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  1. #1
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    Set up and run - Steel parts

    Hi Folks.

    I thought a thread on machining larger steel parts would be useful.

    Please share your thoughts and information here.

    I'll start the ball rolling with part one of this video series:

    Cliff

    https://www.youtube.com/watch?v=Pz_12ETmgbQ&t=4s

  2. #2
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    Re: Set up and run - Steel parts

    Touching a drill at the tip on a cnc lathe is great if you do not drill too deep, otherwise, it's better to indicate the center on the holder because if you drill much deeper, you'll get a lot of rubbing on the side of the drill if you are like 0.010 off-center.

    Nice video.

  3. #3
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    Re: Set up and run - Steel parts

    Quote Originally Posted by jeffrey001 View Post
    Touching a drill at the tip on a cnc lathe is great if you do not drill too deep, otherwise, it's better to indicate the center on the holder because if you drill much deeper, you'll get a lot of rubbing on the side of the drill if you are like 0.010 off-center.

    Nice video.
    I agree - If you are doing critical deep hole work, eg reaming, you actually need to dial in the tool in line with the Z travel in both directions. Having it correct at either end but on an angle will give issues on precision or deep work. Cheers Cliff

  4. #4
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    Re: Set up and run - Steel parts

    Your videos are nice. I always pick up a trick or learn something in general.
    Do you use conversational programming for most your lathe work?

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    Re: Set up and run - Steel parts

    Quote Originally Posted by mountaindew View Post
    Your videos are nice. I always pick up a trick or learn something in general.
    Do you use conversational programming for most your lathe work?
    Thanks MD. Yes I use conversational for my lathe work and Bobcadcam for mill. Cliff

  6. #6
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    Re: Set up and run - Steel parts

    Hi Folks

    Here is part 2. Cheers Cliff

    https://www.youtube.com/watch?v=Imd3repqhsk&t=1s

  7. #7
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    Re: Set up and run - Steel parts

    Hi again Folks. And here is part 3. Finding the limit in steel.

    https://www.youtube.com/watch?v=OxRBgyxbchI&t=3s

  8. #8
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    Re: Set up and run - Steel parts

    Cliff, thanks for the series of Slant Pro videos. Do you think positive rake holder/inserts such as CCMT would help at all the larger size part?

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    Re: Set up and run - Steel parts

    Quote Originally Posted by maker of things View Post
    Cliff, thanks for the series of Slant Pro videos. Do you think positive rake holder/inserts such as CCMT would help at all the larger size part?
    Hi - The WNMG style I use here is a positive rake insert - but I agree it is not high rake and does take a bit more torque to push that a even higher raked positive insert.

    The trouble with going higher rake is the tool is weaker and not so good at rapid stock removal in steel. With a sticky CQ MS high rake tools are more likely to break. Also the 80 deg of the WNMG allows facing and turning with the same tool.

    But with a weaker tool with more positive rake, a pronounced chip breaker and lighter cuts, larger diameters can probably be acheived - it will just take more time, and might need more watching.

    Cheers Cliff

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    Re: Set up and run - Steel parts

    The other day I was watching a tv show of a guy cnc machining lathe parts for high performance engines. He was having same problem and that machine was huge! Was funny because with all the power and precision the guy just made the bird nest faster. .

  11. #11
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    Re: Set up and run - Steel parts

    Here is a final summary video. With some repeat video clips to give some background, then on to how SlantPro could be improved.

    Cliff

    https://www.youtube.com/watch?v=mxQpUNiM_hk&t=11s

  12. #12
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    Re: Set up and run - Steel parts

    Cliff are you thinking to make a larger pulley for the spindle?

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    Re: Set up and run - Steel parts

    Quote Originally Posted by maker of things View Post
    Cliff are you thinking to make a larger pulley for the spindle?
    I think this developement work should be co-ordinated with changes to the control software and spindle drive system.

    This video is partly to raise awareness off this issue. Yes I have sent this video directly to Tormach.

    Cliff

  14. #14

    Re: Set up and run - Steel parts

    Quote Originally Posted by keen View Post
    I think this developement work should be co-ordinated with changes to the control software and spindle drive system.

    This video is partly to raise awareness off this issue. Yes I have sent this video directly to Tormach.

    Cliff

    Would it not be more of a question of machine rigidity? How much torque can you throw at the machine before things start becoming unstable? Right now the motor is the weak link and stalls with no damage, but what might give if you double the torque?
    Jim Dawson
    Sandy, Oregon, USA

  15. #15
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    Re: Set up and run - Steel parts

    Quote Originally Posted by Jim Dawson View Post
    Would it not be more of a question of machine rigidity? How much torque can you throw at the machine before things start becoming unstable? Right now the motor is the weak link and stalls with no damage, but what might give if you double the torque?
    I cover this in the video Jim

  16. #16
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    Re: Set up and run - Steel parts

    Cliff, if I'm thinking this through correctly, using this chuck would accomplish the same goals as when you modified the jaws? Still would need to bore it out.
    https://www.shars.com/products/workh...s-2-piece-jaws

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    Re: Set up and run - Steel parts

    Quote Originally Posted by maker of things View Post
    Cliff, if I'm thinking this through correctly, using this chuck would accomplish the same goals as when you modified the jaws? Still would need to bore it out.
    https://www.shars.com/products/workh...s-2-piece-jaws
    Hi Jon - Yes it is similiar, well the 5" is the same size, and the jaw tops can be flipped around. But then I ground off the jaw ends that protrude out etc, you would still need to do that to get the streamline shape.
    Or where you thinking of leaving the jaw tops off and shape the underneath portion? I have done that on a 6" and it is very compact, but limited versatility.

    Cheers Cliff

  18. #18
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    Re: Set up and run - Steel parts

    I was thinking that with the reversible jaws, I could hold fairly large stock without sticking out too much. Probably withing the diameter of a 6" chuck. If I have to modify the jaws in the manner you showed, I would probably buy the much cheaper 1 piece jaw chuck.

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