PSN-L Email List Message

Subject: RE: Tungsten Pins
From: "Gary Lindgren" gel@.................
Date: Tue, 10 Jun 2008 16:20:52 -0700


Meredith,

This morning I ordered some round carbide blanks from
http://www.centennialcarbide.com/  I don't know exactly what these will be
like when I get them. But what can be done round items is to 'center-less
grind' them. Machine shops can do this, so depending on what the surface
finish is, this is a possibility.

Gary

 

 

 

 

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of meredith lamb
Sent: Tuesday, June 10, 2008 2:55 PM
To: psn-l@..............
Subject: Re: Tungsten Pins

 

Hi Chris,

Your techniques is a total unknown to me.  How do you do your method/s?  I
can use my
imagination but...it could be quite wrong of course.  It "sounds" like a
horizontal tumbler
action of sorts.  

I presume; the copper rod (one closed end) is rotated by the outside chuck
slow drill , with the carbide and diamond paste
tumble therein?

I presume the "U" copper is stationary and the slow steel (?) drill rod
simply rotates the carbide rod laid
atop it; while the diamond paste "slurry" works?

Why just the medium grit?  What is the medium grit?

Would a drill press holding a portion of the carbide and a suitable
cloth/pad with the diamond paste thereon work abit faster
for the "selective" portion of the carbide rod used?

It seems like it is kind of a "art".

Take care, Meredith

On Tue, Jun 10, 2008 at 1:27 PM,  wrote:

In a message dated 2008/06/10, paleoartifact@......... writes:




If you want to go further and actually do ~ polishing, I note that Titan
Tool Supply, Inc. has a variety of diamond grits on small size foil and
sheets.  http://www.titantoolsupply.com/catalog.asp?prodid=506100
This diamond grit material will likely cost alot more than the carbide
rod/s.  Theres probably many others around with cheaper or better material.

 

Hi Meredith,

       Strangely enough diamond paste is not very expensive. I pay $10 for a
syringe. You use a medium grade, not a fine grade. Titan products seem to be
overpriced.
       You can use a copper tube to polish a Tungsten Carbide rod, OK. This
takes quite a while by hand, but using a slow drill to hold the rod is quite
practicable. Alternatively, wrap a strip of Cu sheet in a U around a
suitable drill shank.

       Regards,

       Chris 

 












Meredith,

This morning I ordered some round carbide blanks from http://www.centennialcarbide.c= om/  I don’t know exactly what these will be like when I get them. But = what can be done round items is to ‘center-less grind’ them. = Machine shops can do this, so depending on what the surface finish is, this is a = possibility.

Gary

 

 

 

 

From:= psn-l-request@.............. [mailto:psn-l-request@............... On = Behalf Of meredith lamb
Sent: Tuesday, June 10, 2008 2:55 PM
To: psn-l@..............
Subject: Re: Tungsten Pins

 

Hi Chris,

Your techniques is a total unknown to me.  How do you do your method/s?  I can use my
imagination but...it could be quite wrong of course.  It "sounds" like a horizontal tumbler
action of sorts. 

I presume; the copper rod (one closed end) is rotated by the outside = chuck slow drill , with the carbide and diamond paste
tumble therein?

I presume the "U" copper is stationary and the slow steel (?) = drill rod simply rotates the carbide rod laid
atop it; while the diamond paste "slurry" works?

Why just the medium grit?  What is the medium grit?

Would a drill press holding a portion of the carbide and a suitable = cloth/pad with the diamond paste thereon work abit faster
for the "selective" portion of the carbide rod used?

It seems like it is kind of a "art".

Take care, Meredith

On Tue, Jun 10, 2008 at 1:27 PM, <ChrisAtUpw@.......> = wrote:

In a message dated 2008/06/10, paleoartifact@......... writes:


If you want to go further and actually do ~ polishing, I note that Titan = Tool Supply, Inc. has a variety of diamond grits on small size foil and sheets.  http://www.titantoolsupply.com/catalog.asp?prodid=3D506= 100
This diamond grit material will likely cost alot more than the carbide rod/s.  Theres probably many others around with cheaper or better material.

 

Hi Meredith,

       Strangely enough diamond paste is = not very expensive. I pay $10 for a syringe. You use a medium grade, not a fine = grade. Titan products seem to be overpriced.
       You can use a copper tube to polish = a Tungsten Carbide rod, OK. This takes quite a while by hand, but using a slow = drill to hold the rod is quite practicable. Alternatively, wrap a strip of Cu = sheet in a U around a suitable drill shank.

       Regards,

       Chris

 


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