11-13-2012, 07:29 AM
I thought I'd post a few pics in case anyone is following along at home 
First is the issue I was having in breaking the chips. You can see the blue stringy mess in the gap and draped over the leadscrew. These come of a straw colour and turn blue, as they transfer the heat. I actually took this after I had turned down the 1045 hub and a mystery metal drill coupler (that I had to anneal) is chucked up. I was turning this to be a press fit inside the hub, as I didn't have a lot of length to play with.
Here is the Tungaloy CCMT 9T304-24 T725X (CCMT 32.51 in ANSI) insert.
Here is the Iscar CCMT 9T304-SM IC907 (CCMT 32.51) insert. What is great about this insert, is that the box actually has the feed and DOC data on the box, as well as the Grade (M) and Range (05-20). The Tungaloy inserts don't have this on the box, neither do any of the Walter or Valenite turning inserts. I'd have to check the milling ones I have.
Finally a side-by-side comparison in which you can basically see the difference in the chipbreaker (top form geometry).
One thing I do when buying inserts is that I avoid the cheap non-name ones that have a generic description like "ideal for general machining of steel". I may pay a little more but with a name brand I can be fairly sure that I can find out the what the grade and chipbreaker are most suited to and whether that meets my needs.
If you take your time and do your research you can get some very good deals on inserts from eBay. Especially if the grade has been superseded. But hey, we are not doing production work, so the inserts that were top line last month will still do us fine.
First is the issue I was having in breaking the chips. You can see the blue stringy mess in the gap and draped over the leadscrew. These come of a straw colour and turn blue, as they transfer the heat. I actually took this after I had turned down the 1045 hub and a mystery metal drill coupler (that I had to anneal) is chucked up. I was turning this to be a press fit inside the hub, as I didn't have a lot of length to play with.
Here is the Tungaloy CCMT 9T304-24 T725X (CCMT 32.51 in ANSI) insert.
Here is the Iscar CCMT 9T304-SM IC907 (CCMT 32.51) insert. What is great about this insert, is that the box actually has the feed and DOC data on the box, as well as the Grade (M) and Range (05-20). The Tungaloy inserts don't have this on the box, neither do any of the Walter or Valenite turning inserts. I'd have to check the milling ones I have.
Finally a side-by-side comparison in which you can basically see the difference in the chipbreaker (top form geometry).
One thing I do when buying inserts is that I avoid the cheap non-name ones that have a generic description like "ideal for general machining of steel". I may pay a little more but with a name brand I can be fairly sure that I can find out the what the grade and chipbreaker are most suited to and whether that meets my needs.
If you take your time and do your research you can get some very good deals on inserts from eBay. Especially if the grade has been superseded. But hey, we are not doing production work, so the inserts that were top line last month will still do us fine.
Hunting American dentists since 2015.