Worm gear: A helical gear with teeth wrapping more than a full rotation around the gearwheel (i.e. a screw). A worm gear often has only one tooth. Worm gears drive [b]spur or helical gears[/b], not other worm gears. They always have an IMA greater than 1.
Last edited by mjcox2000 on March 26th, 2015, 5:52 pm, edited 1 time in total.
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Re: Simple Machines B/Compound Machines C
Yeah... something I'll have to memorize out of the binder for Nationals (although last year's test wasn't that difficult, so I'm not really sure what to expect)mjcox2000 wrote:You've both touched on it, but didn't quite give all the details I was expecting.UTF-8 U+6211 U+662F wrote:Unome wrote:Spur gears are standard gears useful for changing torque, speed or rotational direction of motion; however, they stick easily. Worm gears have low efficiency, but can be used in some specialized situations where a lot of friction is required (ex. screws). I can't remember what helical and herringbone gears are.curved gear (angled teeth)Still have no idea though!type of double helical gearSpur gear: Simplest gear type. Teeth protrude out radially from a gearwheel; cross-section is the same at all heights. Spur gears can mesh with one another for a mechanical advantage. Helical gear: Similar to a spur gear; however, the teeth are not vertical, but wrapped around the outside of the gearwheel at a certain angle from vertical (i.e. each tooth can be thought of as part of a helix). Helical gears mesh with other helical gears with teeth offset from vertical at the same angle. They are used because a greater Herringbone gear: Two helical gears, placed back-to-back. They have the benefits of a helical gear (increased surface area), but without the sideways thrust. A herringbone gear meshes with another herringbone gear. Worm gear: A helical gear with teeth wrapping more than a full rotation around the gearwheel (i.e. a screw). A worm gear often has only one tooth. Worm gears drive [b]spur or helical gears[/b], not other worm gears. They always have an IMA greater than 1.
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Re: Simple Machines B/Compound Machines C
I still have no idea. So, I'm presuming mjcox is asking another question?
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Re: Simple Machines B/Compound Machines C
Hopefully. His questions are good.UTF-8 U+6211 U+662F wrote:I still have no idea. So, I'm presuming mjcox is asking another question?
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Re: Simple Machines B/Compound Machines C
Of course, I barely studied!Unome wrote:Hopefully. His questions are hard.UTF-8 U+6211 U+662F wrote:I still have no idea. So, I'm presuming mjcox is asking another question?
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