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SET OF 5 GEARS AND BUSHINGS

CAT # GR-5 (8 Reviews) Write a Review

$3.50 each
10 + $3.00 each
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Product Description
Five matched break-resistant plastic gears ranging from 0.44" diameter (10 teeth) to 2.02" (50 teeth). Gears are molded with 0.15" (4mm) bores and come with inserts which reduce the bore to 0.075" (2mm) diameter. Set includes five gears and five inserts.
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews (8 Reviews)

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rotary

Reviewer: from ILL USA

need to know the pitch of the gear

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Gear pitch looks like about 26 or 27

Reviewer: from Longview, TX

Gear pitch looks like about 26 or 27, though I plan to use these gears only to mesh each other so it won't be a concern.
Here are my calculations. Please correct me if you see some math error here:
Gear Pitch = Number of Teeth / Pitch Diameter.
Let's estimate the tooth size first so we can approximate pitch diameter, which is approximately halfway down the teeth (see http://www.robotobjects.com/Techtips/Gear-Pitch-Explained.asp).
Let's also assume the teeth are approximately square.
Large gear diameter given = 2.02". Let's assume that's OD.
Circumference = 2.02 x Pi = 6.35"
Estimated tooth width for large gear = C / number of teeth / 2 = 6.35 / 50 / 2 = 0.0635.
Now let's estimate tooth width using given small gear dimensions and use the average.
Small gear OD = 0.44", num teeth = 10
C = 0.44 x Pi = 1.38
Estimated tooth width for small gear = C / number of teeth / 2 = 1.38 / 10 / 2 = 0.069.
Average estimated tooth width for large & small gears = (0.069 + 0.064) / 2 = 0.067
Pitch diameter (PD) is approximately OD - (2 x 1/2 tooth width) = OD - tooth width.
Large gear PD = 2.02 - 0.067 = 1.95"
Small gear PD = 0.44 - 0.067 = 0.37"
Since Gear Pitch = Number of Teeth / Pitch Diameter,
Large gear estimated pitch = 50 / 1.95 = 25.6
Small gear estimated pitch = 10 / 0.37 = 27.0, so pitch is probably 26 or 27.

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Pitch Calculation

Reviewer: from USA, Iowa

The easy way to find the pitch accurately is to add two to the tooth count and use the outside diameter. Pitch = (N+2) / OD. this formula is exact for standard gears. Second, they are supposed to mesh so they are all the same. So, use the data for the largest gear given: 50 tooth and 2.02" OD. The largest gear should have the smallest percentage of error in the measurement. Anyway, 52 / 2.02 = 25.74 pitch. Not likely an English measure gear. Probably metric: to convert take reciporical and multiply by 25.4 (mm/in): 25.4 / 25.74 = 0.987. Considering a small measuremt error is likely, they are most likely metric module 1 gears.

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26 or 27 pitch not likely

Reviewer: from Los Angeles, CA

Though I am impressed by your math, I doubt the pitch is 26 or 27. Since they come in a kit, I would expect them to have a standard pitch like 16, 24, 32, etc. Plus, there were probably manufactured overseas. Converting the measurements to metric and comparing to those standards, it's a good chance those gears are a module (metric "pitch") 1.

http://en.wikipedia.org/wiki/Gear#The_module_system

Then again, All Electronics does have some wacky stuff from time to time.

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Handy Gearset

Reviewer: from Valencia

People who have these gears rate them at 5 stars. The guy who didn't buy then gave 3 stars because he wanted more info before he gambled $2.75 on a set of 4 gears. Scheesh. Excellent for mini lathe.

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