GMT 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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