Archive for January, 2014

Classical V Belts Dimensions in Agriculture

Friday, January 31st, 2014

More than 66 different dimensions, sizes, and types of belts are utilized in the agriculture equipment industry. Such belts are being used in tractors, balers, and snow blowers, among others.

V Belts can be found in fan belts, timing belts, drive belts for mowers, as well as general pulley driven devices found in combines, mowers, balers, and other agricultural equipment.

To be able to change a V belt that has any cut or damage, it should be identified beforehand. How to identify a belt? Of course you can look at the V belt part number written on it. But, when that’s not possible you need other means.

The basic V belt has a trapezoidal cross section, with equal sides, and different lengths at the top and bottom. There are 5 common belt types (called Classical V Belt), defined as A, B, C, D and E. The five principal dimensions of a V Belt are the top width, pitch width, height, angle, and effective circumference.

  • The A model has a top width of 13mm (1/2 inch) and a height of 8 mm (5/16th of an inch).
  • The B model has a top width of 17mm (21/32nd of an inch) and a height of 11 mm (13/32nd of an inch).
  • The C model has a top width of 22 mm (7/8th of an inch) and a height of 14 mm (17/32nd of an inch).
  • The D model has a top width of 32 mm (1 1/4th of an inch) and a height of 19 mm (3/4 of an inch).
  • The E model has a top width of 38 mm (1 1/2th of an inch) and a height of 23 mm (29/32nd of an inch). All classical belts have angles of 40 degrees.

Its length is another major variant of this component. You can measure the standard outside and inside circumference of the belt, but for measuring and part number identification purposes, this is not the effective circumference.

Classical industrial belts are specified in terms of pitch length.  The pitch length is normally the length at the belt pitch line. This line is generally located at the neutral axis near the cord line and varies with cross section and construction.

The effective circumference, or effective length, is the outside diameter at a specified tension.  Such circumference is measured where the groove top width is a dimension as specified by RMA, ASAE or SAE standards.

Some manufacturers and users choose the pitch length to identify belts, but the majority opt for the effective circumference of the belt for identification purposes.

Lubrication of Bearings

Friday, January 24th, 2014

When a bearing is required to run under demanding conditions, the choice of lubricant is vital. Lubrication has a big impact on lifespan, torque, speed, noise, grease migration out gassing, temperature, and rust prevention of the bearing.

Proper lubrication paves the way for smooth running of equipment, with only mild wear, and without unnecessary stresses at bearings. When lubrication fails, metal or other components tend to rub destructively over one another, leading to destructive damage, heat, and failure.

10 Safety Checks to Do on Your Snowmobile Trailer

Friday, January 17th, 2014

You know what happens in winter. Before you know it, the ground is all covered with white stuff. We’re always looking forward to getting our trail pass and make our mark in the fresh snow. The prepping always involves making sure that we will be able to safely transport our sleds to and from our beloved trail sans mishaps along the way.

Here are 10 safety checks to do before hitting the road:

  1. Ensure that the vehicle you use to tow the snowmobile trailer is equipped properly.
  2. You must look into the GVWR (Gross Vehicle Weight Rating) regardless of whether you own a towing vehicle or not. This is the weight of your trailer when fully loaded.
  3. You should know how to properly hitch your trailer. A reliable trailer dealership will teach you how it is properly done.
  4. Every light must be thoroughly checked, the vehicle’s and the trailer’s alike. By doing so, people driving around you will easily see your vehicle and snowmobile trailer.
  5. Meticulously look into the braking systems and buy a breakaway switch kit that will aid in stopping the trailer should it get separated from your towing vehicle while you’re on the road.
  6. See to it that the tires on your trailer are properly filled with air and that they are the correct tire size. Also see to it that bolts and lug nuts are tight and in place.
  7. As you load your trailer, take into consideration the weight distribution. If you overload any given side, it can affect steering and control.
  8. Secure your snowmobile on tie-down tracks and make sure that D-rings or ski bars hold the sleds safely in place.
  9. Make a safety kit that has flares, road hazard sides, wheel chocks, jacks as well as spare tires.
  10. Check that the mirrors from your towing vehicle has visual clearance around the trailer before traveling.

Q&A: Can a wrong grade lubricant cause bearing failure?

Friday, January 10th, 2014

Q: Can a wrong grade lubricant cause bearing failure?

A: Yes, using the wrong grade lubricant instead of the manufacturer’s recommended grade could bring about shortened bearing life and/or a risk of serious bodily harm. Making use of the proper grade and type of lubricant is a significant factor in bearing performance. Keep in mind to follow original equipment manufacturers’ recommendations at all times when making lubrication specifications.

V-Belt Matching

Friday, January 3rd, 2014

For the most part, V-belt drives make use of multiple belts in order to transmit power. In such applications, matched belts must be used to guarantee even load distribution.

The acceptable length deviations for a “matched” set of belts (per RMA Standards IP-20 and IP-22) are the following:

Belt Length – Matching Limit

Up to 63” – 0.15”

63 to 150” – 0.30”

151 to 250” – 0.45”

251 to 375” – 0.60”

376 to 500” – 0.75

Over 500” – 0.90”

The majority of Gates V-belts are made within the above match tolerances, paving the way for stocked belts to run as matched sets. But there will always be exceptions to the match tolerances that are listed above. V-belts with aramid tensile cords don’t stretch very much, calling for a match tolerance tighter than the RMA standard. V-belts with aramid cords must be matched by opting for belts that have a single punch code.

Gates belts that are made within the RMA match tolerances are identified in the Gates Industrial Power Transmission Systems catalog by the designation “V80”. Belt sizes that are not included in the V80 match system with standard polyester tensile cords must be special ordered as matched sets.

If belts don’t have the same length and specification, the shortest belt will be marrying the load since it tensions in the sheave first and the remaining belts are just going along for the ride.

Length can differ widely depending on the manufacturers.