Replacement Probe Calibration Sphere

This device is equal or superior to any product on the market, but it is sold factory direct for a fraction of competitive products. These probe calibration spheres are a direct replacement for worn or damaged devices. The one inch 1.00” ( 25.4 mm ) spherical diameter version of the precision probe calibration sphere is our Part number PM-PB-LB100. The three quarters of an inch ( ¾”, 0.750”, 19.06 mm ) diameter, version of the precision probe calibration sphere is our Part number PM-PB-LB75. The 19 millimeter ( 0.74803 inch ) spherical diameter, version of the precision probe calibration sphere, is our part number PM-PB-LB19M. The 25 millimeter ( 0.98425 inch ) spherical diameter, version of the precision probe calibration sphere, is our part number PM-PB-LB25M.

For calibrating normal commercial quality measuring machines, the very precise grade 5 spheres are used. These spheres are absolutely round within five millionths of an inch ( 0.000127 mm ) maximum. The surface texture on these spheres is less than 0.7 micro inches ( 0.0000177 mm ) RA maximum. For calibrating the ultimate quality measuring machines, we offer our grade 2.5 spheres. These spheres are absolutely round within 2.5 millionths of an inch, (0.0000635mm), maximum. We consider this to be the highest quality roundness that can be measured commercially. The surface texture on these spheres is less than 0.5 micro inches ( 0.0000127mm ) RA, maximum. The ultra precise one inch 1.00” ( 25.4 mm ) spherical diameter version of the probe calibration sphere is our Part number PM-UB-LB-100. The Ultra Precise three quarters of an inch ( 19.05 mm ) spherical diameter ultra precision version of the probe calibration sphere is our Part number PM-UB-LB-75.

The ultra precise 19mm (0.74803 inch) spherical diameter, version of the Probe Calibration sphere is our Part Number PM-UB-LB19M. the ultra precise 25 mm ( 0.98425 inch ) spherical diameter, version of the probe calibration sphere is our Part number PM-UB-LB-25M The body of this device is made of alloy steel that is 30%, more rigid than the ordinary stainless steel versions sold by other companies. The body of this probe sphere is highly polished and then heavy nickel plating is applied, to eliminate any corrosion problems. The rugged body diameter of these devices is one and one quarter inch ( 1 ¼”, 1.25”, 31.75 mm). The base of these probe calibration spheres is precision flat lapped within micro inches to provide the ultimate locating surface. One of the very important features of these devices is that the all of the precision stainless steel spheres used match the exact stiffness of the steel and iron parts that you are measuring. This is unlike the common ceramic balls used on many of these devices. Ceramic balls are typically one third stiffer than iron or steel parts that you measure, so your machine will end up measuring the test parts slightly smaller than they actually are.

What this means is that the Hertzine elastic deformations of the master ceramic spheres that is caused by the contact force of the measuring probe will be far less than on the iron and steel parts being measured. The master sphere used on our probe calibration devices are constructed from micro grained Martensetic stainless steel that is hardened to 58 HRC minimum and three cycle cold stabilized for long term dimensional stability. This means that the diameter of theses balls will remain exactly the same size indefinitely. The spheres are not just glued on top of the probe calibration post. The ball and the post are drilled with a one eights of an inch diameter hole ( 1/8”, 0.125”, 3.175 mm ), and the sphere is glued over this pin. We use a super strength, ceramic filled, epoxy glue, to fix the sphere rigidly to the base.