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The Chicago Pneumatic Air Scribe is a bit noisy and also produces quite a bit of dust and grit as it disintegrates sears the rock matrix, making both a dust mask and ear protectors necessary when the unit is in use outside a dust-collecting chamber. A silencer that fits snugly around the hand-held unit is not available from the manufacturers but can easily be made with a few common household tools. By cutting a piece of metal tubing to the length of the air scribe''s handpiece and notching one end so that it can be crimped to conform to the tapered bit end of the tool, a very simple noise insulator is produced. A foam rubber plug inserted in the bit end forms a snug fit. The only disadvantage to this noise protection is that the natural stream of air emitted from the tool end is blocked, and dust is not readily blown off the working surface. Likely some innovative tinkerer will soon solve this problem. Simple ear plugs or muffs are adequate to help provide hearing protection. Another minor problem with the air scribes is the absolute necessity of lubrication. Producing an effective reciprocal motion to any tool involves very complex valves and close-fitting parts. This is especially true when the tool is designed to be very small. Depending on the duration of use, an air scribe must be oiled from once to several times per day. This involves shutting down the system, dismantling the air supply, and inserting several drops of high-quality air-tool oil. In-line oiling systems are available that can make this process far simpler. Additionally, regularly flushing the unit with oil will eliminate microscopic particles of metal and grit and will greatly extend the life of your air scribe. Sandblasting

This exercise was conducted to improve performance of an existing open center system. Reduced horsepower consumption also resulted in the elimination of the oil cooler. Correct sizing of components is essential for maximizing system efficiency. Simply evaluating the cost of each component will obscure the overall savings achieved by integrating a complete system.A significant benefit to this system versus pressure compensation is the simplicity. Compensators can misbehave. An open center valve has far fewer moving parts and rarely suffers front debris getting lodged in small opening. Anyone who has been in the position of analyzing a pressure compensated valve problem in the field can attest to the difficulty of determining what lawn combination of factors brought on rite problem. The fewer the variables the better. Princeton Delivery Systems, a leading North American manufacturer of material handling equipment, recently unveiled the latest generation in its line of Piggy Back track-mounted forklifts. The PB50 and PB65 incorporate a range of improvement from their predecessors and mark one of the first applications of Caterpillar''s new four-cylinder 3024 compact diesel engines.