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30th Nov 2020, 09:35 AM #1Senior Member
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- Jun 2007
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- Victoria, Australia
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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
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30th Nov 2020, 05:30 PM #2Gear expert in training
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- Aug 2008
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- Melbourne
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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.
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30th Nov 2020, 06:54 PM #3Diamond Member
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- Mar 2014
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- South of Adelaide
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- 1,225
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1st Dec 2020, 01:02 AM #4
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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