Custom Quality Cast, Sintered, & Self-lubricating Bearings
Bearing Types
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Materials (Bronze Alloys)
Below are the most common alloys – call to inquire about other materials.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Processes
|
|
|
|
|
|
|
|
|
|
|
|
Oil & Grease Grooving
Below are the most common groove styles and reference names:
| CIRCULAR | STRAIGHT | SINGLE LOOP | DOUBLE LOOP |
| Buckeye Circular | Buckeye Straight | Buckeye A | Buckeye B |
| Bunting Circular | Bunting Straight | Bunting 1 | Bunting 2 |
| Johnson H | Johnson G | Johnson A | Johnson D |
| Randall H | Randall G | Randall A | Randall D |
| Boston Gear II | Boston Gear I | Boston Gear III | Boston Gear VI |
 |  |  |  |
| STRAIGHT & CIRCULAR | FIGURE 8 | DOUBLE FIGURE 8 | STYLE 11 |
| Buckeye C | Buckeye D | Buckeye E | Buckeye F |
| Bunting 3 | Bunting 4 | Bunting 5 | Bunting 11 |
| Johnson C | Johnson B | Johnson E | Johnson F |
| Randall Str. & Cir | Randall B | Randall E | Randall F |
| Boston Gear V | Boston Gear IV | Boston Gear VII | Boston Gear VIII |
 |  |  |  |
Groove selection can be influenced by many things such as operating temperature, type of lubricant, supplemental lubrication feed system, load etc. Any of the standard bearings listed in our catalog can be grooved, graphited, drilled or re-machined in many ways to handle of variety of requirements.
Unless otherwise specified, the width & depth of the groove will be proportional to the wall thickness and the size of the bearing, and contained within the bearing. Special designs or a combination of standard styles illustrated below may be furnished if desired. We recommend a V-shaped groove whenever the design permits, as it allows full flow of the lubricant across the bearing service.
Boundary Lubrication is where none of the load is supported by the lubricant. Bearings only periodically lubricated will at some time operate under these conditions. Speeds which are 10 s.f.m. or less will cause boundary lubrication: Suggested grooving: Double Loop or Double Figure 8.
Mixed Film Lubrication is where the load is partially supported by the lubrication. Speeds from 10 to 25 s.f.m. will induce this condition. Most cast bronze bearings are in this category. Suggested grooving: Straight – good for long bearings. The groove should be located in the unloaded area of the bearing. Circular – used when the location of load varies and a pressure fed lubricant system is present. Straight & Circular – applied in cases where the direction of the load varies and the lubricant is not pressure fed.
Full Film Lubrication is where the load is separated from the bearing by a film of lubricant. A minimum speed of 25 s.f.m. will generally be needed. The same type of grooving used in mixed film will work in the full film application.
Graphiting – Graphite lubrication on the I.D. face of the bearing will enable you to obtain long bearing life both at high operating temperatures, and in applications lacking a supplemental lubrication. Graphiting is accomplished by grooving the I.D. and then pressing graphite into the cavities under extremely high pressure. A film of lubricant is transferred to the shaft as it starts to turn.
Any of our standard stock sleeve type bronze bearings, as well as custom bearings, are adaptable to grooving and graphiting. Many different graphiting styles are available, including plug type. The depth and width of graphite grooving depends upon the wall thickness, bearing diameter and other factors than may vary with an individual application. When using a graphite lubrication bearing, an allowance of .001″ to .002″ additional clearance is suggested. This extra clearance can be obtained by ordering the bearing with a larger I.D. or by reaming.
| LOOP | MULTIPLE LOOP | MULTIPLE CIRCULAR |
| (3 OR 4) | ||
 |  |  |
| GROOVE TYPE | GROOVE TYPE | GROOVE TYPE |
| Buckeye K | Buckeye L | Buckeye H |
| Bunting 5G | Bunting 7A | Bunting 9 |
| Johnson M | Johnson N | Johnson L |
| Randall RG5 | Randall RG6 | Randall RG7 |
| MULTIPLE LOOP | SERRATED | PLUG TYPE |
| (7 or 8) | ||
 |  |  |
| GROOVE TYPE | GROOVE TYPE | GROOVE TYPE |
| Buckeye G | Buckeye S | Buckeye J |
| Bunting 10 | Bunting 7 | Bunting 8 |
| Johnson 0 | Johnson KR | Johnson P |
| Randall 2-RG5 | Randall RG8 |