How many shoe uppers can be processed before the lining trimmer knife has to be reground?
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PFAFF Industrial supplies knives with different shapes for the different types of
lining. They are available in different base materials and dimensions.
Depending on lining
material and seam length the knives have to be reground after anything
from 150 to 400 pairs. Optimum sharpening is guaranteed by the PFAFF
Industrial knife-grinding machine, type 68. A knife can be reground 15 to 20 times
before it is fully worn out.