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SG618 SG818 Manual Surface Grinding Machine
  • SG618 SG818 Manual Surface Grinding Machine
  • SG618 SG818 Manual Surface Grinding Machine

SG618 SG818 Manual Surface Grinding Machine

Grinding is used to finish workpieces that must show high surface quality (e.g., low surface roughness) and high accuracy of shape and dimension.
  • SG618 SG818 Manual Surface Grinding MachineDownload
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SG618 SG818 Manual surface grinding machine mainly adopts grinding steel, cast iron and nonferrous metals material besides the grinding wheel. Different clamping and positioning method may be adopted according to the material and shape of workpiece. The ground finish of general surface may adopt electromagnetic chuck or be fastened on the worktable directly; the ground finish of surface, right angle face, arbitrary angle, cylindrical face and other special shapes may adopt fixture or multi-function strong electromagnetic chuck.
Standard accessories
1. Coolant tank;              2. Grinding wheel chuck;              3. Balancing arbor;
4. Wheel extractor;           5. Leveling wedge and bolt;            6. Tool box and tools;
7. Standard grinding wheel;    8. Wheel dresser stand (not including diamond pen);
Optional accessories
1. Balancing stand;           2. Permanent magnetic chuck;
3. Dust collector;             4. Parallel wheel dresser;
Technical parameters of SG618 SG818 Manual Surface Grinding Machine
Main parameters Unit SG618 SG818
Max. width to be ground mm 165 (6.5”) 220 (8.7”)
Max. length to be ground mm 470 (19”) 470 (19”)
Max. height to be ground mm 350 (14”) 350 (14”)
Table size (L x W) mm 460x155 (18x6.1”) 450x210 (18x8.3”)
Permanent magnetic chuck size (L x W) mm 400x150 (16x6”) 400x200 (16x7.9”)
Max longitudinal travel mm 500 (20”) 500 (20”)
Max transverse travel mm 185 (7.3”) 240 (9.4”)
Max distance from spindle axis to table surface mm 450 (18”) 450 (18”)
Vertical hand feed per rev mm 1 1
Vertical hand feed per div mm 0.005 0.005
Grinding wheel size (OD x W x ID) mm Φ200x13x31.75
Grinding wheel spindle speed rpm 3450(60HZ); 2850(50HZ) 3450(60HZ); 2850(50HZ)
Grinding motor power kW 1.5 1.5
Max load of table (including permanent magnetic chuck)  kg 97 128
Machine weight kg 790 920
Overall dimension (L x W x H) mm 1330x1090x1680 1330x1150x1680
Packing size (L x W x H) mm 1153x1373x1920 1153x1413x1950

Surface grinding is used to produce a smooth finish on flat surfaces. It is a widely used abrasive machining process in which a spinning wheel covered in rough particles (grinding wheel) cuts chips of metallic or nonmetallic substance from a workpiece, making a face of it flat or smooth.

Surface grinding is the most common of the grinding operations. It is a finishing process that uses a rotating abrasive wheel to smooth the flat surface of metallic or nonmetallic materials to give them a more refined look by removing the oxide layer and impurities on work piece surfaces. This will also attain a desired surface for a functional 

SG618 SG818 Manual Surface Grinding Machine is composed of an abrasive wheel, a workholding device known as a chuck, and a reciprocating or rotary table. The chuck holds the material in place while it is being worked on. It can do this one of two ways: ferromagnetic pieces are held in place by a magnetic chuck, while non-ferromagnetic and nonmetallic pieces are held in place by vacuum or mechanical means. A machine vise (made from ferromagnetic steel or cast iron) placed on the magnetic chuck can be used to hold non-ferromagnetic workpieces if only a magnetic chuck is available.

Factors to consider in surface grinding are the material of the grinding wheel and the material of the piece being worked on.

Typical workpiece materials include cast iron and mild steel. These two materials don't tend to clog the grinding wheel while being processed. Other materials are aluminum, stainless steel, brass and some plastics. When grinding at high temperatures, the material tends to become weakened and is more inclined to corrode. This can also result in a loss of magnetism in materials where this is applicable.

The grinding wheel is not limited to a cylindrical shape and can have a myriad of options that are useful in transferring different geometries to the object being worked on. Straight wheels can be dressed by the operator to produce custom geometries. When surface grinding an object, one must keep in mind that the shape of the wheel will be transferred to the material of the object like a reverse image.

SG618 SG818 Manual Surface Grinding Machine with electromagnetic chuck, inset shows a Manual magnetic chuck

Surface Grinding machines
A Surface Grinding machine/Surface grinder consists of an abrasive wheel, a chuck (a workpiece holding device), and a rotary table. The chuck is used to hold the material in place while the wheel and object are rotated to produce a smooth finish.

Surface Grinding machine/Surface grinder, which has a head that is lowered to a work piece, which is moved back and forth under the grinding wheel on a table that typically has a controllable permanent magnet (magnetic chuck) for use with magnetic stock (especially ferrous stock) but can have a vacuum chuck or other fixture means. The most common surface grinders have a grinding wheel rotating on a horizontal axis cutting around the circumference of the grinding wheel. Rotary surface grinders, commonly known as "Blanchard" style grinders, have a grinding head which rotates the grinding wheel on a vertical axis cutting on the end face of the grinding wheel, while a table rotates the work piece in the opposite direction underneath. This type of machine removes large amounts of material and grinds flat surfaces with noted spiral grind marks. It can also be used to make and sharpen metal stamping die sets, flat shear blades, fixture bases or any flat and parallel surfaces. FORTUNE PACIFIC Surface Grinding machine/Surface grinders can be manually operated or have CNC controls.

A grinding machine, often shortened to grinder, is any of various power tools or machine tools used for grinding, which is a type of machining using an abrasive wheel as the cutting tool. Each grain of abrasive on the wheel's surface cuts a small chip from the workpiece via shear deformation.

Grinding is used to finish workpieces that must show high surface quality (e.g., low surface roughness) and high accuracy of shape and dimension. As the accuracy in dimensions in grinding is of the order of 0.000025 mm, in most applications it tends to be a finishing operation and removes comparatively little metal, about 0.25 to 0.50 mm depth. However, there are some roughing applications in which grinding removes high volumes of metal quite rapidly. Thus, grinding is a diverse field.

Overview of grinding machine
The grinding machine consists of a bed with a fixture to guide and hold the work piece, and a power-driven grinding wheel spinning at the required speed. The speed is determined by the wheel’s diameter and manufacturer’s rating. The grinding head can travel across a fixed work piece, or the work piece can be moved while the grind head stays in a fixed position.

Fine control of the grinding head or table position is possible using a vernier calibrated hand wheel, or using the features of numerical controls.

Grinding machines remove material from the work piece by abrasion, which can generate substantial amounts of heat. To cool the work piece so that it does not overheat and go outside its tolerance, grinding machines incorporate a coolant. The coolant also benefits the machinist as the heat generated may cause burns. In high-precision grinding machines (most cylindrical and surface grinders), the final grinding stages are usually set up so that they remove about 200 nm (less than 1/10000 in) per pass - this generates so little heat that even with no coolant, the temperature rise is negligible.
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