Case Study: Need to Protect a Bearing? PTI Has You Covered.

PTI Engineers love a challenge. An OEM needed more protection for their bearings in a high contaminant environment. What did PTI do? Read on for a full run-through…

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Background: A major equipment manufacturer placed an order for 18 (9 expansion + 9 non-expansion) SRE-FB4-300 4-bolt flange mounted units. The units were destined for a land roller used in the Farming Industry to flatten land and compact the soil.

The Challenge: High levels of contaminants (dust, gravel, sand, etc.) are present in the application. And while the triple lip HNBR rubber seals that come standard are quite effective at keeping debris out, the customer wanted even more protection on both sides of the bearing to not only ensure longer bearing life, but to also help to prevent the seals from failing. However, a standard open end cover wouldn’t fit due to limited space at the back of the bearing closest to the roller.

The Solution: To protect the front of the bearing: PTI recommended a standard closed front cover. To protect the back of the bearing: PTI engineers designed a lower profile custom bolt-on back plate with a proprietary dust excluder seal. After sharing a 3D printed model of the back plate, which the customer promptly approved, PTI custom fabricated back plates for the application. PTI then drilled and tapped holes in the housings to accept both the front and back plate.

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The Result: PTI shipped out the modified units. After installing and running the equipment for several weeks, the customer has since placed multiple orders for several hundred additional units.

PTI’s Ability: PTI maintains a focus on ingenuity and a passion for enabling our customers to do more. It isn’t just what we do – it’s who we are.

Click here to view the PDF of this case study. Do you need help with creating new or improving on existing equipment? Contact us to find out how our engineers can help.

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About PTI: Upon opening in 1994, PTI has specialized in serving the growing niche market of Metric products. As demand has increased over the years, so has our product offering. Today, our customers enjoy a huge offering of both Metric and Inch-based products for the Industrial Power Transmission Industry.

Want to learn more about PTI? Click here to view our company overview video. View our products, other case studies, videos and more at www.ptintl.com.

Mounting Methods (Part 4 of 4): Tapered Adapter Sleeve

(This is the fourth and final installment of a four-part series examining the Four Shaft Attachment Methods for Mounted Ball Bearings…)

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PTI offers all four (4) shaft locking mechanisms for mounted (aka “housed”) ball bearings:

  1. Setscrew Locking
  2. Eccentric Locking Collar
  3. Concentric Clamp Collar
  4. Tapered Adapter Sleeve

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Let’s examine the fourth option: PTI GSH and UK series mounted ball bearings have a tapered bore and are secured to the shaft using a tapered adapter assembly. GSH and UK series tapered adapter assemblies consist of a tapered adapter sleeve, a lock washer and a lock nut. As the adapter is tightened using a spanner wrench, the adapter is drawn through the bearing and tightened to the shaft. Because the contact of the bearing is evenly distributed around the shaft, it provides the most concentric/ideal fit. Read on to learn more…

KEY FEATURES OF THE TAPERED ADAPTER SLEEVE: 

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  • Easy to Install
  • Concentric Grip to the Shaft
  • Provides a More Balanced Fit, Ideal for Medium to High Speeds

*Note: This bearing has the highest purchase price and will take the longest to install, but allows for minimal shaft damage and highest possible speeds with the least amount of vibration.

HOW TO INSTALL THE TAPERED ADAPTER MOUNTED BALL BEARING:
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  • Slide the assembly onto the shaft
  • Hold-down bolts for adapter mounted units should be tightened after the bearing is locked to the shaft
  • Snug locking nut by hand on each bearing noting the hold-down bolt hole position.
  • Once positioned into place, tighten the adjusting nut, drawing the adapter through the bearing clamping down onto the shaft
  • Check mounting bolt holes to insure adequate bolt clearance will remain after tightening.
  • Reposition the bearing if necessary.
  • Take care to ensure the locknut is not overtightened, as this can eliminate the bearing internal clearance, resulting in premature bearing failure
  • Tighten to the proper torque per Chart 3 below (from our Mounted Ball Bearing Installation Manual)
  • Re-check hold down bolts after 24 hours of operation to insure nothing has loosened. This check should become part of periodic maintenance including re-lube intervals

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DID YOU KNOW?

  • When tightening, the axial movement of the bearing will be less than 1/32” if starting from a snug position
  • Flange Bearings may require a shim behind the flange if a gap remains after mounting to avoid bearing pre-load.
  • L10 Life = the expected life of the bearing under normal conditions. Factors affecting bearing life include temperature, ambient conditions (presence of moisture, dust, dirt and other contaminants) and lubrication/maintenance practices.
  • PTI has the product, engineers, and experience to help you choose the ideal mounting method for your application.

ADDITIONAL RESOURCES:

We hope you enjoyed this four part series!
Click here to access Part One: Setscrew Locking, Part Two: The Eccentric Locking Collar, and Part Three: The Concentric Clamp Collar.

* * *

About PTI: Upon opening in 1994, PTI has specialized in serving the growing niche market of Metric products. As demand has increased over the years, so has our product offering. Today, our customers enjoy a huge offering of both Metric and Inch-based products for the Industrial Power Transmission Industry.

Want to learn more about PTI? Click here to view our company overview video. Check out other videos, information and more at www.ptintl.com.

Mounting Methods (Part 3 of 4): The Concentric Clamp Collar

(This is the third of a four-part series examining the Four Shaft Attachment Methods for Mounted Ball Bearings…)

concentric clamp collar image.jpg

PTI offers all four (4) shaft locking mechanisms for mounted (aka “housed”) ball bearings:

  1. Setscrew Locking
  2. Eccentric Locking Collar
  3. Concentric Clamp Collar
  4. Tapered Adapter Sleeve

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Let’s examine the third option: PTI’s “CL” Series Concentric Clamp Collar mounted bearings use a black oxide coated collar and a slotted inner ring. When tightened, “CL” series units are concentrically locked in place without marring the shaft, allowing for reduced vibration.

KEY FEATURES OF THE CONCENTRIC CLAMP COLLAR: 

concentric contact points.jpg

  • Easy to Install
  • Minimal Shaft Damage
  • Concentric Grip to the Shaft
  • Provides a More Balanced Effect Ideal for Medium to High Speeds

*Note: this mounting method is helpful to minimize vibration.

HOW TO INSTALL THE CONCENTRIC CLAMP COLLAR MOUNTED BALL BEARING:
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  • Once the bearing is on the shaft, tighten the collar using an Allen wrench or torque wrench (to ensure locking torque is ideal – see Chart 4 below from our Mounted Ball Bearing Installation Manual)
  • Re-check tightness of the collar after 24 hours of operation to insure nothing has loosened. This check should become part of periodic maintenance including re-lube intervals

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DID YOU KNOW?

  • Wrenches or drivers should be kept in good condition (flats not rounded over) to prevent damage to the set screws and to allow proper tightening.
  • Set screws can be replaced to maintain holding power without replacing the entire bearing.
  • L10 Life = the expected life of the bearing under normal conditions. Factors affecting bearing life include temperature, ambient conditions (presence of moisture, dust, dirt and other contaminants) and lubrication/maintenance practices.
  • PTI has the product, engineers, and experience to help you choose the ideal mounting method for your application.

ADDITIONAL RESOURCES:

Click here to access Part One: Setscrew Locking, Part Two: The Eccentric Locking Collar, and Part Four: The Tapered Adapter Sleeve.

* * *

About PTI: Upon opening in 1994, PTI has specialized in serving the growing niche market of Metric products. As demand has increased over the years, so has our product offering. Today, our customers enjoy a huge offering of both Metric and Inch-based products for the Industrial Power Transmission Industry.

Want to learn more about PTI? Click here to view our company overview video. Check out other videos, information and more at www.ptintl.com.