7 Operation and regulation
128
HSD S.p.A. © - h0106k01a.fm120718
7.6 Tool
At the maximum rated speed of the electrospindle, the tools must have a dynamic balance quality
grade G = 2.5 or better (standard ISO1940).
When selecting the tool, the following recommendations must be taken into
consideration.
Always use tools with optimum sharpness qualities and correctly tightened in the
relative tool holder.
Never use deformed or damaged tools or those with missing parts or not perfectly
balanced.
Always make sure that all the surfaces are unmarked and perfectly clean before
inserting the tool in the relative collet.
The essential requirements for using high-speed tools are:
- compact, short and light
- precise with any inserts correctly fitted with a high degree of safety
- balanced and symmetrically coupled with the tool holder
- with cutting edges near to the axis of rotation.
7.6.1
Speed limits
Respect the maximum revolutions per minute (rpm) indicated by the tool
manufacturer.
The maximum speed indicated by the tool manufacturer must never be exceeded.
Depending on the type and quality of the machining operation to be performed, and the material
used, it is the users responsibility to operate at lower speeds (NEVER HIGHER) than those
specified by the tool manufacturer.
Maximum speed and shape of the tool
The graphs on the following pages provide an example of maximum no-load rotation speed of the
electrospindle according to the weight of the TOOL+TOOL HOLDER assembly (inclusive of ring
nut and elastic collet, where present) and the distance between the nose of the electrospindle and
the centre of gravity "G" of the tool+tool holder assembly.
The tool+tool holder assembly considered mounted in the spindle shaft for calculating the curves
is drawn alongside each graph.
The mass of the tool+tool holder assembly has been applied at the centre of gravity "G",
highlighted in the drawing. Several possible positions of the centre of gravity "G" have been
considered, with a curve drawn on the graph for each position.
The balance quality grade is that recommended in the preceding paragraphs.
If the position of the centre of gravity "G" is unknown, it can be calculated following the
simplified procedure described in paragraph
“Calculating the centre of gravity for the
tool+tool-holder assembly”
.
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