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It's the little things that catch you !

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awemawson:
There should be a shim to give more support to the insert, but I think (may be wrong) that the helix angle is inbuilt to the insert

lordedmond:
 I to may be wrong about the actual reason for the shim I only know mine have them


Stuart

just fired up the google fu and found this ( were my threading tools came from

http://www.greenwood-tools.co.uk/ishop/728/shopscr111.html

edited for more info

awemawson:
It's an interesting point Stuart that I've previously not looked into. This is what Sandvik have to say:

http://www.sandvik.coromant.com/en-gb/knowledge/threading/thread_turning/insert_clearance_angles/pages/default.aspx

But oddly tool dealers like shop-apt.co.uk where I get my inserts only stock one shim for the whole range

http://www.shop-apt.co.uk/shims-seats/tne16-shim-seat-for-apt-ser-16er-threading-tool.html

lordedmond:
sandvik tells the same as greenwood but call it flank clearance

as usual its a mine field and it depend where you look for the info i would believe the chip manufacture rather than the dealers

may people with more knowledge than me will chip in

Stuart
 

vtsteam:
I've got less knowledge for sure, and not a dealer, but this kind of came up for me last threading I did -- not with an insert, but a ground HSS tool.

Technically, the clearance angle is variable depending on the pitch and diameter -- the helix angle -- if you want an ideal clearance. But you can also grind in what is an excessive clearance angle, as long as what's left is strong enough to handle the forces and material. Then the tool can be used for a wider range including lesser pitches or wider diameters. It will wear faster however. So maybe that's what the more "universal" inserts do as opposed to those that use wedges, or have a specified low range of helix angle.

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