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need suggestions for a good boring bar

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  • need suggestions for a good boring bar

    I have a nice set of Borite 3/4 boring bars for my vertical mill. They work great, are very sturdy, but the price of inserts hurt each time I have to buy some ($3.69-4.29 depending on radius and assuming I buy atleast 10 of each at a time). I've been looking at some bars made by APT

    http://www.shopatcdirect.com/default...up=Boring+Bars

    I'm willing to spend some money for a decent bar or set of bars, but I don't want to spend good money on bad tools. I'm open to all suggestions, but prefer that they come from experience.

    James

  • #2
    I use the APT bars at the high school I teach at. the TPU/G 222 and 322 1/2 shank and 3/4 shank type. I have been using them for near on 15 years now, they are dependable and work well.

    The best statement I can make - they are nearly "student proof". Enough said. I keep coming back for more to add to the collection, not to replace.
    CCBW, MAH

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    • #3
      One suggestion with boring bars, most always you want one with positive rake. I have seen carbide insert bars that were negative rake, and they are chatter prone. Positive rake for boring bars is the best. Also, set them slightly above center or they will rub and flex.
      --Doozer
      DZER

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      • #4
        One thing for shure the TPU and TPG are the cheapest inserts you can buy and work good . Have not used that bar but look`s good to me ,but look`s a little large to me . I use more small bars than big one `s .But depends on what you build . I am more likely to bore a 1/2 inch hole 3 inches deep than a 2 inch hole 1 inch deep.
        Every Mans Work Is A Portrait of Him Self
        http://sites.google.com/site/machinistsite/TWO-BUDDIES
        http://s178.photobucket.com/user/lan...?sort=3&page=1

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        • #5
          I got some fine indexable boring bars from Mari Tool - they're solid carbide, long and rigid - they claim a 10:1 extension is possible even for boring steel:

          http://www.maritool.com/Indexable-To...duct_info.html
          Cheers,

          Frank Ford
          HomeShopTech

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          • #6
            Originally posted by Frank Ford
            I got some fine indexable boring bars from Mari Tool - they're solid carbide, long and rigid - they claim a 10:1 extension is possible even for boring steel:

            http://www.maritool.com/Indexable-To...duct_info.html

            That is good but the price is too much for me. I can show some good bars to but HSM can`t afford them . Are most can`t are want. Two of these one cut in half for a boring head will just about do every thing. A Sandvik SI-sclcr 8-3 .
            Every Mans Work Is A Portrait of Him Self
            http://sites.google.com/site/machinistsite/TWO-BUDDIES
            http://s178.photobucket.com/user/lan...?sort=3&page=1

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            • #7
              I have one of the 3/4" APT boring bars that uses TPG 322 inserts. I bought it because I already have 322 inserts for my aloris 16 holder. I really like mine. I just finished a job boring a batch of 316ss parts boring and it held up great. You can get the inserts from enco on sale for $1 each. You can't get much cheaper than that for three cutting edges.

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