Metrology – Cast Iron Surface Plate

GMT Cast Iron Surface PlatesGMT CAST IRON SURFACE PLATE

GMT Cast Iron Surface Plate is the result of years 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 will 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

Plates of sizes 1000 x 630 mm and smaller, are provided with handle. A wooden cover is provided 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, cast iron column floor stands each with a leveling screw and nut are offered as an option.

For sizes upto 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.

S.No SIZE (in mm) GRADE “0” GR “1” GRADE “2” Weight (kg)
1 300 x 300 4.0 7 15 21
2 400 x 400 4.5 9 17 50
3 450 x 300 4.0 8 16 39
4 450 x 450 4.5 9 18 62
5 600 x 450 5.0 10 20 79
6 630 x 400 5.0 10 20 96
7 600 x 600 5.0 10 20 128
8 630 x 630 5.0 10 21 156
9 900 x 600 6.0 12 23 204
10 1000 x 630 6.0 12 24 271
11 1000 x 1000 7.0 14 28 514
12 1200 x 900 7.0 14 28 437
13 1500 x 1200 8.0 16 33 986
14 1600 x 1000 8.0 16 33 870
15 1800 x 1200 9.0 18 36 1188
16 2000 x 1000 9.0 18 37 1345
17 2400 x 1200 10.5 21 42 1683
18 3000 x 1000 12.0 24 48 1845
19 3000 x 1200 12.0 24 49 2085

Download technical brochure. 

Finally, please visit us at https://gmtmachinetools.blogspot.in – a new blog dedicated to all GMT customers…interact with our technical experts.

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