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Posted by on March 13, 2008, 5:03 pm
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Hi Friends,
I'm trying to help my Italian friend sort out an electrical problem
with his Bridgeport mill.
Please excuse my inexpertise in electrical terminology. I am just a
friend trying to help him
out as he doesn't speak english and there is no Bridgeport support
here in Italy. This is
what I know about his situation:
1. He has a "burned" resistor (I think that's the right term) on his
"FEED CONTROL" circuit
board. It blew and there is a heat marking on the board where it was
fried.
2. The resistor is marked R6 on the board, which corresponds to the
wiring diagram.
3. The photos illustrated show the basic type of mill (Bridgeport 2HP
model), the electrical
panel, the position of the electrical board for the feed control, the
position of the board,
and the general electrical layout.
4. The mill was manufactured in 1979 and the serial number is 7978.
The resistor was burned and there is no visible markings or colors
with which to reference.
He is asking me if anyone knows what the resistance capacity is (in
ohms??) so he can
source a new one.
Can anybody help two lost souls? Sorry again that I'm not a machinist
or electrician.
Thanks so much for reading and we'd really appreciate your help.
Ciao,
darren
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Posted by Lew Hartswick on March 13, 2008, 6:35 pm
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dmcrisp@gmail.com wrote:
> Hi Friends,
> I'm trying to help my Italian friend sort out an electrical problem
> with his Bridgeport mill.
> Please excuse my inexpertise in electrical terminology. I am just a
> friend trying to help him
> out as he doesn't speak english and there is no Bridgeport support
> here in Italy. This is
> what I know about his situation:
> 1. He has a "burned" resistor (I think that's the right term) on his
> "FEED CONTROL" circuit
> board. It blew and there is a heat marking on the board where it was
> fried.
> 2. The resistor is marked R6 on the board, which corresponds to the
> wiring diagram.
> 3. The photos illustrated show the basic type of mill (Bridgeport 2HP
> model), the electrical
> panel, the position of the electrical board for the feed control, the
> position of the board,
> and the general electrical layout.
> 4. The mill was manufactured in 1979 and the serial number is 7978.
> The resistor was burned and there is no visible markings or colors
> with which to reference.
> He is asking me if anyone knows what the resistance capacity is (in
> ohms??) so he can
> source a new one.
> Can anybody help two lost souls? Sorry again that I'm not a machinist
> or electrician.
> Thanks so much for reading and we'd really appreciate your help.
> Ciao,
> darren
There must be some other problem that caused the resistor to burn up.
So just finding the value and replacing it won't be a solution.
I don't have a schematic here to check but may have at school,
I won't be able to check till Monday if this thread hasen't solved
your problem by then I'll giv it a look.
...lew...
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Posted by T.Alan Kraus on March 14, 2008, 2:13 pm
Please log in for more thread options dmcrisp@gmail.com wrote:
> Hi Friends,
>
> I'm trying to help my Italian friend sort out an electrical problem
> with his Bridgeport mill.
>
> Please excuse my inexpertise in electrical terminology. I am just a
> friend trying to help him
>
> out as he doesn't speak english and there is no Bridgeport support
> here in Italy. This is
>
> what I know about his situation:
>
> 1. He has a "burned" resistor (I think that's the right term) on his
> "FEED CONTROL" circuit
>
> board. It blew and there is a heat marking on the board where it was
> fried.
>
> 2. The resistor is marked R6 on the board, which corresponds to the
> wiring diagram.
>
> 3. The photos illustrated show the basic type of mill (Bridgeport 2HP
> model), the electrical
>
> panel, the position of the electrical board for the feed control, the
> position of the board,
>
> and the general electrical layout.
>
> 4. The mill was manufactured in 1979 and the serial number is 7978.
>
> The resistor was burned and there is no visible markings or colors
> with which to reference.
>
> He is asking me if anyone knows what the resistance capacity is (in
> ohms??) so he can
>
> source a new one.
>
> Can anybody help two lost souls? Sorry again that I'm not a machinist
> or electrician.
>
> Thanks so much for reading and we'd really appreciate your help.
>
> Ciao,
> darren
R6 shows as 47 Megaohms on my schematic.
cheers
T.Alan
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Posted by Michael A. Terrell on March 14, 2008, 3:12 pm
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"T.Alan Kraus" wrote:
>
> R6 shows as 47 Megaohms on my schematic.
22 Megohm is the highest standard value. Anything higher is either
special order, or made from a group of lower values.
--
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Posted by Jon Elson on March 15, 2008, 2:55 am
Please log in for more thread options Michael A. Terrell wrote:
> "T.Alan Kraus" wrote:
>
>>R6 shows as 47 Megaohms on my schematic.
>
>
>
> 22 Megohm is the highest standard value. Anything higher is either
> special order, or made from a group of lower values.
>
>
You could plug a 47 Meg Ohm resistor into the wall socket all
day and it would never burn up, even on the 230 V European
mains. So, the 47 MOhm value must be from a different circuit
assembly than the original poster has. (Might also be 4.7
MOhm.) I'm guessing this is a manual mill with a power feed
with a variable-speed control on a DC motor. I think Bridgeport
did make one of these under their own label, but a real pupular
one is the "Servo" brand, too. So, maybe we need to be sure we
know the brand of the power feed unit.
Jon
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> I'm trying to help my Italian friend sort out an electrical problem
> with his Bridgeport mill.
> Please excuse my inexpertise in electrical terminology. I am just a
> friend trying to help him
> out as he doesn't speak english and there is no Bridgeport support
> here in Italy. This is
> what I know about his situation:
> 1. He has a "burned" resistor (I think that's the right term) on his
> "FEED CONTROL" circuit
> board. It blew and there is a heat marking on the board where it was
> fried.
> 2. The resistor is marked R6 on the board, which corresponds to the
> wiring diagram.
> 3. The photos illustrated show the basic type of mill (Bridgeport 2HP
> model), the electrical
> panel, the position of the electrical board for the feed control, the
> position of the board,
> and the general electrical layout.
> 4. The mill was manufactured in 1979 and the serial number is 7978.
> The resistor was burned and there is no visible markings or colors
> with which to reference.
> He is asking me if anyone knows what the resistance capacity is (in
> ohms??) so he can
> source a new one.
> Can anybody help two lost souls? Sorry again that I'm not a machinist
> or electrician.
> Thanks so much for reading and we'd really appreciate your help.
> Ciao,
> darren