Mechanical Adjustment Of The Rotational Part; Guiding Profile And Counterprofile - Planmeca Proline CC Technical Manual

5

MECHANICAL ADJUSTMENT OF THE ROTATIONAL PART

5.1

Guiding profile and counterprofile

Technical Manual
When designing the unit we aimed at minimizing need for adjustments in connection with assem-
bly and service. The technique used, particularly guidance electronics, has permitted us to elimi-
nate most adjustments, but there are still certain adjustments to be done.
Some of the adjustments related to the mechanics of the unit cannot be done without special
tools (alignment tools). It is important therefore to check that all special tools for assembling the
unit are available, see "REQUIRED TOOLS" on page D-2.
The clearance between the guidance profile and the counterprofile can be checked and adjusted
if necessary when the loading spring of the drive wheel is removed. Also the drive wheel with
transmission can be removed, but this is not necessary. Note that all major parts must be
installed so that the rotational part has about its final weight.
Provided that these requirements are fulfilled the clearance can be observed by moving the rotat-
ing unit sidewards from both ends (see figure below). Note that the rotating unit has to be half
way trough the rotating cycle. When moving the rotating unit parallelly sideways the longitudinal
clearance appears as clearance.
Figure 33
If there is any clearance it is eliminated by unscrewing screws (see figure below) and pushing the
counterprofile towards the cassette mechanism. Do not use any tools to move the counterprofile.
Tighten the screws by pressing the screw head with finger. Check once more that there is no
clearance left but also that the contact between the counterprofile and the guidance profile is not
tight. This can be done by carefully pushing the rotating unit from the cassette end using the
same speed at which it moves when it is driven by the stepper motor and turn it approximately
45Ž to both directions. If there is too much tension, the movement is stiff and continually sticks in
the middle area.
Figure 34
Chapter D - ADJUSTMENT & CALIBRATION
Planmeca Proline CC panoramic x-ray D-21