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| equipment:metalshop:granitesurfaceplate [2023/02/08 13:09] – drew | equipment:metalshop:granitesurfaceplate [2024/11/19 21:42] (current) – external edit 127.0.0.1 | ||
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| - | =====Granite Surface Plate===== | + | =====Granite Surface Plate - 450mm x 300mm ===== |
| - | <callout title=" | + | |
| {{: | {{: | ||
| - | 450mm x 300mm (18" | + | <callout title="Crush " |
| - | Grade AA is the highest grade of surface plate, it is flat to within 1 micron, (Or Half-anatstesticle | + | A granite |
| - | It is HEAVY, 30kg, and not attached to the small crate it's standing on, hence the warning above. | + | This Granite Surface plate is Grade AA, this is the highest grade of surface plate, |
| - | It is to be used as a surface for accurate measurements and for testing flatness with engineers micrometer or bearing blue ( not the blue used for marking out surfaces ). | + | This is over spec for our needs! Grade B would normally |
| - | Scratching the surface will ruin it so it is not to be used for lapping, cutting, bashing, or as a general purpose bench surface. | + | It is HEAVY, 30kg, and not attached to the small crate it's standing on, hence the warning above, please be careful when lifting or moving the plate. Ask someone to help, this plate is a 2 person lift. |
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| + | Scratching the surface will ruin it so it is not to be used for lapping, cutting, bashing, or as a general purpose bench surface. Look after our tools, and they will look after us. | ||
| ====Instructions==== | ====Instructions==== | ||
| - | **Please keep the plate clean and dust free.** | + | **Please keep the plate clean and dust free.** |
| This plate is accurate to 0.001mm or 1 micron. Dust in the air is up to about 500microns (0.500mm), Humans cannot see dust smaller than about 50 microns (0.050mm). If you touch the plate top, you will leave grease thicker than 0.001mm. | This plate is accurate to 0.001mm or 1 micron. Dust in the air is up to about 500microns (0.500mm), Humans cannot see dust smaller than about 50 microns (0.050mm). If you touch the plate top, you will leave grease thicker than 0.001mm. | ||
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| * Make sure any metal surfaces are smooth before placing them on the surface plate, check by feeling the surface with your finger or the back of your hand, smooth with fine emery if necessary. | * Make sure any metal surfaces are smooth before placing them on the surface plate, check by feeling the surface with your finger or the back of your hand, smooth with fine emery if necessary. | ||
| * Place items on the plate **carefully** to avoid chipping or scratching the plate. | * Place items on the plate **carefully** to avoid chipping or scratching the plate. | ||
| + | * It can be used with engineers micrometer or bearing blue ( not the blue used for marking out surfaces ). | ||
| * Always keep the plate covered when not in use. | * Always keep the plate covered when not in use. | ||
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| ===Accessories=== | ===Accessories=== | ||
| - | There is Imperial Dial Test indicator and DTI stand with the Metal lathe. Otherwise, the Hackspace does not have much by the way of metrology kit you will need to bring your own. | + | There is Imperial Dial Test indicator and DTI stand with the Metal lathe, and vernier calipers in the metal lathe accessories drawers. Otherwise, the Hackspace does not have much by the way of metrology kit you will need to bring your own to use with the plate. |
| ===Hand scraping info=== | ===Hand scraping info=== | ||