Check that the safety features are all present and working, that the motor runs smoothly with no burning smell or grinding noise, that the cord or battery contacts are undamaged, and that the tool is complete with its guards, fence and any original accessories. If a seller cannot demonstrate it running, treat that as a warning sign, not a bargain.
Why does it matter more with power tools than with hand tools?
A used hand plane or chisel that turns out to be tired just needs sharpening or flattening. A used power tool that turns out to be tired can throw a workpiece, seize mid-cut, or fail electrically while it’s in your hands. The stakes of a bad buy are higher, and so is the value of a careful look before you pay. For a general sense of what separates a tool built for occasional home use from one built for daily trade work, the guide on DIY, prosumer and trade tools is worth reading before you go looking, since it changes what “well used” should mean for a given machine.
Are the guards and safety features all present?
Yes — check this before anything else, because a missing or modified guard is not a cosmetic issue. It means the tool is not safe to use as it left the factory, and it is not something to fix with a workaround at home.
Walk through the specific features that model is supposed to have, using the manual if the seller has it or the manufacturer’s listing if not:
- Blade guards that move freely and return on their own, not taped, wedged or removed
- A riving knife on a table saw that is present and correctly aligned — see what a riving knife does and why it isn’t optional for what to look for
- Anti-kickback pawls on the same saw, intact and able to pivot
- A working dead-man switch or trigger that cuts power the instant it’s released — read what a dead-man switch does if you’re not sure what to test for
- Any interlocks, chip deflectors or blade brakes the model was sold with, still fitted
If any of these are missing, damaged, or clearly altered, that is a reason to pass on the tool, not a detail to negotiate on price. Sourcing a genuine replacement guard for an older or unfamiliar model can be difficult and sometimes impossible.
Does the motor sound and smell right when it runs?
A healthy motor runs smoothly, spins up promptly, and has no smell. Grinding, screeching, a burning odour, visible sparking beyond the normal brush glow, or a motor that struggles to reach full speed are all signs of wear that may be expensive or impossible to fix.
Ask to see the tool actually running, ideally under some load rather than just spinning free. If it’s a corded tool, listen for a change in tone when it’s put to light work. A burning smell in particular is worth taking seriously — the article on what a burnt smell from a power tool means covers the difference between a smell that’s normal break-in and one that points to a failing motor or winding.
Many corded power tools still use brushed motors, which wear predictably over their life and eventually need new brushes or fail outright. Understanding why brushed motors eventually fail helps you judge whether visible brush wear on an older tool is a quick fix or a sign the motor itself is near the end.
What should you check on the cord, plug and battery contacts?
Check for cracked or taped insulation, a plug that isn’t the original or looks home-repaired, and any sign of heat damage around the cord entry or battery terminals. None of these are jobs to fix yourself with a soldering iron and hope.
A cord with cracked sheathing, exposed wire, or a plug that’s been swapped for a non-standard one is a reason to have it inspected by a qualified person before it’s ever plugged in, not a DIY repair. The same goes for anything that shows scorch marks near the switch or cord entry. If the tool is destined for a home workshop circuit, it’s also worth understanding what protection that circuit should already have — the plain guide to what an RCD does on a workshop circuit explains what this safeguard covers and why it matters regardless of how good the tool itself looks.
On cordless tools, check the battery contacts for corrosion or bent pins, and ask how the battery has been stored. A pack left sitting at full charge for long periods ages differently to one cycled and stored partly discharged — see what storing a battery at full charge does and how lithium-ion tool batteries actually age for what actually shortens a pack’s working life. A tool with a dead or badly aged battery, and no way to test a fresh one on the spot, is effectively being sold without a power source.
What does surface rust or grime actually tell you?
Light surface rust on a cast iron table or fence is usually cosmetic and can be addressed. Rust or heavy grime on bearings, inside the motor housing, or around moving parts is a different matter — it points to a tool that’s been stored badly and may have internal wear you can’t see.
Understanding what rust actually does to a tool beyond the surface helps separate a table that needs a clean and a wax coat from a mechanism that’s seized or pitted where it matters. Ask where and how the tool was stored — a damp shed or garage is a bigger clue than the seller’s asking price.
Is the blade, bit or consumable in good condition — and does that matter?
A blunt blade or worn bit is not a dealbreaker on its own, since these are wear items you’d replace anyway. But it’s worth knowing what a poor cutting edge has already done to the tool behind it, because a machine forced to work harder than it should shows up in the motor over time. The guide to what a blunt blade does to a motor explains why this is worth factoring into your judgment of the tool as a whole, not just the cost of a replacement blade.
Check the arbor, chuck or collet for play, chips, or a bore that’s been damaged by a badly fitted accessory. These are the parts that determine whether the tool can even accept a standard replacement blade or bit going forward.
Is the tool complete, and does the seller have any history for it?
A complete tool includes its fence, mitre gauge, dust port, any jigs it shipped with, and ideally the manual. A seller who can tell you roughly how old it is, what it was used for, and why they’re selling is a better sign than one who can’t.
Original accessories matter more than they might seem — a missing fence or mitre gauge on a saw, for example, means sourcing an aftermarket replacement that may not fit as precisely as the one it was designed with. If you’re weighing a used purchase against buying new, the broader guide to choosing a tool and what the specs actually mean is a useful companion, since the same questions about duty cycle, build quality and what you’ll actually use it for apply whether the tool is new or secondhand.
How should you actually test it before handing over money?
Ask to see it plugged in or with a charged battery fitted, running under the seller’s supervision, ideally making an actual cut in a scrap piece if that’s practical and safe to arrange. Watch how it starts, how it sounds under load, and whether it stops immediately when the switch is released.
If you’re standing near a running saw, sander or grinder to test it, wear the eye protection that any tool throwing material demands, and be ready to keep hands well clear of the working end. If the test is going to be more than a few seconds of idling, consider ear protection too — a quick idle test at close range is louder than it feels. The safety and PPE section covers what each type of protection is actually rated for, which is useful context whether you’re testing someone else’s tool or setting up your own.
What should make you walk away entirely?
Walk away if a guard, riving knife, pawl or interlock is missing, taped over, or visibly modified. Walk away if the seller won’t demonstrate the tool running, if the cord or plug looks tampered with, or if there’s a strong burning smell you can’t explain. None of these are things to negotiate down on price and fix later.
It’s also worth knowing when a tool that seems to have a fixable fault is genuinely worth the trouble. The guide on when a tool is genuinely worth repairing lays out the trade-off between parts, labour and the cost of buying newer, which is exactly the calculation a rough-but-cheap used tool puts in front of you.
Is a used power tool actually a good idea for a home workshop?
It can be, provided the checks above come back clean and the price reflects genuine wear rather than hidden faults. A used tool with intact safety features, a sound motor and a complete accessory set can do everything a new one does for less money — but only if those things are actually true, not assumed.
Take the time before you buy, not after. A careful look at guards, motor, cord and battery costs a few minutes at the seller’s bench; sorting out a problem after it’s home, or after it’s already run once, costs a great deal more.
Find Tool publishes general information, not professional advice. Power tools, mains electricity and workshop machinery are genuinely dangerous, and the safe settings, guards and procedures differ between models — always follow the manual and the markings on the tool in front of you rather than a general guide. Never remove or defeat a guard or safety feature. Anything involving fixed wiring, gas or structural work belongs to a qualified tradesperson. Wear the eye, ear and respiratory protection the task calls for.
Featured image: Photo by Shixart1985, source, CC BY 2.0