1. How many series of WYMA Air Grinders does it have? What styles, sizes, and dimensions are available? What are they commonly used for?

We supply WYMA® Pneumatic Grinders in bulk, designed and manufactured in China, including five main series: the Die Grinder, Angle Grinder, Pencil Grinder, Ultrasonic Grinder and Chamfering Machine. Each series delivers smooth high-speed operation with near-zero vibration, which makes them reliable even under demanding cutting conditions. They maintain a runout tolerance between 0.01mm and 0.03mm, a level of precision that stems from core components made of alloy steel, high-density fiber and ductile iron—materials that undergo mature CNC heat treatment.

The Die Grinder series is further divided into High/Low Speed Models,  Extended Model and Right-Angle Model, each accepting collets in 3mm or 6mm sizes. The High Speed Model suits for some common tasks such as quick deburring, general engraving and sanding wood. The Low Speed Model, which delivers larger torque at the lower RPMs, handles primary processing of heavy machinery parts and intensive grinding of hard materials. Thanks to its extended body, the Extended Model reaches into deep, narrow spaces like pipe interiors and grooves. The Right-Angle Model, fits into tight spots where access is limited—places like mold cavities and tight corners with its L-shaped design.

Angle Grinders come in sizes from 4 to 7 inches and compatible with both cutting discs and grinding discs, which gives them a dual purpose. You can use them for grinding and cutting metal or wood, and also for slicing tiles.

The Pencil Grinder series gives you a lot options: 90° or 120° Angle Style, 90° or 120° Grinding Disc style and Straight style. Besides common jobs like rust removal and weld seam cleaning, this serie's tools excel in cramped spaces where precision matters—applications that include micro-hole grinding and finishing in aerospace or precision instrument manufacturing. Artists and woodworkers also use them for delicate work such as jade carving, tile polishing, and shaping plastic.

Ultrasonic Grinders get their name from their reciprocating motion, which matches ultrasonic frequencies. You can choose between two operating modes: Back & Front Reciprocating or Left & Right Swing. They’re often the tool of choice for die polishing and stone polishing.

The Chamfering Machine series offers a choice between C-Type and R-Type tungsten steel blades—so be sure you know which material each blade type suits. It also allows precise adjustment of chamfer depth from 0.1mm to 0.9mm, making it a practical option for putting C-angle or R-angle chamfers on contours, grooves, and edges of various hard materials.

2. If I only purchase one WYMA Air Grinder, can I use it exclusively for my other grinding needs?

While the Angle Grinder and Chamfering Machine series may differ slightly and not suit certain specific needs, the other series are of course fully compatible! As you can see in the image below, we offer two sizes of chucks, a variety of interchangeable grinding heads, blades, cutting discs, and sanding discs, ensuring they're compatible with your specific product. Let WYMA help you achieve true multi-purpose use with one machine.

3. What are the main parameters of the Pneumatic Grinder? What do they reflect and represent?

Different series have their own key parameters, which is why we need to introduce each group separately.

For Die Grinders, Angle Grinders and Pencil Grinders, the main parameters are Free Speed and Collet Size. Free Speed refers to how fast the tool spins when it’s running with no load—we measure it in RPM. This speed determines both the rate at which material is removed and the level of aggression in the cut. What happens is that a higher free speed generally means you can work faster, though it may reduce cutting force; a lower speed slows the process but increases the force that the tool applies. Collet Size tells you what maximum shank diameter the grinder can grip. A larger collet size is what you need if you plan to use bigger grinding heads.

When we look at the Ultrasonic Grinder series, the key specification shifts to Reciprocating Stroke. This is the tiny linear distance—measured in mm—that the tip travels from one end of its movement to the other. A shorter stroke is what gives you a finer surface finish, which is why it works well for delicate polishing, creating mirror-like surfaces, removing very fine lines or microscopic burrs. On the other hand, a longer stroke means the tool takes off more material each cycle, which is how it handles jobs like rough deburring or pre-machining larger grooves in molds.

For Chamfering Machine, the main parameters are Chamfer Aperture, Adjustable Depth and Chamfering Capacity. Chamfer Aperture indicates the smallest hole or inner edge dia.—on items like tubes or round bars—where the machine’s blade can still operate. For example, a machine has a min Chamfer Aperture of 7mm, any opening smaller than that is where this chamfering machine simply won’t suit. Adjustable Depth is the range through which you can change how far the blade extends. Adjusting this is how you control the depth of the cut into the workpiece edge, which directly sets the width of the resulting 45° chamfer(Size of the two right-angled sides with a 45°chamfer). Chamfering Capacity indicates the largest chamfer size the tool can produce, usually described as a C-angle width (like C0 to C2) or an R-radius. This capacity defines the chamfering machine’s working range, and it’s the number that matters most when you’re choosing which model to use.

4. What should I do if I encounter abnormal jitter when using the Die Grinder?

In this case, the grinding head used may be of poor quality. We can choose to replace it with a grinding head with better quality, or we can use a grinding tool to trim the defective grinding head evenly and coaxially before using it.

5. Are these products in stock? What customization options are available?

Yes, all models shown on our website are in stock, and we support color and logo customization. Please feel free to discuss the required quantity and specific customization details with our professional service team.

6. What is WYMA's professionalism? How do you ensure the quality of your products?

At Foshan WYMA, we help clients with precision pneumatic tools. Founded in 1997, we have nearly three decades of manufacturing expertise. Our 23,000 sqm facility is equipped with advanced CNC systems, which we use to build custom and OEM/ODM tools. These products meet rigorous standards—like the EU MD-CE certification that all our air grinders hold—so you know they are safe and durable. We support what we sell with after-sales coverage in more than 30 countries.

7. How can I do to get the best price from WYMA quickly?

You can click "Send Inquiry" on the top of the product introduction page of our website to jump to the inquiry content form to send us an inquiry. Our staff will reply to you as soon as possible to communicate the details and tell you how to place an order. Alternatively, you can contact us through the following contact information.

For 24 hours contact details as below:

Email:

sales01@wymatools.com / sales03@wymatools.com

Tel / WhatsApp / Wechat:

+86-133 6036 8438 / +86-136 2252 8472