PSN-L Email List Message

Subject: RE: Pivot balls; carbide and corundum reminder
From: "Gary Lindgren" gel@.................
Date: Sat, 7 Jun 2008 11:27:50 -0700


Meredith,

Here is a listing of the various ceramic hardness values.
http://www.ceresist.com/ceramicmaterials/hardness.htm 

Looks as if SiC is the hardest, I guess I should get some of those.

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
 















Meredith,

Here is a listing of the various ceramic hardness values. = http://www= ..ceresist.com/ceramicmaterials/hardness.htm

Looks as if SiC is the hardest, I guess I should get some = of those.

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
 



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