Recent research suggests that axial cracks on inner rings of high speed and intermediate speed bearings have become a leading cause of wind-turbine gearbox life issues. Technical papers on axial cracking in the past couple of years have focused on why this unusual bearing phenomenon is so prevalent in wind-turbine gearboxes.

We will run through the basics on how to measure bearing clearances and illustrate how to avoid mistakes. This will also require some critical measuring tools. Let’s just put this right out front—measuring bearing clearances cannot be accomplished with Plastigauge. Those little pieces of wax thread are not precision measurement devices and should not be used to define bearing clearances. We know this may hurt some people’s feelings, but setting bearing clearances is a process that’s too important to allow anything short of your best effort.

Isn’t it easier to source 608s than it is to source rods and cut them though? And then figuring out how to mount all this business?

When misalignment between shafts is more than a couple of degrees, or when a lot of torque needs to be transmitted through a wide range of angles, different kinds of couplings are called for. The canonical coupling in this category would probably be the universal joint, commonly used in automotive driveshafts. The familiar design of nested yokes joined by a cross or spider dates back far into history, with early examples showing up on Greek siege engines. The great English scientist Robert Hooke would later study these devices and characterize them mathematically. He realized that the output rotation was not necessarily constant at every angle and worked out how to fix this: a pair of joints at each end of a shaft rotated 90° axially. This arrangement can still be seen on conventional driveshafts for rear-wheel-drive vehicles, with a U-joint at the output of the transmission and another at the differential input.

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Global Needle Roller Bearings Market Forecast, 2019-2024: The industry research report studies the production, supply, sales, and the current status of the market in a profound manner. Furthermore, the report studies the production shares and market product sales, as well as the capacity, production capacity, sales, and revenue generation. Several other factors such as import/export status, demand, supply, gross margin, and industry chain structure have also been studied in the Global Needle Roller Bearings Market report.

Ah, the old Lovejoy coupling brings back memories as we used them on our rotary van vacuum pumps in the machine shop. Whenever the motor or pump were removed for servicing, you had to take great care in aligning the two shafts as that coupling did not like non-alignment at all. Ask me how I know, ha ha. If you were lucky, it just chewed up that rubber insert…if you were not lucky, one or more of those metal ears would let go creating a bit of a racket…and some shrapnel.

Regardless of which type of the four main types of needle roller bearing is selected for an application, engineers should consider a variety of factors before making their decision as early in the design phase as possible: the size/design envelope, type of load, load capacity, speed, temperature, misalignment, housing and shaft specifications, service life and lubrication requirements.

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So, while those taxes in New Jersey are objectively lower, cost of living – including the toll payments – mitigates the savings.

Most of us make a mortgage payment once a month, but if you split your usual monthly payment in two and make it every other week, you’ll end up paying extra into your mortgage, since you’ll make the equivalent of 13 monthly payments instead of just 12. Do this for a number of years leading into retirement, and you might knock out that pesky debt right in time.