Jash Metrology

Nand Nagar, Indore, Madhya Pradesh

JASH Inspection Bench Centres are ideal for precision inspections and checking various parameters like concentricity, facial and radial run out etc. in tool room and machine shop. Get high quality precision bench centres from the leading manufacturer and supplier of precision tools.

• Made generally as per IS: 5980 - 1978.
• Cast Iron Base made from plain cast iron conforming to grade FG:220 of IS 210.
• Castings stress relieved as a precaution against distortion
• Precision Bench Centres with Granite Base are also offered, with metallic (Cast Iron) T-slots.
• One Centre is spring loaded for easy loading and unloading and also ensure uniform pressure on work piece.

• Roller guide attachment for heavy jobs.
• Stub Centres for inspection bench.
• Carbide Tipped dead centre.
• Taper and parallel test mandrels.
• Concentricity Checking Attachments for inspection bench centre.
• Steady rest for extra long and heavy jobs
• Sliding Fixture for mounting dial stand and magnetic base

• Standard Sizes:
  Admit between Centre (ABC): 300 mm, 500 mm, 750, 1000 mm, 1250 mm, 1500 mm, 1750 mm, 2000 mm, 2500 mm and 3000 mm.Height of Centre (HC): 125 mm, 160 mm, 200 mm, 250 mm and 300 mm.
• Other sizes can be offered on request.

These are used mainly for gauging, inspection, squareness testing & for checking three axis geometric accuracies of machine tools.

• Made from close grained Cast Iron Casting conforming to Grade FG-220 of IS-210 (equivalent to GG20 / FT20 / 30-A). Higher grades also offered on request.
• Casting duly stress relieved.
• All the faces offered duly hand-scrapped finish. Also offered in lapped finish upon request.
• Finer accuracies can also be achieved on request, at extra cost.
• Teak-ply storing case provided on request, at extra cost.

JASH Master Cylinders / Cylindrical Squares provide most reliable reference standards for checking of squareness of vertical axis with reference to horizontal axis.

• Made from good quality alloy steel, heat treated for maximum stability and wear resistance.
• Periphery precision ground and lapped to a fine surface finish.
• Made generally as per IS-6952.
• Ends are recessed and have lapped finish.
• Provided with teak ply storing case on request at extra cost.
• Stands if required supplied at extra cost.

These are used for truing, spotting and reconditioning of dovetailed guide ways of machine tools, slides and similar work pieces.

• Made from close grained plain cast iron conforming to Grade FG; 220 of IS: 210 (equivalent to GG20 / FT20 /30-A). Higher grades also offered on request.
• Casting stress relieved to remove internal stresses.
• Provided with suitable M.S. handles on either side.
• Offered in two grades of accuracies as under:Grade-1:having at least 25 bearing spots in 25x25 mm area, maximum error in specified angle between working surfaces being within +/-5'.
  Grade-2:having at least 20 bearing spots in 25x25 mm area, maximum error in specified angle between working surfaces being within +/-10'.
• Offered in sizes with various working angles between working faces as shown in the table.

Jash Cast Iron Straight Edges are widely used for setting up and leveling machinery and for checking and spotting bearing surfaces during hand-scraping operations. Properly supported, they may be used with various indicating devices to check surface flatness of large machined areas like Surface Table. Machine Tables and Beds, Machine ways etc.

• Offered in two types viz Bow shaped or Camel Back Type and I-Section or Parallel Type, in standard sizes generally as per IS: 5268.
• Bow shaped Straight Edges are provided with pads on their bow for supporting Engineer's level.
• Made from close grained plain cast iron conforming to Grade FG; 220 of IS: 210 1978.
• Casting stress relieved to remove internal stresses.
• Offered in three Grades of accuracies viz Grades 0, 1 and 2, standard sizes, dimensions, flatness and parallelism tolerances are as stated in table.
• Straightness accuracy checked by Electronic level, computer print out of the contour of working surfaces is furnished.
• Offered in hand scraped surface finish for Grades 0 and 1, Smooth machined / ground / scraped surface finish for Grade 2.
• Flatness of side faces: Any 300 mm length flat within 25 microns for Grade 0 and 1 and within 50 microns for Grade 2, subject to the maximum tolerance on flatness over the whole length, as under:-
  For straight edges up to and including 4000 mm length 50 microns for Grades 0 and 1 and 100 microns for Grade 2.
  For straight edges longer than 4000 mm 100 microns for Grades 0 & 1 and 200 microns for Grade 2
• Squareness of working surfaces and side faces when checked with side face laid on Grade 1 surface plate-
  For Grade 0 and 1 : within 8 microns per 25 mm
  For Grade 2 : within 15 microns per 25 mm
• Parallelism of side faces :
  For Grade 0 and 1 : Not exceeding 30 microns per 300 mm and 60 microns over the whole length.
  For Grade 2 : Not exceeding 60 microns per 300 mm and 120 microns over the whole length
• Two numbers Grade 1 parallel straight edges of the same length can be offered as matched pair, at extra cost, ensuring equality of overall depth within the tolerance on parallelism for the respective length of straight edge.
• Actual dimensions of straight edges may be even more than those stated in the table below.
• No two straight edges of the same length will have any of the dimensions exactly the same, except in case of two numbers parallel straight edge made specially as a matched pair wherein only the overall depth shall be equal within the tolerance on parallelism for the respective length.

JASH Cast Iron Box Angle Plate serves as a versatile tool for layout machine set ups, tooling and inspection. They can also be used as right angles and squares. A job can be fixed with one of its faces and rotated in five positions without the need for repositioning or disturbing accuracy. They can easily be made into special fixtures by providing tenons, pins or stops. Matched pairs can be used as Parallels and Height Blocks.

• Made generally as per IS: 6232.
• Made from close grained plain cast iron conforming to grade FG 220 of IS 210 (equivalent to GG20 / FT20 / 30-A). Higher grades also offered on request.
• Castings stress relieved to relieve internal stresses.
• Offered in two grades of accuracies Grades -1 & 2 in standard sizes as stated in table.
• Hand - scraped surface finish for Grade 1 accuracies.
• Hand scraped / ground finish for Grade 2 accuracies.
• Machined T-Slots on one face and cored as cast slots on four opposite faces provided to facilitate clamping.
• Can be offered in matched pairs, upon request at extra cost.
• Precision Box Angle Plates to IS: 6985 having tolerances approximately half of those mentioned in table made upon request.
• Other sizes as per customer's specific requirement also offered, upon special request.

JASH Cast Iron Box Parallels are extensively used in machine shop for set up in machine operations. These are also used as height blocks for scribing and inspection and for building up the height of components on machine tables.

• Made generally as per IS: 4241.
• Made from close grained plain cast iron conforming to grade FG: 220 as per IS:210 (equivalent to GG20/FT20/30-A). Higher grades also offered on request.
• Castings stress relieved to relieve internal stresses.
• Offered with hand scraped surface finish. Can also be offered in ground finish, upon special request.
• Tapped holes / T-slots / cored elongated slots provided on request, at extra cost.
• Offered as matched pair.

JASH Universal Right Angles or Knee Angles are widely used for making fixtures as well as for checking squareness and parallelism of surfaces. All machined faces are square and parallel and job can be rotated in different planes that are square with respect to each other.

• Made from close grained Plain Cast Iron Castings conforming to Grade FG-220 of IS-210.
• Working surfaces and sides offered with hand-scrapped finish.
• Squareness of faces within 10 microns per 100 mm.
• Parallesim of faces within 10 microns per 100 mm.
• Finer accuracies can also be achieved on request at extra cost.
• Teak-ply storing case provided on request at extra cost.

JASH Cast Iron Right Angles are widely used a vertical reference for inspection of components and for checking squareness. Cast iron right angles has bottom and the adjacent square face finished flat and square to each other as well as the two adjacent narrow sides finished flat and square to other two faces and are parallel to each other.

• Made from close grained Plain Cast Iron Castings conforming to Grade FG-220 of IS-210,
• Working surfaces and sides offered with hand-scrapped finish.
• Two working surfaces provided ( H x B & L x B ).
• Standard size & their accuracies as under.
• Finer accuracies can also be achieved on request at extra cost.
• Teak-ply storing case provided on request at extra cost.

JASH C.I. Lapping Platesare extensively used for accurate hand lapping of ferrous & non-ferrous parts to obtain a perfect oil tight surface.

• Made from close grained plain cast iron conforming to grade FG: 220 of IS: 210 (equivalent to GG20 / FT20 / 30-A). Higher grades also offered on request.
• Castings stress relieved to relieve internal stresses.
• Hand scraped surface finish.
• Offered in square, rectangular and round sizes.
• Constructional features of square and rectangular sizes similar to those of Cast Iron Surface Plates as per IS: 2285.
• Plates up to 630 x 630 mm provided with handles for lifting. Larger plates provided with cored holes in peripheral for lifting by mechanical means.
• Provided with 3 x 3 mm groves at a nominal pitch distance of 25 to 30 mm on top surface.
• Supplied with rexine cover for top surface protection.

Tooling Blocks (pallet mounting) play an important role in ensuring the maintenance of precision during work. The blocks simultaneously provide more than one face for holding components accurately in a vertical plane. This makes it easy to machine on horizontal machining centers and prevents any movement while working. The specific construction of our tooling blocks reduces downtime by eliminating multiple setups. Every time a table is indexed, a new face with new components is obtained. This is what reduces the downtime.

Pallet mounting tooling blocks allow multiple fixture plates to be loaded and unloaded simultaneously and this helps in reducing the overall setup time. The tooling blocks also find their application in vertical clamping of components on Horizontal Boring Machines, Milling Machines, Horizontal Jig Mills etc. For custom requirements, contact JASH, the leading manufacturer and supplier of tooling blocks.

• Made from stress relieved plain close grained gray cast iron conforming to Grade FG: 220 of IS: 210 (equivalent to GG25/F T25/ 35-A). Higher grades are made available on request.
• Surface finish comes in Machined / Hand scraped variants.
• Suitable for mounting multiple fixture plates (Pallet) with different features.
• Bottom base can be made available with counter bored holes for fixing / clamping on machine pallet. Please request a custom quote for the same.
• Working faces flat, Square and parallel within 25 microns (0.001") over 300mm (12").
• Milled Tooling Blocks also offered with extra metal for final finish machining on user's own machining centers. This is made available upon request.
• Special features, if required, can also be offered.

Tooling Blocks simultaneously provide multiple faces to hold components accurately in vertical plane for machining on Horizontal machining centres. Upon indexing of table a new face with new components is obtained for machining resulting into significant reduction of downtime by elimination of multiple set ups. Pallet mounting tooling blocks also enable simultaneous loading and unloading of multiple fixture plates thereby reducing total set up time. Tooling Blocks can also be used for vertical clamping of components on Horizontal Boring Machines, Milling Machines, Horizontal Jig Mills etc.

• Made from stress relievd plain close grained gray cast iron conforming to Grade FG: 220 of IS: 210 (equivalent to GG25/F T25/ 35-A). Higher grades also offered on request.
• Machined / Hand scraped surface finish.
• M16 tapped holes / helicoil inserts, vertical tenon slots/edge locator tapped holes / coolent drain holes, can be offered upon request.
• Bottom base can be provided with counter bored holes for fixing / clamping on machine pallet, upon request.
• Working faces flat, Square and parallel within 25 microns (0.001") over 300mm (12").
• Milled Tooling Blocks also offered with suitable allowance (extra metal) for final finish machining on user's own machining centres, on request.
• Special features, if required, can also be offered.

These are used mainly for gauging, inspection, squareness testing & for checking three axis geometric accuracies of machine tools.

• Made from close grained Cast Iron Casting conforming to Grade FG-220 of IS-210 (equivalent to GG20 / FT20 / 30-A). Higher grades also offered on request.
• Casting duly stress relieved.
• All the faces offered duly hand-scrapped finish. Also offered in lapped finish upon request.
• Finer accuracies can also be achieved on request, at extra cost.
• Teak-ply storing case provided on request, at extra cost.

JASH Master Cylinders / Cylindrical Squares provide most reliable reference standards for checking of squareness of vertical axis with reference to horizontal axis.

• Made from good quality alloy steel, heat treated for maximum stability and wear resistance.
• Periphery precision ground and lapped to a fine surface finish.
• Made generally as per IS-6952.
• Ends are recessed and have lapped finish.
• Provided with teak ply storing case on request at extra cost.
• Stands if required supplied at extra cost.

These are used for truing, spotting and reconditioning of dovetailed guide ways of machine tools, slides and similar work pieces.

• Made from close grained plain cast iron conforming to Grade FG; 220 of IS: 210 (equivalent to GG20 / FT20 /30-A). Higher grades also offered on request.
• Casting stress relieved to remove internal stresses.
• Provided with suitable M.S. handles on either side.
• Offered in two grades of accuracies as under:Grade-1:having at least 25 bearing spots in 25x25 mm area, maximum error in specified angle between working surfaces being within +/-5'.
  Grade-2:having at least 20 bearing spots in 25x25 mm area, maximum error in specified angle between working surfaces being within +/-10'.
• Offered in sizes with various working angles between working faces as shown in the table.

Used in 36kV to 145kV rating SF6 Gas Insulated Electrical Switchgear.Three different types of Enclosures can be offered viz, Bus, Switch and for Cable Termination with or without RFT Body as per the customer requirements and other features can also be incorporated.

• Supplied in Stainless Steel material SS 304 or SS 316.
• Stainless Steel Enclosures are tested for Welding Quality by Dye-Penetrant Test, Ultra-sonic Test and by Radiography.
• Only Qualified Welders and Qualified process are used. Stainless Steel Enclosures are precision machined on CNC Machines to obtain Geometrical and positioning accuracy.
• Stainless Steel Enclosures are electro-polished to give a surface finish of Ra 0.8.
• SS Enclosures are powder coated as per Customer's choice of paint.
• Tested for sniffer Helium Leak Test up to 2 x 10-6 std cc/sec.

Used in Electrical Rotating machines like AC/DC Motors, Generators, Traction Motors.

Can be supplied in CACA, CACW, TEFC, TETV & TENV frame types and of Frame sizes, 315, 355, 400, 450, 500, 560.

• Manufactured in the state of the art facility with different steel grades as per the customer requirements
• With dis-similar welding facility and heavy machining meeting size and geometrical tolerance requirements.
• Having Heavy Fabrication, Boring, milling, Blasting, Painting and testing facilities under one roof, gives better controlled, quality product with reliability, in time.

Accuracy :

• Cored and ribbed construction, made from close grained plain cast ironGrade FG:200-IS:210 (equivalent to GG20 / FT 20 / 30-A), having hardness within 160-220 HB. Also offered in higher grades of casting upon request.
• Castings stress relieved as a precaution against distortion.
• Offered in varied heights viz. 150, 175, 250, 300, 350, 400, 450, 500mm depending upon the loading condition to be specified by the buyer
• Smooth machined or rough ground or rough scraped or fine hand scraped surface finish as may be necessary to obtain desired flatness accuracy or as specified by the buyer.
• Normally provided with longitudinally machined clamping type fixing T-slots sizes 14, 18, 22, 28, 36 or 42 mm conforming to IS:2013 / DIN 650 having H12 tolerance. Guiding T-slots with H7/H8 tolerance can be provided
• Flatness accuracies offered in Grade I, II or III as per DIN-876
• Flatness accuracies as per IS-10602 can also be offered.
• Flatness accuracies measured using precision electronic level for high precision applications, can be offered at extra cost.
• Supplied with suitable arrangement for leveling and anchoring on the floor.
• Special work mounting and locating features like mounting and positioning holes, scribe lines, grooves, one T-slot and one side face provided accurately straight to serve to serve as references etc., can also be offered upon request.
• Pockets on top of plates, to house bolts for interconnection of similar plates meant for obtaining larger overall made up size.
• Stand mounting type with leveling screws either accessible from top or from bottom, as required.

JASH Floor Clamping Rails or Fitter Bars or Floor Skids as commonly known, have a very wide range of uses. These rails placed in line and rows to the required pitch, for example 500mm (or as per customers requirement) apart, provide economical solutions for large planes with T-slotted Floor area for assembly, fabrication and testing of large components / machines etc. These are permanently grouted in concrete floors.

• Made from close grained plain cast iron to minimum Grade - FG: 200 - IS: 210 having hardness within 160-220 HB. Also offered in higher grades of casting upon request.
• Castings stress relieved as a precaution against distortion.
• Top working surface planed / milled machine finish.
• Normally provided with single machined clamping type fixing T-slots sizes 28, 36 or 42 mm conforming to IS:2013 having H12 tolerance.
• Flatness accuracies for individual rail are offered within 0.05 mm per meter length.
• Supplied with suitable arrangement for leveling and anchoring on the floor.
• Standard sizes / dimensions as per table hereunder.
• Rails with multiple T-slots & customer specific requirements, can also be offered upon request from buyer.