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07/2002 Editio n Student G uide HS -50 Advanc ed II 7 X-Axis 6 The struc ture o f the ga ntries ma kes the m very torsiona lly rigi d. Prec ise me chanic al movem ents of the axes are pr oduced by axis r ecircul ating ba…
Student Guide HS-50 Advanced II 07/2002 Edition
7 X-Axis
5
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The placement system is equipped with four gantries. These enable the four collect&place heads
to be positioned in the x and y directions with great accuracy and independently of one another.
(1) Gantry 1 (2) Gantry 2
(3) Gantry 3 (4) Gantry 4
1
4
2
3
07/2002 Edition Student Guide HS-50 Advanced II
7 X-Axis
6
The structure of the gantries makes them very torsionally rigid. Precise mechanical movements
of the axes are produced by axis recirculating ball screw units.
High-precision positioning systems determine the positions of the x and y axes. To do this, the
graduations on metal scales are optoelectronically scanned and the track signals are sent to the
axis control in the control unit.
Direct drive units are used to position the placement heads in the x and y directions. This elimi-
nates friction losses, for example, which are typical when complex gearing is used. In addition,
there is none of the wear that can significantly affect the accuracy of positioning systems over the
course of time.
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A toothed belt is used to convert the rotary movement of the turning motor for the X-axis directly
into a translatory movement of the placement head in the x direction.
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The air filter box for the X-motors, consisting of one filter and two highperformance fans, is
mounted directly above the cooling air inlet of the linear motor.
– Sleeve contamination is reduce by 20%
– Contamination of valve tappets is reduce by 40%
– The frequency of maintenance require is reduce by 30%
Student Guide HS-50 Advanced II 07/2002 Edition
7 X-Axis
7
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The principal element of the gantry is the torsionally rigid precision-cast gantry. Diagram
7.2 - 1
contains a plan view of its major components.
Diagram 7.2 - 2 shows a bottom view of the gantry.
(1) Precision-cast gantry (2) Head mount
(3) Incremental encoder for Y-axis scale (4) Primary part of the y linear motor
(5) Motor bracket (6) Thrust bearing
(7) X-axis motor unit (8) Toothed belt
(9) Deflection unit (10) Y-axis brake, external
(11) Y-axis brake, internal (12) Proximity switches B1 and B2 for the Y-axis