What is Grinding

Here’s some basic knowledge about grinding and TDC ‘s grinding examples.

What is grinding

“Grinding is performed as a process after” cutting “such as lathe and milling.
Grinding is a process of scraping the surface of a product using a grindstone, so it can be regarded as one of the cutting processes. There are various methods such as “surface grinding”, “inner surface grinding”, and “cylindrical grinding”, all of which enable removal processing with high dimensional accuracy. Another feature is that even extremely hard products such as hardened steel, cemented carbide and ceramics can be processed efficiently. On the other hand, there are also disadvantages such as it takes time to change the shape and remove the removal allowance.

TDC’s Grinding

Accumulating our unique know-how, we have established the world-class polishing processing techniques in the field of ultra-precise lapping/polishing. TDC offers one-stop shopping for complex parts and components requiring machining, grinding, lapping, and polishing applied to various shapes and materials.

  • Flexibility to work with our customers from prototypes and R&D to full production.
  • Offering one-stop shopping for all processing such as machining and shaping, lapping, polishing.
  • Applying wide variety of materials from soft resin to hard sapphire.

What we can do with grinding

“We have a track record of surface plate production, surface plate correction processing, shape cutting processing, etc.


Metals Stainless Steel / Superalloy / Copper / Titanium / Aluminum / Molybdenum / Tungsten/ Nickel / Tantalum etc.
Ceramics Al2O3 / ZrO2 / SiC / Si3N4 / SiO2, Also Coating and Plating are acceptable.
Crystalline Material BK7/ Crystal/ PYREX/ Quartz / Si/ SiC /GaN/ Sapphire
Resin Engineering Plastics / PEEK/ PMMA /PEFE

Processing Achievement

Thickness Tolerance ±0.1 um
Position Accuracy
±0.5 um
Perpendicularity 0.5 um
Parallelism 0.1 um
Flatness 0.1 um
Surface Roughness Ra0.01 um
Straightness 1 um

Processing Facility

Processing accuracy that can be achieved by combined processing of cutting, grinding, and polishing

Production Capability

Equipment Size Quantity
Machining Center 400×200 2
Milling Machine 250×1,000 3
Lathe φ80 2
Lathe φ65 1
Lathe φ100 1
Lathe φ180 1

Flat surface Grinding Machine
(MAX 1500mm)

Equipment Size Quantity
Nagase 1500×600 1
Okamoto 600×300 1
Okamoto 600×400 1
Okamoto 600×500 1
Sanshin’s Rotary Polishing φ750 2

Slicing Machine

Equipment Size Quantity
Okamoto 420 200×350 3
Okamoto 3G 200×350 2

Processing Equipment

Feel free to contact us for any inquires.

Grinding method / principle

The grinding wheel used for grinding has a structure of” abrasive grains, “” binder, “and” pores. “
Abrasive grains (grinding stones), each of which has a role as a blade, make small cuts in the product to sharpen it, enabling surface treatment with extremely high dimensional accuracy.
Hard materials such as diamond wheels, GC grindstones, and WA grindstones are used for the grindstones used, making it possible to process hard materials that are difficult to cut.

surface grinding machine

Due to the structure of the surface grinding machine, there are various polishing methods depending on the product and how the grindstone is applied, such as “vertical axis type” with a vertical spindle, “horizontal axis type” parallel to the main axis, and “variable type”.

In either method, the attached grindstone is rotated at high speed to polish the product fixed to the grinding machine from various directions. In addition, since the outer circumference of the grindstone is used, the processing method is not related to the size of the target.

Internal grinding machine

Internal grinding is the method used to grind the inside of a hole of products.

It is divided into a normal type in which the target product and the grindstone rotate, and a planetary type in which the grindstone rotates in the product.
The feature is that the smaller the grinding tool used, the more it can be machined even with a diameter of several millimeters. On the other hand, since the grindstone rotates at high speed, it is necessary to use a tool that meets certain standards.

Cylindrical grinding machine

Cylindrical grinding is one of the methods adopted after lathe processing, also called a cylinder, and refers to the processing of cutting the outer diameter of a round product.
The purpose is to reduce the thickness of the object to be processed. Generally, a cylindrical grinding machine has a mechanism in which a product is fixed and rotated by a work spindle and a tailstock center, and at the same time, a grindstone is also rotated to grind. There is also a coreless grinding machine (centerless grinding) that is mainly used for machining thin pipes and pins and has no spindle.

Advantages and disadvantages of grinding

The advantage of grinding is that it is possible to obtain extremely high dimensional accuracy on the order of microns, and a smooth surface can be obtained. In addition, it is possible to cut difficult metals such as cemented carbide and difficult-to-cut materials, and even materials such as pottery. On the other hand, there are disadvantages such as not being able to handle complicated shapes on the machined surface, causing cracks due to the high temperature of the cutting point, and taking time to process.

Difference between grinding and polishing

Both are processed by scraping the surface, so they can be regarded as similar processing methods, but the processing methods themselves are very different.
Grinding is a method in which a disk-shaped grindstone is rotated at high speed, and when it comes into contact with the product, fine cuts are made and the surface is ground. On the other hand, polishing is a method in which abrasive grains are applied to polish the surface at a low speed. In a broad sense, they are all the same processing method, but there are differences in terms of the motion control method and the pressure control method.

Grinding service in TDC

Grinding is a machining method that requires you to select a machining method depending on the product to be machined.
TDC is familiar with each construction method and can propose the optimum processing method for products as well as grinding. TDC has accumulated unique technological development and know-how in various processing, and can handle all shapes. We can handle all the precision processing that our customers demand, so please feel free to contact us.

Feel free to contact us for any inquires.

Related page