Telescopic gauge

• Precision Measuring Tools • Precision Hand Tools • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Gage Blocks • • • • • • • • • • Surface Plates • • • • • • • • • • • • • • • • • The Starrett Telescoping Gage is used for determining the true size of holes, slots, and recesses up to 6" (150mm). The ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter. These tools must be slightly rocked in the hole being measured to ensure that the tool is on the proper diameter before it is locked and withdrawn. The final hole size is obtained by measuring over the gage contacts with a micrometer. SET, Includes 5, Nos. 229A/B/C/D/E in Case. • Precision Ground Radius on each gage provides two-point contact for maximum accuracy • Case • Handles can be individually ordered and/or ordered in larger sizes such as 8", 12" or longer • Features a handle, one rigid contact arm and one spring-tensioned telescoping contact arm • Ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter

Image Credit: wonkeedonkeetools.co.uk There are two styles of telescopic gauges. One type has two plunging telescopic rods. The other type only has one plunging rod, the second rod remains fixed. The telescopic rods are what measure the distance of the bore, with the help of a micrometer. The ends of the rod are the shape of a half ball, called the radius edge. It’s this shape that’s responsible for the telescopic gauge’s accuracy. How to use telescopic gauges Using the telescoping gauge is fairly easy. Although to obtain accurate measurements and to develop a good feel for the tool, a little bit of practice is required. Here’s a step-by-step process: 1. Collapse both the measuring heads by rotating the locking screw anticlockwise. 2. Place the gauge into the bore with one head held in place against the wall of the bore. Begin to loosen the screw, but not too much because the rods are spring loaded. 3.Proceed to tilt the gauge so the rods are slightly inclined and tighten the locking screw. 4. Whichever end you lifted a bit above horizontal, force it slowly downward through the bore. As you do this, wiggle the gauge back and forth. This will allow the gauge to find its smallest size on the spring. 5. You are now ready to measure with a calibrated micrometer, since there is no scale on the tool itself. Check out how machinist and YouTuber Adam Booth achieves accurate measurements using his non-traditional approach with a telescopic gauge. Are telescope gauges reliable? It’s...

Image Credit: wonkeedonkeetools.co.uk There are two styles of telescopic gauges. One type has two plunging telescopic rods. The other type only has one plunging rod, the second rod remains fixed. The telescopic rods are what measure the distance of the bore, with the help of a micrometer. The ends of the rod are the shape of a half ball, called the radius edge. It’s this shape that’s responsible for the telescopic gauge’s accuracy. How to use telescopic gauges Using the telescoping gauge is fairly easy. Although to obtain accurate measurements and to develop a good feel for the tool, a little bit of practice is required. Here’s a step-by-step process: 1. Collapse both the measuring heads by rotating the locking screw anticlockwise. 2. Place the gauge into the bore with one head held in place against the wall of the bore. Begin to loosen the screw, but not too much because the rods are spring loaded. 3.Proceed to tilt the gauge so the rods are slightly inclined and tighten the locking screw. 4. Whichever end you lifted a bit above horizontal, force it slowly downward through the bore. As you do this, wiggle the gauge back and forth. This will allow the gauge to find its smallest size on the spring. 5. You are now ready to measure with a calibrated micrometer, since there is no scale on the tool itself. Check out how machinist and YouTuber Adam Booth achieves accurate measurements using his non-traditional approach with a telescopic gauge. Are telescope gauges reliable? It’s...

• Precision Measuring Tools • Precision Hand Tools • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Gage Blocks • • • • • • • • • • Surface Plates • • • • • • • • • • • • • • • • • The Starrett Telescoping Gage is used for determining the true size of holes, slots, and recesses up to 6" (150mm). The ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter. These tools must be slightly rocked in the hole being measured to ensure that the tool is on the proper diameter before it is locked and withdrawn. The final hole size is obtained by measuring over the gage contacts with a micrometer. SET, Includes 5, Nos. 229A/B/C/D/E in Case. • Precision Ground Radius on each gage provides two-point contact for maximum accuracy • Case • Handles can be individually ordered and/or ordered in larger sizes such as 8", 12" or longer • Features a handle, one rigid contact arm and one spring-tensioned telescoping contact arm • Ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter

Image Credit: wonkeedonkeetools.co.uk There are two styles of telescopic gauges. One type has two plunging telescopic rods. The other type only has one plunging rod, the second rod remains fixed. The telescopic rods are what measure the distance of the bore, with the help of a micrometer. The ends of the rod are the shape of a half ball, called the radius edge. It’s this shape that’s responsible for the telescopic gauge’s accuracy. How to use telescopic gauges Using the telescoping gauge is fairly easy. Although to obtain accurate measurements and to develop a good feel for the tool, a little bit of practice is required. Here’s a step-by-step process: 1. Collapse both the measuring heads by rotating the locking screw anticlockwise. 2. Place the gauge into the bore with one head held in place against the wall of the bore. Begin to loosen the screw, but not too much because the rods are spring loaded. 3.Proceed to tilt the gauge so the rods are slightly inclined and tighten the locking screw. 4. Whichever end you lifted a bit above horizontal, force it slowly downward through the bore. As you do this, wiggle the gauge back and forth. This will allow the gauge to find its smallest size on the spring. 5. You are now ready to measure with a calibrated micrometer, since there is no scale on the tool itself. Check out how machinist and YouTuber Adam Booth achieves accurate measurements using his non-traditional approach with a telescopic gauge. Are telescope gauges reliable? It’s...

• Precision Measuring Tools • Precision Hand Tools • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Gage Blocks • • • • • • • • • • Surface Plates • • • • • • • • • • • • • • • • • The Starrett Telescoping Gage is used for determining the true size of holes, slots, and recesses up to 6" (150mm). The ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter. These tools must be slightly rocked in the hole being measured to ensure that the tool is on the proper diameter before it is locked and withdrawn. The final hole size is obtained by measuring over the gage contacts with a micrometer. SET, Includes 5, Nos. 229A/B/C/D/E in Case. • Precision Ground Radius on each gage provides two-point contact for maximum accuracy • Case • Handles can be individually ordered and/or ordered in larger sizes such as 8", 12" or longer • Features a handle, one rigid contact arm and one spring-tensioned telescoping contact arm • Ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter