What are the grades of cast iron surface plate?

GMT CAST IRON SURFACE PLATES

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GMT Cast Iron Surface Plates are the result of many years of experience as a manufacturer both in foundry technology and metrology. These plates are of close-grained cast iron. They are amply ribbed to minimize deflection under load. Also, the composition of the metal, the depth and cross-section of the ribs, and the thickness of the plate are designed to conform to the deflection limits specified in IS--. Also, we can finish plates to your choice of standards, such as DIN, JIS, BS, or ASME.

AVAILABLE GRADES

GMT Cast Iron Surface Plate is available in three grades: Grade-0, I & II, as per IS--. As already mentioned, we can make them to other standards on request. Grade-I & Grade-II plates are artificially seasoned.

Grade-II plates are accurately machined on a GMT Flat Lapping Machine to get the requisite flatness.

Grade I plates are hand-scraped to achieve minimum local deviation from flatness as per standard at any point on the working surface.

Furthermore, we use a special scraping technique to achieve a uniform distribution of load-bearing points and oil pockets. This finish scraping technique ensures that the area of the load-bearing points increases after the initial dulling of the high points. This results in an average of 15-20% load-bearing points after finish scraping. Otherwise, the component will stick to the plate and be hard to move. For that reason, the special scraping guarantees a long working life, at the required accuracies.

STANDARD ACCESSORIES

We provide handles on plates of sizes x 630 mm and smaller. Also, we provide a wooden cover to protect the working surfaces.

OPTIONAL ACCESSORIES

1: Fabricated Stands

Fabricated heavy angle iron stands with leveling screws are offered for all plates to provide convenient working height.

2: Cast Iron Column Floor Stands

Besides, we offer cast iron column floor stands, each with a set of levelling screws and nuts as an option.

For sizes up to x mm plate: One set of 5 & 3 for levelling screws and nuts and 2 for support.

For sizes above x mm: One set of 7 & 5 for levelling and two for support.

Finally, to meet special requirements, we offer custom size cast iron surface plates on request. So, multiple plates are assembled, for sizes above × mm, with fabricated heavy angle iron stands and bedplates with special cast iron floor stands.

PRECISION CAST IRON SURFACE PLATES &#; SPECIFICATIONS

Maximum deviation from flatness over the entire area expressed in μm (micrometres) as per IS &#; .

SIZE (mm)GRADE &#;0&#;GR &#;1&#;GRADE &#;2&#;WEIGHT (kg)300 x . x . x . x . x . x . x . x . x . x . x . x . x . x . x . x . x . x . x .

Surface Metrology specify the function of the surface. The important parameter is surface roughness.In manufacturing industries, a surface must be within certain limit of roughness.

Video of Surface Plate

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Therefore, measuring surface roughness is vital to quality control of machining a work-piece.

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By Surface Measurement, we can predict the performance of the component and control the manufacturing process.  

Basic Terminology in Surface Measurement

Flatness

Flatness is define by the distance between peak and depth point of surface plate.

Rigidity

It is the property of a solid body to resist deformation.

Leveling

It is the process of Level the table by it&#;s support system.

Grade-00 surface plate

Types of Surface Plate

According to Material used, There are three types of Surface Plate

1. Granite Surface Plate(IS ,ISO -2)
2. Cast Iron Surface Plate(IS ,ISO -1 )
3. Glass Plate(IS )

Granite Surface Plate

Granite surface plate have more rigidity for the same depth with the absence of corrosion. They provide a high modulus of rigidity and are moisture free.

Metallic objects like manufactured components/jobs can easily slide on their surface. The usual range available from 400*250*50 mm to **250 mm.

Grading System

Grade-00 (Prefer for Metrology laboratories ) Grade-0 (Prefer for General work in Quality Control)Grade-1 (Prefer for tool room)Grade-2 (Used for Shop Flore)Grade-3 (Also, used for shop Flore depend upon needs of customer )

Cast Iron Surface Plate

Cast-Iron surface plates used after rough machining is done followed by seasoning for suitable period. Then, heat treatment for relive the internal stress.

CI Surface table

The accuracy of this surface plate is +/- 0.002 mm to +/-0.005 mm for the surface plate diagonal of 150 mm.

CI surface plate available in 2 grades,

Grade-1 (Maximum flatness is 5 microns for 300mm*300 mm plate)

Grade-2 (Maximum flatness is 20 microns for 300mm*300 mm plate)

Glass Surface Plate

Glass surface plate commercially available. These are comparatively light in weight and free from burr and corrosion.

Accuracy varies in the range 0.004 to 0.008 mm. They are available in size of 150mmx150mm to 600mm*800mm.

Measurement of Surface roughness

Inspection and assessment of surface roughness of machined work-piece can be done by different measurement techniques.

1. Pocket Surf
2. Electronic Level

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