Hi Gary,

Thanks for all the references!

Do you have any web page and photos (?)...it would be quite interesting to
see what you have.

Take care, Meredith

On Sat, Jun 7, 2008 at 12:21 PM, Gary Lindgren 
wrote:

>  Meredith,
>
> Here is an alternative.
> http://www.vxb.com/page/bearings/CTGY/Loose-Ceramic-Balls  VXB sell ball
> bearings for bicycles. You can purchase 10 each ceramic balls made from
> Si3N4 for only 19.95 and shipping only 3.98. Try them, they are very hard.
> It seems VXB is very big in the bike racing field. Check them out. I'm now
> in process of tuning my Lehman and have the resonant frequency up to 25 sec.
>
> Gary
>
>
>
> *From:* psn-l-request@.............. [mailto:psn-l-request@...............
> *On Behalf Of *meredith lamb
> *Sent:* Saturday, June 07, 2008 10:04 AM
> *To:* psn-l@..............
> *Subject:* Pivot balls; carbide and corundum reminder
>
>
>
> Hi all,
>
> Small Parts Inc. stocks carbide, synthetic ruby (red) and sapphire (clear)
> balls that could probably
> replace (and very likely enhance the pivot) of your steel ball bearings in
> your seismometer pivots.
>
> The corundum sizes range from 1/64" up to 1/8" @ $3.45 up to $4.00 each.
> You can buy in
> quanity somewhat cheaper.  The sphericity (roundness) listed is 0.000025".
>
> http://www.smallparts.com/products/descriptions/brb.cfm
> http://www.smallparts.com/products/descriptions/BSP.cfm
>
> The tungsten carbide balls range from 1/16" up to 1/2" @ $3.25 up to $16.80
> each.  They
> have metric sizes also.  The sphericity listed is 0.0006"...quite abit less
> round than the corundum.
>
> http://www.smallparts.com/products/descriptions/btc.CFM
>
> The "big bite" of it all is their shipping/handling costs ~ $14.00 (USA)
> irregardless of the small weight.
> Their FedEx "2 day" shipping could be up to 4-5 days.  Ground shipping ~ 7
> to 10 or more days.
>
> Take care, Meredith
>
>
>
>
Hi Gary,

Thanks for all the references!  

Do you have any web page and photos (?)...it would be quite interesting to see what you have.

Take care, Meredith

On Sat, Jun 7, 2008 at 12:21 PM, Gary Lindgren <gel@.................> wrote:














Meredith,

Here is an alternative. http://www.vxb.com/page/bearings/CTGY/Loose-Ceramic-Balls 
VXB sell ball bearings for bicycles. You can purchase 10 each ceramic balls made
from Si3N4 for only 19.95 and shipping only 3.98. Try them, they are very hard.
It seems VXB is very big in the bike racing field. Check them out. I'm
now in process of tuning my Lehman and have the resonant frequency up to 25
sec.

Gary

 



From:
psn-l-request@.............. [mailto:psn-l-request@..............] On Behalf
Of meredith lamb

Sent: Saturday, June 07, 2008 10:04 AM

To: psn-l@..............

Subject: Pivot balls; carbide and corundum reminder



 

Hi all,



Small Parts Inc. stocks carbide, synthetic ruby (red) and sapphire (clear)
balls that could probably

replace (and very likely enhance the pivot) of your steel ball bearings in your
seismometer pivots.  



The corundum sizes range from 1/64" up to 1/8" @ $3.45 up to $4.00
each.  You can buy in

quanity somewhat cheaper.  The sphericity (roundness) listed is
0.000025".



http://www.smallparts.com/products/descriptions/brb.cfm

http://www.smallparts.com/products/descriptions/BSP.cfm



The tungsten carbide balls range from 1/16" up to 1/2" @ $3.25 up to
$16.80 each.  They

have metric sizes also.  The sphericity listed is 0.0006"...quite
abit less round than the corundum.



http://www.smallparts.com/products/descriptions/btc.CFM



The "big bite" of it all is their shipping/handling costs ~ $14.00
(USA) irregardless of the small weight.

Their FedEx "2 day" shipping could be up to 4-5 days.  Ground
shipping ~ 7 to 10 or more days.



Take care, Meredith