The Best Variable Speed Electric Die Grinder: Buying Guide and Reviews

A die grinder is a power tool used for polishing, grinding, honing, and sanding materials like metal, plastic, and wood. It is a befitting tool for anyone looking for versatility and precision, whether they are old guards in the field or starters. With the vast range of functions, it can perform as well as its efficiency, you can never doubt the power of the grinder.

If you are looking for a variable speed electric die grinder, read through this review for insights. It covers our top five picks beginning with the editor’s choice, budget pick, and best value. It also has their specifications, key features and benefits, pros and cons, and a buying guide.

Our Top Picks for A Variable Speed Electric Die Grinder

Editor's Pick
Bosch DG355LCE 120-Volt...
Budget Pick
Gino Development 01-0855...
Upgrade pick
Metabo GE 950 G Plus...
Metabo GE710 Compact...
Bosch DG490CE 120-Volt...
Model
Bosch DG355LCE 120-Volt...
Gino Development 01-0855...
Metabo GE 950 G Plus...
Metabo GE710 Compact...
Bosch DG490CE 120-Volt...
Amperage
5.8
4.3
8.5
6.4
6.5
No load speed (RPM)
10,000 – 30,000
0 – 22,000
2,500 – 8,700
13,000 – 34,000
2,500 – 8,000
Power source
Electric-powered
Electric-powered
Electric-powered
Electric-powered
Electric-powered
Voltage
120V
120V
120V
120V
120V
Shank size (in)
1/4
1/4
1/4
1/4
1/4
Price
$247.99
$52.34
$339.99
$185.97
$354.11
Customer Rating
Editor's Pick
Bosch DG355LCE 120-Volt...
Model
Bosch DG355LCE 120-Volt...
Amperage
5.8
No load speed (RPM)
10,000 – 30,000
Power source
Electric-powered
Voltage
120V
Shank size (in)
1/4
Price
$247.99
Customer Rating
Budget Pick
Gino Development 01-0855...
Model
Gino Development 01-0855...
Amperage
4.3
No load speed (RPM)
0 – 22,000
Power source
Electric-powered
Voltage
120V
Shank size (in)
1/4
Price
$52.34
Customer Rating
Upgrade pick
Metabo GE 950 G Plus...
Model
Metabo GE 950 G Plus...
Amperage
8.5
No load speed (RPM)
2,500 – 8,700
Power source
Electric-powered
Voltage
120V
Shank size (in)
1/4
Price
$339.99
Customer Rating
Metabo GE710 Compact...
Model
Metabo GE710 Compact...
Amperage
6.4
No load speed (RPM)
13,000 – 34,000
Power source
Electric-powered
Voltage
120V
Shank size (in)
1/4
Price
$185.97
Customer Rating
Bosch DG490CE 120-Volt...
Model
Bosch DG490CE 120-Volt...
Amperage
6.5
No load speed (RPM)
2,500 – 8,000
Power source
Electric-powered
Voltage
120V
Shank size (in)
1/4
Price
$354.11
Customer Rating

Our Editor’s choice for the best variable speed electric die grinder is the Bosch DG355LCE 120-Volt.... As the name suggests, it guarantees the user versatility since its variable speed allows them to switch the speeds to fit each application. The tool also features a lock On/Off slide switch which allows the user to lock it when not in use or if they need it to run for extended time.

Variable speed electric die grinder reviews

1. Editor's pick: Hitachi NR90AES1 Framing Nailer 

(8)

Specifications

  • Amperage: 5.8-Amp
  • No load speed: 10,000 – 30,000 RPM
  • Shank size: 1/4- inch
  • Collet chuck: 1/4-inch
  • Power source: electric-powered
  • Voltage: 120V
  • Product dimensions: 14.75” X 4.0”
  • Components: 19mm wrench, 13mm wrench

Key Features

  • Variable speed dial (with six basic settings).
  • Hardened 1/4-inch collet.
  • Lock On/Off slide switch.
  • Service minder Carbon brushes.
  • Metal gear cover.

Features & Benefits

  • The Bosch Power Tools is designed with a variable speed control which allows the user to set their preferred and perfect speed for each application at hand.
  • It also features a hardened quarter inch collet which guarantees the tool to last for long and offer increased precision.
  • The tool has a lock On/Off slide switch. This allows for easy locking for extended usage.
  • The Bosch product is also fitted with service minder Carbon brushes for increased lifespan and less downtime. It also features an auto cut-off when the brushes need service.
  • The Bosch tool also allows the user to grind even in hard-to-reach places, all thanks to the extended spindle it features.
  • The tool is also designed with a Constant-Response circuitry which provides for a soft-start and overload protection, and also maintains constant speed under load.
  • Also, the tool has a directed air flow which diverts dust away from vital components while also extending the tool’s life.
  • The metal gear cover makes it more durable.

Pros

  • Does not pose overheating challenges.
  • Durable gear.
  • Features a variable speed control mechanism.

Cons

  • The motor is large and heavy which makes the tool heavier for continued use.

2. Budget Pick: Gino Development 01-0855 TruePower Heavy Duty Long Shaft Electric Die Grinder


(26)

Specifications

  • Amperage: 4.3-Amp
  • No load speed: 0 – 22,000 RPM
  • Speed ranges: 0 – 5,000, 0 – 6,500, and 0 – 8,500 RPM
  • Shank size: 1/4- inch
  • Collet chuck: 6.35mm
  • Spindle travel: 1-inch
  • Throat: 4-inch
  • Wheel diameter: 1 – 1/2-inch
  • Power source: electric-powered
  • Voltage: 120V, 60Hz
  • Wattage: 350

Key Features

  • Variable speed control.
  • Permanent magnet motor.

Features & Benefits

  • The TruePower Tools' product features a variable speed control mechanism which allows the user to switch to the most appropriate speed level per application.
  • The tool also features a lightweight design which makes it easy to move around and ease without fatigue.
  • Also designed with an all ball-bearing construction, the tool is made to last longer.
  • The product is also designed with a longer-than-typical shaft that lets the user reach even tight and cramped workspaces.

Pros

  • Lightweight and maneuverable design.
  • Durable all ball-bearing construction.
  • Packed with spare motor brushes and tools for bit installation.

Cons

  • Product not fit for fettling or heavy-duty die grinding works, especially on metals since the motor is a bit weak.
  • The On/Off switch is a bit stiff.
  • Runs hot after continued use.

3. Upgrade pick: Metabo GE 950 G Plus 8.5-Amp 950-watt High Torque Die Grinder

(10)

Specifications

  • Amperage: 5.8-Amp
  • No load speed: 2,500 – 8,700 RPM
  • Rated load speed: 7,200 RPM
  • Collet chuck: 1/4-inch
  • Collar diameter: 1 – 11/16-inch
  • Power source: electric-powered
  • Voltage: 120V
  • Wattage: 950 W (input) and 510 W (output)

Key Features

  • Thermal overload protection.
  • Spindle lock
  • Electronic safety cut-off feature.
  • Die-cast aluminum gear housing.
  • Auto-stop carbon brushes

Features & Benefits

  • The tool has a unique spindle lock which makes changing of accessories easy and quick using a wrench.
  • It also has a wide speed range (2,500 – 8,700 RPM) which makes it more versatile for use in grinding, bevelling and cutting metal, graining and polishing, sanding, edge finishing, and deburring.
  • The product also features a powerful LongLife motor with ratings of 950 watts of power, a rated load of 7,200 rpm and 27 inch-lbs of torque. All these features make it the ideal tool for multiple applications, whether light- or heavy-duty.
  • The tool is also designed with a hardened and ground 1/4" collet which ensures accurate balance and minimized run-out of accessories.
  • The product is also made with several advanced motor protection features. They include thermal overload protection, an electronic soft start, and electronic speed stabilization, all working together to ensure extended tool life.
  • The die grinder has an electronic safety cut-off feature that protects the user should the tool bind or snag.
  • It is also fitted with a side handle and a soft rubber grip ensuring the user gets complete control and comfortable grip and is also protected from excessive heat.
  • Restart protection: prevents unintentional start-up after power supply interruption

Pros

  • Powerful LongLife motor
  • Powerful debris-blowing fan.

Cons

  • The fan is considerably noisy.

4. Metabo GE710 Compact 13000 to 34000 Rpm 6.4-Amp Die Grinder


Sale
(36)

Specifications

  • Amperage: 6.4-Amp
  • No load speed: 13,000 – 34,000 RPM
  • Rated load speed: 24,000 RPM
  • Collet chuck: 1/4-inch
  • Collar diameter: 1 – 11/16-inch
  • Power source: electric-powered
  • Voltage: 120V
  • Wattage: 710 W (input), 430 W (output)

Key Features

  • Variable speed control thumbwheel.
  • Electronic safety shutdown.
  • Auto-stop Carbon Brushes.

Features & Benefits

  • The Metabo GE710 die grinder is a compact tool with a variable speed control mechanism. This ensures that the user can switch the speeds to fit the application at hand.
  • The tool also has an electronic safety shutdown mechanism which ensures the motor is shut down if the tool jams or stops unexpectedly.
  • Also, the product features a thermal overload protection which ensures it does not jam if overloaded.
  • The tool also features a hardened and ground collet chuck that allows for precise concentricity of the tool in use.
  • The grinder is also designed with a restart protection mechanism which prevents unintentional start-up whenever there is a power interruption.
  • It is also fitted with a Metabo LongLife motor that is also fitted with a dust protection system for prolonged service life.
  • The tool is also made with a precise collar for stationary use.

Pros

  • Powerful and high-speed motor.
  • Compact, slim, and handy design.

Cons

  • Some collet sizes may not be accurate.

5. Bosch DG490CE 120-Volt Die Grinder Variable Speed

Sale
(11)

Specifications

  • Amperage: 6.5-Amp
  • No load speed: 2,500 – 8,000 RPM
  • Collet chuck: 1/4-inch
  • Power source: electric-powered
  • Voltage: 120V
  • Product dimensions: 15.25” X 3.5”
  • Components: 19mm wrench, 13mm wrench

Key Features

  • Variable speed control.
  • Lock On/Off slide switch.
  • Service minder Carbon brushes.
  • Die-cast spindle housing
  • Extended spindle
  • Metallic gear cover.
  • Directed air flow.

Features & Benefits

  • The die grinder has a considerably longer slender front and length which makes reaching into deep spots easy.
  • The tool is also designed with a variable speed control mechanism which makes it easy to switch to the most fitting speed per application.
  • The metal gear cover ensures maximum durability.
  • The lock On/Off slide switch makes sure the user enjoys extended use without switching it off.
  • The product also has an extended spindle which allows for grinding even in difficult to reach places.
  • The Bosch tool is also designed with constant response circuitry which provides for a soft start and also maintains constant speed under load. The circuitry also provides overload protection.
  • The product is also designed with a directed air flow which diverts dust away from the tools’ vital components. It also helps to extend the tool’s life.
  • With the service minder brushes, the user enjoys minimized guesswork and stops the tool when preventative maintenance is required.

Pros

  • High torque gearbox.
  • Heavy-duty build.
  • Plenty of torque for heavy-duty task.
  • Considerably quieter
  • Longer slender front and length.
  • Semi-soft comfortable handle on the shaft.

Cons

  • The lock On/Off switch does not lock easily.

Buying Guide

It’s every workshopping professional or DIYer’s dream to get a versatile tool for grinding, polishing, sanding and honing materials such as metal, plastic, and wood. Coupled by a strong motor and variable speeds, an electric die grinder featuring such features would be a good catch. The versatility, precision, and ease of use such a tool offers are worth the investment one can put on it.

What is A Die Grinder?

Bosch DG355LCE 120-Volt...

A die grinder is a handheld power tool designed for different applications including sanding, honing, grinding, machining, and polishing various materials. The materials are typically metal, but it can also be used on plastic and wood. The tool got its name from the early archetypal applications that included tool and die work, and they were used for creating precise contours of dies or molds.

Die grinders are nowadays used for a myriad of cutting applications ranging from sculpture-like contouring of bar stock to grinding needs of fabrication.

Most users of the tool are boilermakers, welders, ironworkers, steel erectors, millwrights, and sheet metal workers like HVAC technicians and auto body workers. Die grinders are also used for engraving, head porting of cylinders, and the general shaping of parts.

Methods of Cutting Using A Die Grinder

The various cutting actions one can use a die grinder for include:

  • Honing with fine-grit mounted points.
  • Machining with a small drill bit, endmill, or burr.
  • Lapping with a lapping compound and mounted lap to embed it.
  • Grinding with bonded abrasive stones such as mounted points, mounted stones, or grinding points.
  • Sanding with coated abrasives like small drums that are made up of sandpaper mounted on expanding rubber mandrel.
  • Buffing or polishing with fiber or cloth drums or flaps and polishing compounds.

Picking the Right Too and Accessories

Getting the right tool and its proper accessories is vital in many ways. To begin with, it determines the performance of your tools and secondly, it determines whether your safety is guaranteed. Therefore, getting the right combination of tools and accessories will help to minimize risks of serious personal injuries.

1 4 inch die grinder variable speed electric

If the manufacturer’s instructions and user manuals are followed, the tools and their accessories will do their work safely and faster.

  • Use the right accessories for the die grinder. Check whether it fits the spindle and if it does not replace it instantly. If it does not fit, it may result in wobbling and vibrating and in return make you lose control.
  • Ensure you secure all die grinder accessories that use a collet.
  • Avoid over-tightening the spindle nut.
  • Only use the accessories for the recommended jobs.
  • Always follow the user’s manuals for every tool and accessories.

Things to Consider While Shopping for A Variable Speed Die Grinder

Before you can commit to buying any tool, there are some considerations that you must take. For most people, price is the top factor, but it is not the only one. As for a die grinder, the following factors can help you to make the right decision.

  1. Tool Size

The size of the die grinder mostly depends on the type of job that you have at hand. For instance, if you are looking for a tool to work on a small project or to polish a workpiece, you will not need a large-sized tool and the vice versa will be true.

  1. Speed Control

The variable speed electric die grinder’s name is speaking for it. If you are looking for one, your focus should be on how much control you will need for the particular application. If you want to grind surfaces such as plastic tubing and wood boards, a lower speed control would be better. If you are grinding a hard surface like a metal, a higher speed control will be your best bet.

  1. Power Source

Die grinders come as either cordless (battery-powered), corded-electric, or pneumatic. Choosing the right one to purchase depends on several variables. The key one, however, is getting what will work for you and will work with the current power sources that you have. How long you want to work without power failure, comfortability, and maneuverability are some of the variables to consider too.

  1. Motor Power

The more powerful a motor is, the better the performance. Therefore, you should decide what extent of power you need and choose the right tool with the fitting motor power.

Personal Protection and Safety Precautions While Using Electric Die Grinders

electric die grinder and variable speed control

As it is with all power tools and any other tool in a workshop, one must exercise caution while using a die grinder.  The common personal protection and safety precautions include:

  • Eye and Face Protection: - this is the most common PPE while drilling with most power tools. It also applies to an electric die grinder as using it produces enough sparks that need to be shielded from. If you are welding or torching, for example, you should go for safety goggles (these are safety glasses with side coverings) or a face shield (a polycarbonate window) that hangs on one’s head from a headband.
  • Skin Protection: - while working with most power tools, protecting the skin is important and should be by use of aprons and work gloves. In some applications, fire-retardant clothes are vital to keep you safe from sparks even though the sparks are mostly harmless.
  • Hearing Protection: - die grinders are often loud even when running unloaded. When it is loaded, it is extra loud, and you should shield your ears with headphones or earplugs
  • Protecting the Alimentary and Respiratory Tracts: - the tracts you should work on protecting are the lungs, throat, mouth, and gut. You can cover them from dirt and dust particles using a respirator if it’s a special application or simple paper masks.
  • Dress right: - avoid loose clothes and jewelry, and contain your hair. Loose clothes and hair can be easily caught in moving parts.
  • Have a clear working area: - a crowded and cluttered work area can be dangerous to work in as it may cause tripping and loss of balance.
  • Keep the Guard Intact: - you should avoid altering the guard or using the tool without a guard. You should make sure all guards are in place and are working properly before each use.
  • Keep off Flammable Materials: - an electric tool is quick to release sparks that may cause fire outbreaks especially if it comes into contact with electric conductors. You should, therefore, avoid working or operating the die grinder near flammable materials as the sparks may ignite them.

What is the Best Variable Speed Electric Die Grinder: Our Pick

Bosch DG355LCE 120-Volt...

Our editor’s for the best variable speed electric die grinder is the Bosch DG355LCE 120-Volt... The grinder is designed to deliver stronger performances and last longer. With a no-load speed of 2,500 – 8,000 rotations per minute, a strong 6.5-Amp motor, and a myriad of performance-enhancing features, the tool speaks for itself and fits most grinding, sanding, and cutting applications.

Gino Development 01-0855...

If you are looking for a more pocket-friendly option, we have our budget pick. The Gino Development 01-0855... is your asset if you are looking for a heavy-duty and top-performing tool without straining your pocket.

Metabo GE 950 G Plus...

The Metabo GE 950 G Plus... is our best value. If you are willing to spend an extra dime but still get the equivalent of it in a die grinder, Metabo has it for you. The tool features a thermal overload protection, high torque, spindle lock, and a hardened and ground collet chuck which ensures precise concentricity of the tools in use.

Last update on 2019-09-23 / Affiliate links / Images from Amazon Product Advertising API

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