Precision Granite FAQs. 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. Da Engine 5.4.3 more. FastCAM have over 40 products, grouped as follows. All are designed to be used by tradespeople, independent of any other software, unless specified. Machine Tool Manufacturing Buyers Guide website Also do research and development projects. Sharpen chipper blades with precision machine for industrial chippers. AIRCRAFT SPRUCE CATALOG PDF DOWNLOAD To view the files youll need the Adobe Acrobat reader. If you dont have the Adobe reader, you can download it. Fastcut Cnc Software' title='Fastcut Cnc Software' />In general, granites color is directly related to the presence or absence of minerals, which may have no bearing on the qualities that make good surface plate material. There are pink, gray, and black granites that are excellent for surface plates, as well as pink, gray, and black granites that are totally unsuitable for precision applications. The critical characteristics of granite, as they pertain to its use as a surface plate material, have nothing to do with color, and are as follows a Stiffness deflection under load indicated by Modulus of Elasticityb Hardness c Density d Wear resistancee Stabilityf Porosity To talk more about the granite that is right for your project, please call 8. Is there an industry standard for surface plate accuracyA Most manufacturers use ASME B8. Federal Specification GGG P 4. Granite Surface Plates as a basis for their specifications. Features. Open Architecture FastCut CNC systems let you use any CAD or nesting software you may already be familiar with to create your drawings and cut files. Find great deals on eBay for CNC Plasma in Welding Plasma Cutters. Shop with confidence. Call Sales Direct 0 0, Machinery Sales 0, General Enquiry 0, Let Us Give You a Call. 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, granites. You can access the ASME spec at asme. GGG P 4. 63c here. How is surface plate flatness defined and specified A Flatness can be considered as all points on the surface being contained within two parallel planes, the base plane and the roof plane. The measurement of distance between the planes is the overall flatness of the surface. HTB126osKVXXXXb3aXXXq6xXFXXXz/205140269/HTB126osKVXXXXb3aXXXq6xXFXXXz.jpg' alt='Fastcut Cnc Software' title='Fastcut Cnc Software' />This flatness measurement commonly carries a tolerance and may include a grade designation. The flatness tolerances for three standard grades are defined in the federal specification as determined by the following formula Laboratory Grade AA 4. Inspection Grade A Laboratory Grade AA x 2 Tool Room Grade B Laboratory Grade AA x 4. For standard sized surface plates, we guarantee flatness tolerances that exceed the requirements of this specification. In addition to flatness, ASME B8. Federal Specification GGG P 4. Tru Stone granite surface plates and granite inspection plates meet or exceed all of the requirements set forth in this specification. 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. To further address surface plate flatness specifications, please call 8. How can I reduce wear and extend the life of my surface plateA First, it is important to keep the plate clean. Airborne abrasive dust is usually the greatest source of wear and tear on a plate, as it tends to embed in work pieces and the contact surfaces of gages. Second, cover your plate to protect it from dust and damage. Wear life can be extended by covering the plate when not in use, by rotating the plate periodically so that a single area does not receive excessive use, and by replacing steel contact pads on gauging with carbide pads. Also, avoid setting food or soft drinks on the plate. Note that many soft drinks contain either carbonic or phosphoric acid, which can dissolve the softer minerals and leave small pits in the surface. To learn more, please contact us at 8. How often should I clean my surface plate A This depends on how the plate is being used. If possible, we recommend cleaning the plate at the beginning of the day or work shift and again at the end. If the plate becomes soiled, particularly with oily or sticky fluids, it should probably be cleaned immediately. Clean the plate regularly with Starrett liquid or Starrett Waterless surface plate cleaner. The choice of cleaning solutions is important. If a volatile solvent is used acetone, lacquer thinner, alcohol, etc. In this case, it is necessary to allow the plate to normalize before using it or measurement errors will occur. The amount of time required for the plate to normalize will vary with the size of the plate, and the amount of chilling. An hour should be sufficient for smaller plates. Two hours may be needed for larger plates. If a water based cleaner is used, there will also be some evaporative chilling. The plate will also retain the water, and this could cause rusting of metal parts in contact with the surface. Some cleaners will also leave a sticky residue after they dry, which will attract airborne dust, and actually increase wear, rather than decreasing it. We would gladly talk you through this process. Feel free to contact us at 8. 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. Monthly inspection for repeat measurement errors using a Repeat o Meter, or similar device will show any developing wear spots and only takes a few minutes to perform. After the results of the first recalibration are determined, the calibration interval may be extended or shortened as allowed or required by your internal quality system. Questions Please contact us at 8. Why do the calibrations performed on my surface plate seem to vary A There are several possible causes for variations between calibrations The surface was washed with a hot or cold solution prior to calibration, and was not allowed sufficient time to normalize. The plate is improperly supported See Q. Temperature change. Drafts. Direct sunlight or other radiant heat on the surface of the plate. Be sure that overhead lighting is not heating the surface. Variations in the vertical temperature gradient between winter and summer If at all possible, know the vertical gradient temperature at the time the calibration is performed. Plate not allowed sufficient time to normalize after shipment. Improper use of inspection equipment or use of non calibrated equipment. Surface change resulting from wear. If this answer did not sufficiently answer your question, please contact us at 8. What does Repeat Measurement mean Isnt it the same as flatness A A repeat measurement is a measurement of local flatness areas. The Repeat Measurement specification states that a measurement taken anywhere on the surface of a plate will repeat within the stated tolerance. Controlling local area flatness tighter than overall flatness guarantees a gradual change in surface flatness profile thereby minimizing local errors. Most manufacturers, including imported brands, adhere to the Federal Specification of overall flatness tolerances but many overlook the repeat measurements. Many of the low value or budget plates available in the market today will not guarantee repeat measurements. A manufacturer who does not guarantee repeat measurements is NOT producing plates that meet the requirements of ASME B8. Federal Specification GGG P 4. Ask us about our guarantee of Repeat Measurement. Call 8. 00 9. 59 0. Which is more important flatness or repeat measurements A Both are critical to ensure a precision surface for accurate measurements. Flatness specification alone is not sufficient to guarantee measurement accuracy. Take as an example, a 3. X 4. 8 Inspection Grade A surface plate, which meets ONLY the flatness specification of. If the piece being checked bridges several peaks, and the gage being used is in a low spot, the measurement error could be the full tolerance in one area, 0. Actually, it can be much higher if the gage is resting on the slope of an incline. Errors of. 0. 00.