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

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...

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

"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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On Fri, 14 Mar 2008 10:13:07 -0800, "T.Alan Kraus"
wrote:

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


milliohms maybe?
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

What ever the value - make a set up to be one if need be.

If you want a large value - Rtotol = R1+R2+R3..... when in series.
-/\/\--/\/\-/\/\-....

If the value is small - you can parallel them together for a smaller one.

so all ends are together on one side and the other side all ends together.
Make a pigtail if needed - but they become series resistors then - the leads.

If you want to make a 47 millohm - sounds like a sense resistor.

If this is a tube circuit - it would be k or meg for most -

It would be best to tell us the circuit that that part is in. And where.

Transistor / triac / tube - and where the part is .

Low values can be made from large fuses that are trimmed down to increase value.

Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Spehro Pefhany wrote:
On Fri, 14 Mar 2008 10:13:07 -0800, "T.Alan Kraus"
wrote:

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


milliohms maybe?
Best regards,
Spehro Pefhany


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Jon Elson wrote:

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.)

Or even .47 Megohm, if the person doing the drawing didn't know the
difference.


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


A 47 meg custom resistor would cost 10 or more times the cost of two
22 meg and a 3 meg resistor 47 and 66 Meg were used in early color TVs
in the focus circuit. They cost about $5 wholesale, and half watt 5%
resistors were a few cents each. The only reason the custom parts were
used was the high voltage would break down the housing and arc over or
set it on fire.

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On Mar 15, 8:48 pm, "Michael A. Terrell"
wrote:
Jon Elson wrote:

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.)

Or even .47 Megohm, if the person doing the drawing didn't know the
difference.

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

A 47 meg custom resistor would cost 10 or more times the cost of two
22 meg and a 3 meg resistor 47 and 66 Meg were used in early color TVs
in the focus circuit. They cost about $5 wholesale, and half watt 5%
resistors were a few cents each. The only reason the custom parts were
used was the high voltage would break down the housing and arc over or
set it on fire.

--
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Hi Fellas,

Looks like an interesting conversation. I wish I knew what you were
talking about so I could help out. Tomorrow I will ask the owner of
the mill what the brand name of the power feel unit is so I can offer
up more info. Is there any other pertinent information that I can
forward to help with the discussion?

I sincerely appreciate all the dialog and interest in resolving this
problem.

Thanks,

Darren

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.




My bad, it is 4.7 MOhms . Bad eyes, did not see the period between the
numbers. R6 is between a transistor Q1 colector and a 741 opamp with a
22K before it and a 100K after it.

On Sun, 16 Mar 2008 10:25:40 -0800, "T.Alan Kraus"
wrote:

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.




My bad, it is 4.7 MOhms . Bad eyes, did not see the period between the
numbers. R6 is between a transistor Q1 colector and a 741 opamp with a
22K before it and a 100K after it.

Q1 likely shorted?

Gunner



"Pax Americana is a philosophy. Hardly an empire.
Making sure other people play nice and dont kill each other (and us)
off in job lots is hardly empire building, particularly when you give
them self determination under "play nice" rules.

Think of it as having your older brother knock the **** out of you
for torturing the cat." Gunner

On Sun, 16 Mar 2008 10:25:40 -0800, "T.Alan Kraus"
wrote:

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.




My bad, it is 4.7 MOhms . Bad eyes, did not see the period between the
numbers. R6 is between a transistor Q1 colector and a 741 opamp with a
22K before it and a 100K after it.
A missed period has been know to cause large problems.
Gerry :-)}
London, Canada

Gerald Miller wrote:fter it.

A missed period has been know to cause large problems.
Gerry :-)}
London, Canada
Yep:
That reminds me of the joke about the little boy in grade
school and the "most important word you can think of".
The kid said " period " the teacher wondered how.
The kid said the parents raised such a fuss when his
sister missed one.
Or something like that, I cant tell jokes without
messing them up. :-)
...lew...

On Sun, 16 Mar 2008 17:32:00 -0400, with neither quill nor qualm,
Gerald Miller quickly quoth:

On Sun, 16 Mar 2008 10:25:40 -0800, "T.Alan Kraus"
wrote:

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.




My bad, it is 4.7 MOhms . Bad eyes, did not see the period between the
numbers. R6 is between a transistor Q1 colector and a 741 opamp with a
22K before it and a 100K after it.
A missed period has been know to cause large problems.

1 missed period = 1 pregnant pause.

--
Death is more universal than life; everyone dies but not everyone lives.
-- A. Sachs

4.7 meg ohms - is it 1/10 watt? remember power = voltage squared /
resistance - I doubt that unless you have some very high voltages in there
(to get a tenth watt, you need about 685 volts if I didn't slip a decimal) -
suggest you look more carefully at the board - it may be a different
resistor



--
Posted via a free Usenet account from http://www.teranews.com

On Mar 17, 7:07 am, "William Noble" wrote:
4.7 meg ohms - is it 1/10 watt? remember power = voltage squared /
resistance - I doubt that unless you have some very high voltages in there
(to get a tenth watt, you need about 685 volts if I didn't slip a decimal) -
suggest you look more carefully at the board - it may be a different
resistor

--
Posted via a free Usenet account fromhttp://www.teranews.com

Hi Folks,

More info taken directly from the circuit board (posterior side
stamped in gold character text):

PD71114/01/B - ISSUE 8 (OR B)

Printed on the black dust cover which shrouds the circuit board is
marked:
ERSKINE SYSTEMS LTD
SCARBOROUGH YORKSHIRE

ELY 28.023 EM
80.42

Does this create any clarity or add to the confusion??

Thanks for the ongoing support.


darren

wrote:

On Mar 17, 7:07 am, "William Noble" wrote:

4.7 meg ohms - is it 1/10 watt? remember power = voltage squared /
resistance - I doubt that unless you have some very high voltages in there
(to get a tenth watt, you need about 685 volts if I didn't slip a decimal) -
suggest you look more carefully at the board - it may be a different
resistor

--
Posted via a free Usenet account fromhttp://www.teranews.com


Hi Folks,

More info taken directly from the circuit board (posterior side
stamped in gold character text):

PD71114/01/B - ISSUE 8 (OR B)

Printed on the black dust cover which shrouds the circuit board is
marked:
ERSKINE SYSTEMS LTD
SCARBOROUGH YORKSHIRE

ELY 28.023 EM
80.42

Does this create any clarity or add to the confusion??

Thanks for the ongoing support.


darren
Well I doubt the schematic I have access to will be any help since
it is a US drive. I forgot to look today. :-( sorry.
...lew...

And with that, often manufacturers used wattages that were thousands
of times needed (and no harm) simply to make it possible to manufacture.

Often space limits the size but simply more or equal to the wattage is required.

Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


William Noble wrote:
4.7 meg ohms - is it 1/10 watt? remember power = voltage squared /
resistance - I doubt that unless you have some very high voltages in there
(to get a tenth watt, you need about 685 volts if I didn't slip a decimal) -
suggest you look more carefully at the board - it may be a different
resistor





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