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Standard Metrology Products
CALIBRATION SERVICES CLEANERS
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METROLOGY ACCESSORIES SURFACE PLATE CALIBRATION PRODUCTS

Calibration labs and manufacturing facilities around the world are using Tru-Stone precision granite standards. Our procedure is to produce surface plates that exceed federal specification GGG-P-463c; at minimum, they will meet the required specifications. Inspections are performed by staff members who have completed a stringent training program and participate in annual proficiency testing – just one of our many efforts to produce high quality products. Our metrology accessories exceed standards set by the industry.

All standard metrology products are supplied with a NIST traceable calibration certificate. If requested, an A2LA accredited certificate will be issued for any calibrations that are within our ISO/IEC 17025 scope. Along with these precision granite products, we supply stands to properly support our surface plates, covers to protect the plates when they are not in use and cleaners to help lengthen the life of the accuracy of your product. We strive to provide you with the highest quality products combined with excellent customer service and fast turnaround on products in stock at the time of order.

Whether your precision granite product weighs a few pounds or a few tons, we will crate it with care. Our crating personnel have developed expertise after many years of experience and testing.

CALIBRATION AND CERTIFICATION SERVICES
Tru-Stone offers calibration and certification services for both surface plates and accessories. These services are not limited to only granite nor do we require the product be manufactured by Tru-Stone. We will resurface and/or certify both granite and ceramic products regardless of where or by whom the item was manufactured. You may have old granite products that are in very poor condition and think there is no chance of restoration. We can grind and lap your old products in our factory, making them appear like new. As with new products, our calibrations are accredited by A2LA (for perpendicularity, parallelism, flatness and repeat reading).

SURFACE PLATES
surface plates, granite surface plates, repeat-o-meter, black granite, charcoal granite, ggg-p-463c, granite plates The majority of our surface plates are produced with charcoal black granite. Upon request, we can also manufacture black diabase, pink or gray plates as well. Plates are produced to meet or exceed federal specification GGG-P-463c. Final inspection of our surface plates is done with an autocollimator or electronic levels and Repeat-O-Meter. Black and pink plates are engineered to support a loading weight of 100 pounds per square foot, loaded in the center of the plate; which is twice that required by federal specification. This means that the designated load may be placed in the center of the plate without deflecting the overall accuracy more than 50%. Special loading and size considerations can be quoted upon request.

In surface plates, flatness is very important; however, repeat reading is equally important. The flatness and repeat readings of Tru-Stone plates are unilateral, not bilateral. The term unilateral accuracy means that all points on the work surface are contained between two parallel planes, separated by a distance greater than the distance specified for each size and grade. The term bilateral accuracy means twice (+ or – the accuracy stated) as much flatness deviation may exist. The values specified on Tru-Stone calibration certificates are the TIR (total indicator reading).

In addition to our standard surface plate sizes, we will quote any other size requirements you may have. We can also make modifications to your plate, which includes t-slots, inserts, holes, etc.

SURFACE PLATE SUPPORT
To insure accurate readings, you need to support your granite surface plate properly on three or four points as specified in GGG-P-463c. Tru-Stone offers several options for supporting your plate. The standard work height for all stands is 36” unless otherwise specified.

Floor locks are available for all castered stands.

Tubular Steel Surface Plate Stands:
Stands, plate stands, surface plate stands, tubular steel surface plate stands, stationary plate stands, rolling plate stands, mobile surface plate stands, surface plate support, surface plate tablesOur stands are constructed from welded square steel tubing to provide exceptional strength and durability. Steel crossbeams are located at the proper support points to ensure maximum surface plate accuracy. Stands are supplied with a scratch and abrasion resistant industrial painted finish. Our standard color is gray; however, other colors are available upon request and at an additional charge. Stands require no assembly. Stationary stands come with leveling adjustors with the typical adjustment being 2”. Rolling stands are fabricated with two stationary and two swivel casters.

Cabinet Support Stands:
Cabinet stands are constructed with square steel tubing and heavy gauge steel. Leveling screws are provided on the bottom of each leg, adjustable to obtain the standard work height of 36”. Roomy cabinet space is provided with a shelf and locking doors.

Drawer Stands:
Drawer stands, stanley vidmar drawer stands Stanley-Vidmar drawer stands are available upon request. Please note that these stands are not made specifically for our surface plates and are, therefore, not an exact match in size.

Block and Wedge Systems:
Block and wedge system By using a block and wedge system, you remove the need for a large steel stand to support your granite base. This system is comprised of three granite blocks, cut and honed to provide the desired work height. An adjustable wedge is placed between the top of the block and the bottom of the surface plate. This system provides maximum support with minimal cost. Standard blocks are 12”x12”, with a height based on the thickness of your surface plate.

Granite metrology accessories, master square, master squaresMETROLOGY ACCESSORIES
Master Square: Master squares are ideal for inspecting the X, Y and Z axes of machine tools. This product is very stable and rigid, providing the ultimate in squareness references. Our master squares have 5 finished faces (1 large face and 4 edges) finished flat, square and parallel to either laboratory grade AA (.000025” per 6”) or inspection grade A (.000050” per 6”). All six faces can be finished upon request.

Standard metrology accessories, master angle, master angles, 2-face master angle, two-face master angle, two face master angle, 3-face master angle, three-face master angle, three face master angleMaster Angle: These triangular shaped master angles are ideal for checking X, Y and Z axes of machine bases or parts. They are very rigid and stable and come with either 2 or 3 finished faces. The 2-face master angle has 2 perpendicular edges finished flat and square. The 3-face has a large triangular face finished flat and square to those two edges. Our master angles come in laboratory grade AA (.000025” per 6”) or inspection grade A (.000050” per 6”).

Standard metrology accessories, angle plate, 2-face angle plate, two-face angle plate, two face angle plate, 3-face angle plate, three-face angle plate, three face angle plateAngle Plate: Angle plates provide a convenient and practical means of clamping and holding work in a vertical position. Their excellent finish and flatness make them very compatible for use with granite surface plate accuracies. The angle plates are available with either 2 or 4 finished faces. The 2-face angle plate has the bottom and the adjacent square face finished flat and square to one another. The 4-face is similar to the 2-face, but has the two adjacent sides finished flat and square to the other two faces, as well as being parallel to each other. The laboratory grade AA has a tolerance of .000025” per 6” and the inspection grade A has a tolerance of .000050” per 6”.

Standard metrology products, inserted angle plateInserted Angle Plate: Inserted angle plates are available upon request. This product is the same as our standard angle plate with the addition of metal discs inserted into one side. The inserted angle plates also have a main gauging face for magnetic chucking purposes and threaded inserts for clamping purposes.

Standard metrology products,straight edge, impala black graniteStraight Edge: Our straight edges are produced from impala black granite, as are all of our accessories. Straight edges have a single long, narrow face finished flat. Laboratory grade AA accuracy is .000025” per 12” and inspection grade A accuracy is .000050” per 12”. Lifting holes are provided on sizes 48” or larger.

Standard metrology accessories, parallels, 2-face parallel, two-face parallel, two face parallel, 4-face parallel, four-face parallel, four face parallelParallels: These precision tools can be used to elevate work above the surface of a plate to enable quick and easy inspection of piece parts with shoulders or steps, along with many other uses. Our parallels are provided in matched pairs with either 2 or 4 finished faces. 2-Face parallels have the 2 narrow faces finished flat and parallel. 4-Face parallels have the wide faces finished flat and parallel as well as the two narrow faces. Parallels are available in laboratory grade AA (.000025” per 12”) or inspection grade A (.000050” per 12”).

Standard metrology accessories, v-block, v blockV-Blocks: V-Blocks are ideal for supporting or holding cylindrical pieces during manufacturing or inspection. They are provided in matched pairs and have 5 finished faces. V-blocks have a nominal 90-degree “V”, centered with and parallel to the bottom and two sides and square to the ends. V-Blocks come in either laboratory grade AA (+/- .000050” per 6”) or inspection grade A (+/- .000100” per 6”).

Standard metrology products, bench comparators, accurate inspection toolBench Comparators: The bench comparator is a highly accurate inspection tool used for checking roundness, diameters, lengths, steps, flatness, angles and parallelism. Bench comparators come with a stainless steel post and indicator holder (lug mount is standard, stem mount is available upon request).

CLEANERS
Keeping your precision granite products clean and in the best condition can lengthen your calibration intervals and help ensure that your readings are accurate. Tru-Stone provides two types of cleaner: liquid and waterless.

cleaners, liquid cleaner, waterless cleaner, pink liquid cleaner, waterless cleaner, granite cleaner, surface plate cleanerOur pink liquid cleaner is furnished in plastic bottles. Cases containing (12) quart containers or (4) gallon containers are available.

Our waterless cleaner is a product that is extremely popular. This product was once a valuable item in the offerings of Rahn Granite Surface Plate Company. Since the consolidation of our two companies, Tru-Stone now offers this cleaner. The waterless cleaner is packaged in 1-pound containers, with there being (12) per case.

Cleaners are sold in case quantity only.

SURFACE PLATE COVERS
surface plate covers, surface plate protection, covers We highly recommend the usage of surface plate covers to protect your precision granite investment. Prevent abrasive build up on your plates with our covers made from heavy gauge black vinyl with a soft interior lining. Our covers provide a tough, durable, protective outside with a soft cushion inside.

CASES
cases, travel cases, storage cases, granite accessory travel case, granite accessory storage case Tru-Stone offers two types of cases: travel and storage.

Our travel cases provide maximum protection for shipping or transporting accessories. They are constructed with a polyurethane exterior, reinforced steel edges and aircraft-style locks along with a padded interior for the ultimate protection.

Our storage cases have a vinyl exterior cover with a padded interior to keep your granite accessories safe and clean while they are not in use.

SURFACE PLATE CALIBRATION PRODUCTS

RAHN PLANEKATOR:
surface plate calibration products, planekator, rahn planekator Federal Spec GGG-P-463c dictates that the proper methods for determining the overall flatness of a granite surface plate. In section 4.5.9, it states, “A…system of diagonals, perimeter and center lines may be calibrated on plates, and especially on small ones, by using a precision calibrated straight edge, adjustable supports and a suitably mounted indicator…”. This is a basic description of the Planekator.

The Planekator kits consist of a granite straight edge, a set of supports (one fixed height and one adjustable), a calibrated .000020” dial indicator with indicator carriage and a storage case. The straight edge is supplied with a correction tape.

When selecting your Planekator, consider the size of the plate(s) you will be inspecting. The straight edge should be at least equal to the full width of the plate and at least equal to 50% of the length of the plate. For example, a 36” Planekator straight edge can be used to calibrate any surface up to 36”x72”.

RAHN REPEAT-O-METER:
surface plate calibration products, repeat-o-meter, repeat o meter, rahn repeat-o-meter, surface plate measurement accuracy The Repeat-O-Meter is used to scan visually the work surface of the plate. The range of the indicator readings shall not exceed the values shown in Table II of section 3.3.3 in Federal Specification GGG-P-463c. The Repeat-O-Meter performs the same function as a height gage and gage block, but is more dependable and easier to use.

In a short amount of time, you can check the repeat measurement accuracy of a surface plate by moving the Repeat-O-Meter over the work surface, noting the full indicator range (F.I.R.). In just a few more minutes, by zeroing the R-O-M at the center along a diagonal or centerline and then recording readings at 5” intervals, you can chart the readings from the plate. The difference between the greatest plus and minus readings is the maximum measurement error possible on the plate.

Granite surface plates, Surface plates, Federal spec, Federal spec ggg-p-463c, Stands, Surface plate stands, Surface plate tables, Surface plate support,Block and wedge, Drawer stands, Cabinet stands, Granite cleaner, Surface plate cleaner, Waterless cleaner, Granite repair kits, Surface plate covers, Granite metrology accessories, flatness, flatness standards, metrology products, metrology accessory, metrology accessories, Motion system base, Granite machine base, Vacuum table, Wafer chuck, Vaccum, Granite specifications, Granite specs, Stainless steel inserts, Threaded inserts, Insert torque, Academy black, Imperial black, Zimbabwe black, Sierra gray, Tru-Clean, Tru clean, Lab grade, Laboratory grade, Inspection grade, Tool room grade, Toolroom grade, Grade AA, Grade A, Grade B, Metrology, Inspection plates
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Angle plate, Master angle, Granite reference masters, Master square, Straight edge, Parallels, v-blocks, vee blocks, universal right angle, granite cube, bench comparators, granite stands, step blocks, custom granite, lvdt, planekator, rahn, repeat-o-meter, granite calibration, ceramic calibration, granite certification, ISO 9001, ISO 17025, A2LA accredited, Granite resurfacing, Granite reconditioning, Granite lapping, Long form cert, 100 pound loading, unilateral tolerance, bilateral tolerance, repeat reading, repeat measurement, precision granite, ceramic, porous ceramic, dense ceramic, carbon fiber, machine bases, NIST traceable, Charcoal black, Pink granite, Black diabase, Impala, Vibration damping, Vacuum chuck, Granite assembly, Tru-vac , Air lift part transfer, Vacuum positioning, Mechanical clamping, Vacuum zone