Creating Gears

[zstangkrewson]

ive been using V23 for almost a year now, i have gotten very profiicient at holes patterns and cutting gears blansk without teeth, now ive been tasked to create a gear for a plating barrel, and it seems that no matter what i do, I cannot copy a 52 tooth gear that is 17.08" OD, at 3 pitch... I have googled for tutorials on how to create gears, but i ant find anything, maybe im searching the wrong subject, does anyone have any formulas that are simple to create gears of any size, pitch and tooth count?

[dwood]

maybe this will help get you started
pitch is actually pitch diameter
you can see what i have set to get a gear
17.080 dia.
pitch dia. 16.50
root dia. 16.25
since i do not have the gear to measure the pitch and root dia are just a random number
machinery's handbook may have some formulas to help out

[winaa]

First you need to do some calcs
From the info you have given I think your pitch may be wrong- pitch=number teeth+2/OD
that equals 3.16167
from here we can work out the pitch diameter=number teeth/pitch
That equals 16.447
now we need to work out the whole depth of the tooth=2.25/pitch
That equals 0.7116 double this and take away from the OD to find the Root diameter
.7116*2=1.4233
17.08-1.4233
that equals 15.6567
plug these number in the gear generation utility under the Other Tab in BobCAD and you should get your gear.
Takes me back to my apprenticeship days

[Kiwi]

... 17.080 dia.
pitch dia. 16.50
root dia. 16.25....

0.58 between OD and PD and 0.25 between PD and RD doesn't look right.

My guess your gear with 52 teeth is 8 module (3.175 DP) which is 17.0079 OD, 15.5621 RD with 16.378 PD.

[zstangkrewson]

My guess your gear with 52 teeth is 8 module (3.175 DP) which is 17.0079 OD, 15.5621 RD with 16.378 PD.

it is 8 module!!! holy crap, i didnt know what 8 module was... nobody i work with did either, is there a chart i can use to figure out module vs pitch or = pitch???

Takes me back to my apprenticeship days

Ha Ha! im a newb, just a 34 year old who is doing what he can to keep a job... i have learned alot in the last year... and im hoping to learn more, im not real good at math, so i would join the training courses but my biggest fear is id fail them cuz of the math...

Thankyou very much for the help, hopefully i can get something drawn today... PEACE!

[mcphill]

it is 8 module!!! holy crap, i didnt know what 8 module was... nobody i work with did either, is there a chart i can use to figure out module vs pitch or = pitch???!

Gear - Wikipedia, the free encyclopedia

The module system

Countries which have adopted the metric system generally use the module system. As a result, the term module is usually understood to mean the pitch diameter in millimeters divided by the number of teeth. When the module is based upon inch measurements, it is known as the English module to avoid confusion with the metric module. Module is a direct dimension, whereas diametral pitch is an inverse dimension (like "threads per inch"). Thus, if the pitch diameter of a gear is 40 mm and the number of teeth 20, the module is 2, which means that there are 2 mm of pitch diameter for each tooth.

[winaa]

Is there a chart i can use to figure out module vs pitch or = pitch???

Diametral pitch=25.4/module
=25.4/8
=3.175

[zstangkrewson]

wanted to say thankyou to you guys and especially DWOOD for opening my eyes, v23 only has PITCH to enter instead of PITCH DIAMETER... once i realized that, making gear was easy! also thankyou for the formulas... helped alot, tyvm.