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Old 03-13-2006, 08:59 PM
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Default indexable tooling

what do these terms mean ?

TCMM, TCMT, TPMT, C6, C2, etc.
Inscribed Circle (Inch): 3/8

i kinda know what these mean, kinda. AR, AL, BR, BL, E

thanxx
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Old 03-13-2006, 09:29 PM
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Quote:
Originally Posted by Blown 4.3
TCMM, TCMT, TPMT
Describes the general shape of the carbide insert
First letter is the shape T's are triangles, C 80 degree diamond, S is square, R is round, etc.

the second letter is relief on the insert, N is negative of 0 degree, C IIRC is 7 degrees and P is 11 degrees.

The 3rd is the tolerance of the insert.

the fourth is the configuration for holding the insert, pin only, top clamp, etc.

CNMG 432 PM 4015,

432 the '4' is the inscribed circle in 1/8" or in this case 1/2", the 3 is the thickness of the insert in 1/16" of an inch or 3/16" and the 2 is the nose radius in 1/64" or 2/64" or 1/32", the PM is the chip breaker and these are proprietary code and style unique to the insert maker as well as the carbide grade 4015, although recently the ISO code has been included in the grading system by most insert makes. My example is for a common Sandvik insert, 4015 is an ISO 15, the lower the number the harder and more brittle the grade the higher the tougher the grade. ISO 15 ~ C8 ISO 35 ~ C2.

Quote:
Originally Posted by Blown 4.3
C6, C2,
Old American carbide grading system, not in serious use anymore.

Quote:
Originally Posted by Blown 4.3
i kinda know what these mean, kinda. AR, AL, BR, BL, E
System of identifying brazed carbide tools, these are not indexable tools.
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Old 03-13-2006, 09:30 PM
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If you can get you hands on a Sandvik or Kennametal catalog their are good explanations of the whole system.
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Old 03-13-2006, 10:55 PM
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ok, so, how does a guy know what insert is for what metal ? or does that matter ?
can the inserts be turned over for another 3 new points ?
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Old 03-13-2006, 10:59 PM
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Quote:
Originally Posted by Blown 4.3
ok, so, how does a guy know what insert is for what metal ? or does that matter?
That is more dependent on the grade (what it is made of) of the insert not the shape of the insert. Sandvik's 1000 series are general purpose, 2000 is stainless, 3000 is cast iron, 4000 is steel, for example.

Quote:
Originally Posted by Blown 4.3
can the inserts be turned over for another 3 new points ?
Depends some can some cannot. All the ones you listed in your first post cannot. They are one sided so you only get the 3 corners. A TNMG insert would give you six corners.
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Old 03-13-2006, 11:00 PM
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Quote:
Originally Posted by Shade Tree Welder

AR, AL, BR, BL, E

System of identifying brazed carbide tools, these are not indexable tools.
i thought these were the angles that the insert is placed on the holder ?

i am now using the brazed style. they work ok enough, but are getting chipped.
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Old 03-13-2006, 11:04 PM
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Quote:
Originally Posted by Blown 4.3
i thought these were the angles that the insert is placed on the holder ?

i am now using the brazed style. they work ok enough, but are getting chipped.
"A" and "B" are the angle and shape, I don't recall what the actually what they are as I do not use brazed carbide. R and L are right and left and I think the E in neutral.

If they are chipping they grade of carbide is too hard for what you are doing or you SFPM too slow. Try a tougher grade of carbide C2 or C3.
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Old 03-13-2006, 11:16 PM
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yeah. sometimes i do feed it slow, to get a smoother finish. but the bits are el-cheapos, so i wouldn't expect them to last long.
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Old 03-13-2006, 11:21 PM
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Quote:
Originally Posted by Blown 4.3
yeah. sometimes i do feed it slow, to get a smoother finish. but the bits are el-cheapos, so i wouldn't expect them to last long.
I was refering to speed (rpm) not feed. Slow feed will not chip the carbide, too slow a speed will.

Example brazed carbide tooling, I would run at 200 sfpm. if you part was 2" in dia. You would want.

382 RPM = (200 ft/min * 12 in/ft)/(2 in * PI(3.1415))
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Old 03-13-2006, 11:33 PM
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Sandvik

Kennametal

Iscar

Seco/Carboloy
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Last edited by Shade Tree Welder; 03-13-2006 at 11:43 PM.
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