Boring Bar selection

JoeFin · Sep 20, 2008

Kind of screwed myself by not having a desent Boring bar selection in my arsenal of tools and 1 little screw shut down my whole week end.

I have a APT 2” Boring Head that came with a Shars 7/16” x 2 ¾” Boring Bar. The POS screw seized into the holder, and after I stripped out the torx wrench trying to free it, I finally threw it away.

Ordered 1 of Enco’s USA brand insert boring bars with a 1 deg rake so I could finish (some time next week ~ ) but would like to know what you guys are using for mild steel or Al. applications

4GSR · Sep 20, 2008

How are you boring, on a lathe or on the mill with a boring head?

Ken

JoeFin · Sep 20, 2008

4GSR said:
How are you boring, on a lathe or on the mill with a boring head?

Ken

On the mill with a boring head

4GSR · Sep 20, 2008

I use old H.S.S. for most applications. I also use a bar that holds an TPG style insert with good results with the right insert. I try to use an insert with no or little honed edge of .001-.002". If stringers become a problem change to a insert with built in chip breaker like a TPGF style insert. Coated inserts give a little more life per edge on inserts. I machine a lot of tough 4140-4145 steel h.t. up to 36-40HRC and some 4340 too.
Ken.

clutch · Sep 21, 2008

The other day, I needed a boring bar for the lathe I was rebulding but didn't have one. A quick look over at the bars for the Enco offset boring head had me going.

http://wess.freeshell.org/sure_machines_nice.jpg

Just one of those brazed bars.

Clutch

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Boring Bar selection

JoeFin

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4GSR

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JoeFin

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4GSR

Diamond

clutch

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