How to Choose a Cordless Grinder - a Toolstop Buying Guide

how to choose a cordless grinder - buying guide from toolstop

The world of professional power tools is relentless moving towards cordless power. The ability to work independent from a constant power source is hugely appealing, meaning you aren't tethered to cables or power cords, and can access tricky to reach work areas much more easily.

As the battery technology behind these cordless tools continues to evolve and improve, power tool manufacturers and pushing the boundaries, slotting batteries onto power tools that were once absolutely tethered to a mains output.

Grinders have been fitted with batteries for a while, but:

  • what should you look out for when choosing a cordless grinder?
  • will a cordless grinder match up the applications I want to undertake?
  • how can you make sure you'll get the best cordless grinder for your typically applications?
  • which one will give you the right balance of power and performance per battery charge?


We've put together a shortlist of cordless grinders (click here to go straight to our shortlist) and whittled down all of the manufacturers' bluff about their features so that, at a glance, you'll have a rough idea of the performance and features of the top cordless grinders on our website. If we've got a demo of the grinder in action, you'll be able to see it on Toolstop TV.

What to look out for

Look out for the maximum size of grinding disk that you can fit, the top speed that it'll spin the disks, any special features related to protecting you - and the tool - from misuse, and the sort of batteries the grinder is compatible with.

what's the best cordless grinder

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While cordless grinders have perhaps been viewed as tools that you only use if you've got a very quick job to undertake, such as a couple of cuts, or to quickly deburr some material, nowadays you can expect them to perform like corded grinders. Up to a point...

The capacity of the batteryyou'll be using in your cordless grinder is important. Clearly the motor in the grinder is going to need to draw lots of juice from the battery pack, so the higher the capacity of the battery is important.

Obviously if you've got a few 18v li-ion batteries kicking about, buying a naked (or body only) grinder might be more cost effective as you'll be able to slap in a battery, while your others are charging. Click here for our guide to buying naked power tools.


Using a grinder carries some level of risk.

You're operating a machine that will be spinning an abrasive disk or cutter at extemely high speeds. You need your cordless grinder to be in asbolute control over the electronics of the motor. The electronics should be constantly monitor the motor - and the battery - to makes sure you, the operator, are not putting undue stress on either.

Click here for our guide to understanding the capabilities and limitations of the discs you'll be fitting to your grinder.

how to choose a cordless grinder

Working the grinder too hard could result in the disk shattering, the motor jamming or other such mechanical failures.

With this in mind, your ginder should be equipped with some sort of diagnostic system, whether it's as simple as a fan that keeps the motor cool while you work, or a more sophisticated system such as electronic limiters, electronic motor protection or themal overload cut out, each of which are intended to keep you - and your investment - safe will you grind or cut.


Check out the cordless grinders we're recommending for 2016.

Makita DGA505Z Angle Grinder

Makita DGA505Z Angle Grinder 18v Brushless Motor. Body-Only - SHOP HERE



Key Spec:

  • No Load speed: 8,500 rpm
  • Disc size: 125mm
  • Safety Paddle Switch
  • Compatible with Makita's 18v 3Ah, 4Ah  & 5Ah batteries
  • Weight: 2.6kg

Benefits:

  • Brushless motor
  • Equipped with Battery protection circuit
  • Capable of using wheels or discs for mains grinders
  • Anti-restart function
  • Electronic current limiter
  • Kickback user protection: Shuts down the tool to protect the user if rotation speed suddenly slow down


Bosch GWS18V-LI 18V li-ion Cordless Angle Grinder 115mm in L-Boxx (2 x 4Ah Batteries)

Bosch GWS18V-LI 18V li-ion Cordless Angle Grinder 115mm in L-Boxx (2 x 4Ah Batteries)



Key Specs:

  • No Load speed: 10,000rpm
  • 4 brush motor
  • Cutting depth: 30mm
  • Disc size: 115mm
  • Spindle: M14
  • Supplied with 2x 4Ah CoolPack batteries providing longer run-times and longer battery lifetime
  • Weight: 2.3kg

Benefits:

  • Another fast and capable grinder, outputting up to 10,000rpm
  • 4 brush motor provides very high performances levels
  • Electronic Cell Protection for 400% longer lifetime
  • Electronic Motor Protection shuts down the motor in overload situation
  • Includes a "bullet-proof" guard and two-movement safety switch


Bosch GWS18-125V-LI 18V li-ion Cordless Angle Grinder

Bosch GWS18-125V-LI 18V li-ion Cordless Angle Grinder, L-Boxx & 2x4Ah Batteries. SHOP HERE



Key Specs:

  • Disc size: 125mm
  • No load speed: 10,000rpm
  • Cutting depth: 35mm
  • Spindle: M14
  • Supplied in a Bosch L-Boxx, compatible with Bosch's 18v lithium-ion battery packs
  • Weight: 2.4kg

Benefits:

  • The larger disc capacity (125mm) allows for larger cutting depth
  • Electronic Cell Protection for 400% longer lifetime
  • Electronic Motor Protection shuts down the motor in overload situation
  • Includes a "bullet-proof" guard and two-movement safety switch
  • Ergonomic with slim grip and short length and only 2.4 kg

Hitachi G 18DBAL Angle Grinder 18V Cordless Brushless

Hitachi G 18DBAL Angle Grinder 18V Cordless Brushless - SHOP HERE

Key Specs:

  • Disc diameter: 115mm
  • No load speed: 9000rpm
  • Weight: 2.4kg
  • BODY-ONLY, compatible with Hitachi's 18v batteries

Benefits:

  • Brushless motor
  • Smallest body & grip circumference, most lightweight in its class
  • Dust and water-resistant construction that remarkably increases durability
  • Electronic control - Kickback protection system, anti-restart protection and soft start


Metabo W18LTX 115/125mm Cordless Power Extreme Grinder (2 x 5.2ah Batteries)

Key Specs:

  • Disc size: 115mm or 125mm
  • No load speed: 8,000rpm
    Spindle thread: M 14
  • Quick adjusting nut
  • Supplied with 2x 4Ah 18v li-ion batteries
  • Weight: 2.4kg

Benefits:

  • Metabo claim this cordless grinder will behave - and give you the same capabilities - as a corded grinder
  • Robust and wear-resistant motor featuring easy-access carbon brushes
  • Motor protection via thermal overload cut out and overload cut out features
  • Detachable dust filter
  • The battery pack can be rotated to allow you access to tight spaces



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In summary, then a cordless grinder may be the answer if you need to be independent from a power source while you work, but recognise that a cordless grinder won't give you the same amount of power or run times than a corded equivalent.

Safety must come first, so check to make sure your new cordless grinder has enough safety checks and balances on the motor and battery, and pay close attention to the power rating of the battery and the motor.

If you've got any questions about cordless grinder and the range we stock, let us know in the comments or on Facebook.


Comments

Rickert on Thu, 27 Nov 2014 21:20:49 +0000 (Likes: 0 / Dislikes: 0

The grinder that has been missed on the list is Hilti's cordless grinder AG125-A22 working on a 22v/3.3Ah battery, which charge from flat to full in under 32min.


holeag82 on Mon, 25 Nov 2013 01:57:20 +0000 (Likes: 0 / Dislikes: 0

Choosing the right cordless angle grinder is dependent on what life of battery, disc size, and power you will be needing to accomplish the job at hand.


unuuk on Sat, 19 Jan 2013 19:30:11 +0000 (Likes: 1 / Dislikes: 0

ive got the DEWALT 18 VOLT XR LITHIUM 3AH grinder, works a treat !


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