Placement accuracy gauge for electrical components and method of using same
- Overland Park, KS
- Independence, MO
- Grandview, MO
Surface mounted electrical components are typically assembled on printed wiring boards by automatic machines. It is important that the machines accurately move with respect to both X and Y rotational axes in order to insure that components are positioned precisely on connector pads of the printed wiring board being assembled. In accordance with the instant invention, a gauge is used to facilitate convenient accuracy checks. The gauge is a glass substrate on which grids of 0.005 inch lines are scribed to form location and orientation fields where components are to be placed. The grids are referenced from either fiducial marks or the edge of the substrate to establish known positions within the grids. The equipment to be evaluated is programmed to place components in known positions and the components are held in place by tacky adhesive that is sprayed on the substrate prior to placing the components. The accuracy of the component position is then compared to the programmed position by placing the substrate on a light table and observing the component location. If a significant inaccuracy with respect to any of the axes exists, the inaccuracy is apparent because the component is not aligned properly with the grid. If a precise measurement of an axis inaccuracy is desired, a measuring microscope may be utilized.
- Research Organization:
- Kansas City Plant (KCP), Kansas City, MO (United States)
- DOE Contract Number:
- AC04-76DP00613
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4776088
- Application Number:
- 07/119,878
- OSTI ID:
- 866733
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
accuracy
gauge
electrical
components
method
surface
mounted
typically
assembled
printed
wiring
boards
automatic
machines
accurately
move
respect
rotational
axes
insure
positioned
precisely
connector
pads
board
accordance
instant
facilitate
convenient
checks
glass
substrate
grids
005
inch
lines
scribed
form
location
orientation
fields
placed
referenced
fiducial
marks
edge
establish
positions
equipment
evaluated
programmed
held
tacky
adhesive
sprayed
prior
placing
component
position
compared
light
table
observing
significant
inaccuracy
exists
apparent
aligned
properly
grid
precise
measurement
axis
desired
measuring
microscope
utilized
surface mounted
electrical components
glass substrate
substrate prior
positioned precisely
printed wiring
fiducial mark
wiring board
measuring micro
surface mount
electrical component
light table
/29/356/