What is a repeat-o-meter?
Repeat-O-Meter Reading Gage. High-precision, fast checking of surface plate repeatability with readings taken with a dial indicator. Detects local error, not overall flatness.
What material is surface plate made of?
They can be made from granite, metal, cast iron, or glass. Granite is considered to be the best material for a surface plate due to its surface hardness, low thermal expansion, no rust or corrosion, little warping, and long wear life attributes. These attributes result in very accurate, stable and precise measurements.
What are the grades of surface plates?
Manufacturers use three standard grades of flatness defined by the federal specification: Laboratory grade AA: (40 + diagonal [in inches] of surface plate squared/25) x 0.000001 in. Inspection grade A: Laboratory Grade AA x 2. Tool room grade B: Laboratory Grade AA x 4.
How often should a surface plate be calibrated?
6) 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.
How accurate are surface plates?
Apart from the given height map, some meaningful characteristic parameters: sphericity, torsion and waviness are obtained. They have been proven very valuable to record long term effects of surface plates. Reliable measurements with an accuracy of 0.1 μm/m demonstrate the capabilities of the method.
How much does it cost to calibrate a surface plate?
Pricing: Calibration Only
| Surface Plate Calibration Only | Price | Square Feet |
|---|---|---|
| 36″ x 36″ Surface Plate | $50.00 | 9 |
| 36″ x 48″ Surface Plate | $60.00 | 12 |
| 36″ x 60″ Surface Plate | $75.00 | 15 |
| 36″ x 72″ Surface Plate | $90.00 | 18 |
What is the accuracy of surface plate?
How do you test for flatness of a surface plate?
There are a number of ways to measure the flatness of a surface. The most common method within the Flat Lapping sector is by using a Monochromatic Sodium light unit and an Optical Flat. This gives extremely precise measurements, more accurate than most CMM measurements, in an economical way.
How do you calibrate a surface plate?
Calibration is done by checking conformance of the surface plate to the two different tolerance values. If necessary, adjustments to the surface plate flatness – typically onsite re-lapping – can be done by those with the required skills and tools.
What is lapping plate?
JASH Cast Iron Lapping Plate is extensively used for accurate hand lapping of metal parts to obtain a perfect oil tight fit.
What is the accuracy of surface?
Where can I buy a Rahn repeat O Meter?
The RAHN REPEAT-O-METER is on sale at Gaging.com! You will need this instrument if you want to be compliant with Federal Spec. GGG-P-463C to test repeatability (repeat measurement) on your Surface Plates. Use the Repeat-O-Meter to scan the work surface of the surface plate.
What do you use repeat O Meter for?
Use the Repeat-O-Meter to scan the work surface of the surface plate. The indicator readings (delta) shall not exceed the values shown in Federal Specification GGG-P-463c. The Repeat-O-Meter substitutes the traditional height gage and gage block method, but is far more dependable and easier to use.
How is repeated measures ANOVA used in repeated measures analysis?
In the approach here we will use a repeated measures analysis with all the measurements, treating Student as a random variable to take into account native differences among students, and including an autocorrelation structure.
When to use nested effects in repeated measures?
Likewise, a simple mixed effects repeated analysis statement in proc mixed in SAS could be specified with: A similar specification in with the lme function in nlme package in R would be: In repeated measures analysis, it is common to used nested effects. For example, if our subject variable is treatment within block,