Spur Gear Stock

Gear stock is perfect for creating custom sized gears, or up-integrating shaft features to reduce part count in assemblies. It can be loaded into a lathe or mill and machined to any number of shapes and given any number of bores to meet your specific needs.

Some examples of what you can do when designing with gear stock as opposed to off the shelf gears include am-3013b and am-3018b.

Selecting a Gear Stock

Tooth Profile

First, and most importantly, the tooth profile. If you are interfacing with another gear you need to know its Diametral Pitch (DP, for imperial gears) or Module (MOD, for metric gears). This number governs the size of the tooth, and meshing gears must have the same size tooth. Within these sizes there can be various pressure angles. These also need to match for meshing gears. To avoid confusion we do not sell gear stocks with the same "tooth size" and different pressure angles and for this reason we have combined these 2 parameters into one dropdown. In FRC 20 DP, 14.5° PA is the most common, followed by 32 DP, 20° PA. The rest of our gear stocks are used in specialty applications.

Tooth Count

Next, you will want to select tooth count. We have many options here and this is usually dictated by your design and what gear ratio you want to achieve, or which gear you may be trying to replace. Note that tooth count directly affects gear diameter, so if you need to put a specific size shaft through the gear you are picking make sure the gear is going to be large enough. All the CAD files for all these gear profiles are available at the bottom of this page.

Material

After specifying the above parameters you will be presented with a list of available materials available for those options. If you require your gear to be a specific material specify this first and the other options will narrow to ones that are available in this material. If you are curious about the specific alloy number of the material selected (for example 6061 Aluminum or 4140 Steel) check the part number that is generated below the last dropdown. The 4 digit number near the end is the alloy number.

Part Number

Once you have made a selection in each of the options you will be given a part number. This number contains all the information you selected above and can be used to locate the appropriate CAD file below. If you would like to interpret the number, it is set up as follows:

gs-P-S-T-A-1
gs - indicates Gear Stock
P - indicates the Pressure Angle
S - indicates Diametral Pitch or Module
T - indicates Tooth Count
A - indicates Alloy Number of the Material
1 - indicates the length (in feet) of your piece of stock