How Does a Surface Grinder Work?

Basics

A surface grinder is a device that is used to accurately and intricately remove unneeded layers from a surface in an effort to smooth the target layer. The reason that a surface grinder is used is that it provides a great level of accuracy and detail that is sometimes difficult to achieve by hand. The use of a surface grinder is concentrated in heavy industry, especially in the automotive industry. Surface grinders are used on various types of metal and woods. The surface being worked on is directly related to the blade being used as they are specialized for different surfaces. This is a better option than trying to grind a surface by hand as it is less time consuming.

 

The amount of time it takes to grind a surface depends on the skill of the user and the surface being ground. The best safety guideline with a surface grinder is to take your time. Most accidents happen by using the wrong blade with the wrong material or running the blade on the grinder faster than the speed it was meant to run at. A surface grinder can be used to prepare surfaces such as floors and sheet metal for cars.

 

How It Works

The typical surface grinder has a table that is capable of moving forward and backward as well as side to side. When moving side to side, the table uses hydraulics to move. The machine also has a grinding wheel that rotates and has an adjustable height. The grinding wheel is generally made of diamond, aluminum oxide, silicon carbide or cubic boron nitride. The majority of surface grinders used in the modern era are at least partially automated. The work material is held on the table of a magnetic chuck and sometimes an electro-magnetic chuck depending on the specific machine.

 

What a Surface Grinder Does To Material

A surface grinder produces a high level of heat which will create stress on the material. After being run through a surface grinder, a material will be more apt to breakage or fracture than before it was run through the machine. A material can also lose its magnetic properties if its temperature is raised too high.

 

Tong Yi Machinery Inc. is the professional surface grinders manufacturer in Taiwan. Kinds of surface grinding machine series all can be provided by them. If you need further details about surface grinders, welcome to browse Tong Yi’s website or contact with them via email or telephone!

 

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How to Use a Surface Grinding Machine

A surface grinding machine is used to produce a smooth accurate finish on either metallic or nonmetallic materials. It uses a round rotating abrasive grinding wheel that remains stationary (but rotating) while the feed table (with work attached) is run in a reciprocating motion (left and right) under the grinding wheel. The specific amount of material to remove is determined by lightly touching off on the work with the grinding wheel rotating and feeding the grinding head down a certain distance.

 

WARNING: If a grinding wheel is permitted to exceed the maximum safe speed, it may disintegrate and cause injury to the operator and damage to the grinding machine!

 

On a Manual Surface Grinder, you will then need to run the table left and right with one hand wheel while cross-feeding with the other hand wheel.

 

On an Automatic Surface Grinder, you will then be able to run the table left and right automatically while cross-feeding automatically. All you need to do is set the down feed and stroke.

 

Typically surface grinders can grind within .0001 – .0002 but not all surface grinders are created equal. The less expensive models may not hold up to tool room accuracies but could be used effectively to sharpen punches, dies or do repair shop work. The more expensive models will use higher quality spindle bearings and other components and will be better able to attain tool room accuracies.

 

To use the surface grinding machines, you must select the correct grinding wheel for the work to be ground. There are different wheels that are best suited for grinding:

 

  • High Speed Steel RC 50-68
  • 400 Series Stainless
  • Soft Steels RC 30-45
  • 300 Series Stainless
  • Cast Iron: Ductile & Gray
  • Nonferrous Alloys

 

In each of the categories above you will need to determine wheel type by deciding if you need heavy (> .004), moderate (.002-.004) or light stock (.001) removal characteristics. Also, you will need to select a Grit size. 46 grit being for general purpose, 60 grit for commercial finish, 80 grit for fine finish and 120 grit for very fine finishes.

 

After selecting the correct wheel for your job, visually inspect the wheel for any damage or cracks. If no damage is found install the wheel on your surface grinder, tightening the left-hand spindle nut carefully with a spanner wrench. Make sure you replace the guard covering the wheel, put safety glasses on then turn the spindle on. Step away and let the spindle run for 1 minute to make sure the grinding wheel is running smoothly.

 

Once the grinding wheel has been dressed it is not recommended to turn the spindle off because turning off the spindle will require the wheel to be dressed again for some concentricity will be lost.

 

You are now ready to dress the wheel using a single point diamond dressing tool that is placed and held down by the magnetic chuck. A small amount of grinding wheel should be dressed off of the diameter in order to make the wheel run concentric. Place the diamond dresser under the rotating wheel and bring down the grinding head carefully so it just touches the dresser. Sweep the diamond dresser across the rotating wheel using the cross feed (y-axis). Feed the grinding head down .002 then sweep the diamond dresser across the rotating wheel. Repeat until the grinding wheel face is clean and running concentric.

 

After the wheel is dressed and running concentric you will then be ready to gently touch off on the work (using the spark or layout fluid method). Next, set your “zero” on the down feed handle, raise the head slightly to clear work then the cross feed handle to distance the work from the grinding wheel. Next feed the grinding head down a distance not more than .005. The amount of material being removed will determine how far you can feed the cross-feed in per pass.

 

The benefits of surface grinding are:

  • You can grind very hard or abrasive materials
  • High degree of dimensional accuracy
  • Produces surface textures of very high finish
  • Tooling is less expensive
  • Work holding is easier because of magnetic chuck
  • Can be done automatically

 

In short, you will most likely need a surface grinder if you need to provide precision ground surfaces, either for a high surface finish or attaining critical dimensions.

 

Joen Lih Machinery, the professional and leading manufacturer of surface grinding machine located in Taiwan. Our surface grinding machines are including semi-auto precision series, hydraulic series and auto down series. All Joen Lih precision surface grinding machines provide as standard equipment an electrically driven automatic lubrication system, we provide you the stable, safe and high efficiency surface grinding machines. Learn more products information, welcome to visit the website of Joen Lih and feel free to contact us.

 

 

Article Source: http://www.americanmachinetools.com/how_to_use_a_surface_grinder.htm

 

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How to Choose the Right Surface Grinder

An electrically operated high speed hand held surface grinder is usually employed in grinding the rough surfaces of metal or wooden objects till they become smooth or look ‘polished’. The desired results are achieved because of the grinding wheel, which is attached to the spindle of the grinder. And so, the surface grinder you need will depend largely on the material that needs grinding. For instance, if any metal surface needs grinding, the grinding wheel should be made of a highly abrasive material, and it should have numerous cutting niches embedded in it. On the other hand, for grinding a wooden surface, what you need is a lesser abrasive wheel.

Surface Grinder – The Types

There are two basic types of surface grinders, and they are:

  • The Planer-type
    • The Rotary-type

In the Planer-type, the grinding wheel remains stationary, while the worktable moves in a back-and-forth motion. This movement is controlled either manually or through some hydraulic drive system. These grinders are selected when overall grinding is required once the machine component has left the foundry.

In the Rotary type, the grinding wheel rotates, as does the circular worktable. These grinders are selected when the precision machine parts require grinding, before being fitted into its housing. In both the surface grinder types, the safety hazards are well taken care of, and because of this, accidents rarely happen.

Hand Held Surface Grinders
Hand held surface grinders are mostly used by carpenters or machine shop assistants. But they come with several risks for the user. First of all, flying debris loosened by the grinder can hit the user at a tremendous force, and this can of course cause physical injury. In rare instances, the user may also be blinded if any flying trash hits the eye. Therefore, people who use these grinders must wear suitable uniform to protect them from the debris. It is also essential to wear goggles for eye safety.

Things to do After a Surface Grinding Job Is Over
After a surface grinding job is over, the entire work station should be cleared of debris. If the work was done on a wooden material, the saw dust may be supplied to those who make composite boards, while the shavings from the metal surface can be sent to steel mills for melting.

However, what matters most is the safe clean-up of the work area, as otherwise, someone might get injured from carelessly thrown bits of metal shavings. Also, the surface grinder needs attention after each operation. It should be checked for any flying debris that blocks its air vents or any damage caused to the moving parts.

Get the complete information on choosing the right Surface grinder [http://www.thesurfacegrinder.com/] for your use. Visit the website to learn more.

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