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This might be helpful to those just getting into using carbide inserts.
- Thread starter ltlvt
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That is a useful chart.
In fact, there are several charts out there, some with more information, others with less.
Another reference is the book "Introduction to Indexible Tooling for the Metal Lathe" by David.P.Best ISBN 9798753874993
In the time I have had the book, I have actually only referenced it twice as regards insert type so, truth be told, I would just as soon have printed off some of the available online charts, laminated them and saved my money by not buying the book and instead spent it on inserts.
In fact, I find the info in the "Engineers black book" on inserts more useful. Those 25 pages (in the pocket sized book) are more useful to me than the Book by David Best!
In fact, there are several charts out there, some with more information, others with less.
Another reference is the book "Introduction to Indexible Tooling for the Metal Lathe" by David.P.Best ISBN 9798753874993
In the time I have had the book, I have actually only referenced it twice as regards insert type so, truth be told, I would just as soon have printed off some of the available online charts, laminated them and saved my money by not buying the book and instead spent it on inserts.
In fact, I find the info in the "Engineers black book" on inserts more useful. Those 25 pages (in the pocket sized book) are more useful to me than the Book by David Best!
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What is a wiper insert?
Sandvik Coromant () explained: The wiper technology for turning is based on a carefully developed series of radii that make up the cutting edge. On a conventional insert, the ...
GsT
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I've had this link for a while and emailed it to myself to my yahoo address and put it in my Shop file notes on Yahoo mail. this way I can reference the entire chart while in my shop. (I have wifi in my shop) I still get confused when trying to use the chart in this link. what does this mean"
Size (e.g. "CNMG432" / "CCMT32.51")
ANSI Code No. | Inscribed Circle Size | ISO Code No. (metric cutting edge length) by shape code letter of insert | |||||||
decimal in. | fractional in. | C | D | R | S | T | V | W | |
0.5 | .0625" | 1/16 | | | | | | | |
1.2 (5) | .15625" | 5/32 | S4 | 04 (4mm) | 03 (3mm) | 03 (3mm) | 06 (6mm) | | |
1.5 (6) | .1875" | 3/16 | 04 (4mm) | 05 (5mm) | 04 (4mm) | 04 (4mm) | 08 (8mm) | 08 (8mm) | S3 |
1.8 (7) | .21875" | 7/32 | 05 (5mm) | 06 (6mm) | 05 (5mm) | 05 (5mm) | 09 (9mm) | 09 (9mm) | 03 (3mm) |
2 | .25" | 1/4 | 06 (6mm) | 07 (7mm) | 06 (6mm) | 06 (6mm) | 11 (11mm) | 11 (11mm) | 04 (4mm) |
2.5 | .3125" | 5/16 | 08 (8mm) | 9mm | 07 (7mm) | 07 (7mm) | 13 (13mm) | 13 (13mm) | 05 (5mm) |
3 | .375" | 3/8 | 09 (9mm) | 11 (11mm) | 09 (9mm) | 09 (9mm) | 16 (16mm) | 16 (16mm) | 06 (6mm) |
3.5 | .4375" | 7/16 | 11mm | 13mm | 11 (11mm) | 11 (11mm) | 19 (19mm) | 19mm | 7mm |
4 | .5" | 1/2 | 12 (12mm) | 15 (15mm) | 12 (12mm) | 12 (12mm) | 22 (22mm) | 22 (22mm) | 08 (8mm) |
4.5 | .5625" | 9/16 | 14mm | 17mm | 14 (14mm) | 14 (14mm) | 24mm | 24mm | 9mm |
5 | .625" | 5/8 | 16 (16mm) | 19 (9mm) | 15 (15mm) | 15 (15mm) | 27 (27mm) | 27 (27mm) | 10 (10mm) |
5.5 | .6875" | 11/16 | 17mm | 21mm | 17 (17mm) | 17 (17mm) | 30mm | 30mm | 11mm |
6 | .75" | 3/4 | 19 (19mm) | 23 (23mm) | 19 (19mm) | 19 (19mm) | 33 (33mm) | 33 (33mm) | 13 (13mm) |
6.5 | .8125" | 13/16 | | | | | | | |
7 | .875" | 7/8 | 22 (22mm) | 27 (27mm) | 22 (22mm) | 22 (22mm) | 38 (38mm) | 38 (38mm) | 15 (15mm) |
8 | 1" | 1 | 25 (25mm) | 31 (31mm) | 25 (25mm) | 25 (25mm) | 44 (44mm) | 44 (44mm) | 17 (17mm) |
10 | 1.25" | 1-1/4 | 32 (32mm) | 38mm | 31 (31mm) | 31 (31mm) | 54 (54mm) | 54 (54mm) | 21 (21mm) |
| 1.26" |
Which part is unclear? There are several ways of specifying the size of an insert, the two common ones are cutting edge length (blech!) and inscribed circle (IC). I favor IC because it's easy to understand, and pretty easy to eyeball the difference if you stay away from the weirdo sizes. For instance, most of my inserts are either 3/8" or 1/2" IC - regardless of shape. IC is the biggest circle that can fit within the outline of the insert. So it's pretty easy to tell the difference between those two. In the examples given (CNMG432" / "CCMT32.51) the first has a "4" and would be a 1/2" IC, the second is a "3" and would have a 3/8" IC. Does that make sense?
The ISO code is the cutting edge length, so even for an insert with the same IC, the ISO designation can be different, depending on the shape. I consider it tedious and must refer to a chart like that above if forced to do so.
GsT
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So what you are essentially saying is that the example nomenclature is based upon a base of multiples of 1/8"?
Yes, for all the ANSI (IC) designations, not just the example. The ISO spec is edge length in mm.
GsT
