Carbide Turning Inserts

[kyler]

How do you read the number? If the mfg recommends TCMT 16T304, what does the TCMT and 16T304 mean?

 

[Galileu]

How do you read the number? If the mfg recommends TCMT 16T304, what does the TCMT and 16T304 mean?

I think you ought to read this: http://www.hobby-machinist.com/content.php?159-Carbide-insert-tooling-in-HSM-situations

Best regards,
José

 

[kyler]

thanks!

 

[kyler]

That's the ISO version of designation for a (in NASI spec) TCMT32.51 insert.

T - Triangular shape
C - 7º side clearance angle
M - tolerance range on I.C. size, tip distance & thickness, you want the values in inch or mm?
T - single-sided screw down, chibreaker edge, hole 40-60º double angle countersink
16 - long edge length of triangle shape, 16mm
T3 - 4mm thick, or 2-1/2 "sixteenths" of an inch. No idea why the T or the 3 is used in the ISO designation, but is used primarily on screw-down inserts
04 - tool nose radius, 0.4mm or about .0156"

perfect - I've been getting headaches trying to understand this - thanks!