Telescoping hole gauges

Telescoping hole gauges DEFAULT

STARRETT 579D 1-1/4" - 2-1/8" Range, 1 No. of Pieces Telescoping Hole Gage

Best-in-class Telescoping Gauges to Measure up to 6-inch Holes and Bores. The top American manufacturer of tools and instruments, Starrett presents a whole collection of telescoping gauges and gauge sets with greater ranges to enable the precision measuring of inside dimensions of bores, recesses, etc. The models offered by the company are self-centering varieties with two telescoping arms. The measuring ranges of the different models are 5/16 - 1/2, 1/2 - 3/4, 3/4 - 1-1/4, 1-1/4 - 2-1/8, 2-1/8 - 3-1/2, and 3-1/2 - 6 inches. The 579-series telescoping gauges from Starrett have a glossy satin-chrome finish. The ends of both arms of the gauges are precision-ground and hardened to form a radius edge that provides you with excellent clearance even in the smallest hole. Before you lock the tool in the hole to be measured, you need to lightly shake it in the hole to make sure that the gauge is on the actual diameter of the hole. With this done, you are good to go to receive results with maximum accuracy. You can use these snap gauges for measuring the exact size of recesses, grooves, slots, holes, etc. of up to 6 inches. The constant spring tension offered by the gauges gives you uniform contact pressure while measuring. You can effortlessly lock the telescoping arms at any required setting. Moreover, the arms self-center automatically. Under the spring tension, the arms expand from the center to the precise size of the hole, and then, you can lock them there by the knurled knob. Then, you can measure the size with a micrometer or a caliper. Offered with two double-action plunging telescopic rods, these snap gauges are the best to help you with measuring to tenths and thousandths. You can order the telescoping gauges individually or in sets. The available gauge sets from Starrett are S229FZ (3 pieces), S579GZ (4 pieces), S229GZ (5 pieces), and S579HZ (6 pieces).

Benefits

  • Starrett 579-series snap gauges provide you with constant spring tension that helps you have a uniform contact pressure to measure bores error-free.
  • The radius edges of the self-centering telescoping arms offer excellent clearance even in the smallest hole.
  • Upon fixing the telescoping gauges properly in the required setting, you get precision measurements.
  • With the help of these snap gauges, you can measure to tenths and thousandths.

Applications

  • The 579 series of telescoping gauges and gauge sets from Starrett offer a greater measuring range for precision measuring.
  • You can use them to measure the inside dimensions of smaller recesses, such as camshaft bearings or connecting-rod bore bearings.
  • These snap gauges are ideal for measuring the true size of various grooves, slots, holes, bore, etc. of up to 6 inches.
  • Mechanical, construction, and maintenance industries can efficiently utilize these self-centering gauges.

Features

  • Starrett 579-series telescoping gauges come with two self-centering arms, and they have a glossy satin-chrome finish.
  • They are available in 5/16 - 1/2, 1/2 - 3/4, 3/4 - 1-1/4, 1-1/4 - 2-1/8, 2-1/8 - 3-1/2, and 3-1/2 - 6 inch measuring ranges.
  • The self-centering telescoping arms can be locked at any required setting.
  • The arm ends are precision-ground to form a radius edge.
  • These snap gauges are available both as individual products and in sets
  • The gauge sets are shipped in comfortable cases.
Sours: https://www.travers.com/product/starrett-579d-telescoping-hole-gage-57-065-563

Starrett Telescoping Bore Gauge Sets

Four Gauge Set

Six Gauge Set

Spring tension forces two telescoping steel contacts to expand inside the bore; turn the screw to lock the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.

Number
of Gauges
Measuring
Range
Max.Dp.
Measured
MaterialIncludesManufacturer
Model Number
 Each
45/16"-2 1/8"2"SteelOne gauge with 5/16"-1/2" measuring range
One gauge with 1/2"-3/4" measuring range
One gauge with 3/4"-1 1/4" measuring range
One gauge with 1 1/4"-2 1/8" measuring range
S579GZ0000000000000
65/16"-6"2"SteelOne gauge with 5/16"-1/2" measuring range
One gauge with 1/2"-3/4" measuring range
One gauge with 3/4"-1 1/4" measuring range
One gauge with 1 1/4"-2 1/8" measuring range
One gauge with 2 1/8"-3 1/2" measuring range
One gauge with 3 1/2"-6" measuring range
S579HZ000000000000

Starrett Telescoping Bore Gauges

Spring tension forces two telescoping steel contacts to expand inside the bore; turn the screw to lock the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.

Measuring
Range
Max.Dp.
Measured
MaterialHandle
Lg.
Manufacturer
Model Number
 Each
5/16"-1/2"2"Steel2 7/8"579A000000000000
1/2"-3/4"2"Steel2 7/8"579B00000000000
3/4"-1 1/4"2"Steel2 7/8"579C00000000000
1 1/4"-2 1/8"2"Steel2 7/8"579D00000000000
2 1/8"-3 1/2"2"Steel2 7/8"579E00000000000
3 1/2"-6"2"Steel4"579F00000000000

Economy Telescoping Bore Gauge Sets

Four Gauge Set

Six Gauge Set

Spring tension forces two telescoping steel contacts to expand inside the bore; turn the screw to lock the contacts. To find the bore diameter, use a micrometer to measure the distance across the contacts.

Number
of Gauges
Measuring
Range
MaterialIncludes Each
45/16"-2 1/8"Chrome-Plated Brass, SteelOne gauge with 5/16"-1/2" measuring range
One gauge with 1/2"-3/4" measuring range
One gauge with 3/4"-1 1/4" measuring range
One gauge with 1 1/4"-2 1/8" measuring range
0000000000000
65/16"-6"Chrome-Plated Brass, SteelOne gauge with 5/16"-1/2" measuring range
One gauge with 1/2"-3/4" measuring range
One gauge with 3/4"-1 1/4" measuring range
One gauge with 1 1/4"-2 1/8" measuring range
One gauge with 2 1/8"-3 1/2" measuring range
One gauge with 3 1/2"-6" measuring range
000000000000
Sours: /telescoping-gauges/
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The Anatomy of a Telescopic Gauge

February 12, 2020 10:15 am

Telescoping gauges, commonly referred to as snap gauges or telescoping bore gauges, are indirect measuring devices used to measure the internal diameter of a bore, hole, groove, slot, etc. This T-shaped tool consists of a handle, two telescopic rods and a locking screw.

telescopic gauge

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 typical for different machinists to have different techniques due to the “touchiness” of the telescopic gauges. A very real argument exists among the metalworking community that telescoping gauges are unreliable especially when it comes to repeatability. Once you develop your feel for the tool, telescopic gauges are a respectable option. Just like anything else, achieving successful and repeatable results takes a bit of practice. Since your success is very dependent on your growing feel for the tool, it’s recommended as you get started to double check your readings.

Recommended models

Starrett S579GZ Self Centering Telescoping Gauge With 2 Telescoping Arms Set

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With two plunging telescopic rods, this set measures holes, slots and recesses up to 6 inches in diameter and comes with a protective case. These gauges work for measuring both to the tenth and to the thousandth.

Mitutoyo 155-903, 6-piece Telesopic Gage Set

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Both legs of the gauge are plunging in this Mitutoyo set. If the type of machining you do calls for long reach, these would be the ones for you. Measures up to 6 inches.

Find other Mitutoyo gauge ranges and set sizes here and here.

Fowler 52-470-006 SteelTelescopic Gage with Double Action Rigid Handle

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The Fowler gauge features a rigid rod, which is helpful for grip and comes with vinyl casing for storage.

6 Pc Precision Telescoping Gage Set 5/16″ – 6″ Range T-Bore Hole Gauges w/ Pouch

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They get the job done, they’re no Starrett but you already knew that! As long as you check your work you will be good to go. Keep them safe in the included pouch!

Anytime Tools Bore Gauge 6 pc 5/16″-6″ Premium Telescopic High Precision T-Gage Set w/Hard Shell Case

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Recommended if your project allows you to measure in fractions of an inch, not thousandths.

 

Beyond telescopic gauges, there are other toolsthat can help measure the diameter of a hole. If you’re interested in hearing what our members think about the topic and specifically telescoping gauges, join the conversation here.

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Categories: Inspection & Measurement

Sours: https://www.practicalmachinist.com/inspection-and-measurement/the-anatomy-of-a-telescopic-gauge/
Telescoping gauge

6 Pc Precision Telescoping Gage Set 5/16" - 6" Range T-Bore Hole Gauges w/ Pouch

[MATERIAL]: It is made of carbon steel with chrome plating on the surface
[PACKAGE INCLUDE]: Range: 5/16" - 6" (8mm to 150mm),6PCS in total(1 gage: 5/16 - 1/2" range x 4.20" overall; 1 gage: 1/2 - 3/4" range x 4.40" overall; 1 gage: 3/4 - 1-1/4" range x 4.40" overall; 1 gage: 1-1/4 - 2-1/8" range x 5.85" overall; 1 gage: 2-1/8 - 3-1/2" range x 5.85" overall; 1 gage: 3-1/2 - 6" range x 5.85" overall); Ethylene plastic bag packaging
[OPERATION METHOD]: Use the gauge to expand in the hole to be measured, lock it in place, and then take it down, and measure with micrometer or caliper to determine the final hole size
[HIGH PERFORMANCE]: The rigid handle and double acting design (automatic centering) can quickly check the internal dimension. The spring tension is constant and the hand feel is even.
[APPLICATION]: It is used to obtain the exact size of holes and slots, which is suitable for factories, schools, offices and other places

Sours: https://www.amazon.com/Pc-Precision-Telescoping-Gage-Set/dp/B00R5E5PI6

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