A rotary tool is the Swiss Army knife of the power tool world. It spins a tiny attachment at extremely high speed — 10,000 to 35,000 RPM — letting you carve, engrave, cut, grind, polish, sand, and drill in places that no other tool can reach. Dremel is the brand name everyone knows, but there are plenty of capable alternatives at lower prices. Here’s what to look for.
What Can You Use a Rotary Tool For?
- Engraving and carving — wood, metal, glass, stone
- Cutting small items — bolts, nails, screws, thin sheet metal, plastic, tile
- Grinding and deburring — removing sharp edges from cut metal, grinding down welds
- Sanding in tight spaces — detail sanding, shaping curves
- Polishing — metal, jewellery, glass edges
- Sharpening — drill bits, chisels, knives, scissors
- Cleaning rust — wire brush attachments remove rust from bolts, hinges, tools
- Hobby and craft work — model making, jewellery, miniatures
Key Specs to Understand
Speed (RPM)
Variable speed is essential. Different materials and tasks require different speeds:
| Speed Range | Best For |
|---|---|
| 5,000–15,000 RPM | Polishing, cleaning, brass brushing |
| 15,000–25,000 RPM | Sanding, carving wood, light grinding |
| 25,000–35,000 RPM | Cutting metal, engraving, precision grinding |
A tool with a range of at least 10,000–33,000 RPM covers virtually every task.
Collet Size
The collet holds the accessory shank. Most rotary tools accept 3.2mm (1/8-inch) shank accessories — this is the universal standard. Better tools also include a 1.6mm collet for fine engraving bits and a 6mm collet for larger grinding stones. Make sure your tool comes with at least a 3.2mm collet — this ensures compatibility with the widest range of accessories.
Power (Watts)
For corded tools, 130–175 watts is typical and adequate for most tasks. Higher wattage (200W+) helps with sustained cutting and grinding tasks but isn’t necessary for hobby work. For cordless tools, the battery voltage (12V vs 8V) is a better indicator of capability.
Dremel vs Alternatives
| Brand/Model | Type | Speed Range | Power | Typical Price | Best For |
|---|---|---|---|---|---|
| Dremel 4300 | Corded | 5,000–35,000 RPM | 175W | £90–£120 | All-round best, EZ twist nose cap |
| Dremel 4000 | Corded | 5,000–35,000 RPM | 175W | £70–£100 | Proven workhorse, excellent value |
| Dremel 8260 | Cordless (12V) | 5,000–35,000 RPM | 12V Li-ion | £130–£160 | Cordless freedom, brushless motor |
| Bosch GRO 12V-35 | Cordless (12V) | 5,000–35,000 RPM | 12V Li-ion | £50–£80 (body) | Part of Bosch 12V system |
| Silverline 249765 | Corded | 8,000–33,000 RPM | 135W | £20–£30 | Budget option for occasional use |
| Tacklife RTD35ACL | Corded | 10,000–40,000 RPM | 135W | £25–£35 | Budget with large accessory kit |
| Proxxon FBS 240/E | Corded | 5,000–20,000 RPM | 100W | £60–£80 | Precision craft, low vibration |
Dremel’s accessories are the gold standard, and any Dremel-compatible accessory (of which there are thousands) fits any tool with a 3.2mm collet — not just Dremels. So even if you buy a budget alternative, you get access to the full Dremel accessory ecosystem. The Dremel product catalogue shows the full range.
Essential Accessories
Most rotary tools come with a basic accessory kit, but here are the accessories you’ll actually use most:
- Cutting discs — reinforced fibre cutting wheels for metal. Buy in bulk — they wear quickly
- Sanding drums — small cylindrical sanders for shaping and smoothing. Multiple grits
- Grinding stones — aluminium oxide stones for grinding and sharpening. Various shapes for different tasks
- Wire brushes — brass (soft, won’t scratch) and steel (aggressive, for rust removal)
- Polishing compounds and felt wheels — for metal polishing and buffing
- Diamond cutting disc — for cutting tile, glass, stone. More expensive but lasts much longer than fibre discs
- Collet nut wrench — for changing accessories (unless your tool has tool-free change)
Useful Attachments
- Flex shaft — a flexible extension that gives you a pen-like grip for detailed work. Essential for engraving and carving. Axminster stocks the Dremel flex shaft
- Router attachment — turns the rotary tool into a miniature router for inlay work and edge trimming
- Drill press stand — for precision vertical drilling in small workpieces
- Cutting guide — for straight, controlled cuts in sheet material
Corded vs Cordless
Corded rotary tools are lighter, cheaper, and provide consistent power. Cordless models (typically 8V or 12V) offer freedom of movement but are heavier and have limited runtime. For workshop use, corded is the better choice. For on-site work or jobs where the cord gets in the way of detailed work, cordless makes sense — especially if you’re already in a battery platform like Bosch’s 12V system.
Tips for Better Results
- Let the speed do the work — apply light pressure. Forcing the tool slows the motor and overheats accessories
- Match speed to material — lower RPM for plastics (they melt), higher RPM for metals and hard materials
- Wear safety glasses always — cutting discs throw sparks and fragments. A face shield is even better
- Secure the workpiece — the high RPM can grab and fling small pieces. Use a vice or clamp
- Replace worn accessories — a worn cutting disc is more dangerous than a sharp one. Discs should be replaced when they’ve worn to half their original diameter
Who Should Buy a Rotary Tool?
If you do any kind of hobby work, small repairs, metalwork, jewellery making, or model building, a rotary tool is indispensable. For general DIYers, it’s a nice-to-have rather than essential — an oscillating multi-tool covers more common household tasks. But for the price of even a budget rotary tool (£20–£30), it’s worth having one in the drawer for those jobs where nothing else will work.
