Products > Test Equipment
Fool for the 8656A Sig Gen
jrharley:
Not far off swainster, thanks!
It seems that the right size for replacement has an outside diameter of 5-6mm and an inside diameter of 2.5-3mm. The tricky part in this case is the cross section of the ring. Based on my measurements of the area at the tip of the fork that retains the ring, the 2 o-rings I'll be replacing the original with, should not be much more than 1mm thick. I've been experimenting with some rings from the stash that fit pretty well, but they're too thick to place two, side by side, at around 1.7mm. The original o-ring was a single ring, with a slot around the circumference. I think the actuator plate from the solenoid rode in this slot on the o-ring, and either pushed against one side, or pulled against the other, to slide the fork.
It'll take a little doing to find the right rings, but we'll get 'em. Could be time for an account at McMaster-Carr...... :) (The kits all over the interwebs aren't all that appealing so far).
JRH
Tony_G:
+1 on McMaster-Carr - Have bought from them before and they've always delivered quality parts - This is something that I guess, my economic privilege, allows - Buy from professional providers and you'll get what you order - Buy from eBay or Ali and you'll get what you pay for, maybe...
TonyG
jrharley:
HP 8656A drama continues... :)
McMaster - Carr is awesome. I could quickly order 3 different sizes of o-rings, 100 to a pack, for less than $20 including shipping, delivered next day! The "Goldilocks" ring was right where expected in the lot and fit good.
Still too thick though. :( Getting 2 of them to fit on the fork was not happenin'.
The original part is really best described as a "Grommet". But it's a pretty small one. Haven't seen anything that would be a direct "drop in". No worries though, I think. I found that I could shave the o-rings down to about 1/2 their width and get a pretty good fit. Things are seeming to fit together pretty well in the cavities.
Pics on the way.
JRH
Tony_G:
I had no idea that there would be a store like this but maybe you can find something here
https://www.theoringstore.com/store/
TonyG
jrharley:
Thanks Tony_G! I did come across that company as well. Could be an option. Their size classifications and descriptions are a little impenetrable, but they could ultimately be the right source, we'll see.
Meanwhile, I'm just about re-fitted with the existing assembly. I've figured out a way to use the o-rings I have, into at least a shot at getting something to work.
Update pics attached.
Thanks always for the feedback and interest!
JRH
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