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Old 04-12-2021, 08:18 PM
threepiece threepiece is offline
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Default Carbide Boring Bar Bar

At the scrap yard I found two boring bars. These bars used insert tools but the bars themselves were made of carbide. Has anyone seen or used one of these?

I am curious to know the advantage of such a bar, perhaps less deflection?
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Old 04-12-2021, 08:42 PM
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Originally Posted by threepiece View Post
perhaps less deflection?
Yes that's it more on the side to stop chatter, only used solid carbide bars not with inserts.
you may also find some that are filled with some type of liquid anything to change the harmonics.
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Old 04-13-2021, 10:44 AM
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Originally Posted by threepiece View Post
At the scrap yard I found two boring bars. These bars used insert tools but the bars themselves were made of carbide. Has anyone seen or used one of these?

I am curious to know the advantage of such a bar, perhaps less deflection?
Yes they are much stiffer hence the less deflection.
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Old 04-13-2021, 10:45 AM
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.....
you may also find some that are filled with some type of liquid anything to change the harmonics.
I have used these also. They seem to work well.
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Old 04-14-2021, 09:55 AM
threepiece threepiece is offline
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Now that I think about it I suspect the higher mass of carbide over steel will also have a significant impact on harmonics.
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It started hitting the fan in the 1950's https://m.youtube.com/watch?v=nRnNDkHb0MU

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Old 04-14-2021, 10:03 AM
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Now that I think about it I suspect the higher mass of carbide over steel will also have a significant impact on harmonics.
Lead is denser than steel too haha. But something to do with hardness and stiffness.

Jeff
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Old 04-14-2021, 10:04 PM
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Lead is denser than steel too haha. But something to do with hardness and stiffness.

Jeff
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Old 04-16-2021, 07:35 AM
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If they are in the scrap bin because of a damaged or "blown" pocket, look carefully at slightly back of the pocket.

Usually the pocket is made from something like 4140, and you'll find a braze
joint (butt braze) to the main bar.

Carbide scrap is much higher than steel, and it may pay for you to unbraze
the 2 pieces for money.
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