The basic function of large diameter gages (also known as rail gages, or shallow diameter gages) is to check large outside or inside diameters at a controlled depth. A rest surface is required to locate the gage. A part print that specifies the diameter to be checked and whatever rest surfaces are available is best. Details on machine fixtures that the gage may need to clear is also useful information to have when we are quoting modified large diameter gages. Dorsey Metrology manufactures a wide variety of large diameter gages with special bridge, donut and ‘C’ frames to clear center obstructions. We also offer large diameter set-masters with special anvils to check tapered or angled diameters. Large diameter gages with hump frames are available to provide increased rigidity to check diameters with greater than normal depth specifications.
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