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Inspection Equipments

 
CAST IRON SURFACE PLATES (MTC-502)  
Cast Iron Surface Plates

Nominal Sizes In mm

Maximum deviation from flatness over the entire are expressed in Microns as per IS 2285 -1963

Weight in kg (approx)

Grade -1

Grade - II

400 X 400

7.5

-

50

630 X 400

7.5

30

96

630 X 630

7.5

30

156

1000 X 630

10.0

40

271

1000 X 1000

12.5

50

514

1600 X 1000

17.5

70

870

2000 X 1000

20.0

80

1345

3000 X 1000

25.0

100

1845


Note : Other sizes are offered against specific request.

These plates are of close grained cast iron. They are amply ribbed to minimize deflection under load. 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 -1963.

Surface plates are manufactured to two tolerance standards. - Grade-I and Grade-II. Grade-I plates are more precise than Grade-II plates. The deviation in flatness for Grade-I and  Grade -II  plates for sizes upto and including 2000 x 1000 mm are as prescribed in IS 2285-1963.

Grade-1 plates are artificially seasoned.They are hand scraped to achieve maximum local deviation from flatness of 5 microns over any length of 300 mm at any points on the working face , in plates of  630 X 400 mm and larger. Aspecial scraping technique is used to achieve a uniform distribution of load bearing points and oil pockets. An average of 15-20 load bearing points , after finish scraping , is standard. This finish scraping technique ensures that the area of the load bearing points increases  after the intial dulling of the high points. This guarantees a long working life, at the required accuracies.

Grade-II plates are accurately machined to get the requisite flatness.

 
STANDARD ACCESSORIES
Plates of sizes 1000 X 1000 mm and smaller, are provided with handles. A wooden cover is provided to protect the working face.
 
 OPTIONAL ACCESSORIES
  1. Fabricated mild steel stands, with three leveling screws, are offered for plates upto and including size 1600 X1000 mm.
  2. Cast Iron Column Floor Stands, each with a leveling screw and nut, are offered as per the scheme.
    1. A set of five , three for leveling and two for support for 2000 X 1000 mm plate.
    2. A set of seven , five for leveling and two for support for 3000 X 1000 mm plate.
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