Engineering help: How to choose, use ergonomic hand tools

Ergonomically enhanced tools can include helpful features, but no matter how impressive a tool’s design is, it’s almost impossible for it to be universally ergonomic. Here are some handy tips.

08/26/2008


Automation, controls, and instrumentation engineers and technicians still use hand tools on their way to engineering a solution. Here are handy tips to staying safe, and choosing effective hand tools from Paul Holstein, co-founder and COO of CableOrganizer.com , e-tailer of cable, wire and equipment management solutions.
Drop into any hardware store or home improvement center, and you’re likely to find aisles full of tools labeled “ergonomic.” But what exactly does that mean for consumers? Simply put, ergonomics is the science of designing and producing tools, furniture, and other work-related implements that improve a worker’s efficiency while reducing discomfort, fatigue, and risk of injury.
Ergonomically enhanced tools can include helpful features like angled handles, padded handgrips and non-slip coatings. However, no matter how impressive a tool’s design is, it’s almost impossible for it to be universally ergonomic since human physiques and project applications vary greatly from one to the next.


Whether you’re shopping for ergonomic tools or just trying to select the right one for the job from an existing collection, the key things to consider are whether or not the tool fits your hand, how well it suits the job being done, and whether or not it eases your work and prevents you from straining in ways that could lead to injury. Regardless of how user-friendly a tool is built to be, the most important deciding factor in what makes a tool ergonomic is, ultimately, you.
To make the decision process a little easier, here are some guidelines for choosing the right ergonomic hand tool for your body type…and the job at hand:
• Because finger size and placement differs from person to person, avoid using tools whose handles have built-in finger grooves. When fingers don’t naturally align with grooves, excessive pressure from the raised groove edges can cause discomfort and injury.
• Choose tools with handles that are covered in a soft material, like foam or flexible plastic. Cushioned handles are not only comfortable for long hours of use, but they provide a much firmer grip and cut down on slippage. Hard-handled tools can be quickly and inexpensively converted by just adding a sleeve.
• Ensure tool handles are free from sharp edges and seams that might irritate or cut the hands.
• When selecting double-handed gripping and cutting tools, opt for ones with spring-loaded handles that will automatically return to the open position.
• If you need to forcefully pinch or grip an object for an extended amount of time, prevent muscle strain by switching from standard pliers to a clamp or grip.
• Only use tools that allow you to work with your wrist in a straight position.
Force and impact: For tasks that require force, such as torquing screws and nuts, hammering, and heavy chiseling, choose single handle tools with handle diameters that range from 1 1/4 inches - 2 in. Larger handles allow fingers to wrap comfortably around the tool in a power grip, which prevents slippage and reduces stress and impact on hands, fingers and wrists.
Get a grip: For tasks that call for more precision and delicacy (like fine chiseling and driving miniature screws), opt for single-handle tools whose grips fall within the 1/4 in. - 1/2 in. range. The smaller diameter handles make it easy to comfortably grip tools between the fingertips without overexerting fingers, knuckle joints, or hand muscles.
Just as grip diameter affects work with single-handle tools, the grip span of pliers, snips, cable cutters and other double-handled tools can either make your job easier or cause you hand fatigue. For maximum comfort and efficiency for tasks that require more force (like gripping with large pliers, cutting wires, or snipping through sheet metal), choose tools with a maximum “open” grip span of 3
Work areas: Detailed jobs that involve grasping small parts and components with pincers, tweezers or tongs are best done with double-handle tools whose grip spans range from no less than 1 in. (closed) to no more than 3 in. (open).
When a work space is tight but the task at hand requires a good deal of force, opt for “power grip” tools (with handle diameters from 1
Tool length should also be matched to space constraints. Excessively long tools can force you to assume awkward work postures and wrist positions when you’re trying to reach components in cramped areas. Instead, choose short-handled tools that give you the freedom to meet the target work area directly, while keeping your wrist straight.
Protect your palms: The palms of your hands are full of pressure-sensitive nerves and blood vessels, and to avoid damaging these during high force tasks, it’s important to make sure that the handles of your tools are long enough that their ends won’t press into your palms. To measure, hold your hand palm-up, with fingers together and thumb against the side of your hand. As long as the tool’s handle is longer than the widest part of your hand (the span from the outer edge of your pinkie to the outer edge of your thumb), it’s safe to use.
Edited by C.G. Masi , senior editor
Control Engineering News Desk





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