Granite reference plate

It is flat within µm (µm micron = mm) measured form a corner across the surface. Reference and Feeler Gages. First off, the top surface of the granite plate is the business surface, the sides and bottom of the plate are not certified. The bottom of the stone is generally parallel to the top, and pretty flat.

Granite surface plate calibration should be performed routinely to maintain the proper flatness and ensure measurement accuracy over time. The intervals between each surface plate calibration depends on the condition of the environment where the surface plate is located. This bugger is heavy, find a good place and leave it there it is not exactly portable. Dimensional Gauge is most respected in the Aerospace, Energy and Automotive sectors and is the most technically competent provider of granite plate repair and recertification that is available. Extend Plate Life Following a few guidelines will reduce wear on a granite surface plate and ultimately, extend its life.

First, it is important to keep the plate clean. How often should a surface plate be calibrated? A) This depends on the plate usage and environment.

We recommend that a new plate or precision granite accessory receive a full recalibration within one year of purchase. If the plate will see heavy use, it may be advisable to shorten this interval to six months. With reference to Federal Spec GGG-P-463c: Per the equation and explanation in section on page 1 the minimum thickness for a particular grade depends on the modulus of elasticity (E) of the granite in use (and on several other factors). From Table XI page 1 the minimum thickness for x Grade A is for E = 9. These precision granite surface plates are precision lapped to high standards of flatness to achieve accuracy and are used as bases for mounting sophisticated mechanical, electronic and optical gauging systems. Gage Block Specialty Products.

Optical Polygons and Flats. Our high-quality black granite surface plates provide the strongest, most durable and stable surfaces available. Surface Plate Accessories. At present, there is no defining specification for granite angle plates , parallels, or master squares. Our standard tolerances (listed in our catalog) for these items are the tightest in the precision granite industry.

Thick glass can substitute for granite. Laboratory tests have shown that fine-grained black granites are stronger, denser, and less absorbent than other granites. What color of granite is best?

A) It is important to note that color alone is not an indication of the physical qualities of the stone. In general, the color of granite is determined by the presence or absence of minerals which may have no bearing on the qualities that make good surface plate material. Our range of surface plates are specifically designed to provide an accurate reference plane for work inspection and also for work layout.

These granite surface plates , cast iron surface plates are strictly in compliance with international quality standards and can also be customized as per the specifications laid down by our clients. STANDRIDGE granite surface plates provide an accurate reference plane for work inspection and for work layout. Their high degree of flatness, overall quality and workmanship also make them ideal bases for mounting sophisticated mechanical, electronic and optical gauging systems. Providing calibration and resurfacing service of granite surface plates.

Because a surface plate is a standard or “0” reference point, there are many uses for surface plates. Whether alongside manufacturing or in final inspection, granite surface plates are vital for quality control. I guess that in the age of dirt cheap granite reference plates they have effectively become disposable. Many laboratories and shops rely specifically on granite surface plates for precise measurement and inspection. Every measurement depends on an accurate surface reference from which dimensions are taken, and granite plates offer the perfect base for gaging surfaces and making accurate height measurements.

The Rahn Company, of Dayton Ohio, has specialized in making metrological granite reference plates and fixture plates for many years. This is a precision surface plate with a 1. A friend has a long granite reference bar that I can borrow to check the two 18x(Grade A - Bush Precision and Tru-Stone) and 12xStarret pink. The Repeat-O-Meter is the instrument that is used to check the repeatability, or small wear spots that occur from normal everyday use.

The products are always made into ribbed plate or box-type, our company use the scraping process to improve the precision of the products. Leading manufacturer of granite surface plates , machine bases and accesories. STANDRIDGE Granite has been in the surface plate industry for over five decades. Because of our experience, STANDRIDGE played a significant part in the subcommittee to rewrite granite surface plate Federal Specification GGG-P-463c. Read reviews (5) Made entirely of granite.

Any serious woodworker needs a granite s. Using this in my small machine shop as a flat reference for. Inspecting a granite plate with an autocollimator. There’s more to your surface plate than meets the eye. While granite is very hard and not greatly affected by temperature fluctuations – making it an ideal material for a reference surface – with continued use, a granite surface plate will wear over time. As a family owned business, four generations of inherited talent promises to benefit our customers for years to come.

Court for access to the motor vehicle registration records in order to cross reference the names of low-number plate holders with. Granite comes in numerous colors, yet some shades are in higher supply than others, contributing to both the cost and perceived quality of the stone. Blue, purple and red are the least common and.