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What is this small unconnected solder blob on this PCB?
Clash Royale CLAN TAG#URR8PPP
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There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. There's nothing on the other side of the board, and there is no hole.
What's the purpose of this blob? My guess is some kind of manufacturing artifact, but I'm not sure exactly.
pcb reverse-engineering manufacturing
asked 4 hours ago
user60561
1826
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up vote
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favorite
There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. There's nothing on the other side of the board, and there is no hole.
What's the purpose of this blob? My guess is some kind of manufacturing artifact, but I'm not sure exactly.
pcb reverse-engineering manufacturing
asked 4 hours ago
user60561
1826
Possibly a marker put in as a drill guide before drilling and slot cutting begins. Often many boards are on a sheet with a stack of 5 or more sheets. There needs to be an absolute ref marker for drilling to be precise. That's my guess.
– Sparky256
4 hours ago
@Sparky256 I don't believe this is the case--it's just a blob of solder on the bottom of the board, it doesn't pass all the way through.
– user60561
3 hours ago
Then read Dave Tweeds more accurate answer. It is a ref maker for the ABS position of parts, one of several that can be on a board. This board has one as it is for through-hole parts, so great accuracy is not needed.
– Sparky256
3 hours ago
@Sparky256 and I did accept that answer :). I appreciate how helpful you and everyone else are here, even though it's clear that I know nothing about the subject.
– user60561
3 hours ago
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. There's nothing on the other side of the board, and there is no hole.
What's the purpose of this blob? My guess is some kind of manufacturing artifact, but I'm not sure exactly.
pcb reverse-engineering manufacturing
asked 4 hours ago
user60561
1826
There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. There's nothing on the other side of the board, and there is no hole.
What's the purpose of this blob? My guess is some kind of manufacturing artifact, but I'm not sure exactly.
pcb reverse-engineering manufacturing
pcb reverse-engineering manufacturing
asked 4 hours ago
user60561
1826
asked 4 hours ago
user60561
1826
edited 3 hours ago
asked 4 hours ago
user60561
1826
asked 4 hours ago
user60561
1826
asked 4 hours ago
user60561
1826
1826
Possibly a marker put in as a drill guide before drilling and slot cutting begins. Often many boards are on a sheet with a stack of 5 or more sheets. There needs to be an absolute ref marker for drilling to be precise. That's my guess.
– Sparky256
4 hours ago
@Sparky256 I don't believe this is the case--it's just a blob of solder on the bottom of the board, it doesn't pass all the way through.
– user60561
3 hours ago
Then read Dave Tweeds more accurate answer. It is a ref maker for the ABS position of parts, one of several that can be on a board. This board has one as it is for through-hole parts, so great accuracy is not needed.
– Sparky256
3 hours ago
@Sparky256 and I did accept that answer :). I appreciate how helpful you and everyone else are here, even though it's clear that I know nothing about the subject.
– user60561
3 hours ago
add a comment |Â
Possibly a marker put in as a drill guide before drilling and slot cutting begins. Often many boards are on a sheet with a stack of 5 or more sheets. There needs to be an absolute ref marker for drilling to be precise. That's my guess.
– Sparky256
4 hours ago
@Sparky256 I don't believe this is the case--it's just a blob of solder on the bottom of the board, it doesn't pass all the way through.
– user60561
3 hours ago
Then read Dave Tweeds more accurate answer. It is a ref maker for the ABS position of parts, one of several that can be on a board. This board has one as it is for through-hole parts, so great accuracy is not needed.
– Sparky256
3 hours ago
@Sparky256 and I did accept that answer :). I appreciate how helpful you and everyone else are here, even though it's clear that I know nothing about the subject.
– user60561
3 hours ago
Possibly a marker put in as a drill guide before drilling and slot cutting begins. Often many boards are on a sheet with a stack of 5 or more sheets. There needs to be an absolute ref marker for drilling to be precise. That's my guess.
– Sparky256
4 hours ago
Possibly a marker put in as a drill guide before drilling and slot cutting begins. Often many boards are on a sheet with a stack of 5 or more sheets. There needs to be an absolute ref marker for drilling to be precise. That's my guess.
– Sparky256
4 hours ago
@Sparky256 I don't believe this is the case--it's just a blob of solder on the bottom of the board, it doesn't pass all the way through.
– user60561
3 hours ago
@Sparky256 I don't believe this is the case--it's just a blob of solder on the bottom of the board, it doesn't pass all the way through.
– user60561
3 hours ago
Then read Dave Tweeds more accurate answer. It is a ref maker for the ABS position of parts, one of several that can be on a board. This board has one as it is for through-hole parts, so great accuracy is not needed.
– Sparky256
3 hours ago
Then read Dave Tweeds more accurate answer. It is a ref maker for the ABS position of parts, one of several that can be on a board. This board has one as it is for through-hole parts, so great accuracy is not needed.
– Sparky256
3 hours ago
@Sparky256 and I did accept that answer :). I appreciate how helpful you and everyone else are here, even though it's clear that I know nothing about the subject.
– user60561
3 hours ago
@Sparky256 and I did accept that answer :). I appreciate how helpful you and everyone else are here, even though it's clear that I know nothing about the subject.
– user60561
3 hours ago
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
9
down vote
accepted
It's most likely a type of fiducial marker, used by a pick-and-place machine to correctly place the SMD parts on the copper side of the board.
answered 4 hours ago
Dave Tweed♦
113k9136245
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
9
down vote
accepted
It's most likely a type of fiducial marker, used by a pick-and-place machine to correctly place the SMD parts on the copper side of the board.
answered 4 hours ago
Dave Tweed♦
113k9136245
add a comment |Â
up vote
9
down vote
accepted
It's most likely a type of fiducial marker, used by a pick-and-place machine to correctly place the SMD parts on the copper side of the board.
answered 4 hours ago
Dave Tweed♦
113k9136245
add a comment |Â
up vote
9
down vote
accepted
up vote
9
down vote
accepted
It's most likely a type of fiducial marker, used by a pick-and-place machine to correctly place the SMD parts on the copper side of the board.
answered 4 hours ago
Dave Tweed♦
113k9136245
It's most likely a type of fiducial marker, used by a pick-and-place machine to correctly place the SMD parts on the copper side of the board.
answered 4 hours ago
Dave Tweed♦
113k9136245
answered 4 hours ago
Dave Tweed♦
113k9136245
answered 4 hours ago
Dave Tweed♦
113k9136245
answered 4 hours ago
Dave Tweed♦
113k9136245
113k9136245
add a comment |Â
add a comment |Â
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Possibly a marker put in as a drill guide before drilling and slot cutting begins. Often many boards are on a sheet with a stack of 5 or more sheets. There needs to be an absolute ref marker for drilling to be precise. That's my guess.
– Sparky256
4 hours ago
@Sparky256 I don't believe this is the case--it's just a blob of solder on the bottom of the board, it doesn't pass all the way through.
– user60561
3 hours ago
Then read Dave Tweeds more accurate answer. It is a ref maker for the ABS position of parts, one of several that can be on a board. This board has one as it is for through-hole parts, so great accuracy is not needed.
– Sparky256
3 hours ago
@Sparky256 and I did accept that answer :). I appreciate how helpful you and everyone else are here, even though it's clear that I know nothing about the subject.
– user60561
3 hours ago