JUNE 1997

Handy tool makes large-circumference O-ring seal installation easier

Problem: A large-circumference O-ring seal can be difficult to establish in its respective seal groove due to the tendency of it "walking out" of the groove as the O-ring is installed.

Solution: A quick remedy that keeps the O-ring seal in place during installation is to use one or two dial indicator magnetic base stands. Set them up over the O-ring and the groove to prevent the O-ring from lifting out of the groove. Most magnetic base stands have a vee-channel base, which helps ensure no damage is done to the O-ring.

The magnetic base stand is particularly effective if the installation happens to be in a vertical or overhead application.

Thanks and a Mr. O Problem Solver T-shirt go to Stan Borthwick, a mechanic at the County of Lethbridge #26 Public Works Repair Shop in Alberta.

Chain safety tips

Problem:  Injuries can easily occur when installing and using chain.

Solution: Comply with the following suggestion from Tsubaki Canada to avoid serious personal injury when working with chain.

1. Guards must be provided with all chain and sprocket installations in accordance with provisions of ANSI/ASME B15.1 - 1984, "Safety Standards for Mechanical Power Transmission Apparatus," and ANSI/ASME B20.1-1990, "Safety Standards for Conveyors and Related Equipment," or other applicable safety standards. When revisions of these standards are published, the updated edition applies.
2. Always lock out the power switch before installing, removing, lubricating or servicing a chain system.
3. When connecting or disconnecting chain:
   a. Eye protection is required. Wear safety glasses, protective clothing, gloves and safety shoes.
   b. Support the chain to prevent uncontrolled movement of chain and parts.
   c. Use of pressing equipment is recommended. Tools must be in good condition and correctly used.
   d. Determine correct direction for pin/rivet removal or insertion.

Extending bearing life

Problem: Two-thirds of bearings don't achieve their designed life

Solution: It is the maintenance of bearings that determines how well and how long a machine will run.

However, it is a fact that only a third of the bearings manufactured achieve their design life. The other two-thirds fail because of the way they are handled--incorrect installation, maintenance and lubrication.

This translates into increased machine downtime, higher costs, lower productivity, and greater work-related stress. As a result, an investment in maintenance training is money very well spent.

Thanks for this suggestion go to SKF Canada's Comtech BMI (Bearing Maintenance Institute).

Minor bolt repair

Problem: A nut/bolt has a damaged thread but you don't have a replacement on hand, nor a die or a tap.

Solution: This is a solution I have used on a few occasions. Grab some fine valve grinding compound and put some on the affected part. Run the nut/bolt up and down the threads.

The compound will help polish the threads, clear away debris and smooth out the damaged area. After polishing, wash the parts with solvent or other cleaner to remove the compound. (It also works on stainless steel bolts, although galling is still a worry.)

A tip of the Mr. O hard hat and a Mr. O Problem Solver T-shirt go to Kim Schumacher, Maintenance Supervisor, Golden Valley Processors Inc., Abbotsford, B.C.