Ball knobs offer an ergonomic and effective way to control machinery. They are characterized by a round, ball-shaped handle. Like with other types of industrial knobs, ball knobs are used in control applications that involve an up-down or right-left directional movement. Here are six things to consider when choosing a ball knob.
#1) Material
You should consider the material when choosing a ball knob. The material will affect how well the ball knob will perform in its intended environment. Common materials include thermoplastic, phenolic and steel. Thermoplastic and phenolic offer a superior level of protection against rust and corrosion, making them ideal for humid environments. Steel, on the other hand, offers a superior level of strength and durability.
#2) Diameter
Something else to consider when choosing a ball knob is the diameter. The diameter represents the size of the ball. It’s measured as a straight line that passes through the center of the ball from one end to the opposite end. Small ball knobs often have a diameter of 1 inch, whereas larger ball knobs may have a diameter of 2 or more inches. Regardless, you can check the diameter to gain a better understanding of the size of a ball knob.
#3) Smooth vs Knurled
Some ball knobs are smooth, whereas others are knurled. Smooth ball knobs feature a sleek, smooth surface that’s devoid of ridges or indentions. Knurled ball knobs, in comparison, have a knurled or textured surface. Smooth ball knobs typically feature a more polished appearance, whereas knurled ball knobs are easier to grip thanks to their textured surface.
#4) Tapped vs Stud
Nearly all ball knobs can be categorized as tapped or stud depending on how they are installed. Tapped ball knobs feature a threaded hole for installation. You can install them by twisting them onto a threaded rod. Stud ball knobs, on the other hand, feature a threaded rod. You can install them by twisting them into a threaded hole.
#5) Thread Type
Don’t forget to consider the thread type when choosing a ball knob. Whether tapped or stud, most ball knobs have threading. The thread type represents the size of this threading. You’ll need to choose a ball knob in a thread type that matches the machinery with which you intend to use it.
#6) Shank vs No Shank
Ball knobs are available with and without a shank. A shank is essentially a short neck at the base of a ball knob. It adds height to the ball knob so that there’s more distance between the knob and the machinery with which it’s used.