Variable Cam Speed Compensation for Non-Standard Table Moves In Matrix Drilling
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Acciai, M: AUTHOR [+3]
This disclosure covers the ability to compensate the cam speed of a matrix drill machine so that a non-standard table move can be handled without stopping the cam.
Variable Cam Speed Compensation for Non-Standard Table
Moves In Matrix
disclosure covers the ability to compensate the cam
speed of a matrix drill machine so that a non-standard table move can
be handled without stopping the cam.
When doing matrix drilling using an IBM
Hydrapad or Matrix
Drill Tool, table moves (positioning of the panel in the correct
location under the drills) is done during the dwell period of the
cam. The finite amount of time required for the table to move and
verify position works only if the drill patterns have a standard set
of table locations or always move on grid.
If any of the
drill locations are not standard and the table
does not position itself in time, the cam must stop, an error posted,
and the cam re-homed before drilling can continue. If the table
moves are shorter than standard, cycle time is lost waiting for the
cam to reach a particular location on the dwell so the next operation
To allow more
or less than for the table to reach position
during a non-standard move, several velocity profiles are stored in
the cam servo controller. The servo controller is then programmed to
ramp to the correct speed based on a hex word and execute line
written to the DI port by the host controller. The host controller
monitors the table move data and determines if the move is short,
standard, or in a range of long moves. An interrupt generated by a
cam position, prior to the dwe...