60 • Chapter 6 Programming Motion DMC-1000
GR 5,,-.5,10 Set gear ratios
PR ,10000 Specify Y position
SP ,100000 Specify Y speed
BGY Begin motion
Example - Electronic Gearing
Objective: Run two geared motors at speeds of 1.132 and -0.045 times the speed of an external master.
The master is driven at speeds between 0 and 1800 RPM (2000 counts/rev encoder).
Solution: Use a DMC-1030 controller, where the Z-axis is the master and X and Y are the geared
axes.
MO Z Turn Z off, for external master
GA Z Specify master axis
GR 1.132,-.045 Specify gear ratios
Now suppose the gear ratio of the X-axis is to change on-the-fly to 2. This can be achieved by
commanding:
GR 2 Specify gear ratio for X axis to be 2
In applications where both the master and the follower are controlled by the DMC-1000 controller, it
may be desired to synchronize the follower with the commanded position of the master, rather than the
actual position. This eliminates the coupling between the axes which may lead to oscillations.
For example, assume that a gantry is driven by two axes, X,Y, on both sides. The X-axis is the master
and the Y-axis is the follower. To synchronize Y with the commanded position of X, use the
instructions:
GA XC Specify master as commanded position of X
GR,1 Set gear ratio for Y as 1:1
PR 3000 Command X motion
BG X Start motion on X axis
You may also perform profiled position corrections in the electronic gearing mode. Suppose, for
example, that you need to advance the slave 10 counts. Simply command
IP ,10 Specify an incremental position movement of 10 on Y axis.
Under these conditions, this IP command is equivalent to:
PR,10 Specify position relative movement of 10 on Y axis
BGY Begin motion on Y axis
Often the correction is quite large. Such requirements are common when synchronizing cutting knives
or conveyor belts.
Example - Synchronize two conveyor belts with trapezoidal
velocity correction.
GAX Define master axis as X
GR,2 Set gear ratio 2:1 for Y
PR,300 Specify correction distance
SP,5000 Specify correction speed
AC,100000 Specify correction acceleration
DC,100000 Specify correction deceleration
BGY Start correction
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
Need help?
General
