Boring Bars

[SpecialtyTool]

We are needing to bore some thru holes on a lathe 6" deep. Will a 1" solid carbide work? We are using a 1-1/2" steel boring bar and we are getting a lot of chatter. I think a 1" carbide bar extended 6" with 4" held in the turret should be no problem. Anyone agree?

[SpecialtyTool]

A36 Mild steel by the way.

[GoetzInd]

Take a look at ultra-dex heavy metal boring bars. We use these for long reach apps and they do really well and a lot cheaper and more durable than carbide. Mitsubishi does some as well.

 

Mike

[#Rekd™]

Ultra-Dex lists there boring bars as such:

 

Heavy Metal 6:1 ratio

Solid Carbide 8:1 Ratio

Steel 4:1 ratio

 

So a 1" carbide bar should work up to 8" in length. Tool geometry is important as well, I would contact the rep to get a proper tool.

[Reko]

If you are roughing, go with heavy metal bars... finishing, use carbide.

 

Be careful with the carbide... they are expensive and brittle and will break more easily than you think... and the sizes you are talking about... that much carbide is pricey.

[SpecialtyTool]

If you are roughing, go with heavy metal bars... finishing, use carbide.

 

Be careful with the carbide... they are expensive and brittle and will break more easily than you think... and the sizes you are talking about... that much carbide is pricey.

 

Im just finishing with it. Parts will be roughed (drilled) within .015-.025 per side, welded into a flange, and then finished. And yes, $650 quoted is a bit but when I watched a guy polishing a bore for 2 min longer than quoted I don't think its hard to justify. Especially when Im going to be running over 1000 of these hubs every month. I have 12 different size bores and this bar should do 11 of them. It should never leave the machine as far as Im concerned.

[#Rekd™]

I found Ultra-Dex's pricing to be pretty good on the solid carbide bars.