Q: What shank size do I need for a Dremel rotary tool?

Most Dremel accessories use a 3.17mm (1/8") shank , which is the standard size for the vast majority of Dremel collets. Some smaller accessories — particularly mounted points and fine engraving bits — use a 2.35mm (3/32") shank , and Dremel tools typically include a collet adaptor for this size. Always check the product listing before buying, as fitting an oversized shank into a collet will damage both the accessory and the tool.

Q: What's the difference between a mounted point and a grinding wheel?

A mounted point is a small abrasive stone permanently bonded to a metal shank, designed for precision work in tight spaces — deburring, engraving, cleaning weld seams. A grinding wheel is a larger, disc-shaped abrasive that mounts via an arbor and is better suited to surface grinding and material removal over a wider area. Mounted points offer more control; grinding wheels remove material faster. PFERD specialises in mounted points, which explains their higher average price in this category.

Q: Can I use angle grinder discs on a rotary tool?

No — this is dangerous and should never be attempted. Angle grinder discs are designed for tools running at much lower RPM with a different arbor system. Fitting one to a rotary tool running at 25,000–35,000 RPM will almost certainly cause the disc to shatter. Always use accessories specifically rated for rotary tools and check that the maximum RPM on the accessory meets or exceeds your tool's top speed.

Q: How do I know when a grinding wheel needs replacing?

Replace a grinding wheel when you notice glazing (the surface looks shiny and smooth rather than gritty), excessive vibration, uneven wear, or any visible cracks or chips. Glazing means the abrasive particles have become dull and the wheel is generating heat rather than cutting — continuing to use it risks workpiece damage and can cause the wheel to break up. A wheel that's worn down to a small fraction of its original diameter should also be retired, as the reduced mass affects balance and RPM safety ratings.

Q: Are cheap own-brand grinding wheels worth buying, or should I stick to Bosch and Dremel?

For occasional DIY, Draper Tools wheels are genuinely decent value — they're the most widely stocked budget option in this category and hold up fine for light use. Where cheaper wheels fall short is consistency: grit sizing can vary within a batch, and maximum RPM ratings are sometimes optimistic. For regular use on metal or hardened materials, Bosch and Dremel accessories offer more reliable performance and better safety margins. Yato is the budget outlier — fine for very light work, but we wouldn't rely on them for anything structural.

Q: What grit should I start with for removing rust from metal?

Start with a 60–80 grit aluminium oxide wheel or sanding band for heavy rust removal — this cuts through oxidation quickly without loading up. Once the surface rust is gone, step up to 120 grit to smooth the surface, then 220 if you're preparing for paint or primer. Using a wire brush attachment first can help knock off loose scale before you start with abrasives, which extends the life of your grinding wheels considerably.

Question 1

What shank size do I need for a Dremel rotary tool?

Accepted Answer

Most Dremel accessories use a 3.17mm (1/8") shank, which is the standard size for the vast majority of Dremel collets. Some smaller accessories — particularly mounted points and fine engraving bits — use a 2.35mm (3/32") shank, and Dremel tools typically include a collet adaptor for this size. Always check the product listing before buying, as fitting an oversized shank into a collet will damage both the accessory and the tool.

Question 2

What's the difference between a mounted point and a grinding wheel?

Accepted Answer

A mounted point is a small abrasive stone permanently bonded to a metal shank, designed for precision work in tight spaces — deburring, engraving, cleaning weld seams. A grinding wheel is a larger, disc-shaped abrasive that mounts via an arbor and is better suited to surface grinding and material removal over a wider area. Mounted points offer more control; grinding wheels remove material faster. PFERD specialises in mounted points, which explains their higher average price in this category.

Question 3

Can I use angle grinder discs on a rotary tool?

Accepted Answer

No — this is dangerous and should never be attempted. Angle grinder discs are designed for tools running at much lower RPM with a different arbor system. Fitting one to a rotary tool running at 25,000–35,000 RPM will almost certainly cause the disc to shatter. Always use accessories specifically rated for rotary tools and check that the maximum RPM on the accessory meets or exceeds your tool's top speed.

Question 4

How do I know when a grinding wheel needs replacing?

Accepted Answer

Replace a grinding wheel when you notice glazing (the surface looks shiny and smooth rather than gritty), excessive vibration, uneven wear, or any visible cracks or chips. Glazing means the abrasive particles have become dull and the wheel is generating heat rather than cutting — continuing to use it risks workpiece damage and can cause the wheel to break up. A wheel that's worn down to a small fraction of its original diameter should also be retired, as the reduced mass affects balance and RPM safety ratings.

Question 5

Are cheap own-brand grinding wheels worth buying, or should I stick to Bosch and Dremel?

Accepted Answer

For occasional DIY, Draper Tools wheels are genuinely decent value — they're the most widely stocked budget option in this category and hold up fine for light use. Where cheaper wheels fall short is consistency: grit sizing can vary within a batch, and maximum RPM ratings are sometimes optimistic. For regular use on metal or hardened materials, Bosch and Dremel accessories offer more reliable performance and better safety margins. Yato is the budget outlier — fine for very light work, but we wouldn't rely on them for anything structural.

Question 6

What grit should I start with for removing rust from metal?

Accepted Answer

Start with a 60–80 grit aluminium oxide wheel or sanding band for heavy rust removal — this cuts through oxidation quickly without loading up. Once the surface rust is gone, step up to 120 grit to smooth the surface, then 220 if you're preparing for paint or primer. Using a wire brush attachment first can help knock off loose scale before you start with abrasives, which extends the life of your grinding wheels considerably.

Question 7

Is PFERD worth the premium over Bosch or Dremel for home use?

Accepted Answer

Rarely, unless you have a specific professional application. PFERD's mounted points and vitrified bond wheels are engineered for precision metalwork, production grinding and hardened materials — their quality is genuinely exceptional, but the price reflects industrial-grade tolerances that most home users simply don't need. For the vast majority of DIY and light trade work, Bosch and Dremel accessories deliver excellent results at a fraction of the cost. Save the PFERD budget for when you're working on hardened steel, carbide, or need consistent results across hundreds of pieces.

Rotary Tool Grinding & Sanding Supplies Price Comparison

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