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“Cheap” Linear Guide Systems Move 1200 Lb. Loads At Speeds Of 30 Feet Per-Second!

Linear Motion -LM76-TopShelf-Cheap

Linear Guide Systems Move 1200 Lb. Loads At Speeds Of 30 Feet Per-Second!

E. Longmeadow, MA – Two series of high speed, low cost, compact linear guide systems called, “Speed Guides,TM” have been introduced by LM76. The Speed Demon OSG type and Speed Demon SG type linear guide systems are designed for speeds up to 10 m/sec. (32.8 ft/sec.), accelerations to 50 m/sec.2 and loads up to 5600 N. (1259 lbs.). These quiet, low profile guide systems are ideal for: High speed assembly and sorting operations, pick and place robots, industrial, office, and packaging machines, vacuum applications, and medical equipment (including patient care devices).

The OSG type linear guide systems are available in five rail & block sizes. Each OSG rail features pre drilled mounting holes, dual RC60 steel shafting in lengths up to 4 Meters (13 ft.), and can be ordered cut to size. Each OSG block features 4 dual contact roller bearings with two bearings on eccentric mounts for easy clearance adjustments. Running straightness is just +/- 0.02mm (+/- .0008 in.) regardless of system length.

The SG type linear guide systems are available in seven rail sizes and 19 block designs in seven sizes to fit a wide range of applications. Each SG rail features pre drilled mounting holes, dual RC60 steel shafting in lengths up to 4 Meters (13 ft.), and can be ordered cut to size. SG blocks feature three to five dual contact roller bearings with one, two, or three bearings on eccentric mounts for easy clearance adjustments. Running straightness is just +/- 0.015mm (+/- .0006 in.) regardless of system length.

The OSG and SG type Speed Demon linear guide systems are ideal for use in X, Y or Z axes. Integral felt wipers, high angular dual contact bearings, and corrosion resistant materials permit installation in a broad range of adverse environments. Shafting options include RC60, 440C, and Chrome Plating. For easy integration into a new or existing application CAD drawings are available on the LM76 Website http://www.lm76.com.

Founded in 1976, LM76 has been a leading designer/manufacturer of 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: 413-525-4166413-525-4166, Fax: 413-525-3735 or E-Mail: mquinn@lm76.com or visit the Web site at http://www.lm76.com

 

LM76′s FDA/USDA Compliant Linear Bearings Are – “THE” Only Solution!

Linear Motion - LM76-Pat Logo

 

Linear Motion - Only Solutions - Cheese Packaging

 

 

 

E. Longmeadow, MA – — 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 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: 413-525-4166413-525-4166, Fax: 413-525-3735 or E-Mail: mquinn@lm76.com or visit the website at http://www.lm76.com

Linear Bearings – Which Type is Right for Your Application?

 

LM76-Difference-01

 

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

 

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Yes

Requires Lubrication

Yes

Yes

High Loads

No

Yes

Rapid Oscillation

No

Yes

High Acel/Decel

No

Yes

Shock/Vibration

No

Yes

Contamination

No

Yes

Special Configurations

No

Yes

FDA Compliant

No

Yes

Chemically Inert

No

No

Catastrophic Failure Mode

Yes

No

Groove Shafting ( Brinelling)

Yes

Yes

Vacuum Rated

No

Yes (400F)

High Temp

No (180F)

Yes

Linear + Rotary

No

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: mquinn@LM76.com

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Application Story – FDA/Washdown System Excels with Special Linear Motion Shaft Assembly from LM76!

Linear Motion - Application Story - Dairy

LM76

E. Longmeadow, MA – — Linear Motion – Application Story – Dairy machinery manufacturers are under intense scrutiny by FDA inspectors when it comes to FDA material and caustic washdown compliance. Recently, LM76 was called by a large US dairy packaging company to review a problematic portion of their filling line. After each shift, the filling line is washed-down, has a caustic foaming agent applied to kill bacteria and then is final rinsed. The caustic foaming agent was destroying – literally eating – the aluminum shaft supports while shafting exhibited pitting and showed signs of minor corrosion. Additionally, there were areas where product got trapped and these locations were havens for bacterial growth. Because this system was in-place and our customer was the end-user, LM76 engineers had to use direct drop-in replacement com¬ponents. What to do?

First, we decided to forgo the original bearing system that used 440c stainless linear ball bearings running on 440c hardened shafting. After reviewing loads and speeds we determined that our stainless FDA Compliant, self-lubricating linear bearings would do the job. By choosing sliding friction bearings, we were able to switch the less corrosion resistant 440c with a better 316 stainless shafting while eliminating greasing of the linear ball bearings. To increase shaft hardness, corrosion resistance and decrease “Stick/Slip” of the sliding bearings, we applied an Armoloy coating. This coating raises the shaft hardness from Rb25 to Rc78. Additionally, both the 316 stainless and the coating are FDA compliant. Along with enhanced hardness, corrosion resistance and FDA compliance, this coating has an inherent lubricity that aids in lowering “Stick/Slip”. “Stick/Slip” is a condition inherent in sliding linear bear¬ings. It takes a greater force to move a sleeve bearing linear system from static position than it does to maintain dynamic motion. Thus any assistance in lowering this value is meaningful. Now that we had the correct shafting, we turned our attention to the aluminum shaft support Here we made 2 design decisions:

1. We applied a ceramic coating to the aluminum “T” support. This coating is FDA compliant, is file hard (resists scratching) and is highly corrosion resistant.

2. To enhance system flushing to remove trapped product that could produce harmful bacteria, we segmented the support system to allow for proper evacuation of all washdown solutions and debris.

Linear Motion - Application Story - Dairy

At LM76, we don’t offer a standard catalog product for your special application. We study and isolate the issues, then we design a proper solution. If you have a special application that requires a special touch, call Mike Quinn at LM76 1-800-513-31631-800-513-3163 or E-Mail: mquinn@lm76.com

Founded in 1976, LM76 has been a leading designer/manufacturer of 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.

Linear Motion - Application Story - Dairy

For additional information on any of LM76′s tandard or custom engineered components contact Mike Quinn at: LM76, 140 Industrial Dr., E. Longmeadow, MA 01028; Telephone: 413-525-4166413-525-4166, Fax: 413-525-3735 or E-Mail: mquinn@lm76.com or visit the website at http://www.lm76.com

Linear Bearing Engineers Design Camera Sliders for the Pro and Beginner!

Designed by Linear Bearing Engineers Camera Sliders for the Beginner and the PRO

PRODUCTS | CONTACT US | NEWS | VIDEOS | Designer Spotlight | Artist Spotlight | NEW SLIDER

The difference between rolling and sliding friction in camera sliders. Mike Quinn

Take a quarter and roll it on its edge across a table – goes forever and moves quickly. Now take that quarter and lay it on its side and push it…that’s the difference. Sleeve bushings inherently have much more surface area under load. Simply put, they have big feet.  Conversely, a ball and roller have much smaller feet ensuring them a meaningfully lower co-efficient of friction. A ball offers point contact loading and loosely reside in 4 rows within a steel or plastic shell:

ball

These balls literally kick each other along as the balls roll down the shaft. Because they have so little contact area, the coefficient of friction is as low as .001 – they roll easily and smoothly. The drawbacks in a camera slider are readily recognizable:

1. Resonance – noise – ZING! ZING! ( Metal on metal contact and because they push each other from load to preloads, they create resonance, noise and vibration.
2. They are made from steel and can rust – they require lubrication.

Rollers have internal ball or needle bearings at their core, between the inner and outer race. They are separated in a retainer, unlike linear ball bushings which run loose in their track ways.

roller roller

These are sealed and lubricated for life. They have more contact area but the coefficient of friction remains low approximately .003 – not as low as the ball – but very close. These rollers come in dual angular contact ( gothic arch ) or V geometries. They are very smooth, take high loads/moment loads ( overhanging loads )and provide great stiffness. They are however steel and they run on steel shafting or V groove rails. They can produce noise and are vulnerable to the elements.

Plastic Sleeve Bearings are truly all weather and can run very smoothly and tolerate debris. However, the real world coefficient of friction is around .2 – factors higher than ball and rollers. They are also prone to a phenomena called edge loading. This effect can cause the carriage plate ( slider ) to ratchet or get sticky due the bearings digging into the shaft. This is particularly troublesome when you attempt to slide the carriage plate with top heavy rigs like a DSLR with a Red Rock system. You will need two hands.

There is an answer…Camera Motions new ” Silent Slider “

Why? Because we offer a solid, 1 piece precision machined aluminum carriage block that is black anodized. Not an extrusion that is cheap and has varying tolerances one lot to another. We have selected the best industry urethane cam followers with needle bearing rollers – tight and true. Moreover, the rollers damp any noise or vibration yet hold a 25 pound load. Smooth, quiet and solid. The Silent Slider is a product of linear motion engineering – pure and simple. It was was designed to run on a 16mm twin extruded rail which is ubiquitous in the the camera slider industry. Keep your rail and tripod shoe and move to the future – The” Silent Slider!”

Let engineering win – not salesmen. Only $ 230.00. Call Mike Quinn @ 1-800-698-5820.

Linear Motion – Defender Rails Go Quiet!

Linear Motion – High Load X & Z axis System Can Be “Washed Down!”