Digital Plans for DIY Projects, Shop Improvements, and Tools
Below is a collection of CALCULATORS we have found useful in our shop. They have been designed and built for use in the office when doing design or quoting, or in the shop on your mobile device. The results are easy to e-mail and pre-formatted for Excel.
Measurement Over Pins
An essential calculator for designing and testing gears - is the tooth thickness correct for a good mesh?
Gear Dimension Calculator
Calculate the gear diameters, Pitch, Outside, Base, & Root as well as Addendum, Dedendum, working depth and whole depth
Viscosity Index Calculator
Determine the Viscosity Index of your oil
Pitch Plate - Gear Workholding
Securely hold a gear on its pitch line with three pins
Gear Ratio Calculator
Calculate the gear ratio for your gearbox - allows for up to 8 gears and multiple gears on the same shaft
Your source for information about machine oils, lubricants, and lubrication for your machine shop and industrial maintenance.
Gear Span Calculator
Measure and check your gear by measuring over a fixed number of teeth, not across the entire gear. No pins required!
Center Distance Calculator
Know how far apart two gears should be, helpful for positioning shafts and adding backlash
Change Gear Calculator
Calculate change gears to run your machines: lathes, hobbers, shapers, and more!
Spur Gear DXF Generator
Generate a DXF file of involute spur gears, perfect for laser cutting, CNC routing, and waterjets
Looking for something else? Let us know what we can
add to the Evolvent Knowledge Base