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  1. #1
    Join Date
    Jun 2007
    Location
    Victoria, Australia
    Posts
    114

    Question External Threading Inserts 1.0mm to 2.5mm and 2.5mm ?

    I would like opinions on the say specific 16ER 2.5 60 ISO insert. From what I understand the 2.5 as compared to the general 1.0 to 2.5mm should be the correct form for a 2.5mm thread in shape AND depth, I assume.
    I see there are many other types for example 1.0, 1.25 1.5 and so on. Anyone use these specific threading inserts?

    I am turning a batch of M20x2.5 threads.

    Are these fixed(?) thread inserts worthwhile?

    Reading over my question it sounds a bit round and about. Hope it make enough sense.
    Regards,
    Tom

  2. #2
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    Quote Originally Posted by topari View Post
    From what I understand the 2.5 as compared to the general 1.0 to 2.5mm should be the correct form for a 2.5mm thread in shape AND depth, I assume.
    Correct. They make life easier because A) you just touch off and go to the theoretical thread depth instead of having to work out the extra for the root radius, and B) they round over the tops of the thread so you shouldn't need to break the edges with a file. They should also give you a stronger thread because the root will be radiused instead of a sharp corner.

    The downside is that you need a dozen different inserts.

    If you're going to be doing a lot of one pitch it's probably worth getting some dedicated inserts, but definitely get universals as well.

  3. #3
    Join Date
    Mar 2014
    Location
    South of Adelaide
    Posts
    1,225

    Default

    Quote Originally Posted by elanjacobs View Post
    Correct. They make life easier because A) you just touch off and go to the theoretical thread depth instead of having to work out the extra for the root radius, and B) they round over the tops of the thread so you shouldn't need to break the edges with a file. They should also give you a stronger thread because the root will be radiused instead of a sharp corner.

    The downside is that you need a dozen different inserts.

    If you're going to be doing a lot of one pitch it's probably worth getting some dedicated inserts, but definitely get universals as well.
    I couldn't have worded this better. I really like them for the oddball threads like Acme,Buttress, and trapezoidal because i hate grinding form tools.
    they are a expensive proposition for the home shop, but you can get assortment packs with a range of sizes.

  4. #4
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Tom, Guys,

    There are two basic types of threading inserts, Partial and Full Form. I generally only thread 2 mm and smaller so I tend to use Partial ones. The Full Form needs an insert for each size that you want to cut, as has been said it also creates the rounded crests and roots, so the threads are cleaner. Where the Partial ones leave sharp crests and roots, needing a secondary operation to clean up the crests. I just run a file over them.
    Best Regards:
    Baron J.

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