On 11/25/2018 1:37 PM, firstname.lastname@example.org wrote:
> On Sunday, November 25, 2018 at 2:16:30 PM UTC-5, Bob La Londe wrote:
>> wrote in message
>> On Sunday, November 25, 2018 at 11:01:21 AM UTC-5, Bob La Londe wrote:
>>> Who uses flood coolant on their manual lathe?
>>> Do you get sprayed when using it? Do you waste a lot of coolant.
>>> I was turning some 304 stainless yesterday on the 1440 and
>>> going fine until it started to get hot. Then it cooked inserts,
>>> If you run flood do you stop using insert tooling?
>>> Until now I've just used a cutting oil on the lathe when the cut
>>> act like it needed it.
>> What kind of inserts did you "cook," Bob? It's AWFULLY hard to "cook" a
>> carbide insert at normal cutting speeds. Were you using HSS inserts?
>> ******** I have a heavy hobby machine. Its a PM1440. Weighs in at
>> 2000lbs with a 3HP spindle motor. Interestingly I was able to machine
>> 4140QT TGP at the same DOC and feeds with little issue with the same
>> inserts. I'm in the process of "hogging" off materials as fast as I
>> I am pushing it as hard as I can.
>> As a side note. I had issues with another modestly difficult
>> the mill this year. I was machining 4140HT and kept killing cutters. I
>> went to an AlTiN coated mill and it got better, but tool life was pretty
>> short. Short enough it was affecting the profitability of the job.
>> flood coolant against all common wisdom, and I was able to increase tool
>> life. It did not shatter from thermal shock as so many said it
>> also tried some uncoated mills and they did die almost instantly.
> When you get into coated cutters, especially like your AlTiN
(Alox-TiN?) multi-coated ones, things can get very weird. Assuming it
*is* Alox on top, the more sophisticated ones generally are made for
high-speed use (up to 3,000 sfm or more), and they have to run dry, or
their life is short. It's the vaporizing Alox that actually serves as
> Most multi-coated inserts are made for a specific application, or a
narrow range of applications. When you use them other than as intended,
it's hard to predict what will happen. That's not to say they won't work
well in other applications, but you have to work out the details for
> So anecdotal information about coolants is going to be a little iffy.
Good luck -- whatever works for you.
It was one of those things I tried in desperation. It seemed to work at
3600 RPM with a 1/2" 6 flute on the Hurco and 1/4" 4 flutes SE and 1/32
2 flute balls noses on the Speedmasters at 16000 to 24000 RPM.
I thought AlTiN was Aluminum Titanium Nitride. I know if I try to use
it on aluminum it chip welds pretty quickly.
Yes, I try things. Sometimes dumb things. I remember when I was trying
to learn about high speed milling aluminum and somebody said basically
what you said. Well in a more complimentary manner. They said, I might
just be THE expert in what I was trying to do. I took that to heart and
just started trying things.
Anyway sometimes dumb things work.
I don't know what I did differently today, but I was able to use
basically all the same tools (well I had to make a trepanning tool) and
finished all the roughing operations on two of the stainless parts I was
making. I didn't burn up a single insert. Except for increasing RPM on
smaller diameters a little more aggressively I didn't do anything