Alex wrote:
What is the optimal solution for this problem than?
I guess thousands of people before me encountered this problem before and
successfully(at least some of them) solved it.

Leather and cork are 2 traditional materials
for this application.




"Mitch" wrote in message
...

How about using a spring washer of some sort (cone or wave type) in the
assembly to help you control the compression better? I would try this in
conjunction with an elastic stop nut (nylock).

Your Delrin washers may cold flow after awhile and get thinner though,

which

might make it difficult to keep the compression constant.
--
Cheers,

--Mitch



"Alex" wrote in message
. com...

I am using a swing arm for my home made device.
It was inspired by the swing arm lamp like this one
http://www.lightspc.com/img/g-2518.jpg

My swing arm is made of 3/8 square steel tubes and Delrin plates. Tubes

are

attached to Delrin plates by 10-32 bolts.
I use steel washers against Delrin. That should give me low friction.

The problem I have is that it's hard to control bolts tightness. If it's

not

tight enough the whole swing arm has a significant "play"
If you tight it to much it's hard to move due to high friction.

Is there a good solution for this problem?

BTW: what should I use to make sure bolts are not getting loose?

Retainer

nuts, lock washers, jamming nuts?

Thanks,
Alex