Motion Control Application – LM76’s FDA/USDA Compliant Linear Bearings

Linear Motion - LM76-Pat Logo


Linear Motion - Only Solutions - Cheese Packaging




E. Longmeadow, MA – Motion Control Application – What do you do when you’re linear actuator bearings are including cheese debris? Particularly when your cheese slicing system requires FDA/caustic washdown compliance and FDA inspectors are on site reviewing all process operations for included debris which can propagate harmful bacteria.




“THE” Application

  1. Repeated Impact with Dense, Malleable Product
  2. FDA Compliant Materials
  3. Caustic Washdown
  4. Self-Lubricating
  5. No Product Inclusion

“THE” Issues

Linear Motion - Only Solutions - LM76 Linear Bearing

Originally, our customer specified LM76’s standard stainless, FDA/PTFE linear bearings in their linear actuator. This bearing met all the fundamental requirements: FDA/Caustic Washdown compliance, self-lubricating and no catastrophic (mechanical) failure mode. Initially, we felt the standard running clearance between bearing ID and shaft (.001 overall, .0005” either side) would be sufficient to clear debris. Not so. Thus, we needed a seal that would be FDA compliant, have a low “K” or wear factor and low coefficient of friction so drive torque wouldn’t be negatively affected. Since standard industry nitrile and buna seals were never in contention, we had to design a “scraper seal” from scratch.






“THE” Solution

Linear Motion - Only Solutions - LM76 Stainless Steel & PTFE Bearing

John Tarbell (President and Internationally regarded Plain Bearing Expert) reviewed several materials and selected Ertalyte® PET-P because it met all criteria relative to FDA/Washdown compliancy, “K” (wear) factor, coefficient of friction, machinablilty and thermal expansion/contraction. The ETX seals were designed for a slight interference between bearing ID and shaft. In addition, a “spring area groove” was designed behind the scraper lip to allow for proper spring-flex action and to accommodate thermal expansion during operation. Lastly, undercuts were machined at both ends of the bearing shell to anchor the snap-in ETX scraper seals. Since the scraper lips are zero-clearance on the shaft, the interference fit prevents cheese residue from migrating beneath the seal as it scrapes the shaft surface.

Linear Motion - Only Solutions - LM76 Linear Bearings - Wire drawings

Linear Motion - Only Solutions - Comp Drawing


Founded in 1976, LM76 has been a leading designer/manufacturer of motion control linear bearings, slides and linear motion systems. LM76 is renowned for its industry leading Minuteman Teflon® Composite linear bearings. LM76 is a leading supplier of precision linear shafting: RC60, 300 Series Stainless Steel, and ceramic-coated aluminum shafting. LM76 also offers several FDA/USDA compliant linear bearings and slides for the food processing, pharmaceutical, medical, and packaging industries.

For additional information contact Mike Quinn at: LM76, 140 Industrial Dr., E. Longmeadow, MA 01028; Telephone: 413-525-4166, Fax: 413-525-3735 or E-Mail: or visit the website at

Linear Bearings – Which Type is Right for Your Application?



Compare linear bearing types and ask for a “Squadron Patch” or Poster.





Requires Lubrication



High Loads



Rapid Oscillation



High Acel/Decel









Special Configurations



FDA Compliant



Chemically Inert



Catastrophic Failure Mode



Groove Shafting ( Brinelling)



Vacuum Rated


Yes (400F)

High Temp

No (180F)


Linear + Rotary


Yes (100 million linear feet)

Life Tested

Yes (2 million linear inches)

.04 – .08 Coefficient of Friction .010 – .001

Poor Self-Alignment/Compliant Very Good

At first glance, Black Racer linear bearings wipe the floor with linear ball bearings. However, linear ball bearings provide the lowest coefficient of friction for mechanical bearings – only surpassed by air bearings. Linear ball bearings are more compliant than sleeve bearings, thus they are more forgiving in applications where shaft parallelism is not exact. Linear ball bearings offer more self-alignment capability than sleeve bearings. Although Black Racer bearings are direct drop-in re­placements for inch linear ball bearings, you should call LM76 to ensure your application is a good candidate. For more information call Mike Quinn: 1-800-513-3163 or email:




Motion Control – Roller Drives Controlled by JVL MAC Motors!

Motion Control Application – The world’s largest manufacturer of motorised roller drives is now ready with the first servo-motor controlled roller drive in the world.

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Birkerød, Denmark and Morrow, OH (USA) -Motion Control – JVL Industri Elektronik and Interroll have announced that in cooperation they have developed a completely new servo-motor controlled roller drive based on JVL’s unique integrated MAC motor. The new development arose from Interroll customers’ increased requirements for roller drives that offered more precise and preferably dynamic control facilities. Interroll had met these requirements using frequency converters and, in many cases, through the use of new vector-based models, but many applications presented additional demands on other factors such as positioning, which required the use of an external encoder. Approximately 2 years ago, Interroll came up with the idea of replacing its AC motor with the JVL MAC servo-motor, not least because:

  • The price of servo motors had fallen
  • The MAC motor’s compact design meant that it could be used to replace the normal AC-motor with relatively few adjustments
  • Two acknowledged and well-proven components would be combined:
  • JVL’s MAC motor with its 5 year proven track record
  • Interroll’s 20 years of extensive experience with the design and manufacture of mechanical units

In only 3 months, JVL produced the first servo roller drive in the world, based on well tried and tested components and technology. Interroll now had a price and performance competitive alternative to the ”old” three-component solution.

The intention was to present the new innovative design to existing Interroll customers in order to “test” the concept in the real world. And the response was very positive, so after a final market analysis Interroll decided in January 2004 to beta-test IntelliDrive® (as the new addition to the family had been christened).

  • The feedback from the market was very positive:
  • Quick and easy to install
  • Very user-friendly software
  • Competitive compared to traditional solutions
  • Greatest interest in applications for packaging machines and food processing.

Based on the positive results, Interrroll decided to introduce IntelliDrive® on the market. The first IntelliDrive® units appeared in August 2004, and the first application has already been commissioned and is operational.

Interroll’s expectations of the new product are great, despite the fact that in many ways it breaks with the company’s traditional core expertise in mechanical design and construction.

Motion Control MAC Moter used in Interroll Roller Driver is from JVL

(Left)The drive unit with built-in MAC motor and gear

Experience has shown that the new technologies are very applicable to specialised machinery in particular, a fact that is currently being demonstrated with the incorporation of IntelliDrive® into numerous customers’ developments of new and performance improved machinery for various purposes. These include:

  • Automatic sowing machines – indexing
  • Simpler and cheaper
  • Meat slicing machinery – positioning
  • Greater accuracy — higher yield for end-user
  • Dynamic weighing machines — velocity and torque
  • Greater accuracy and more compact design
  • Machinery for folding bed linen — torque and positioning
  • Compact and cheaper

One new development project that merits special mention is a customer’s development of a video-controlled robot, in which the key factors are simplification and cost reduction.

The opportunities afforded by the innovative new product are numerous, and already now Interroll sees potential for the use of JVL’s larger MAC motors in Interroll’s large roller drives. The decision to implement such solutions will depend on market success of the small IntelliDrive®, which so far looks very promising.

For more information about Integrated AC Servo Motors MAC050-141 – Click here!

Motion Control - Interroll Roller Driver is from JVL

To go to Interroll homepage – Click here!

About JVL – JVL is recognized as a leader for its development of modern, compact stepper motor drivers and VAC and VDC controllers as well as MAC motor series of integrated VAC servo motors (up to 3000W), and the QuickStep integrated stepper motors (up to 25Nm). Both the servo motor and stepper motor series includes the controller and encoder integrated into one compact unit.

JVL with more than 20 years of motion control experience enjoys a reputation for the development of specialized, customized equipment. They work together with their customers and representatives to find an economic, yet technically advanced solution to complicated control applications.

JVL’s wide selection of quality products for motion control components include: Integrated VAC Servo motors, Integrated Stepper motors, VAC Servo motor controllers, VDC Servo motor controllers, Motor drivers (Stepper, VAC and VDC), Keyboard/Display (Input/Output- and Counter Modules).


JVL USA • Att: Mike Fisher • National Sales Manager
8610 Morrow-Rossburg Rd • Morrow • OH 45152-9444
E-mail: mfisher@jvlusa.com3/877-3134 •Tel.: 513/282-0888 (Tech Support Line) •
Fax: 513/877-2471•
For Additional Information about Mike Fisher and JVL USA – Click Here


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Further information can be obtained from:

JVL Industri Elektronik A/S

Blorkken 42, DK 3460, Birkerød, Denmark

E-mail: Tel.: +45 4582 4440 ; Fax.: +45 4582 5550 ;

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