|
The knob is actually several parts: 366-1385-00 (or 366-1385-01+366-0293-01 for SN B090000-B142149) is the outer grey knob, and 354-0413-00 is the transparent skirt. So it makes a difference what the serial number of your instrument is.
Sadly, according to the RPR-knobs&pushbuttons, these were only used on the 485, which makes finding a spare one unlikely. How much of the knob plastic remains on your knob? (not to ask an indelicate question) It might be possible to make a mold from the existing plastic and fashion a patch from the casting. This is something that I have been experimenting with, though I have not yet struck upon a method that produces perfect results. -- Jeff Dutky |
|
The VOLTS/DIV knobs are part number 366-1338-00. They were also only used on the 485, so again, hard to find spares lying around (but maybe not impossibly, as twice as many VOLTS/DIV knobs were produced as were TIME/DIV knobs).
Depending on how much of the plastic remains on the knob you have you may still be able to make a casting from which a patch could be constructed. My current method uses plasticine modeling clay as the mold, and common JB Weld epoxy to make the casting. I have a lot of trouble with bubbles and narrow-walled parts, but if I had a VOLTS/DIV knob that was cracked in half I think that I could do a fair job of casting the half-shell. Once you have the plastic part you can file it down to fit in the gaps of the original knob. -- Jeff Dutky |
|
Jeff-
toggle quoted message
Show quoted text
when we we did silicone molds for wafer handling we put the assembly in a vacuum chamber to remove all bubbles/voids during cure. might work with epoxy? seems to be about the same consistency, no way can you use the fast set epoxy though. another possibility is put the casting on a vibrator for a while to settle the contents. ¸é±ð²Ô¨¦±ð On 3/30/22 4:20 PM, Jeff Dutky wrote:
The VOLTS/DIV knobs are part number 366-1338-00. They were also only used on the 485, so again, hard to find spares lying around (but maybe not impossibly, as twice as many VOLTS/DIV knobs were produced as were TIME/DIV knobs). |
|
Steve,
If you could get a measurement of the diameter of the inner aluminum core of the VOLTS/DIV knob I can try making a casting from one of the knobs on my 485. If that goes even passably well I can send you the resulting plastic shell which you could use to mend your shattered plastic. I expect that the casting will not fit flush against the metal core, but that can be remedied with some needle files and manual effort. I have done something similar to repair the VOLTS/DIV knobs on a 475A, but I used the remains of another knob. I've been working on my casting techniques because I would like to be able to repair such broken knobs without reducing the overall supply. -- Jeff Dutky |
Bob Haas
Craig Cramb