Machining and Installation

Machining Onsite

Large Diameter Bearing

CIP Composites are readily machinable by conventional machining techniques. As a general guide they may be treated as they would for soft metals such as aluminum or bronze, but machined (dry) without coolant. CIP materials are non-toxic, although it is advisable to use adequate dust extraction when machining.

For turning, tungsten carbide or diamond tipped tools should be used to obtain a fine finish. High speed steel tools can be used for machining where accuracy below 0.005 in. (0.12 mm) is not required and for small quantity production.

Installation Methods

CIP Composite bearings can be designed for freeze-fit, press-fit, mechanically fasten, or bonding installation.

Bearings do not become brittle during the freezing process. Liquid nitrogen is the most efficient method; in some cases dry ice or refrigeration may be used. Once bearing is frozen, and outer diameter is smaller than housing, block or hold the bearing in place. As the bearing returns to ambient temperature it will increase in size and the proper interference with the housing will be obtained.

Freeze Fitting CIP Bearings

Bearings should be fully supported over their loaded area, with uniform interference fit. A suitable lead-in chamfer should be provided in the housing and on the bearing diameter to assure proper start. The amount of force can be suggested to make sure there is adequate power available.

Press Fitting CIP Composites

Mechanically Fasten
Shoulders, bolt on rings, other rings, or keepers can be used to prevent the bearing from moving over time. Flat components such as wear pads can be retained by countersunk screws or metal inserts and located by keeper plates where high lateral or shearing loads are anticipated.

CIP Composites inherently bond with adhesives exceptionally well. Bearings can be designed for glue-in installation with a minimum clearance of 0.005 in. (0.127 mm). During installation, bearings should be retained on top and bottom. Wear pads can be retained with adhesives to many metallic surfaces. We can recommend adhesives.

Bonding with Adhesive

Counter/Mating Surface

The counter surface finish of the mating operating component has a major effect on the performance of the composite. Surface finish should ideally be 16 – 32 RMS (0.4 – 0.7 μm) RA minimum and HRB 80. Suitable materials for shafts, thrust faces, etc., would be hardened steels or stainless. All mating surfaces should be free from cutting edges and lubrication grooves or holes.

Mating Surface

External Lubrication

CIP Composites can be used with external lubricants if desired. We can custom design bearings and wear pads with lubrication grooves for water, grease or oil.