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Insert Holders For Lathe

Discussion in 'TOOL JUNKIES - TOOLS & TOOLING (Love Tools? This Is Your Forum)' started by bss1, Jan 9, 2017.

  1. bss1

    bss1 United States H-M Supporter - Premium Content H-M Supporter-Premium

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    I purchased a tool holder kit from QMT with my lathe to get me started with carbide inserts. I used HSS on my previous machine. The kit came with right and left hand turning and facing holders, a threading holder, a 3/8" boring bar, and a 5/8" boring bar along with some gold and silver CCMT inserts. So far the kit has served me well except for the gold inserts which I have not found anything they seem to work well on. The tools seem to be of pretty good quality. I have some additional ccmt inserts on order and would like to have some more tool holders so I don't have to switch out inserts and keep track of which corner has been used.

    These holders were not that expensive and seem to be adequate. I am half tempted to order another set. Does anyone have any recommendations for more tool holders that would merit consideration?

    Thanks for your help.

    Brad
     
  2. Dan_S

    Dan_S Active User Active Member

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  3. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    The gold inserts (TiN coating, titanium nitride) will not work well on aluminum, the aluminum welds to the coating. Other than that, to get a good surface finish it helps to speed them up faster than HSS tools. Try 400 surface feet per minute for ordinary steel, that would be 1600 rpm on a one inch diameter part. You will also often find that very light cuts will have a poor surface finish. Try to plan your cuts so you end up with .010" or so for the final pass. See how that works for you.
     
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  4. bss1

    bss1 United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Thanks for the help guys. The glanze set looks nice, but like you said, I wish the 5/8" sets were available somewhere. Bob, I will need to try some faster speeds. I was turning much slower than 1600 RPM and maybe that will make a big difference.
     
  5. mksj

    mksj Active User H-M Supporter-Premium

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    Hi Brad,
    The brand and type of insert style coating can make a significant difference in cutting various materials. I have been using these Iscar inserts (first link) for a wide range of materials and they have worked very well, Kennametal, Korloy, etc. also makes some great inserts. I tend to avoid the Asian knock off brands, tried some and they did not hold up well and had poor cutting performance.
    http://www.ebay.com/itm/10-inserts-CCMT-09T304-SM-IC907-ISCAR-CCMT-3-1-SM-IC907-/291963135630
    http://www.ebay.com/itm/CCGT-32-51-LF-KCU10-3251-KENNAMETAL-10-INSERTS-FACTORY-PACK-/192058744292

    On aluminum, I would use a CCGT uncoated style 32.51 type insert. As you noted, it is nice to have a separate set of holders for aluminum, the inserts used tend to be very sharp (ground edge) usually uncoated and polished. They can also be used for steel for a very fine cut. I have a set of Seco WNMG holders (MWLNR and MWLNL 10-3A) I have setup for aluminum, the insert has three edges and is a bit more compact then the CCMT type so easier to get in closer when using a live center. I can take off either deep or very fine cuts with these in aluminum, bronze and softer materials. I am still using the same insert edge after a year of use, so a box of inserts will last a looong time. On steel with a light cut I can get shaving like fine steel wool with a very nice final finish.
    https://www.mscdirect.com/product/details/57128969
    https://www.mscdirect.com/product/details/57128803
    http://www.ebay.com/itm/10pcs-WNMG3...d-F-Aluminum-Korloy-1-03-011679-/151297418633

    Mark

    Holders and inserts.jpg
     
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  6. Dan_S

    Dan_S Active User Active Member

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  7. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    Work up to it. The increased speed and feed rates can be a bit frightening until you get used to them.
     
  8. bss1

    bss1 United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Thanks again guys for all the help. I did try the gold inserts at a higher speed and they did work much better.

    Mark, I ordered the first two sets of inserts you mentioned above and are awaiting their arrival.


    Sent from my iPad using Tapatalk
     

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