Tooth spacing: mm Gear ane teeth: Rack&pinion Measured cal altitude:  (impress 144 DPI)

Contact angle: deg Gear ii teeth: Two gears Spokes: Show spokes

Shaft pigsty dia.: mm Testify rotated: % of 1 tooth

Pitch bore Line of contact Bear witness center Show cm filigree Animate Dividing plate Explicate fields (Help)

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Help / how to use it / well-nigh

This free online gear template generator is designed for making scale accurate paper gear templates which you lot can mucilage onto wood and then cutting out with a bandsaw. I recommend printing the gears with an ink jet printer. Even inexpensive ink jet printers print very scale accurate only not all laser printers are authentic.

Legend (What do the fields higher up hateful?)
Tooth spacing Number of millimeters from one molar to the next, along the pitch bore. Gear 1 teeth: Number of teeth on gear to render for gear. Controls left gear when showing two gears. Enter negative value for band gears. Rack&Pinion: Change gear 1 to a linear gear (rack). You can also make the other gear a rack by entering "0" for the tooth count. Measured cal distance (mm): After press a test page, mensurate the altitude between the lines marked "this should be 150 mm". If it'south non 150 mm, enter the value in this field to compensate for printer scaling. The next printout should be the correct size.		Contact bending(deg): The pressure angle of the gears. For gears with smaller number of teeth, set this a chip larger, to get more sloped teeth that are less likely to jam. Gear two teeth: Number of teeth for the gear on the correct, if rendered. The checkbox controls whether one or two gears are rendered. Two gears: When printing templates, it helps to have simply one gear shown. Spokes: Show the gear with spokes. Spokes are just shown for gears with 16 or more teeth.		Shaft hole dia. (mm): What size to draw the shaft hole. For inside (planetary) gearing, fix this larger than the gear to describe a circle around the gear Prove rotated: Rotate the gears shown slightly. Useful for checking the fit of gears at different angles when showing 2 gears on the screen. Employ values 0 to 100 to bespeak pct of one molar advance of rotation. Print gears: This office hides the text at the lesser of this page and tells your browser to start the "print dialog" to print this page.		Show pitch diameter Show the pitch diameter of the gears. The pitch diameter is the effective diameter of the gear. Bear witness line of contact Shows the pressure angle, and the base radius. Show cm grid Show a 1 cm grid. Utilise the "printed page width" to scale exactly to your printer Animate Plow the gears on the screen. Good for checking meshing of gears with small numbers of teeth. Dividing plate mode Sometimes you simply desire to divide a circle into something like 17 equal parts, and the gear template is handy for that. Checking this option simply draws the dividing lines and no gear teeth.

Getting the printout to scale correctly, fugitive cropping

Different browsers impress at different scales depending on browser blazon and printer configuration. The default scale should be correct for firefox, Cyberspace explorer x and Google Chrome. If the scale is non correct (that is, the filigree is not 1 cm increments), measure out the altitude that is labeled "If this is non 150 mm..." in millimeters and enter information technology in the field "Measured cal altitude".

Use an ink jet printer
I recommend using an ink jet printer. The colour registration requirements of ink jet print heads requires manufacturers to make sure the image is not stretched in either direction, so even cheap ones are quite calibration accurate. Some laser printers stretch or distort.

Printing the gear templates
To print the gear template, use the 'Impress' button, instead of printing the web page from the browser. The print button hides those parts of this page that you don't desire to print, then brings up the print window. To get the sizes specified to be right, it'due south best to impress a test template, and so mensurate the distance between the lines at the bottom of the paradigm, and enter that nether "Measured cal distance". Only enter this once (the value volition reset). Subsequent printouts should be scaled then that the millimeters are exact and the grid has 1 cm spacing.
This program just prints what fits on the screen. To fit more, you tin zoom out in your browser on a PC by property downwardly the 'Ctrl' key and puhing the '-' central.
For gears larger than a sheet of paper, the gear is commencement from middle. If your gear has an even number of teeth, you can print information technology twice and paste the halves together. If the number of teeth is divisible past 4, you tin impress information technology iv times and paste together. Yous can print gears up to forty cm (xvi") in diameter this manner.

The gear generator program that I created and sell doesn't need the scale calibration, and tin paginate across many pages for larger gears.

Some notes about gear design and this gear template generator

This template generator is intended for generating paper templates for cutting low precision gears from plywood, phenolic, or other suitable materials with a band saw.

This gear template generator generates shapes for involute spur gears. Involute spur gears have involute shaped teeth. The all-time way to explain how the involute is formed is to select two gears, and check the "show line of contact" checkbox. The cherry line will show the line of tooth contact for the given gears, besides as the base circles. The gears work as though a string was unwound from the correct gear's base of operations circle, and wound onto the other base of operations circle. A point on the string essentially traces the involute of the teeth. Note that the teeth always brand contact along the red line, and exactly perpendicular to the line. The angle of this line with respect to vertical is the pressure angle ('Molar bending' field in the form in a higher place)

The gear tooth generation is not perfect. Normally, one rounds the tips of gear teeth a footling bit, which this program doesn't do. Also, for gears with less than about 10 teeth, and low tooth angles, it'south sometimes necessary to narrow the teeth at the base (undercut) or to alter the geometry (profile shifts). So some combinations with gears of small numbers of teeth may overlap, or jam if they were existent. You can check to run across if the gears would overlap by selecting the 'animate' and 'ii gears' checkboxes for your gears and watching them plough. My non-free gear programme will automatically calculate the necessary undercut to make the gears mesh.

Ring gear / planetary motion gears
You can also generate templates for inside gearing, such as would be used for planetary move gears. Simply enter a negative number of teeth for ane of the gears, and that gear volition exist an inside gear. Select a large number for the shaft bore when making a template to get a circumvolve around the gear. For more than virtually how to work out the number of teeth and ratio, meet this note on planetary gear ratios and calculations

Rack and pinion gearing
You can also generate rack and pinion gears. Only enter zero for the number of teeth of a gear, and the plan will depict a directly gear rack instead of a gear for that gear.

The involute shape of gears is very important for gears that run at loftier speed. Still, for wooden gears with more than 12 teeth, it doesn't matter every bit much. Fifty-fifty if you don't cutting the gears with an involute shape, the template generator is all the same useful as a form of protractor using the "dividing plate manner" for dividing the circle into even intervals. For an case of a different method of cutting gears, see my Wooden gear cutting jig

Any questions? You can electronic mail me at