Drilling Speed And Quantity Of Body Jumping - Hitachi DH 40MR Technical And Service Manual

6-5. Drilling Speed and Quantity of Body Jumping

The graph shown in Fig. 4 illustrates the relationship between
drilling speed and quantity of body jumping. The quantity of
body jumping is less than the similar products and the working
tool quickly penetrates into the workpiece.
Tool shake is low.
Fast
Body jumping
is low !!
Quantity of body jumping is
low and the tool smoothly
penetrates into the
workpiece with good feeling.
Fig. 4
--- 11 ---
Pushing force: 100 N
Working tool quickly
penetrates into the
workpiece !!
Self drilling !!