The article “Helical Gear Mathematics Formulas and Examples” appeared in the May/June issue of Gear Technology. Summary The following excerpt is. Hobbing isa continuous gear generation process widely used in the industry between first and second cut so that a different formula isused. Spur Gear design formula for geometry, pitch, tooth clearance and critical functional data. Circular Pitches and Equivalent Diametral Pitches Table.

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It is very useful in the design of some equipment, such as lifting, in that thedrive can stop at any position without concern that it fkrmula slip in reverse. If you have reinstalled your program to a new PC and you have a backup copy of the program’s home folder, then the following tables show the files to copy from your backup.

The accuracy depends on the quality of your Hob machine setup runout, bore concentricity to pitch line, machine alignment and tightness, etc and the accuracy of your lead measurements. To reverse rotation the total number of rotating shafts must change.

Basic Gear Terminology and Calculation

As the workpiece rotates, hob teeth no longer fall into previously cut spaces, but are shifted slightly in a direction tangent to the workpiece.

Four different diameter bodies will cut a wide range of gear sets. As a licensed user you will, from time to time, find it necessary to request hbbing new Activation Key. This is a very complex method, both theoretically and practically.

Drop vear the choices and select “minimize”. The size of gears is determined in accordance with the reference diameter d and determined by these other factors; the base circle, Pitch, Tooth Thickness, Tooth Depth, Addendum and Dedendum. Further, the bearing loss, lubricant agitationloss, etc. Look for a close match to the constant you’ve measured here. Changing the window configuration is good if you start from an icon and you always want full screen: Reference diameter d of the helical gear with normal system can be calculated from Equation 2.

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Usually the blank bore will “settle” in close concentricity with the arbor.

If this machine is non-differential it is important to use the exact feed constant or as many decimal places as possible when generating helical gears. We will assume gwar a calculation was done that produced the following differential change gear set: With the correct index change gears, a single start cutter will rotate a number of revolutions equal to the teeth on the workpiece while the workpiece makes one complete revolution.

Files that save your user data. Users of all PC-based Windows desktop systems can create an icon that will let you start DOS applications with a “click” of the left mouse button. If the machine limit on OD nominally 30 Inch is not exceeded, then the set can be successfully cut, if tooth taper is acceptable.

Spreadsheet for gear hobbing – Louis BĂ©let SA – Cutting tools – Vendlincourt – Switzerland

Q – S Model No. Clear petroleum jelly works well. If you recently acquired a machine but don’t know it’s constants, all three constants can be determined from a sample setup of change gears used to cut a particular helical gear. Tooth thickness s is basically half the value of pitch p. After throating is complete, set up hobbing machine to cut teeth as usual.

A few hints and suggestions. Here is a simple test to confirm machine’s feed constant. Lead is the distance traversed along the gear’s axis to geae one complete spiral revolution of a tooth centerline about the axis. This should cut a near perfect helix angle and assures us that b is not the problem.


Only the curve which goes on each tooth flank diagonally through the pitch point is useful for meshing of tooth flankof screw gears, and therefore the working face width is limited.

The formulq purpose of a dongle is to keep someone from stealing your licensed software copy and using it. How is a traditional hobbing machine set up to cut a spur gear?

Helical Gear Mathematics Formulas and Examples – May/June 1988

In other words, a formulx gear or throated worm gear could not be cut without a differential action that compensates for the motion of continuous hob shift. They are similar to the relationsin Formulas 4.

TXT file, the file name will appear in the summary. For this reason it is desirable to have a cutter body for each cutter configuration you normally use. Shiny spots, due to localized surface melting, are another indication of a dull cutter. Differential machines do not require an exact value of feed constant for a setup as long as the differential is engaged.

This will help us prioritize our work to your needs. Forumla is the change gear setup for a Fellow’s No. Where can I find parts for my SouthBend Lathe? I never met anyone using dongles that liked them. You will hardly get a burr when climb hobbing non-metallics. Check the cutter table angle setting. These are links to copyrighted material on other websites. This approach may not work every time just fromula and repeat but is much easier and quicker than trying to shim between bore and arbor or tapping into alignment.

Excerpts from a Mikron

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