Granite Surface Plate 12″ x 18″ x 3″ A Grade
June 28, 2019 - Comment
Usually only found in machine shops, the super flat face of the granite surface plate is ideal for leveling small plane beds, flattening waterstones and general sharpening duties. Simply soak a piece of wet/dry sandpaper in water and lay it down on the stone; the capillary action of the water adheres the paper to the stone, eliminating the need for spray adhesives or PSA sandpaper. When done, wipe clean with a paper towel. This A grade plate measures 12″ x 18″ x 3″, weighs 80 lbs. and comes with a surface map. Plate does not have ledges.
Product Features
- Stable, ultra flat surface
- Flat to .00005
- Moisture and corrosion free
- Easy to clean
Comments
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Love this plate! I purchased this to outfit a guitar tech shoproom; It’s a fantastic item for working on small parts like guitar saddles and nuts, truing up leveling blocks, etc. I also love it for sharpening knives, chisels, plane blades, etc. The plate is as true as you could want it for purposes such as these. While you could probably get it set up in your shop yourself if you’re a strong dude or dudette (It’s about the size/weight of a large bag of concrete mix), I’d recommend having a buddy give you a hand…
Great plate for the money Great plate for the money. There is a glitch in the advertising. The .000050″ flatness stated on the web site is for grade AA. The plate is advertised as grade A which is .000100″. This particular plate came in at 2.5 microns which is right at spec for Grade A. Just note that the plate is flat within .000100″‘ not .000050″.
Weighs about 65 pounds (29 kg), so be careful. The granite is gray, although the photo looks black. Now there are granites, and there are granites. The red granites (pink, actually) tend to have higher quartz content and therefore harder surfaces. At the other extreme, the black granites often have no quartz content (and so aren’t strictly granites at all) but are considerably stiffer, so can maintain the same accuracy with a thinner plate. The gray granites are somewhere in the middle. Granite is hygroscopic and can absorb enough moisture…