Turning Insert questions

O

outsider347

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I 'd like to buy some spare turning inserts for my Atlas 12" lathe. The lathe came with 1 holder & 1 insert.
I tried to sort thru the pages of offerings in the Enco Catalog, but just not sure what I need

The holder is marked Kennemetal MTDR-62.

Most of what I do is turning cold roll & some hot roll round stock & sole aluminum

Thanks for your help
 
Is this your holder? A 3/8" shank tool?



If so, the generic starting point for your inserts will be like the box behind that example. TNMG-221. The you need to figure out what grade, what nose radius, and what, it any coating you want on it. Kennametal catalog online will have guidelines for those items, generally. For roughing, a larger nose radius is preferable, but may try to chatter in a small machine. For finishing, a smaller radius is generally used, but with a lower feedrate.
 
Tony Tks for the response
The shank is 3/8

I use light cuts & feeds on my atlas. so TNMG-221??
Probably a smaller nose radius
No idea what coating to get..
I'd trust your suggestion
Tks
 
Here's a few links to MSC with a few suggestions for general purpose steel work. http://www1.mscdirect.com/cgi/NNSRI...re=ItemDetail-_-ResultListing-_-SearchResults

http://www1.mscdirect.com/eCommerce...xsj87?refinement=4294932364&searchandizedOk=N

You might want to try eBay also and pick up a 5 or 10 pack for 20-30 bucks.

Here's a chart from this website: http://www.carbideprocessors.com/pages/carbide-parts/tungsten-carbide-grades.html


C grades classification

C-1 to C-4 are general grades for cast iron, non-ferrous and non-metallic materials
C-1 Roughing
C-2 General Purpose
C-3 Finishing
C-4 Precision
Steel and steel alloys - these grades resist pitting and deformation
C-5 Roughing
C-6 General Purpose
C-7 Finishing
C-8 Precision
Wear Surface
C-9 No shock
C-10 Light shock
C-11 Heavy shock
Impact
C-12 Light
C-13 Medium
C-14 heavy
Miscellaneous
C-15 Light cut, hot flash weld removal
C-15A Heavy cut, hot flash weld removal
C-16 Rock bits
C-17 Cold header dies
C-18 Wear at elevated temperatures and/or resistance to chemical reactions
C-19 Radioactive shielding, counter balances and kinetic applications
 
Something like this will get you started:

http://www.carbidedepot.com/detail.aspx?ID=42207

You might do a little better on the bay, but this place usually has good prices. That is a C6 grade 0.016 radius TiCN/Al2O3/TiN coated general purpose insert. It is 1/4" IC, just to make sure the picture I found was accurate and we can trust it for the TNMG-221 spec.
 
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