______HSD Technological equipment for Automation _____________________________________
5801H0017 Rev. 02 _________________________________________________________ 57/98
11.5 SPEED LIMITATIONS
ALWAYS RESPECT THE MAXIMUM TOOL SPEED (RPM)
SPECIFIED BY THE TOOL MANUFACTURER.
Never exceed the maximum speed specified by the tool manufacturer.
It is the operator's responsibility to decide whether to perform certain machining operations at
slower speeds (NEVER HIGHER) than those specified by the tool manufacturer or those listed as
guidelines in the following pages.
11.5.1 Content of graphs
The graphs on the following pages show sample maximum no-load electro-spindle rotation speeds.
These have been calculated for different total weights of the TOOL + TOOL HOLDER assembly
(including ring nut and elastic collet), and for different distances between the nose of the electro-
spindle and the centre of gravity “G” of the tool + tool holder assembly.
The tool + tool holder assembly has been considered as a single mass applied at the centre of
gravity “G” (without considering size or shape).
The degree of balancing is that recommended in the previous sections.
The graphs on the following pages are purely indicative. HSD S.p.a. does not know and the
graphs therefore cannot take into account details of individual machining operations, tool
specifications, or characteristics of the material being machined. It is therefore the operator's
responsibility to determine maximum safe speed on a case by case basis.
11.5.2 Reading the graphs
1. Find the graph for your own electro-spindle.
2. Select the curve for distance “X” between the nose of the spindle and the centre of gravity “G”
of the tool + tool holder assembly. If the value of “X” measured on your electro-spindle does not
appear in the graph, use the curve for the next higher value of “X” (see example).
3. Read off the maximum speed value for the weight of the tool + tool holder assembly.
EXAMPLE
You have an ES919 L HSK F63 SHORT NOSE electro-spindle, and want to use a tool + tool
holder assembly weighing a total of 3.5 kg (including ring nut and elastic collet). The distance
between the spindle nose and the centre of gravity “G” of the tool + tool holder assembly “X” is 120
mm.
1. The graphic for this particular electro-spindle is that in section 11.5.6 .
2. Since there is no curve for “X”=120 mm, use the curve for the next higher value, i.e. the yellow
curve for “X”=130 mm.
3. Against the weight 3.5 kg read off the maximum no-load speed, which is 10000 rpm.
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