practical lubricity
 

The car holder for my GPS navigation system uses a ball-and-socket joint. It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply too
much friction, both static and moving.

I've tried silicone spray lube, but it doesn't do much good. I've thought of
lithium grease, but... Nah.

Any suggestions?

Thanks in advance.

--
"We already know the answers -- we just haven't asked the right
questions." -- Edwin Land

practical lubricity
 

On Sun, 13 Nov 2011 08:30:07 -0800, "William Sommerwerck"
wrote:

The car holder for my GPS navigation system uses a ball-and-socket joint. It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply too
much friction, both static and moving.

I've tried silicone spray lube, but it doesn't do much good. I've thought of
lithium grease, but... Nah.

Any suggestions?

Nope. If you do find a suitable lubricant, there won't be enough
friction to hold it in place when the car bounces down the road. I
think taking the ball and socket apart, and cleaning or polishing the
mechanism, will probably work better. If you must lubricate the
plastic, I suggest something dry, such as talcum powder.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

practical lubricity
 

On Sun, 13 Nov 2011 08:30:07 -0800, "William Sommerwerck"
wrote:

The car holder for my GPS navigation system uses a ball-and-socket joint. It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply too
much friction, both static and moving.

I've tried silicone spray lube, but it doesn't do much good. I've thought of
lithium grease, but... Nah.

Any suggestions?

Thanks in advance.
I use this stuff for locks and clockwork indicators called "TRI-FLOW".
I know that Teflon oils seem to be all hype but the stuff actually
works better than any other oil I've used for locks. Doesn't gum up
the locks and penetrates well. Maybe it will also help with the static
friction problem you have. Stiction is a problem with some mechanical
measuring instruments I use in the machine shop because they get oil
on them and gum up. Clock oil doesn't work as well as Tri-Flow does
for these tools. I think it's because the solvent in the stuff allows
it to penetrate better and the residue left behind isn't very tacky.
Eric

practical lubricity
 

"Jeff Liebermann" wrote in message
...
On Sun, 13 Nov 2011 08:30:07 -0800, "William Sommerwerck"
wrote:

The car holder for my GPS navigation system uses a ball-and-socket joint.
It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply
too
much friction, both static and moving.

've tried silicone spray lube, but it doesn't do much good. I've thought
of
ithium grease, but... Nah.
Any suggestions?

Nope. If you do find a suitable lubricant, there won't be enough
friction to hold it in place when the car bounces down the road. I
think taking the ball and socket apart, and cleaning or polishing the
mechanism, will probably work better. If you must lubricate the
plastic, I suggest something dry, such as talcum powder.

Interesting thought.

One can imagine a thixotropic lubricant -- though whether any exists...

practical lubricity
 

I use this stuff for locks and clockwork indicators called "TRI-FLOW".
I know that Teflon oils seem to be all hype but the stuff actually
works better than any other oil I've used for locks. Doesn't gum up
the locks and penetrates well. Maybe it will also help with the static
friction problem you have. Stiction is a problem with some mechanical
measuring instruments I use in the machine shop because they get oil
on them and gum up. Clock oil doesn't work as well as Tri-Flow does
for these tools. I think it's because the solvent in the stuff allows
it to penetrate better and the residue left behind isn't very tacky.

Thanks for the suggestion. I'll look for it.

By the way, I neglected to mention that the ball-and-socket is plastic, with
a metal band in the socket.

practical lubricity
 

On Sun, 13 Nov 2011 09:43:07 -0800, "William Sommerwerck"
wrote:

"Jeff Liebermann" wrote in message
.. .
On Sun, 13 Nov 2011 08:30:07 -0800, "William Sommerwerck"
wrote:

The car holder for my GPS navigation system uses a ball-and-socket joint.
It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply
too
much friction, both static and moving.

've tried silicone spray lube, but it doesn't do much good. I've thought
of
ithium grease, but... Nah.
Any suggestions?

Nope. If you do find a suitable lubricant, there won't be enough
friction to hold it in place when the car bounces down the road. I
think taking the ball and socket apart, and cleaning or polishing the
mechanism, will probably work better. If you must lubricate the
plastic, I suggest something dry, such as talcum powder.

Interesting thought.
One can imagine a thixotropic lubricant -- though whether any exists...

I think you mean something like corn starch.
http://en.wikipedia.org/wiki/Non-Newtonian_fluid
It won't work because you can't maintain much pressure on the fluid
with thin plastic parts. Eventually, the plastic will creep, the
pressure will be relieved, the lubricants viscosity drops, and your
map display falls over.

I've used talcum powder for various unconventional lubricating
applications. Out of the bottle, the particles are rounded. However,
pressure is applied, they flatten, creating addition friction. When
applied to your ball and socket, it will initially act as a roller
lube. When you apply pressure, it almost becomes an abrasive (without
defacing the plastic surface. The problem is that there's no
resiliance. Once you clamp down on the powder, it's permanent. If
you miss, and have to move it later, you might as well tear it apart
and apply a fresh load of talcum powder. The right stuff might be
tiny rubber balls, but I don't know where to get those (or make them).
Maybe try some pink eraser dust or shavings.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

practical lubricity
 

On Sun, 13 Nov 2011 09:45:22 -0800, "William Sommerwerck"
wrote:

I use this stuff for locks and clockwork indicators called "TRI-FLOW".
I know that Teflon oils seem to be all hype but the stuff actually
works better than any other oil I've used for locks. Doesn't gum up
the locks and penetrates well. Maybe it will also help with the static
friction problem you have. Stiction is a problem with some mechanical
measuring instruments I use in the machine shop because they get oil
on them and gum up. Clock oil doesn't work as well as Tri-Flow does
for these tools. I think it's because the solvent in the stuff allows
it to penetrate better and the residue left behind isn't very tacky.

Thanks for the suggestion. I'll look for it.

By the way, I neglected to mention that the ball-and-socket is plastic, with
a metal band in the socket.

Then I'd be careful using my suggestion because the solvent in the
stuff may attack the plastic. I assumed metal parts. There is some
other stuff I use on rubber parts, like the window gaskets in my car
and truck. It's a dry lube made by, I think, Borden. Anyway it's some
type of white looking powder suspended or dissolved in some type of
fast drying liquid or solvent and comes in a spray can. I sprayed the
stuff on the rubber gaskets and now the windows go up and down much
easier. Of course it also may attack the plastic.
Eric

practical lubricity
 

By the way, I neglected to mention that the ball-and-socket is plastic,
with a metal band in the socket.

Then I'd be careful using my suggestion because the solvent in the
stuff may attack the plastic. I assumed metal parts. There is some
other stuff I use on rubber parts, like the window gaskets in my car
and truck. It's a dry lube made by, I think, Borden. Anyway it's some
type of white looking powder suspended or dissolved in some type of
fast drying liquid or solvent and comes in a spray can. I sprayed the
stuff on the rubber gaskets and now the windows go up and down much
easier. Of course it also may attack the plastic.

"If it's Borden... it's got to be good."

I've also thought of using graphite powder.

practical lubricity
 

Jeff Liebermann wrote:
On Sun, 13 Nov 2011 08:30:07 -0800, "William Sommerwerck"
wrote:

The car holder for my GPS navigation system uses a ball-and-socket joint. It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply too
much friction, both static and moving.

I've tried silicone spray lube, but it doesn't do much good. I've thought of
lithium grease, but... Nah.

Any suggestions?

Nope. If you do find a suitable lubricant, there won't be enough
friction to hold it in place when the car bounces down the road. I
think taking the ball and socket apart, and cleaning or polishing the
mechanism, will probably work better. If you must lubricate the
plastic, I suggest something dry, such as talcum powder.


What he said...
Assume you've tried the obvious technique of applying rotation to the
ball joint while implementating the desired translation?

practical lubricity
 

"mike" wrote in message
...

Assume you've tried the obvious technique of applying rotation
to the ball joint while implementating the desired translation?

Of course. The socket is designed for tightness at the expense of ease of
movement.

practical lubricity
 

William Sommerwerck wrote:
"mike" wrote in message
...

Assume you've tried the obvious technique of applying rotation
to the ball joint while implementing the desired translation?

Of course. The socket is designed for tightness at the expense of ease of
movement.


And you want to defeat that design objective that keeps the device
stable under vibration.

practical lubricity
 

"mike" wrote in message
...
William Sommerwerck wrote:
"mike" wrote in message
...

Assume you've tried the obvious technique of applying rotation
to the ball joint while implementing the desired translation?

Of course. The socket is designed for tightness at the expense
of ease of movement.

And you want to defeat that design objective that keeps the device
stable under vibration.

Wrong assumption. You're assuming that making the joint easier to move
smoothly will necessarily cause it to change position under normal use. My
Focus does not vibrate, except on rough road.

practical lubricity
 

William Sommerwerck wrote in message
...
The car holder for my GPS navigation system uses a ball-and-socket joint.
It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply
too
much friction, both static and moving.

I've tried silicone spray lube, but it doesn't do much good. I've thought
of
lithium grease, but... Nah.

Any suggestions?

Thanks in advance.

--
"We already know the answers -- we just haven't asked the right
questions." -- Edwin Land




I would try locksmith's dry lubricant - ground graphite or talcum powder ,
at least no solvents going to attack the plastic

practical lubricity
 

On 11/14/2011 03:56 AM, N_Cook wrote:
William wrote in message
...
The car holder for my GPS navigation system uses a ball-and-socket joint.
It
holds the unit without any slipping -- but no matter how much I fuss with
it, I can never get it into exactly the position I want. There's simply
too
much friction, both static and moving.

I've tried silicone spray lube, but it doesn't do much good. I've thought
of
lithium grease, but... Nah.

Any suggestions?

Thanks in advance.

--
"We already know the answers -- we just haven't asked the right
questions." -- Edwin Land




I would try locksmith's dry lubricant - ground graphite or talcum powder ,
at least no solvents going to attack the plastic



The old slide rule trick is to loosen with graphite and tighten with
chalk dust.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

practical lubricity
 

The old slide rule trick is to loosen with graphite
and tighten with chalk dust.

I used to carry a mini tube of Vaseline to lube my slide rule.