GearGen.XYZ
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Development Log

Recent Updates

Planetary Fixed / Auto Δz2

The Planetary Gear Calculator now supports Fixed (Δz2 = 0, equal teeth) and Auto reduced planet deficit (0.5 / 1 / 1.5) with coaxial profile-shift balance for sun–planet and planet–ring center distances. Mounting and adjacent conditions are shown alongside coaxial status.

2026-10-15

ISO 53 hob / basic rack selection

Choose the hob (basic rack) per gear: ISO 53 Types A–D, plus an Ash Gear 1.35 pregrind protuberance hob with finishing-stock input. Tip radius and clearance feed profile-shift limits, trochoid roots, and the Advanced Gear Data Report hob sketch.

2026-10-15

ISO 6336 and AGMA load capacity rating

Advanced Gear Data Reports now rate spur, helical, herringbone, and planetary meshes with ISO 6336-1/-2/-3:2019 Method B (allowables from ISO 6336-5) or ANSI/AGMA 2001-D04 · 2101-D04, matched to SI or inch units. Geometry methods include ISO 21771 and AGMA 908. See the homepage Geometry and rating methods section.

2026-10-08

Rack & Pinion Calculator

Released the Rack & Pinion Calculator (helical rack and pinion, ISO 53 tooth depth). Pitch-line space equals tooth thickness; rack length stays in sync with tooth count. 2D DXF/SVG and 3D STEP/STL/GLB export. Rack hero embeds on the landing page.

2026-09-06

Diametral pitch and inch units (AGMA 913)

Calculators now have an SI / IN toggle. SI stays on ISO 21771 (module, mm). IN uses AGMA 913-A98 English-unit equations with normal diametral pitch Pnd and inches — report formulas divide by Pnd instead of multiplying by module. See common diametral pitch and the module to diametral pitch converter.

2026-09-05

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Standards

  • • DIN 780, Series I and II, Common Modules for fine and coarse modules.
  • • ISO 53 Basic Rack Profile (Types A–D) and protuberance / pregrind hob options.
  • • ISO 54 Cylindrical gears for general engineering and for heavy engineering - Modules
  • • ISO 21771 used for gear geometry calculations.
  • • AGMA 908 / AGMA 913 geometry and inch tooth specification.
  • • ISO 6336-1/-2/-3:2019 Method B load capacity; allowables from ISO 6336-5.
  • • ANSI/AGMA 2001-D04 and 2101-D04 rating (inch and metric).
  • • DIN 3967 backlash values for gears.

Added Features

  • • Spur gear calculator to help design spur gearsets.
  • • Helical gear calculator to help design helical gearsets.
  • • Herringbone gear calculator to help design herringbone gearsets.
  • • Planetary gear calculator to help design planetary gearsets.
  • • Planetary Fixed / Auto Δz2: equal-teeth (Δz2 = 0) or reduced planet deficit (0.5 / 1 / 1.5) with coaxial profile-shift balance.
  • • Rack and pinion calculator to help design helical racks and pinions.
  • • SI / IN unit toggle: ISO 21771 module (mm) or AGMA 913 diametral pitch (inches).
  • • Geometry methods in the Advanced report: ISO 21771 and AGMA 908.
  • • Load capacity rating: ISO 6336 Method B and AGMA 2001/2101 (spur, helical, herringbone, planetary).
  • • Hob / basic rack selection (ISO 53 Types A–D) with tip radius and clearance for roots and profile-shift limits.
  • • Protuberance / pregrind hob option with finishing-stock input and hob rack sketch in the report.
  • • 3D viewer and CAD export options: STEP, STL, and GLB.
  • • Common and preferred modules based on ISO 54 and DIN 780.
  • • Common diametral pitch values for inch-system gears.
  • • Expanding gear report with data.
  • • Power, torque, force, and stress / rating results in Advanced reports.
  • • Gear ratio calculations for basic geartrains.
  • • Speed, RPM, and ratio calculations for gearsets.
  • • Kinematics calculations for planetary gearsets.
  • • Geartrains in cascading tabs.
  • • Play pause and reset buttons for the animation.
  • • Reverse button to reverse the animation.
  • • Custom x,y grid system for positioning gears.
  • • Backlash input for gears, referenced from AGMA, DIN and ISO.
  • • Part number and description input for gears.
  • • Profile shifts for adjusting the gears sizing.
  • • Profile shift limits for avoiding undercutting and pointed tops.
  • • Preferred number of teeth for span measurement.
  • • Minimum and maximum number of teeth for span measurement.
  • • Being able to select different driving gears for geartrains.
  • • Inspection measurements for gears span.
  • • Save your gears and gearsets with an account.
  • • Share your gears and gearsets with others.
  • • Embed your gears and gearsets in your website.
  • • Engineering References section.
  • • Base pitch table lookup tool to help narrow down the number of teeth to span (k) by pressure angle to then verify the base pitch.
  • • Module to diametral pitch converter tool to help convert between module and diametral pitch.

Upcoming Improvements

  • • Gear report data can be exported to CSV or Excel.
  • • Single tooth gear profile export
  • • Export to additional CAD formats
  • • User preferences and settings
  • • Additional hob / basic rack catalogs beyond ISO 53 and Ash pregrind.
  • • Shaft and blank editor component.

Known Issues

  • • when shrinking the window width, the animation speed play pause component is overlapping on the layout.