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Inserts for threading 16ER ISO and internal grooving inserts

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PekkaNF:
I have got outside threading tool + insert from RDG, not happy with insert. I have some better external/internal threading tools, but I don't know which inserts to buy.

I would like to stick 16ER and 16NR inserts, because there is pretty good selection for different thread profiles. But which brand and where? Big tamale would be selection of full profile metric threading inserts.

Annother thing is groovin inserts, specially internal grooving. This far I have used very happily Mesa tools stuff, but when I need precise width I need to grind the insert.

I have been considering MGMN inserts and bars for them, but three internal/external tool + inserts will add up in price and still I would be grinding the inserts.

I have three or four nearly unused SECO:n internal grooving bars, but only one isert for each. Can't find tha inserts for them. 16 mm internal groving bar has a ID of SNP0016M9 and the bit looks much like a CCMT09 insert, but it is more square and has a projection sticking out of it. The insert is nice to sharpen and modify. Just can't find them.

Very temped to go back to HSS, but they don't hold as well as inserts.

Suggestions?

Pekka

seadog:
I use the same inserts and get them from Shop APT in Edinburgh. Not the cheapest around but I have no complaints.

sparky961:
Grinding grooving inserts to width is something I commonly do professionally, so there's even less wrong with it for a hobby.  The thing with grooves is that you can make a wider groove with a narrow insert but not vice versa (duh!).  For a manual machine, this may require lots of time, patience, and sometimes "clenching" moments while you can't see the tool deep in a hole.  But with CNC I'll often purposely select a narrower tool and use multiple plunges to get the required width.  A huge advantage to this is that there is less of the cutting tool in contact with the work so the tendency to chatter is significantly reduced.  I've never seen the square style with the projection.  Most of what I use looks something like the following:



I use only two threading insert sizes at work, and have internal and external versions.  So far I've done everything from M6x1 up to ... actually, I'm not sure what the biggest might be.  I'll guess something like M42x2 maybe?  It's the pitch that's more important here than the diameter.  Most often the larger sizes I work with are finer pitches, so this helps reduce the max depth the insert will be cutting.  I've probably done 3mm pitch but can't remember a specific case.  The point of my rambling is that if you do away with the idea of  "full profile" insert, it is much more flexible.  The most useful thing I ever learned for threading was to religiously use Machinery's Handbook for thread data.  Run it as low as you can on the major diameter, and as high as you can on the pitch diameter - all within the allowable tolerances, and what works for your application.  Your threads will look and function much better and be easier to cut if you follow this advice.

sparky961:
While we're on the topic (sort of), I have to say that for grooves that aren't too deep I absolutely love the Sandvik Corocut MB (Mini Bar).  The price is probably outside of the realm of hobby use, but if you want something that "just works, period", this is the ticket.



Lots of different inserts of various shapes are available.  though I'm actually surprised they don't list one for internal threading.

http://www.sandvik.coromant.com/en-gb/products/corocut_mb/Pages/default.aspx

Surely you'd get a discount from Sandvik for living in one of few neighbouring countries.... ;)

Joules:
How are prices for the inserts ?   The bar looks like something that could be shop made.  Interesting idea for internal shaper tooling.

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