Insert boring bar information

Investigator

Investigator

H-M Supporter - Gold Member
H-M Supporter Gold Member
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Jun 8, 2016
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I have decent set of boring bars and lathe tools that all use the CCMT style/shape of insert. I have a 'need' to get a left hand boring bar, to cut outside profiles on aluminum, titanium, and stainless. I am unsure which other 'shapes' of inserts are meant for rough cutting as well as finish work. I don't really want to add too many styles or shapes of inserts to keep in inventory. However, I don't mind adding another for this specific thing.

What I want is:
  • bars/inserts with clearance to get into tight places
  • Inserts capable of taking cuts on my 12" Logan
  • Inserts that are 'readily available' (not a problem ordering and waiting, just not unobtanium)
  • Inserts that are 'affordable' (I don't mind paying for decent tools, but I'm not paying $50 per insert)
Basically outside profiles such as this:

download (1).jpg
 
In this case if you want inserts, I'd recommend a VCMT insert in an SVJCR holder. The VCMT110304 is a good all purpose steel cutting insert while the VCGT110302-AK is a great insert for non ferrous material, or fine finishing in steel and stainless. The SVJCR1212 and SVJCL1212 holders are 12mm shank (1/2") and are the right and left handed flavors of the same tool.

These are all available on AliExpress and eBay very cheap ($10 per pack of 10 inserts).

This is a fine profiling tool with great access due to the narrow insert profile. It is not, however, a strong insert and should not be used for roughing.

I use these a ton. I think I bought 50 of the VCGT110302-AK inserts on my last order.

As an added benefit, the narrow included angle decreases cutting pressure and increases accuracy on precision turned surfaces compared to a different insert. Great for bearing fits.

1621533451153.png
 
You might look at VCMT inserts and holders. These are a 35 degree diamond.
 
mikey said:
HSS.
Click to expand...

Mikey,
I probably should be, but I haven't become a fan of HSS. Not because of how it works, but because it is so much easier to pick a tool and change an insert as needed.
 
Investigator said:
Mikey,
I probably should be, but I haven't become a fan of HSS. Not because of how it works, but because it is so much easier to pick a tool and change an insert as needed.
Click to expand...

I get it but you are missing out on a powerful tooling option on a lathe that was not built for carbide.
 
" I have a 'need' to get a left hand boring bar, to cut outside profiles"
Why a boring bar? Your photo shows a right hand tool, are you needing to turn a square edge on the outboard inside end of the work?
 
Larry$ said:
" I have a 'need' to get a left hand boring bar, to cut outside profiles"
Why a boring bar? Your photo shows a right hand tool, are you needing to turn a square edge on the outboard inside end of the work?
Click to expand...

At this point, I wouldn't make a hair on an apprentice's....head. Terms and names still vex me.
 
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