Page 84 - THREADING CATALOG

USER GUIDE
THREAD TURNING Constant Depth Per Pass

This method defines constant depth per pass (except for
the last pass), regardless of the number of passes. The last
pass for the finish operation is recommended to be 0.05
- 0.1 mm (0.0019 - 0.0039 inches). This method is less
productive than the previous method, as it causes a larger
number of passes and is usually used in cases of problems
with chip control. The chip thickness is constant on each
pass, but the chip area on subsequent passes is larger,
respectively, and the load on the tool and material removal
rate increase on each pass. For example, when cutting a
60-degree threading with a constant depth of 0.25 mm
(0.0098 inches) per pass, the second pass removes three
times more metal than the first. And with each passing
pass, the value of metal removed increases exponentially. Number of Passes
The optimal number of passes should be checked in each
specific case in order to achieve maximum effectiveness
but, in any case, any pass should not be less than 0.05
mm (0.0019 inches). ISCAR’s consultants will be glad
to identify the best solution according to the customer’s
threading requirements and production process.

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