Knob for multiturn control

[Sam Goldwasser]

I have a spectrophotometer with a wavelength adjustment like this:

http://repairfaq.cis.upenn.edu/Misc/multitrn.jpg

but I'm missing the black (in this photo) knob. It must have been accidently
lost before I acquired the device - the knob is easily removed so the
calibration can be adjusted.

Does anyone have an extra knob kicking around or know where to obtain just the
knob?

Thanks.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

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[NSM]

| I have a spectrophotometer with a wavelength adjustment like this:
|
| http://repairfaq.cis.upenn.edu/Misc/multitrn.jpg
|
| but I'm missing the black (in this photo) knob. It must have been
accidently
| lost before I acquired the device - the knob is easily removed so the
| calibration can be adjusted.
|
| Does anyone have an extra knob kicking around or know where to obtain just
the
| knob?

Mouser.com amongst many others.

N

 

[Sam Goldwasser]

| I have a spectrophotometer with a wavelength adjustment like this:
|
| http://repairfaq.cis.upenn.edu/Misc/multitrn.jpg
|
| but I'm missing the black (in this photo) knob. It must have been
accidently
| lost before I acquired the device - the knob is easily removed so the
| calibration can be adjusted.
|
| Does anyone have an extra knob kicking around or know where to obtain just
the
| knob?

Mouser.com amongst many others.

Sorry if I missed where in their catalog it might be. They have the
Vishey multiturn assemblies but I don't see knobs sold separately. This is not
just some common knob for a 1/4" shaft. It snaps onto a large outer shaft
that has set screws to permit the relationship of the dial and pot or
whatever is being turned, to be calibrated.

Thanks.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

 

[NSM]

| Sorry if I missed where in their catalog it might be. They have the
| Vishey multiturn assemblies but I don't see knobs sold separately. This
is not
| just some common knob for a 1/4" shaft. It snaps onto a large outer shaft
| that has set screws to permit the relationship of the dial and pot or
| whatever is being turned, to be calibrated.

I assumed you'd replace the whole assembly. Hard to imagine you could buy
parts for this these days.

N

 

[Sam Goldwasser]

| Sorry if I missed where in their catalog it might be. They have the
| Vishey multiturn assemblies but I don't see knobs sold separately. This
is not
| just some common knob for a 1/4" shaft. It snaps onto a large outer shaft
| that has set screws to permit the relationship of the dial and pot or
| whatever is being turned, to be calibrated.

I assumed you'd replace the whole assembly. Hard to imagine you could buy
parts for this these days.

Let's see.... Cost of new assembly: $20+S&H. Cost of knob? It's probably
available because I'm probably not the first one to have come across a
device without it. There is nothing wrong the thing, that knob is desiged
to snap off so the calibration can be adjusted.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

 

[NSM]

| Let's see.... Cost of new assembly: $20+S&H. Cost of knob? It's
probably
| available because I'm probably not the first one to have come across a
| device without it. There is nothing wrong the thing, that knob is desiged
| to snap off so the calibration can be adjusted.

Tell me about it. But, 40 years ago I fixed IF transformers on tube radios
by repairing the coil inside. Now I can't even find most parts I am used to
using!

In fact, see

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5742751285

for the way things are now!!

Maybe Mouser has a suggestion? Or try the maker?

N

 

[Sam Goldwasser]

| Let's see.... Cost of new assembly: $20+S&H. Cost of knob? It's
probably
| available because I'm probably not the first one to have come across a
| device without it. There is nothing wrong the thing, that knob is desiged
| to snap off so the calibration can be adjusted.

Tell me about it. But, 40 years ago I fixed IF transformers on tube radios
by repairing the coil inside. Now I can't even find most parts I am used to
using!

In fact, see

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5742751285

for the way things are now!!

Maybe Mouser has a suggestion? Or try the maker?

Yeah, something like that, or just live with it.

Thanks.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

 

[NSM]

| > Maybe Mouser has a suggestion? Or try the maker?
|
| Yeah, something like that, or just live with it.

I know there's now an active trade in Heathkit knobs because apparently the
accountants ordered all the dies destroyed when they closed the kit lines.

Neil

 

[Ross Herbert]

Sorry if I missed where in their catalog it might be. They have the
Vishey multiturn assemblies but I don't see knobs sold separately. This is not
just some common knob for a 1/4" shaft. It snaps onto a large outer shaft
that has set screws to permit the relationship of the dial and pot or
whatever is being turned, to be calibrated.

Precisely what are the details of the shaft on which this knob must
fit? One would imagine that if this is not your standard
run-of-the-mill 1/4 inch shaft then this info is vital before anyone
can suggest a source. Unless everyone is familiar with the particular
potentiometer they don't know what the shaft looks like.

 

[DaveM]

Precisely what are the details of the shaft on which this knob must
fit? One would imagine that if this is not your standard
run-of-the-mill 1/4 inch shaft then this info is vital before anyone
can suggest a source. Unless everyone is familiar with the particular
potentiometer they don't know what the shaft looks like.

Sam,
That looks like a Spectrol style turns counting dial. See Mouser catalog
page 429 http://www.mouser.com/catalog/620/429.pdf, Part No 594-15111 and
see if that is the one you're looking for. Surplus Sales also lists one at
http://www.surplussales.com/ShaftHardware/ShaftH-2.html.

Cheers!!!
--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!

 

[Sam Goldwasser]

Precisely what are the details of the shaft on which this knob must
fit? One would imagine that if this is not your standard
run-of-the-mill 1/4 inch shaft then this info is vital before anyone
can suggest a source. Unless everyone is familiar with the particular
potentiometer they don't know what the shaft looks like.

It's probably unique to that multiturn dial, has nothing to do with the
potentiomenter or whatever it drives. Likely only available from Vishay
or whowever makes it for them.

Thanks.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

 

[Sam Goldwasser]

Sam,
That looks like a Spectrol style turns counting dial. See Mouser catalog
page 429 http://www.mouser.com/catalog/620/429.pdf, Part No 594-15111 and
see if that is the one you're looking for. Surplus Sales also lists one at
http://www.surplussales.com/ShaftHardware/ShaftH-2.html.

Yeah, both of those are probably the correct dial. Now I just wan that
knob!

Sorry, I didn't mean for everyone to spend their free or not so free time
searching for this. I just thought someone might look at it and say: "Oh,
that... I have a bunch spare knobs here somewhere."

Thanks.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

 

[Bill Janssen]

I have one or two of those counter dials in my parts box. If you still
need it send Email

Bill K7NOM [email protected]

 

[Sam Goldwasser]

I have one or two of those counter dials in my parts box. If you still
need it send Email

Thanks! Will do.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.