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How To Buy The Best Bench Grinder

Best Bench Grinder

Looking to buy the best Bench Grinder? Check out our guide below and you’ll be well-placed to select the right one for you.

Bench grinders are one of our favourite power tools since they are versatile machines that can be used for grinding, polishing, and linishing (or belt sanding), and they are also reasonably basic devices, making choosing the best bench grinder for one’s workshop a breeze.

Essentially, once you’ve decided on the grinding wheel diameter you want to use, which is usually 6″ (150mm) or 8″ (200mm), it’s just a matter of purchasing the most powerful equipment you can afford while keeping an eye out for the features that each offers.
The option to swap out the wheels for different types of grinding wheels, wire wheels, or polishing mops is one of those qualities, giving the humble bench grinder a wide range of capabilities.

In this guide on bench grinders, we’ll look at what DIYers typically use them for and what characteristics to look for when buying one for your workshop.
Following that, in our more extensive bench grinder evaluations further down the page, we examine individual bench grinders available in the UK.

What can a Bench Grinder be used for?

Sharpening of tools

Sharpening tools is the most common application for a bench grinder.
The wood chisel is a traditional tool that almost every bench grinder will come upon at some time in their careers.
Wood chisels must be razor-sharp, and the sharper they are, the more efficient they are.
A drill bit is another instrument that is frequently sharpened with a bench grinder.
Drill bit sharpening is a little more difficult to get right, and it’s best accomplished with the help of a specialised drill bit sharpening accessory intended to work with a bench grinder.
Lawnmower blades are another tool that should be mentioned because they, too, are frequently sharpened with a bench grinder, especially by DIYers.
These get dull over time as they come into contact with stones or other hard surfaces while mowing the lawn.

Metal surfaces that have been freshly cut should be deburred.

Deburring freshly cut metal surfaces is another good application for a bench grinder.
Sharp, ugly burrs are almost always created on the cut surfaces when metal is cut.
These burrs are usually very sharp, and if not dealt with promptly, they can be harmful to the user or cause damage to adjacent surfaces.
Machine screws, for example, are frequently reduced to more appropriate lengths for the project at hand by DIYers.
This is where the bench grinder comes in handy, as it can quickly smooth them out and make them more usable.
One crucial safety aspect to remember when grinding small things is to hold them in place using pliers or a similar tool so that the grinding action does not easily remove them.

Rust or paint removal

The removal of rust from rusted metal surfaces or the eradication of some old paint layer that has begun to flake off is another popular usage for the multi-functional bench grinder.
When prepping a metal surface for a fresh protective coating, this is especially important.
One of the grindstones on a bench grinder must be changed with a wire wheel to perform this type of job.

Polishng Metal surfaces

The bench grinder may also be used to give metal a surface shine by using a polishing mop instead of one of the basic grindstones.
One thing to keep in mind is that the bench grinder engine must be powerful enough to resist the frictional forces created by shinny surfaces.
When using a polishing mop, underpowered motors may often slow down, making polishing difficult, if not impossible.

Bench Grinder Features to Look for

Grinding wheel diameter – In the DIY hobbyist bench grinder category, there are a few distinct standard wheel sizes.
Obviously, the larger the wheel diameter, the larger the bench grinder’s physical dimensions, which may be a significant issue in a garage or home workshop with limited space.
The following are the most frequent diameters:

75 millimetres (3″)

150 millimetres (6″)

200 millimetres (8″)

So, what size should you get?
After determining whether the bench grinder size will fit in the workshop space allotted to it, the ideal size is largely a matter of personal preference.
The size of the wheel has an effect on some bench grinder characteristics, such as a larger wheel has a faster angular velocity at the grinding edge, affecting the rate of frictional heating, or smaller wheels are more curved at the grinding point, causing minor differences in bevel formation, but the effect on actual function is minimal.

Power – When purchasing a bench grinder, this is arguably the most critical factor to consider.
Watts are the unit of measurement for how tough a material can be on a bench grinder and how quickly material can be removed from the topic being ground.
The higher the pressure on the grinding surface, the harder the material being ground and the faster it must be removed.
If the machine isn’t powerful enough, pressing down too hard on the grinding surface will cause the wheel to slow down (or even stop), making grinding tiresome and unpleasant.
A powerful motor in the bench grinder is much more crucial when polishing with a wire wheel or a mop, and most low-power (e.g. 150W) budget machines will not be able to polish properly at all.

Capabilities – You should select ahead of time what you want your bench grinder to do, and while most bench grinders can chop and change discs, knowing what you’ll use it for can help you pick the right grinder.
The following are examples of common configurations:

Two different grit dry grinding wheels

One cloth polishing wheel and one dry grinding wheel

One wire brush wheel and one dry grinding wheel

One belt sander and one dry grinding wheel

There are two types of grinding wheels: one for dry grinding and one for wet grinding.

Wheel bore size – The wheel bore size is only important when you want to alter the wheels from one coarseness to another or to various wheel kinds.
In such circumstances, knowing the wheel bore size is critical so that proper sized replacements can be ordered.

The more powerful the bench grinder is and the less well built it is, the more vibration and noise it produces.
Bench grinders, on the other hand, are rather quiet in comparison to most other power equipment!

Additional Considerations When Using a Bench Grinder

Grindstone surfaces gradually wear down and become clogged with metal filings during usage, thus it’s important to dress the bench grinder on a regular basis.
Use a diamond-studded dressing tool to remove metal filings and expose fresh grit on the grindstone wheel surface to rejuvenate the grinding surface.
Drawing a pencil line on the wheel and continuing the dressing process until the pencil line vanishes is one approach to ensure that you have appropriately prepared the wheel.
However, the dust formed by grindstone dressing is detrimental to your health, so wear a dust mask!

Bench grinders are designed for grinding down steel and related metals and should not be used to grind aluminium.
Never use a bench grinder to grind down aluminium because the filings formed by this metal can build up in the wheel, causing it to catch fire when the wheel becomes hot during a subsequent grinding session.
This can cause the wheel to deteriorate while being used, putting the user in danger.

Use the appropriate grindstone grits for the operation – coarser grit wheels will remove material faster, allowing the tool or wheel to cool down faster.
When a lot of material needs to be removed, utilise rougher wheels.
Finer wheels, on the other hand, are used to remove smaller amounts of material, such as when polishing the edge of a blade.
A coarser wheel may be required at first if the blade is chipped or too dull and more material needs to be removed to reestablish a uniform blade edge.

Move the thing being ground back and forth over the grinding surface – By repeatedly moving the object across the grinding surface, heat is distributed evenly across the wheel surface.
Overheating a grinding wheel increases the likelihood of it cracking, making it unsafe to use because of the risk of it disintegrating later.

Lower bench grinding speeds assist manage heat build-up – If possible, utilise a lower bench grinding speed to better regulate heat build-up on both the object being ground and the grinding wheel itself.

Heat-treated hardened surfaces require special caution – some tool surfaces have been hardened by heat treatment.
This means that warming such a surface can slow down the hardening process and cause the metal to soften.
As a result, keep an eye on how hot the object being ground becomes to avoid damaging it.
While grinding, don’t apply too much pressure to the tool and cool it down by dipping it in water.

For DIYers, white wheels are preferable –
White wheels (as opposed to grey or light blue wheels) are gentler grinding wheels that make it simpler to create a sharp edge on a tool, but they wear out faster than their darker counterparts.
These types of wheels are usually more ideal for DIYers who only use bench grinders on a very occasional basis.

Know the maximum speed of the grinding wheel and the bench grinder – When buying new grinding wheels, make sure the maximum speed is not less than the rotational speed of the bench grinder it will be used on. Otherwise, spinning the wheel at too high a speed can cause it to disintegrate during use, posing a safety hazard.

Best Bench Grinder to buy

SaleBestseller No. 1
Record Power RSBG8 Bench Grinder 8-inch
  • Powerful 500-watt induction motor
  • Adjustable tool rests
  • Compact design
  • Smooth running
  • Holds two wheels
Bestseller No. 2
Einhell TH-BG 150 Bench Grinder | 2980 RPM, 150mm x 16mm Coarse and Fine Grinding Wheels (K36/K60) | Electric Bench Grinder Polisher For Grinding, Polishing And Sharpening
  • Four rubber feet for safe, low-vibration standing
  • Adjustable work supports for different applications
  • Robust compact metal construction for a long service life
  • Zero-play ball-bearing shaft enables precise operations
  • Adjustable spark reflectors for safe operation
Bestseller No. 3
Silverline 263511 DIY 150W Bench Grinder 150 mm UK
  • Fitted with 150 mm coarse and fine grade grinding wheels
  • Large eye shields for operator protection
  • For light to medium duty grinding
  • All-steel wheel guards, tool rests and rubber mounting feet
  • Includes 2 x adjustable tool rests, eye shields, spark arrestors and wheel guards
Bestseller No. 5
Draper 05097 200mm 550W 230V Heavy Duty Bench Grinder with Worklight
  • Two grinding wheels
  • Worklight
  • Adjustable eye protection shields
  • Spark deflectors
  • Wheel guards
Bestseller No. 6
Sealey BG150XW/99 Heavy-Duty Bench Grinder with Wire Wheel, 150mm, 450W/230V
  • Fitted with stone guards, adjustable eye shields and spark arrestors
  • Supplied with BS standard plug
  • Supplied with: Stone, Wire Wheel
  • Motor Power: 450W
  • Supply: 230V
Bestseller No. 7
Draper 6" 250W Bench Grinder Polisher with Pro-Max 6" Metal Polishing Kit
  • Great Quality Bench Grinder With Pro-Max General Purpose Bench Grinder Metal Polishing Kit
  • Can Be Used To Polish Aluminium, Alloys, Brass, Copper, Steel & Stainless Steel To A Bright Finish.
  • Comes With A Guide To Metal Polishing And Bench Grinder Conversion Instructions.
  • Use As A Bench Grinder, Grinder And Polisher Or Dedicated Polisher.
Bestseller No. 8
Bench Grinder Polisher 6" 150W with Pro-Max 4" Metal Polishing Kit
  • Great Quality Bench Grinder With Pro-Max General Purpose Bench Grinder Metal Polishing Kit
  • Can Be Used To Polish Aluminium, Alloys, Brass, Copper, Steel & Stainless Steel To A Bright Finish.
  • Comes With A Guide To Metal Polishing And Bench Grinder Conversion Instructions.
  • Use As A Bench Grinder, Grinder And Polisher Or Dedicated Polisher.
SaleBestseller No. 9
Silverline 612519 DIY 240W Bench Grinder and Belt Sander 240W
  • Long-life induction motor with sealed bearings
  • Durable, cast aluminium body
  • Angled 350 mm belt sander with 2 x tool rest positions
  • 2950rpm grinder with 150 x 20 mm wheel
  • Includes grinding wheel, belt, 2 x tool rests, spark arrestor and eye shield

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