END MEASURING RODS AND INSIDE MICROMETERS
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END MEASURING RODS AND INSIDE MICROMETERS - 1

83 The following pages show our varied line of precision end measuring rods and inside micrometers. The variations are fixed-range or adjustable-range micrometers and solid or tubular measuring rods. Unless otherwise noted under the individual tools, all have these features: Ÿ Balanced design for better feel and accurate measurement Ÿ All contact points are hardened and ground for better accuracy and long life Ÿ Satin chrome finish on all micrometer heads and reading surfaces that resist rust and also make for easy reading by providing a no-glare background for the sharp lines and figures Ÿ Hardened and stabilized spindle for accuracy and long life Ÿ Advanced sleeve design with staggered lines and distinct figures for precise and easy readability Ÿ Quick and easy adjustment Ÿ Starrett workmanship Ÿ Inside Micrometers Nos. 121, 124, 823 and 824 by design have a firmer rotation than regular micrometers. This is to limit the tendency of the micrometer head to rotate when withdrawn from the workpiece. Measuring Tips for Inside Measurements Whether to use a two-point or threepoint contact measuring tool is usually a matter of preference, but there are some differences. A two-point contact rod-type inside micrometer shown in this section is usually lighter, easier to handle, and more versatile over long ranges from approximately 6-107 (150-2700mm). Any two-point contact micrometer, regardless of range, can probe a hole better to find the geometry of that hole than a three-point contact. Most three-point contact tools have setting rings to insure accuracy. If you desire very close tolerance work with two-point contact inside micrometers, it is recommended that they be set to a ring gage or to an outside micrometer. A three-point contact micrometer shown in the Bore Gages section has an advantage in that it can be seated in position more quickly than a two-point contact tool. Usually these tools can also be read to a finer accuracy. The three-point tool will tell the maximum true diameter that can enter the hole a little faster than a two-point contact tool. Micrometer heads used in these tools are accurate to ±.0001 or 0.002mm, but overall accuracy on tools that add rods is dependent on good practice and technique. To insure accuracy, these practices should be followed: Ÿ Always make sure that there are no specks of dirt between the clamping surfaces of the rods and micrometer heads Ÿ Tighten all rods uniformly, not too tight, not too loose, but a fairly firm assembly Ÿ Assemble long sections vertically or, with support, horizontally Ÿ Because temperature can affect long rods used in these tools, they should be assembled in the same environment in which they will be used (For additional information, refer to the Bore Gage Section) END MEASURING RODS AND INSIDE MICROMETERS

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85 6-294 range Range with Move- Range with Micrometer ment of Grad- Combination Catalog EDP Head Screw uation Description Head* No. No. 6-78 2 .001 With (1) 4-6 Head, 11-83 128AZ 64375 (1) each 2, 4, 6, 8, 10, 12 Rods, (1) 12 Ext., (2) 24 Ext. 6-150 2 .001 With (1) 4-6 Head, 11-155 128BZ 64376 (1) each 2, 4, 6, 8, 10, 12 Rods, (1) 12 Ext., (5) 24 Ext. 6-294 2 .001 With (1) 4-6 Head, 11-299 128CZ 64377 (1) each 2, 4, 6, 8, 10, 12 Rods, (1) 12 Ext., (11) 24 Ext. 150-7350mm range 50mm 0.01 With (1) 100-150mm 150-1950 300-2100 128MAZ 64378 mm Head, (1) ea. 50, 100, mm 150, 200, 250, 300mm mm...

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86 Combination Head with Inside Micrometer No. 128 No. 128M The Starrett combination head for inside micrometers combines the precision of a dial indicator sensor and the linear accuracy of a micrometer. This combination of indicator and micrometer reduces the need for operator “feel” and provides faster readings with increased reliability. This head is interchangeable with the Starrett No. 128 Series end rods and extension combinations. For direct measurements, the dial indicator hand and the telltale hand must both register zero before reading the micrometer. As a comparator, the...

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87 Solid-Rod Inside Micrometers No. 124 Series Sets 2-32 No. 124M Series Sets 50-800mm These are the most popular inside micrometers because of their lightness, ease of use, and range. They are very useful for measuring inside diameters of cylinders and rings, measuring parallel surfaces, etc. The desired range is obtained by assembling rods and spacing collars to the micrometer head. Measuring rods are provided with a shoulder that is set accurately in the micrometer head and locked in position. When assembling rods to the A and B heads, the reading line on the micrometer head should be...

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All STARRETT catalogs and technical brochures

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