|
Posted by Larry Jaques on March 17, 2008, 12:16 am
Please log in for more thread options
On Sun, 16 Mar 2008 17:32:00 -0400, with neither quill nor qualm,
>On Sun, 16 Mar 2008 10:25:40 -0800, "T.Alan Kraus"
>
>>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
|
|
Posted by Spehro Pefhany on March 14, 2008, 3:32 pm
Please log in for more thread options
On Fri, 14 Mar 2008 10:13:07 -0800, "T.Alan Kraus"
>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
milliohms maybe?
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
|
|
Posted by Martin H. Eastburn on March 14, 2008, 10:10 pm
Please log in for more thread options 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"
>
>> 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
>
>
> milliohms maybe?
> Best regards,
> Spehro Pefhany
----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.pronews.com The #1 Newsgroup Service in the World! >100,000 Newsgroups
---= - Total Privacy via Encryption =---
|
| Similar Threads | Posted | | Really fed up with my Bridgeport | December 25, 2006, 2:03 pm |
| Bridgeport FS | March 1, 2007, 1:22 pm |
| HELP! Value of a Bridgeport | March 3, 2007, 9:01 pm |
| Bridgeport "Kit"? | July 5, 2007, 2:55 pm |
| Old Bridgeport fate | July 6, 2006, 5:43 am |
| Bridgeport Gearing | October 19, 2006, 7:29 am |
| Bridgeport questions | October 24, 2006, 7:53 pm |
| Bridgeport update & ??? | October 25, 2006, 8:10 pm |
| Bridgeport Question | November 9, 2006, 6:01 pm |
| FA: Bridgeport Boss 5 CNC | November 10, 2006, 2:36 pm |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
>