Types and Purpose of Micrometer

Micrometers are made in various shapes and sizes, depending upon the purpose for which they are to be used. Some micrometers are graduated to measure in thousandths of an inch and others will measure as close as ten thousandths of an inch. Others are metric and measure in hundredths of a millimeter. There are two basic types of micrometers, with two distinct jobs. One is the outside micrometer, used to measure outside dimensions and the other is the inside micrometer, used to measure inside dimensions.

Outside micrometers. Outside micrometers are widely used in the automotive field to measure such components as crankshaft journals, piston pins, and valve stems to determine if they are within serviceability specifications. Most outside micrometers have a chrome plated or enameled steel frame to resist corrosion or tarnish.

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STABILIZER BAR

Jika hanya menggunakan spring yang lebih lunak untuk meningkatkan kenyamanan, maka bodi kendaraan akan cenderung miring sekali bila mobi berbelok , terkena gaya centrifugal. Pada kendaraan yang menggunakan suspensi independent gejala ini lebih besar. Oleh karena itulah untuk menguranginya ditambahkan stabilizer bar yang dipasang pada torsion bar. Disamping untuk memperkecil body roll ketika berbelok, juga berguna untuk meningkatkan traksi ban. Umumnya, pada suspensi depan, kedua ujung stabilizer dipasang pada lower suspension arm melalui rubber cushions dan linkage, kemudian bagian tengah stabilizer dikunci ke frame atau di dua titik lain melalui via rubber bushing, dan dapat berputar pada titik tersebut. Continue Reading →

Portable Metal Cutting Shears Purpose And Types

The portable metal cutting shears are lightweight, handheld power tools used to cut through sheet metal. These shears
are capable of continuous cutting along a straight or irregular line on a workpiece. Field and machine shop maintenance
personnel use the portable metal cutting shears for sheet metal trimming, auto body work, duct work, aircraft structural
repair, and cutting template patterns. These tools can be powered by an electric motor or air depending on the model selected.

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Grinding Safety Guidelines

Grinding Safety Guidelines

1. Special training is required before using the surface grinder. Ask shop staff to demonstrate proper use of this tool.

2. Abrasive wheel machinery shall not be operated without the appropriate guards in place.

3. Toolrests on bench or pedestal grinders shall be set no more than 1/16 inch from the wheel.

4. Never use a wheel that has been dropped or received a heavy blow, even though there may be no apparent damage. Such wheels may be weakened or unbalanced enough to fly apart on startup.

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Milling Machine Safety Guidelines

Milling Machine Safety Guidelines

1. Work must be clamped securely in a vise and vise clamped tightly to the table, or, work must be clamped securely to the table.

2. Do not take climb milling cuts on the shop’s mills unless instructed to do so.

3. Make sure cutter is rotating in the proper direction before cutting material.

4. Before running machine the spindle should be rotated by hand to make sure it is clear for cutting.

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Reading a Tire Size Codes

Until around 1978, tire sizes were indicated by alpha-numeric codes, such as D78-14. Then, with the adoption of the metric system, the codes changed dras­tically. Today, the new codes are much longer and provide more information. Tire dealers are required by law to have leaflets available that explain tire grades and ratings. The leaflets also tell you which metric codes replace the old alphanumeric designations.

For example, here’s the information provided by a common "P-metric" tire code, P205/75R-14:

Impact Wrench Use and Maintenance

The selection of an impact wrench should be based on the torque and speed required as well as the volume of work. An extra heavy duty tool is not required for a shop that changes four tires per day. It is required for high volume shops.  The heavy duty or extra heavy duty wrenches are recommended for truck wheel service.

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