GEAR MANUFACTURING GEAR DESIGN

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Q&A

INDUSTRY NEWS | 2014-05-01

Machine Marks on Gear Flanks

What causes shaving cutter marks on gear flanks and can they be prevented?

INDUSTRY NEWS | 2001-09-01

Hidden Runout

Q&A is an interactive gear forum. Send us your gear design, manufacturing, inspection or other related questions, and we will pass them to our panel of experts.

INDUSTRY NEWS | 2001-05-01

Calculating Dynamic Loads, Sizing Worm Gears and Figuring Geometry Factors

Q&A is an interactive gear forum. Send us you gear design, manufacturing, inspection or other related questions, and we will pass them to our panel of experts.

INDUSTRY NEWS | 2000-07-01

Determining Lead Error on a Crowned Pinion

Q&A is your interactive gear forum.

INDUSTRY NEWS | 1999-09-01

Calculating SAP and TIF

Q&A is your interactive gear forum. send us your gear design, manufacturing, inspection or other related questions, and we'll put them before our panel of experts.

INDUSTRY NEWS | 1999-03-01

Redliner Charts and Gear Inspection

Q&A is your interactive gear forum. Send us your gear design, manufacturing, inspection or other related questions, and we'll put them before our panel of experts.

INDUSTRY NEWS | 1995-09-01

Gear Inspection For The Long Haul

Question: We just received permission to purchase our first CNC gear inspection system. With capital approvals so hard to come by, especially for inspection equipment, I want to be sure to purchase a system I can count of for years to come. My past experience with purchasing CNC equipment has shown me that serviceability of the computer and the CNC controller portion of the system can be a problem in just a few years because of the obsolescence factor. What information do I need to look for when selecting a supplier to reduce the risk of obsolescence, as well as to reduce the long-term servicing costs in the computer and controls portion of the system?

INDUSTRY NEWS | 1995-07-01

Dry Gear Hobbing

Question: We are contemplating purchasing a hobbing machine with dry hobbing capabilities. What do we need to know about the special system requirements for this technology?

INDUSTRY NEWS | 1994-09-01

Our Experts Discuss Electronic Gearboxes, Plus Backlash and What to Do about it

Question: In the January/February issue of your magazine, we came across the term "electronic gearbox." We have seen this term used elsewhere as well. We understand that this EGB eliminates the change gear in the transmission line, but not how exactly this is done. Could you explain in more detail?

INDUSTRY NEWS | 1994-01-01

Cutting Worm Gears with Standard Gear Hobs

We make a lot of single-start worm and worm gear sets, and it always seems as though we're buying another special hob. We also do a lot of spur gear cutting, and the spur gear hobs and the worm gear hobs look alike, so we wonder why we cannot use the standard hobs for cutting worm gears too. Can we do this?

INDUSTRY NEWS | 1993-07-01

Gear Tip Chamfer and Gear Noise; Surface Measurement of Spiral Bevel Gear Teeth

Could the tip chamfer that manufacturing people usually use on the tips of gear teeth be the cause of vibration in the gear set? The set in question is spur, of 2.25 DP, with 20 degrees pressure angle. The pinion has 14 teeth and the mating gear, 63 teeth. The pinion turns at 535 rpm maximum. Could a chamfer a little over 1/64" cause a vibration problem?

ASK THE EXPERT | 1993-05-01

Using Hobs for Skiving; A Pre-Finish and Finishing Solution

Our company manufactures a range of hardened and ground gears. We are looking into using skiving as part of our finishing process on gears in the 4-12 module range made form 17 CrNiMO6 material and hardened to between 58 and 62 Rc. Can you tell us more about this process?

INDUSTRY NEWS | 1993-03-01

Gear Material Quality: How To Judge It...Pitting: How To Prevent It

How do we know when the gear material we buy is metallurgically correct? How can we judge material quality when all gear material looks alike?

INDUSTRY NEWS | 1993-01-01

Application Analysis

Questions: I have heard the terms "safety factor," "service factor," and "application factor" used in discussing gear design. what are these factors an dhow do they differ from one another? Why are they important?

INDUSTRY NEWS | 1992-07-01

Cutting Low-Pitch-Angle Bevel Gears, Worm Gears and The Oil Entry Gap

Question: Do machines exist that are capable of cutting bevel gear teeth on a gear of the following specifications: 14 teeth, 1" circular pitch, 14.5 degrees pressure angle, 4 degrees pitch cone angle, 27.5" cone distance, and an 2.5" face width?

INDUSTRY NEWS | 1992-03-01

Our Experts Discuss Hobbing Ridges, Crooked Gear Teeth, and Crown Shaving

Question: When cutting worm gears with multiple lead stock hobs we find the surface is "ridged". What can be done to eliminate this appearance or is to unavoidable?

INDUSTRY NEWS | 1992-01-01

A Clockwork Gear

Question: Could you explain what is meant by "horological gearing"? I never heard of this before, although I understand it has something to do with watches. Could you also explain the meaning of a "going gear train"?

INDUSTRY NEWS | 1991-11-01

Gear Inspection Chart Evaluation; Specifying Unusual Worm Gear Sets

Question: When evaluating charts from a gear inspection machine, it is sometimes found that the full length of the profile traces vary, and that sometimes they are less than the length of active profile (above start of active profile-SAP) by up to 20%. This condition could be caused by a concentricity error between tooth grinding and shaping, or by unequal stock removal when grinding. (See Fig. 1.) Is it possible that some of the variation is coming from the inspection machine? How can variation from the inspection machine be reduced?

INDUSTRY NEWS | 1991-09-01

Single Flank Measuring; Estimating Horsepower Capacity

Question: What is functional measurement and what is the best method for getting truthful answers?

INDUSTRY NEWS | 1991-07-01

Pineapples, Corncobs & Other Hobbing Matters

Two questions on hobbing cover the various types of hobs and their unusual names, as well as the importance of hob swivel angle.

INDUSTRY NEWS | 1991-05-01

Misalignment No Beauty in Gearsets

When we have problems with gearset failure, a common diagnosis is misalignment. What exactly is that and how do we prevent it? The second most common "killer" of good gear sets is misalignment (dirt, or abrasive wear, is first). Gear teeth simply won't carry the load if they don't touch, and the portion that does touch has to carry an overload to make up for the missing contact area.

INDUSTRY NEWS | 1991-03-01

Our Experts Discuss...

Question: I have just become involved with the inspection of gears in a production operation and wonder why the procedure specifies that four involute checks must be made on each side of the tooth of the gear being produced, where one tooth is checked and charted in each quadrant of the gear. Why is this done? These particular gears are checked in the pre-shaved, finish-shaved, and the after-heat-treat condition, so a lot of profile checking must be done.