Emco compact 8, Instruction Book / Parts List

Page: 14 / 57

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Choosing the correct operating speed
Example:
Rough turning of a steel shaft 70kp/mm
2
, shaft diameter 45mm, chosen feed 0,09mm/rev.
With these values one can find from the diagram the speed and the maximum permissible cutting depth to be
used. The cutting. depth is the amount that the cross slide can be fed relative to the suface of shaft.
In the diagram for "Steel up to 70kp/mm
2
tensile strength", going along the line "workpiece diameter 45mm"
to the right until the point where the heavy 45
°
line crosses (Point "A"), the figure
2
50 gives the speed -
2
50revs/min. By taking a vertical line from Point A downwards, the maximum cutting depth of approx. 1,5
mm is obtained:
The dotted lines in the diagram give the equivalent depth of cut when using the 0,18mm/rev. feed. (For the
above example the cutting depth would be 0,97mm).
The heading "drill diameter in mm" is for boring.
As an example:
A bore of 10mm (drill fitted in tailstock, the workpiece in the chuck) requires a spindle speed of 850revs/
min.
! NOTE ! The values of depth of cut shown in the diagram are the results of long trials and experience.
Slipping Clutch:
To avoid the overloading of the drive, a safety-slipping clutch is fitted.
Overloading the drive (rattling noise) means the depth of cut is too deep and should be reduced (check with
the values given in the table).
200
110
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120
100
90
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70
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tensile strength
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