Free spur gear DXF
Three numbers: outside diameter, tooth count, plate thickness. Measure the gear in your hand, or design a new one, and download a flat DXF for laser, waterjet or wire.
The tooth is generated, not drawn: a true involute and the true trochoid root, rated to ISO 6336 in bending and pitting.
Open the generatorSizes ↓
What you get
- The root a cutter would makeThe rack is rolled past the blank. Flank and trochoid root come out on their own, undercut too.
- A torque you can readIntermittent and continuous ratings to ISO 6336, the lower of bending and pitting, for the plate and process you pick.
- Identified from a caliperOutside diameter and tooth count give the module. A worn or shifted gear is flagged, not guessed.
- Refusals that name the fixIf it will not build a gear, it says which number to change and to what.
Standard gears · outside diameter in mm
ISO 54 modules · 161 sizes shown · tooth counts from 10A diameter opens the generator with the outside diameter and tooth count filled in; add your plate thickness to get the rating. A dash means the generator refuses that size on laser at every plate it allows (most often the gear is bigger than the sheet). The table is unshifted gears, so it starts at 18 teeth; with a profile shift the generator goes down to 10. The table is ISO 54 series I; the generator also takes series II, and any tooth count, not only these columns.
Questions
Is the spur gear DXF really free?
Yes. Enter the outside diameter, the tooth count and the plate thickness, and the generator builds the DXF. No sign-up, no payment.
I have an old gear. What do I measure?
Measure across the tips of two opposite teeth with a caliper, count the teeth, and measure the plate thickness. The generator works out the module from the first two, and tells you if the gear carries a profile shift.
Why is the tooth root different from other free generators?
Most draw the root as a circular arc. The root is where a gear tooth breaks, so we generate it the way a cutter makes it: the standard rack is rolled past the blank, and the involute flank and the true trochoid root come out of that on their own.
Is the gear rated?
Yes. Every gear gets a torque rating in root bending (ISO 6336-3) and surface pitting (ISO 6336-2), for intermittent and continuous duty, in S275 plate at the floor of the standard's lowest steel grade. The rating changes with the plate thickness and the cut process, which is why it is shown in the generator and not in this table.
Why does it refuse some gears?
It refuses undercut teeth, pointed tips, a disc too thin not to dish, a module finer than the cut process can enter, and a gear bigger than the sheet. Each refusal names the input to change and the value that would work.
What is not covered?
It rates one gear's teeth against an identical mate. It is not a gearbox, shaft or bearing check, and the rating holds only under the conditions printed on the file.