In terms of price, Sharp estimates that LED lights without remote control are priced at $40, while those with remote control are as high as $82.

Diamond turning and diamond boring
Both diamond turning and diamond boring are performed with polycrystalline diamond tools.
honing
Honing is to use the oil stone (also called honing bar) inlaid on the honing head to finish the hole.
grinding
Grinding is the use of coated or pressed abrasive particles embedded in the grinding tool, through the grinding tool and workpiece in a certain pressure of the relative movement of the surface for finishing processing.
superfinishing
Ultra-finishing is the finishing of the finished surface by using fine-grained whetstone mounted on the vibrating head.
Abrasive belt grinding
Belt grinding is the grinding of workpiece surface with high-speed annular belt.
Mirror grinding
Mirror surface grinding is a grinding method to achieve the optimum surface roughness. After grinding the workpiece, the surface roughness is not more than 0.01 micron, the light is like a mirror, can be clear imaging
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