How Does Telescopic Tool Work?

A telescopic pole, also known as a telescoping pole or telescopic extension pole, is a type of pole with adjustable length that can be extended or retracted. This design allows users to customize the length of the pole according to their needs, making it a versatile tool for various applications such as cleaning, painting, photography, and, in the context of our previous discussion, for attaching to tools like pole saws. The telescopic mechanism relies on a few key components and principles.

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Components of a Telescopic Pole:

Sections: Telescopic poles consist of multiple sections, typically three to five, nested inside each other. These sections are usually made of lightweight but durable materials such as aluminum or fiberglass.

Locking Mechanism: To keep the extended sections in place, there is a locking mechanism. Common types include twist locks, flip locks, and clamp locks. Twist locks involve rotating one section relative to another until they lock together, flip locks flip open or closed, and clamp locks use a lever to tighten a clamp around the sections.

Aluminum Telescopic pole with American Thread

Inner and Outer Tubes: The tubes that make up the sections have different diameters, with the smaller (inner) tubes sliding into the larger (outer) tubes. The difference in diameter allows for smooth extension and retraction.

Grips and Handles: Telescopic poles usually have grips or handles at the bottom end for comfortable and secure handling. Some designs also include ergonomic features to reduce strain on the user's hands during prolonged use.

How Do Telescopic Poles Work?

Extension: To extend the telescopic pole, the user releases the locking mechanism and pulls the smaller sections out of the larger ones. The sections slide smoothly due to the difference in diameter. The locking mechanism is then engaged to secure the extended length.

Retraction: Retracting the pole involves releasing the locking mechanism and pushing the sections back into the larger ones. The process is generally smooth and can be done quickly. The locking mechanism is again engaged to secure the retracted length.

Advantages of Telescopic Poles:

Adjustable Length: The primary advantage of telescopic poles is their adjustable length. Users can customize the pole's size based on the task at hand, allowing for greater flexibility and reach without the need for multiple fixed-length poles.

Portability: Telescopic poles are often more portable than fixed-length poles because they can be collapsed to a compact size for easy storage and transportation.

Versatility: The ability to adjust the length makes telescopic poles versatile tools suitable for various applications. They are commonly used for tasks like painting, cleaning high surfaces, photography, and reaching distant branches with tools like pole saws.

Ease of Use: The telescopic mechanism is designed to be user-friendly, making it easy for individuals to extend and retract the pole without much effort.

In summary, a telescopic pole works by having nested sections with a locking mechanism that allows users to extend or retract the pole to achieve the desired length. This design provides versatility, portability, and ease of use for a wide range of applications.

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Telescoping 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.

There are telescopic gauges with two plunging telescopic rods and others with only one. With the help of a micrometer, the telescopic rods measure the distance of the bore. The ends of the rod are the shape of a half circle (called the radius edge), which is responsible for getting accurate measurements. Gently twisting the locking screw clockwise secures the telescopic rod(s) into position. When twisted counterclockwise, the screw is released, and the telescopic rods can move freely again.

How to Use Telescopic Gauges

Developing a good feel for the tool requires a little bit of practice. Collapse both measuring heads by rotating the locking screw counterclockwise. 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 by too much because the rods are spring-loaded. Proceed to tilt the gauge so the rods are inclined just a touch above horizontal, then tighten the locking screw (clockwise). Whichever end you lifted first, force it downward (the opposite way), slowly 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. Finally, measure with a calibrated micrometer.

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Are Telescope Gauges Reliable?

Due to the touchiness of telescopic gauges, different machinists have different techniques. Some metalworking community members argue telescoping gauges are unreliable in terms of repeatability. However, once you develop your feel for the tool, they are a good option. Repeatable results just take a bit of practice.

Here’s machinist and YouTuber Adam Booth with his non-traditional approach.

Recommended models

Starrett S579GZ Self Centering Telescoping Gauge With 2 Telescoping Arms Set

With two plunging telescopic rods, this set is best for measuring both to tenths and thousandths.

Mitutoyo 155-903, 5/16" to 6", 6-piece Telescoping Gage Set

Best for projects requiring long reach. The set has two plunging legs and is known to provide good feel and lock up.

Fowler 52-470-006 Steel Telescoping Gage with Double Action Rigid Handle

Features a rigid rod which is helpful for grip.

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

They’re no Starrett, but you already knew that! Doublecheck your work and you will be good to go.

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

Best for projects that need to be measured in fractions of an inch, not thousandths.

There are other tools that can help measure the diameter of a hole. If you’re interested in hearing what Practical Machinist members think about bore measuring tools, join the conversation here.

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