The manufacture of the needle valve body 1 (see figure) requires many processing steps and high dimensional accuracy and must be achieved by grinding. To this end, we made grinding tools. When in use, the taper shank 8 is inserted into the head frame of the grinder to be fixed. Insert the right end of the grinding rod 5 into the hole of the spring collet 7 and tighten the lock nut 6 to fix the grinding rod horizontally. Place the C-shaped shell 4 on the small end cylinder of the grinding rod 5, and apply a small amount on the outer diameter of the C-shaped shell 4.
The reaming shell must be cleaned with clean water after use and record the use of drilling tools.
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