Another interesting Tektronix web site


John Williams
 

Here is A link to the Tektronix portion of Julian Bunn website. Julian is a long-time enthusiast who is at Caltech.

http://pcbunn.caltech.edu/jjb/Tektronix/tektronix.htm


ROLYNN PRECHTL K7DFW
 

Here is A link to the Tektronix portion of Julian Bunn website. Julian is a long-time enthusiast who is at Caltech.

http://pcbunn.caltech.edu/jjb/Tektronix/tektronix.htm

=========================================================

He recommends this for rejuvenation of the rubber fan mounts on the 500 series. Worth a try.

" I rejuvenated the rubber fan mounts by the following method:

Soak in olive oil for 1/2 hour
Place in boiling water for 5 minutes
Thoroughly dry and clean
Re-attach metal mounting plates using super glue.

The rubber felt like new after this process".


Rolynn
Clatskanie, OR


Dave Wise
 

I performed this procedure on one of the chassis cushion mounts in my Type D plugin. (Tek P/N 348-0007-00. 348-0087-00 might work too.)

No effect.

Must be a different rubber.

Unless someone has another idea, I will look at cushions made for RC helicopter camera mounts.
This one caught my eye:

https://www.amazon.com/HONBAY-Vibration-Rubber-Fright-Controller/dp/B073LPTHCL/ref=pd_di_sccai_4/130-3441475-1604467
HONBAY 24pcs RC Anti Vibration Rubber Balls for Fright Controller Gimbal

On closer look, it's far from ideal. The parts are 13mm overall height, 8mm overall diameter, 6mm hole diameter, approximately 7mm chassis spacing.
The mounting holes in Type D are themselves 8mm diameter (5/16") so the cushions will slip free unless the chassis and subchassis are modified, perhaps by gluing down washers with 6mm ID.
Also the Type D chassis are spaced on approximately 10mm centers, not 7mm, so glue the washer on the bottom side of the upper and the top side of the lower.

I'll report results in a month or so.


Harvey White
 

Could you make a mold and cast some sort of rubber?

Harvey

On 6/19/2021 10:10 PM, Dave Wise wrote:
I performed this procedure on one of the chassis cushion mounts in my Type D plugin. (Tek P/N 348-0007-00. 348-0087-00 might work too.)

No effect.

Must be a different rubber.

Unless someone has another idea, I will look at cushions made for RC helicopter camera mounts.
This one caught my eye:

https://www.amazon.com/HONBAY-Vibration-Rubber-Fright-Controller/dp/B073LPTHCL/ref=pd_di_sccai_4/130-3441475-1604467
HONBAY 24pcs RC Anti Vibration Rubber Balls for Fright Controller Gimbal

On closer look, it's far from ideal. The parts are 13mm overall height, 8mm overall diameter, 6mm hole diameter, approximately 7mm chassis spacing.
The mounting holes in Type D are themselves 8mm diameter (5/16") so the cushions will slip free unless the chassis and subchassis are modified, perhaps by gluing down washers with 6mm ID.
Also the Type D chassis are spaced on approximately 10mm centers, not 7mm, so glue the washer on the bottom side of the upper and the top side of the lower.

I'll report results in a month or so.





Keith
 

re: fan vibration isolators, p/n 348-008 and similar

Well, I've looked at these some already, and I am about to have to address this on my 575 rebuild. I'm toying with the idea of adapting Sorbothane and forming my own version of isolator replacements for Tek 348-008. I know it won't be original, but Sorbothane will outperform rubber any day of the week for vibration isolation. I hate fan vibration noise.

Sorbothane is fairly easy to find and comes in different elasticity values. Here are examples;

As equipment feet: https://www.scientificindustries.com/shock-absorbing-feet-microplate-genie-4.html?gclid=CjwKCAjw8cCGBhB6EiwAgORey0tSiIJkrFdHmkW8wP__jf58xSHbQzOQ1nzrseGZL9EtzNimuAH6jBoCWScQAvD_BwE

As disc bushings adaptable to various uses; https://www.amazon.com/Isolate-Sorbothane-Vibration-Isolation-Circular/dp/B00X6R47N0/ref=asc_df_B00X6R47N0/?tag=hyprod-20&linkCode=df0&hvadid=343351339353&hvpos=&hvnetw=g&hvrand=13667055082900351822&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9025850&hvtargid=pla-692662753862&psc=1&tag=&ref=&adgrpid=67841369743&hvpone=&hvptwo=&hvadid=343351339353&hvpos=&hvnetw=g&hvrand=13667055082900351822&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9025850&hvtargid=pla-692662753862

I've used this before. It is really a much better material than Buna-N rubber.

Of course, we have to accept that it won't look quite NOS original, which will definitely cost us points at the Concours d'Elegance judging events for our restored scopes. :-)


Dave Wise
 

Keith, if you go ahead with your idea I will be looking forward to a report.
Meanwhile, if you want to save your strength for other projects, the 348-008 fan mount used in the 500 series can be drop-in replaced by McMaster-Carr part number
9376K15 or 9213K11. One is neoprene, the other natural rubber. Same dimensions and hardness.
I bought a bag years ago and was giving them away, but my supply has finally dwindled.
There are dozens if not hundreds of similar parts sold at Amazon and so on.

Dave Wise

From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Keith via groups.io
Sent: Monday, June 21, 2021 6:16 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Another interesting Tektronix web site

re: fan vibration isolators, p/n 348-008 and similar

Well, I've looked at these some already, and I am about to have to address this on my 575 rebuild. I'm toying with the idea of adapting Sorbothane and forming my own version of isolator replacements for Tek 348-008. I know it won't be original, but Sorbothane will outperform rubber any day of the week for vibration isolation. I hate fan vibration noise.

Sorbothane is fairly easy to find and comes in different elasticity values. Here are examples;

As equipment feet: https://www.scientificindustries.com/shock-absorbing-feet-microplate-genie-4.html?gclid=CjwKCAjw8cCGBhB6EiwAgORey0tSiIJkrFdHmkW8wP__jf58xSHbQzOQ1nzrseGZL9EtzNimuAH6jBoCWScQAvD_BwE<https://www.scientificindustries.com/shock-absorbing-feet-microplate-genie-4.html?gclid=CjwKCAjw8cCGBhB6EiwAgORey0tSiIJkrFdHmkW8wP__jf58xSHbQzOQ1nzrseGZL9EtzNimuAH6jBoCWScQAvD_BwE>

As disc bushings adaptable to various uses; https://www.amazon.com/Isolate-Sorbothane-Vibration-Isolation-Circular/dp/B00X6R47N0/ref=asc_df_B00X6R47N0/?tag=hyprod-20&linkCode=df0&hvadid=343351339353&hvpos=&hvnetw=g&hvrand=13667055082900351822&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9025850&hvtargid=pla-692662753862&psc=1&tag=&ref=&adgrpid=67841369743&hvpone=&hvptwo=&hvadid=343351339353&hvpos=&hvnetw=g&hvrand=13667055082900351822&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9025850&hvtargid=pla-692662753862<https://www.amazon.com/Isolate-Sorbothane-Vibration-Isolation-Circular/dp/B00X6R47N0/ref=asc_df_B00X6R47N0/?tag=hyprod-20&linkCode=df0&hvadid=343351339353&hvpos=&hvnetw=g&hvrand=13667055082900351822&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9025850&hvtargid=pla-692662753862&psc=1&tag=&ref=&adgrpid=67841369743&hvpone=&hvptwo=&hvadid=343351339353&hvpos=&hvnetw=g&hvrand=13667055082900351822&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9025850&hvtargid=pla-692662753862>

I've used this before. It is really a much better material than Buna-N rubber.

Of course, we have to accept that it won't look quite NOS original, which will definitely cost us points at the Concours d'Elegance judging events for our restored scopes. :-)