Cast Iron Surface Plates / Tables
JASH Cast Iron Surface Plates and Tables serve as a precision reference base for inspection, tool making, gauging, spotting, marking and layout operations. Stands enable proper leveling of plate and help provide the top surface at a convenient working height of approx. 850 to 900 mm from the floor.
- Surface Plates are made generally as per IS:2285-1991, DIN:876 and BS:817
- Made from close grained plain cast iron conforming to Grade FG: 220 of IS: 210-1978.
- Castings are stress relieved.
- Flatness deviation of any local area of 250 mm x 250 mm of working surface not exceeding 0.003 mm for plates of Grade 0, 0.007 mm for plates of Grade 1, 0.015 mm for plates of Grade 2, 0.030 mm for plates of Grade 3.
- Hand scraped surface finish for Grades 0, 1 and 2 flatness accuracies. Smooth machined / rough ground / rough scraped surface finish for Grade 3 flatness accuracies.
- Bearing area not less then 20 percent for Grade 0, 15 percent for Grade 1 and 10 percent for Grades 2 and 3.
- Flatness accuracy checked by Electronic level. Computer print out of the contour of top working surface is furnished.
- Plates up to 630 x 630 mm provided with handles for lifting. Larger plates provided with cored holes in peripheral ribbings for lifting by mechanical means.
- Column type Cast Iron Floor Stands or Steel fabricated stands with leveling screws supplied at extra charge, if required.
- Provided with rexene cover for top surface protection.
- Special features like grid grooves for location, tapped holes, heli-coils and T-slots can be provided on working surface, if required, at extra charge
Size in mm |
Tolerances on overall deviation from flatness in microns as per Indian Standard IS: 2285-1991 |
Tolerances on overall deviation from flatness in microns as per DIN 876 |
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| L x B | Grade 0 | Grade 1 | Grade 2 | Grade 3 | Grade 0 | Grade 1 | Grade 2 | Grade 3 | |
| 160 x 100 | 3.0 | 6 | 12 | 25 | 5 | 12 | 23 | 46 | |
| 250x 160 | 3.5 | 7 | 14 | 27 | 5 | 13 | 25 | 50 | |
| 250x 250 | 3.5 | 7 | 15 | 30 | 5 | 13 | 25 | 50 | |
| 400 x 250 | 4.0 | 8 | 16 | 32 | 6 | 14 | 28 | 56 | |
| 400x 400 | 4.5 | 9 | 17 | 34 | 6 | 14 | 28 | 56 | |
| 630 x 400 | 5.0 | 10 | 20 | 39 | 7 | 16 | 33 | 65 | |
| 630 x 630 | 5.0 | 10 | 21 | 42 | 7 | 16 | 33 | 65 | |
| 1000 x 630 | 6.0 | 12 | 24 | 49 | 8 | 20 | 40 | 80 | |
| 1000 x 1000 | 7.0 | 14 | 28 | 56 | 8 | 20 | 40 | 80 | |
| 1600 x 1000> | 8.0 | 16 | 33 | 66 | 10 | 26 | 52 | 104 | |
| 2000 x 1000 | 9.5 | 19 | 38 | 75 | 12 | 30 | 60 | 120 | |
JASH have manufactured and supplied large number of big size Surface Plates / Tables in India as well as for Exports. More than 500 numbers JASH Cast Iron Surface Plates of 3000 X 2000 mm unit size and 250 numbers 4000 X 2000 mm unit size made from one piece casting are being used by various industries in India and abroad. Some of the large size JASH Cast Iron Surface Plates made from one piece castings, under use with various clients in India, are as under:-
- 3500 X 2500 mm Bharat Earth Movers Ltd., Mysore
- 3500 X 2500 mm Bharat Heavy Electricals Ltd., Trichy
- 3500 X 2500 mm ssBhabha Atomic Research Centre, Trombay
- 3000 X 3000 mm Tata Robins Frazer Ltd., Jamshedpur
- 4000 X 3150 mm Cochain Shipyard Ltd., Cochin
- 5000 X 2000 mm Diesel Components Works, Patiala
- 6000 X 1000 mm Heavy Vehicles Factory, Chennai
JASH also makes yet larger sizes in multi piece construction by employing more than one individual Surface Plate assembled and mutually aligned together to obtain a larger made-up size. Some of such large made-up sizes supplied to various clients, are as under :-
- One set of 12000 X 9000 mm made - up size supplied to M/s. Bharat Heavy Electrical Ltd., Haridwar, comprised of 18 nos. Surface Plates each of 3000 X 2000 mm unit size.
- One set of 12000 X 12000 mm made - up size supplied to M/s. Bharat Heavy Electrical Ltd., Bhopal, comprised of 18 nos. Surface Plates each of 4000 X 2000 mm unit size.
- Two set of 10000 X 12000 mm made - up size supplied to M/s. L&T Mitsubishi Turbo Generators Ltd, Hazira, each comprised of 15 nos. Surface Plates each of 4000 X 2000 mm unit size.
- One set of 8000 X 6000 mm made - up size supplied to M/s. L&T Mitsubishi Turbo Generators Ltd, Hazira, comprised of 6 nos. Surface Plates each of 4000 X 2000 mm unit size.
- Two sets of 9000 X 4000 mm made - up size supplied to M/s. Bharat Earth Movers Ltd., K.G.F., Karnataka. Each set comprised of 6 nos. Surface Plates each of 3000 X 2000 mm unit size.
- Two sets of 5000 X 4000 mm made-up size supplied to Heavy Vehicles factory, Avadi, Chennai. Each set comprised of 2 nos. Surface Plates each of 5000 X 2000 mm unit size.
- One set of 8000 X 2000 mm made-up size comprising of 2 Nos. Surface Plates each of 4000 X 2000 mm unit size supplied to Ordnance Factory Project, Medak., Andhra Pradesh.
- One set of 6000 X 3000 mm made-up size supplied to Diesel Components Works, Patilala, comprising of 2 Nos. Surface Plates each of 3000 X 3000 mm unit Size.
- One set of 4000 X 4000 mm made-up size comprising of 2 Nos. Surface Plates each of 4000 X 2000 mm unit size supplied to Polar Satellite Launch Vehicle Project, Vikram Sarabhai Space Centre, Trivandrum.