Do I Need a Variable Speed Belt Grinder or a Fixed Speed Belt Grinder?
Variable vs. Fixed Speed Belt Grinders
If you’re stuck trying to decide if a variable speed belt grinder or a fixed speed belt grinder is right for you, you first need to know what your applications are and what your projects will require. Variable speed belt grinders and fixed speed belt grinders are specifically designed for different purposes, so selecting the wrong one for your operation can cause increased project time, inefficient grinding, or damage to your material.
Here are the differences between variable speed belt grinders and fixed speed belt grinders you need to consider before purchasing.

Differences Between Variable Speed Belt Grinders & Fixed Speed Belt Grinders
Variable and fixed speed belt grinders each have their own unique characteristics and ideal applications. Knowing the differences between them and what your project requirements are will help you determine which machine best meets your needs and preferences for grinding your part.
5 Variable Speed Belt Grinder Characteristics & Features
Variable speed belt grinders allow the operator to have more control over the speed of the belt. This is an essential step in detailed shaping, finishing, polishing, or specialized applications. The operator can quickly and easily adjust the grinder’s belt speed depending on the part’s requirements or the step in the grinding process. See below to learn more and understand about the specific differences in variable vs. fixed speed belt grinders.
Variable speed belt grinders differ from fixed speed belt grinders in five key ways:
1. Versatility
Variable speed belt grinders offer versatility in terms of adjusting the speed according to the specific task at hand. Different materials, grinding applications, and finishing requirements may necessitate different belt speeds. Being able to adjust the speed allows for more precise control over the grinding process.
2. Customization
Operators can tailor the speed to match the type of material being worked on, ensuring optimal performance and results. For instance, slower speeds might be preferable for finer finishing work, while higher speeds might be necessary for faster material removal.
3. Heat Management
Certain materials, such as metals, can generate significant heat during grinding. Variable speed control allows operators to reduce the belt speed to mitigate heat buildup, which can help prevent overheating and damage to both the material and the grinder.
4. Safety
In some cases, slower speeds might be safer, especially for beginners or when working on delicate materials. Variable speed control provides the flexibility to adjust the speed to a level that is comfortable and safe for the operator. It also incorporates braking capabilities which allow the machine to stop much faster and not coast to a stop.
5. Variable Frequency Drives
VFDs are energy efficient and allow for dynamic and regenerative braking of grinders and polishers. VFDs also provide line protection against overloads, are GFCI compatible, reduce startup amperage, and satisfy NFPA 79 by not automatically restarting after a power failure.
3 Fixed Speed Belt Grinder Characteristics & Features
Fixed speed belt grinders are just that, a grinder that can be used to shape, deburr, grind, and polish a part, operating at a constant and continual speed. Fixed speed belt grinders do not offer operators the ability to adjust the belt speed, or surface feet per minute (SFPM). Depending on the material you’re grinding, there are recommended grinder SFPM speeds that should be used to ensure proper operation. Make sure you fully understand your application requirements so you can select the ideal grinder for your purposes.
Fixed speed belt grinders differ from variable speed belt grinders in three key ways:
1. Simplicity
Fixed speed belt grinders are typically simpler in design and operation. They may be preferred in situations where the operator does not require variable speed functionality or prefers a straightforward, no-frills approach.
2. Cost
Fixed speed belt grinders tend to be more affordable than their variable speed counterparts. If budget is a significant consideration, opting for a fixed speed grinder may be more economical.
3. Consistency
Some operators may find fixed speed grinders more suitable for repetitive tasks where a consistent speed is desired. Once set, the speed remains constant, which can be advantageous for maintaining uniform results across multiple workpieces.
Variable & Fixed Speed Belt Grinders
Burr King offers a range of variable speed belt grinders and fixed speed belt grinders to meet every application need. Having an in-depth understanding of your grinding needs and project applications will ensure you select the correct grinder type. With over 70 years of experience in our industry, our team has the knowledge and understanding to work with you to help you determine which Burr King belt grinder will meet your needs.
Want more information on the types of belt grinders we offer? Contact us today!