Electronics > Repair
HP-8569 Spectrum Analyzer Repairs
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SeanB:
Tap will work, especially a thread forming one, but that is one seriously tiny tap there. Especially the price of nearly $30 each. Tiny screws as well, and a 0 Phillips as well, but at least they will hold better than the stakes, and less stress on the material as well.
AF6LJ:

--- Quote from: xrunner on March 26, 2017, 06:43:31 pm ---Looks good so far. Maybe put a smidgen of epoxy on the pair that are loose too. Good work.

--- End quote ---
I am going to try that on the one you see in the last picture, while it is still intact the contacts are working loose. The only issue is the piece is made of ether nylon or delrin. and the epoxy will stick but not too well. I also have some CA glue and was thinking about trying it on the other rotor in a location where it won't matter if it should stick better than I thing it would.
AF6LJ:

--- Quote from: SeanB on March 26, 2017, 06:46:36 pm ---Tap will work, especially a thread forming one, but that is one seriously tiny tap there. Especially the price of nearly $30 each. Tiny screws as well, and a 0 Phillips as well, but at least they will hold better than the stakes, and less stress on the material as well.

--- End quote ---
Next month I plan on ordering the screws, a few drills and a tap.
I have 1-72 screws but I believe they are a little too large for this application.
As for taps, I had not thought about using thread forming taps, I can use thread cutting taps and use a little soap or silicon oil to lube the tap. Because of this being plastic petrochemicals are to be avoided.
cncjerry:

--- Quote from: SeanB on March 26, 2017, 06:46:36 pm ---Tap will work, especially a thread forming one, but that is one seriously tiny tap there. Especially the price of nearly $30 each. Tiny screws as well, and a 0 Phillips as well, but at least they will hold better than the stakes, and less stress on the material as well.

--- End quote ---

You can buy taps that size in a hobby store for cheap.  They aren't made for steel or aluminum but work in plastic.  Also, you don't even have to tap them;  just let the screw form the threads.  Use socket head cap screws so you can put a lot of pressure on them while twisting them in.
AF6LJ:

--- Quote from: cncjerry on March 27, 2017, 03:49:14 am ---
--- Quote from: SeanB on March 26, 2017, 06:46:36 pm ---Tap will work, especially a thread forming one, but that is one seriously tiny tap there. Especially the price of nearly $30 each. Tiny screws as well, and a 0 Phillips as well, but at least they will hold better than the stakes, and less stress on the material as well.

--- End quote ---

You can buy taps that size in a hobby store for cheap.  They aren't made for steel or aluminum but work in plastic.  Also, you don't even have to tap them;  just let the screw form the threads.  Use socket head cap screws so you can put a lot of pressure on them while twisting them in.

--- End quote ---
I am going to tap the threads, my reason for doing so is to lower the stress on the thirty plus year old plastic.
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