Browse Prior Art Database

PARTS DISTANCE CALCULATOR INSTRUCTIONS

IP.com Disclosure Number: IPCOM000008745D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-09
Document File: 6 page(s) / 281K

Publishing Venue

Motorola

Related People

Charles Actor: AUTHOR [+3]

Abstract

When a part is placed by a Universal Instruments HSP 4795 chipshooter, the placement speed of the machine can be affected by the distance the XY table must move between part placements. As shown by the chart below, the XY table can move 18 millimeters in both the X and Y direction in I seconds, which is the fastest possible placement speed of the machine's turret. When the XY table travel distance increases beyond 18 millimeters per part placement, the time required for the XY table movement increases above I seconds.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 22% of the total text.

Page 1 of 6

~1'

t M 0

MOTOROLA Technical Developents

PARTS DISTANCE CALCULATOR INSTRUCTIONS

by Charles Actor, Henry Wandt and Thomas Nolan

BACKGROUND table can move 18 millimeters in both the X and Y direction in I seconds, which is the fastest possible

  When a part is placed by a Universal placement speed of the machine's turret. When Instruments HSP 4795 chipshooter, the placement the XY table travel distance increases beyond speed of the machine can be affected by the 18 millimeters per part placement, the time required distance the XY table must move between part for the XY table movement increases above placements. As shown by the chart below, the XY I seconds.

0.4 T
0.35 ~1 E 0.3 1 ic 0.25 1 2 0.2 J $o.f5 i

0.1 +
0.05 + Oi

&&&a Time- 6.

0 18 55 95 135

Moving Distance (mm)

XY Table Moving Distance vs. Cycle time

  The moving distance referred to in the graph 13.8 mm. The table on the next page lists the X and above is actual movement of the XY table in the Y table movement needed to compensate for the X and/or Y direction. Due to the nozzle arrange- head rotation required to move from a part with one ment on each of the HSP heads, the change in placement angle to a second part with another the placement angle from one part placement to placement angle. The table applies to consecutive the next part placement results in an X and/or Y parts using the same nozzle number.
movement which relates to the head diameter of

c Moromla. 1°C~ IV98 June 1998

[This page contains 15 pictures or other non-text objects]

Page 2 of 6

0 M

MOTOROLA Ethnical Developments

SE

From - To (deg) Movement in X dir (mm) Movement in Y dir (mm) 0 - 90 +6.9 -6.9
0- 180 +13.8 0
0 - 270 +6.9 t6.9
90 - 0 -6.9 +6.9
90- 180 +6.9 t6.9
90 - 270 0 +13.8
180-O -13.8 0
180.90 -6.9 -6.9
180-270 -6.9 +6.9
270 - 0 -6.9 -6.9
270 90 0 -13.8
270 - 180 t6.9 -6.9

  As can be seen by the table above, the X and Y movement associated with different placement angles is fairly significant compared to the 18 mm of "free" XY table movement that can occur in
.l seconds.

FEATURES OF THE PROGRAM

  The machine parameters listed above present both challenges and opportunities for the optimiza- tion of parts placement sequences. The challenge results from the fact that to achieve a repeatable
.I second placement speed, the actual distance between successive parts combined with X and Y movement associated with the placement angle differences between parts must result in no more than I8 mm of XY table movement in the X and/or Y direction. The opportunity results from the fact that most chipshooter parts on a typical paging product decoder or receiver have no polarity requirements and can therefore be rotated 180 degrees from the GCAM specified rotation with no adverse consequences. Therefore, the cycle time of a chipshooter program can be improved by changing the placement sequence of the parts and the placement angle of some parts so that as many placements as possible result in an XY table move- ment of 18 m...