5,000 eh!? It sounds like I’m leaving money, parts, and time on the table....I’ll have to investigate this further. Thank you!
Just to be sure - I check my tool center height by 1) facing off less material than the width of the insert and check for a tit and/or 2) check the front of the bar and the back of the part after cutoff in production for a tit. Is that about right? One or twice I have pinched a 6” rule between the insert and the stock to see if it’s tilted and that worked surprisingly well.
Thanks, again!
I am not sure how to bring one on center on a swiss machine. I have mine on cross slides or a vertical slide. I can bring them in by hand and line it up with the face of the part by eye. Making sure it is below center a little bit so it will leave a small tit when I cut it off by hand.
I then have set screws with an egg shaped cam on my toolholder that I can turn to rise or lower the cutoff tool. Make minor adjustments until I get what I like.
I just ran 4000 .312" round 316 SS parts with 1 tool. It was still cutting good so I left it in on the next job. 5000 parts of .125" round 316 SS. It could use a sharpen now but it usually gets 2500-3500 parts on these jobs. I got over 7500 this time around with it.
Some of my long running 1215, 12L14 jobs that run all week long can get between 1-2 days per sharpening all the way to 5-6 days. Sometimes we run those jobs Monday - Saturday 7 hours a day and the cutoff/form tools last quite a while.
Just a little bit above center will cause faster tool failure than slightly under center.
I also ran 2500 parts in 440C SS and I used 1 cutoff the whole time and didnt re sharpen yet. It still looks good.
I have some material here that is 4140, 41XX (equivalent, JIS), and 440C SS. These are all in the mid 20's rockwell I believe. They cut nice and hold tolerance just fine with my HSS Tooling and slower speeds. They can be tough materials but if I let the tools cut and don't put too much pressure on things it seems to machine pretty decently. I would consider it free machining grade for the jobs I do. I can walk away from them for hours at a time.
I have seen some things on ebay that you can chuck up in the collet and use it to level your tools and get them on center. Don't know if that would work in the swiss world though.
Good Luck. 41L40 should be easy to machine. I haven't seen it in a while but its even easier than the 4140 I have been machining.