High speed parting blades--why? - Page 3
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  1. #41
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    Quote Originally Posted by ChipSplitter View Post
    Did you ever watch a CNC lathe part off at .01 ipr and 800 SFM? It's all over before you realize what happened. 1" dia. part is about a second and a half.
    You have to turn off CSS when you get close to the center......
    Yeah, that is pretty fast, and I do run inserts in my CNC lathes, just never as fast as your example. On the really dumb single spindle screw machine I have had 7 tools in the cut at one time, that is kind of hard to do on a CNC.

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    Quote Originally Posted by TeachMePlease View Post
    Meh, that's for kids.

    I've got a lathe that I can part off stock with a laser.
    Uhm...no...it's for Ox.

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    Quote Originally Posted by FredC View Post
    Yeah, that is pretty fast, and I do run inserts in my CNC lathes, just never as fast as your example. On the really dumb single spindle screw machine I have had 7 tools in the cut at one time, that is kind of hard to do on a CNC.
    I can get close.

    YouTube

    Side note: if you watch the whole video, the sample part is a muzzle brake. I have one on my desk at work, in stainless. Neat stuff

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  7. #44
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    Quote Originally Posted by ChipSplitter View Post
    Did you ever watch a CNC lathe part off at .01 ipr and 800 SFM? It's all over before you realize what happened. 1" dia. part is about a second and a half.
    You have to turn off CSS when you get close to the center......
    Doesn't that damage the part flying off like a bullet ?

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    Quote Originally Posted by digger doug View Post
    Doesn't that damage the part flying off like a bullet ?
    Not if you have a sub spindle.

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    Quote Originally Posted by digger doug View Post
    Doesn't that damage the part flying off like a bullet ?
    Actually, you would be surprised how controlled it is. By the time it gets to the center it just bulldozes it off.
    Obviously you have to limit the speed to about 2000 RPM before X0.

    I don't understand the "pinching" theory that claims carbide doesn't work.

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    Quote Originally Posted by ChipSplitter View Post
    Actually, you would be surprised how controlled it is. By the time it gets to the center it just bulldozes it off.
    Obviously you have to limit the speed to about 2000 RPM before X0.

    I don't understand the "pinching" theory that claims carbide doesn't work.
    I believe it's all about longer, heavier parts that "bend down" when parting off. Visualize parting off 2" dia. barstock, 8" long.

    Your cut off tool is just like any other tool in the turret ?
    On the automatics, the tool cut off is usually a separate dedicated slide, and near TDC.

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  12. #48
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    Quote Originally Posted by digger doug View Post
    Your new here, read the archives, the HSS/Carbide/Ceramic debate has several
    threads over the years.
    .
    yeah, was a big thing in the late '80's

    How do you guys feel about rocker tool posts?

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    Quote Originally Posted by digger doug View Post
    I believe it's all about longer, heavier parts that "bend down" when parting off. Visualize parting off 2" dia. barstock, 8" long.
    Yes.
    Most of the parting we do is less than 2xD. I wouldn't want to be anywhere close to someone doing a 2" x 8" part. Talk about rearranging your teeth...

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    Quote Originally Posted by digger doug View Post
    Doesn't that damage the part flying off like a bullet ?
    Without a subspindle, but still on a CNC: slow down to maybe 800-1000 RPM at a diameter where the part doesn't wobble (IIRC used .200 for parts under 2.0" OD), then complete the cut at that low RPM. NB: It's been a while so the numbers may not be exactly correct, but the concept is sound.

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    Quote Originally Posted by ChipSplitter View Post
    Yes.
    Most of the parting we do is less than 2xD. I wouldn't want to be anywhere close to someone doing a 2" x 8" part. Talk about rearranging your teeth...
    And I think that's where the "pinched carbide" comments are stemming from.
    Also, if you don't have pick off.

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    A lot of it is horses for courses, ……...I very seldom use carbide insert system tooling with my plastic work - unless it's very abrasive there's no need for carbide, HSS is a lot easier to grind for specials (which a lot of my stuff is) and most carbide parting systems take up too much room on a 10'' SB clone lathe - which is more than big enough for the job.

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    Quote Originally Posted by digger doug View Post
    Your really coming off as a carbide salesman with this line.

    Your new here, read the archives, the HSS/Carbide/Ceramic debate has several
    threads over the years.

    Brand new HSS cut off blades are still being made & sold every day, there is a market
    for it.
    Looks like you have Bluechips confused with Chipsplitter. Bluechips has been here since 2009.

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    Quote Originally Posted by Big B View Post
    Looks like you have Bluechips confused with Chipsplitter. Bluechips has been here since 2009.
    No. you misread yet again.
    I said "you look like" not "you are" please try and comprehend.

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    Quote Originally Posted by Mcgyver View Post
    How do you guys feel about rocker tool posts?
    Whoa gnarley........Like Dude, a tool post with built in stereo speakers?? Wow COOL.


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    A gooseneck parting tool. I have one, and the lantern to hold it.

    This is where I got the idea for running upside down and backwards. Night and day.

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    Quote Originally Posted by Big B View Post
    Looks like you have Bluechips confused with Chipsplitter. Bluechips has been here since 2009.
    I can play a spammer role.

    In fact, I could put all those wannabes to shame.........

    Whooooooosh.....

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    Quote Originally Posted by Big B View Post
    Looks like you have Bluechips confused with Chipsplitter. Bluechips has been here since 2009.
    Just in case someone thinks my screen name 'Bluechipx' has anything to do with poker/gambling type chips, no. it came from my high school machine shop teacher, he said "if you ever see a blue chip, stop immediately you are running or feeding too fast". Tells you how old I am! Nowadays if you don't see a blue chip you must be doing something wrong.

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    If we're on the subject of revolutionary inventions in machining, here is my list from best to least significant:

    1) Carbide
    2) Coolant fed drills
    3) Variable index endmills (BIG deal, there)
    4) ISO standard turning inserts
    5) Graduating from APKT milling inserts
    6) OSG Mega Muscle drills
    7) Rigid tapping

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    I was parting off some aluminum yesterday and it went well. I tried this morning on mild steel and it was hard and slow. I took the HSS tool out and hit it on the grinder. Works great again.
    Bill D

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