Metrology Cast Iron Surface Plate

GMT Cast Iron Surface PlatesGMT CAST IRON SURFACE PLATE

GMT Cast Iron Surface Plate is 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-2285-2003. Also we can finish plates to your choice of standard, 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-2285-2003. As already mentioned, we can make them to other standards on request. Grade-I & Grade-II plates are artificially seasoned. Besides, we hands scrape the plate 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.

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

STANDARD ACCESSORIES

We provide handles on plates of sizes 1000 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 required leveling screws, are offered for all plates to provide convenient working height.

2: Cast Iron Column Floor Stands

In addition, we offer cast iron column floor stands each with a leveling screw and nut as an option.

For sizes up to 2000 x 1000mm plate: A set of 5 & 3 for leveling and 2 for support.

For sizes above 2000 x 1000 mm: A set of 7 & 5 for leveling 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 4000×1200 mm, with fabricated heavy angle iron stands and bed plates with special cast iron floor stands.

PRECISION CAST IRON SURFACE PLATES – SPECIFICATIONS

Maximum deviation from flatness over the entire area expressed in μm as per IS 2285 – 2003.

SIZE (in mm) GRADE “0” GR “1” GRADE “2” Weight (kg)
300 x 300 4.0 7 15 21
400 x 400 4.5 9 17 50
450 x 300 4.0 8 16 39
450 x 450 4.5 9 18 62
600 x 450 5.0 10 20 79
630 x 400 5.0 10 20 96
600 x 600 5.0 10 20 128
630 x 630 5.0 10 21 156
900 x 600 6.0 12 23 204
1000 x 630 6.0 12 24 271
1000 x 1000 7.0 14 28 514
1200 x 900 7.0 14 28 437
1500 x 1200 8.0 16 33 986
1600 x 1000 8.0 16 33 870
1800 x 1200 9.0 18 36 1188
2000 x 1000 9.0 18 37 1345
2400 x 1200 10.5 21 42 1683
3000 x 1000 12.0 24 48 1845
3000 x 1200 12.0 24 49 2085

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