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  1. #31
    Join Date
    Apr 2013
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    Toowoomba Qld
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    401

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    Quote Originally Posted by Anorak Bob View Post
    It is often a lucky dip buying tooling online and probably more so when it's Chinese eBay as these two purchases will attest.

    I had been hunting for a couple of holders that would allow the use of the shallow angled corners on the CCGT 09 and 06 inserts I have in an unhanded fashion. Both holders supposedly share the same geometry given their identification codes. They don't so the search continues.....
    Sorry to be the bearer on bad news but those tools holders are exactly what they are meant to be.. or at least they are what the code on the side says they are
    The -100 on the end is the designation that means it uses the shallow corner

    My best suggestion for anyone new to insert tooling is get your hands on a catalog and see exactly what is available

    I'm guessing this is the tool holder your looking for ?
    https://www.aliexpress.com/item/SCMC...291289143.html

    vs what you bought
    https://www.aliexpress.com/store/pro...291779324.html

  2. #32
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
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    6,458

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    MS,

    I had paid for the SCMCN1212H09-100, the seller sent the incorrect holder. Thanks for the enlightenment re the 100 suffix.

    Capture 1.JPG

  3. #33
    Join Date
    Nov 2008
    Location
    Perth WA
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    71
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    6,458

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    This time the correct toolholder, purchased inexpensively from another eBay seller, arrived in today's mail. The 12 x 12 holder isn't wide enough to conceal the 80 degree corners but given that the holder was intended for use with those corners snapped off I suppose it matters little.

    https://www.ebay.com.au/itm/SCMCN121...53.m2749.l2648

    IMG_20181005_160543793 (Large).jpg IMG_20181005_160553509 (Large).jpg

  4. #34
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    3,228

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    Bob,
    I have the holder, bought on your recommendation, that holds the insert at a slight angle. I've only just loaded it with an insert after knocking the two 80 degree corners off. I'm looking forward to trying it out.
    Chris

  5. #35
    Join Date
    Nov 2008
    Location
    Perth WA
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    Another plug for the cheap pretend, Joe recommended, CCGT Korloys, intended for aluminium. I had to reduce the diameter of this 316 bar from 1 1/4" to 3/4". Took a while, 900 rpm, .015" DOC with a feed of .003" per rev. The swarf produced was in the form of a continuous nasty strand which required some dexterous, gloved handling but I got there. The best finish was at about one inch and deteriorated slightly as I approached the finished size.

    IMG_20181003_161020931 (Large).jpg

  6. #36
    Join Date
    Apr 2009
    Location
    Ballina N.S.W.
    Posts
    644

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    BT,
    That 12*12 holder that you have just received that is a bit narrow, could you use that overhang to do a light facing cut. I understand that you have purchased this holder to mainly use on your chipped edge inserts.
    Bob

  7. #37
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

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    Quote Originally Posted by Anorak Bob View Post
    Bill,


    Here are a few examples of butchered boring bars, modified to fit my boring head and to be used as end mills.

    And for Bill and Anyone else who may be interested in another useful and possibly more dexterous insert type using the same grade of "Korloy" high positive rake insert, a selection of DC.. 07.. holders. I would use these as much as the 09 inserts. ( I have yet to use the rear facing boring tool, its day with come.)



    BT
    Thanks for the advice regarding these bits - I've been using them a lot on the 9" Hercus.

    When you use those carbide bits as an end mill, is it very easy to smash them as you move into or across the workpiece ? - ie squaring up a face on the mill - cutter goes out over edge of face swings back in - hits the edge of the workpiece and smashes due to the interrupted cut ?

  8. #38
    Join Date
    Nov 2008
    Location
    Perth WA
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    Hi Bill,

    The photos below show the pretend Korloy being used as a fly cutter on some 1045 a reasonable distance from the spindle nose on my little mill. It was only a light facing cut but it was interrupted and the insert remained intact.

    DSC_8705 (Large).jpg DSC_8708 (Large).jpg DSC_8715 (Large).jpg


    Failure readily occurs if there any chance of movement in the work piece. An example is the 316 bar shown previously. Its 1 1/4" diameter wasn't perfectly round and required some light tapping at its outer end to enable the drilling of a "centred" centre hole. When it came to facing the end of the bar I used a half dead centre and a pointy DCGT 07.. pretend Korloy insert. I withdrew the centre to enable access to the very edge of the centre hole with the insert. Light contact was enough to create a wobble in the bar which resulted in snapping the end off the insert. They are fragile and need rigidity. I should have used a fixed steady.

    To conserve these inserts I most often face the end of a non flat and square bar with HSS before using carbide. They don't fare too well in heavy interrupted cuts.

    Bear in mind that these are my observations, others will undoubtedly have differing views.

    Bob.

  9. #39
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
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    After seeing your earlier post maching the stainless and your current post is there any reason why you don't use your aluminium inserts for finishing if you have to, and normal ccmt inserts for roughing.

  10. #40
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    Nov 2008
    Location
    Perth WA
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    Quote Originally Posted by pipeclay View Post
    After seeing your earlier post maching the stainless and your current post is there any reason why you don't use your aluminium inserts for finishing if you have to, and normal ccmt inserts for roughing.
    Peter,

    If I had some more robust inserts I probably would do as you suggest, but I only have the high positive rake Korloys and the some six times the price, same rake Kennametal CCGT K5025 inserts. The Kennametals are slightly less prone to breaking and were intended for use on steel unlike the Korloys.

    What CCMT inserts do use use? Brand, cost, etc....

    Bob.

  11. #41
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    Jun 2007
    Location
    sydney ( st marys )
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    For the size lathe I have and the Hercus I use mostly 060202 and 060204 Seco, Mitsubishi,Valentine, Koroly and no name, can't tell you the grades but I cover steel,stainless and cast iron.I also use the ccmt for aluminium in ccmt,tcgt and dcgt.
    Cost wise I normally go for cheapest, I generally have 400 plus inserts on hand covering turning and milling.

  12. #42
    Join Date
    Nov 2008
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    Perth WA
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    So, with Peter's suggestion of using a CCMT insert for roughing, I thought I would give it a go. The insert is of unknown Chinese origin, from a packet that they throw in when you buy cheap tooling on eBay. These inserts had previously been ignored by me because I had assumed their performance would be underwhelming

    316 at 900 rpm with about .003" DOC and a gentle manual infeed. I don't know about roughing but not too bad for finishing!

    Thank you Peter.

    IMG_20181009_153825344 (Large).jpg IMG_20181009_153917172 (Large).jpg
    Last edited by Anorak Bob; 9th Oct 2018 at 08:09 PM. Reason: Added the bit in Italics

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