How to ask a Q and a about gears?
“Q&A About Gears” offers gear-related technical information based in the form of “Question and Answer”. We will keep adding more information in the future. TEL : +81 48 254 1744
Where does the breakage occur on a KHK gears?
Explanation : The breakage often happens at the end of the single edge of the gear. The breakage surface is kept with metal crystal graininess, with no trace of plastic breakage. The breakage surface appears in sharp edge. The breakage surface is uniform in color, with no trace of color layers. It belongs to acute damage situations.
How can you tell if your gears are damaged?
Not really identified as damage. After initial use, the irregularity of the tooth surfaces is kept in good balance. Wear on tooth surface identified by checking tooth contact. The state of the tooth surface becomes smooth like a mirror as the asperity of the surface is removed gradually.
What causes scratches on a KHK mating gear?
Linear scratches run irregularly on the tooth surface in the slipping direction. Excessively worn over the lifetime of the product. Wear of the tooth root, occurred by interference between the corner of the gear and the tooth root of the mating gear.
Where to find the pinion mark on a cam drive gear?
The best place to use as a reference is the valley between the two teeth where the pinion alignment mark is located. Simply look at the outboard side of the drive gear and identify the pinion tooth alignment mark (use the “O” mark, which is for XL motors, not the “V” mark, which is for XB motors).
How do you change the gears on a cam?
We’re going to simply press the gears off of two different cams, swap places, and press them back on. The trick, though, is to get them back on in the correct rotational position. For that, we need to mark the drive gears, and we need to do it before we press them off.
How big do you move the punch mark on a cam drive?
So let’s say we’d like to advance the cams four degrees. Since each degree is .008″, we need to move the punch mark to the left about .032″ to achieve four degrees of advance. Think a spark plug gap, or try to make the measurement with a feeler gauge or a caliper.
Which is better advancing cam or retarding Cam?
Advancing cams tends to move the powerband down the rpm scale, and retarding the cams tends to move it up the rpm scale. There are a whole bunch of caveats to that, but they’re beyond the scope of the article. Basically, it’s up to you to evaluate the effect on your particular setup, the above general rules don’t always apply.