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New to tool offsets on manual lathe

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by SmokeWalker, May 18, 2017.

  1. SmokeWalker

    SmokeWalker United States Active Member Active Member

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    Hey,

    After barely figuring out how to program my Newall DP 700 for tool offsets, I'm a little unclear on a few things:

    How often do you re-enter then values? I can take a cut, and then "teach" the unit what that value truly is. That's fine, but in my limited experimentations last night, my accuracy was kind of hit-or-miss.

    Also, is it possible to label each tool in the machine with recommended feed rates to secure repeatable cuts?

    Lathe: Hardinge HLV-H.
    Tools:
    • solid carbide boring bar (extra long)
    • solid carbide turning tool
    • Internal threading tool
    Having those three available would really save me some time.

    The only tool I've tested is the boring bar.

    Methodology: I used the DRO to set the tool location for roughing passes, and then, when I'm a few thousandths away, use the [written down] feed rate to do the final pass at the final dimension.

    Any assistance?
     
    Billh51 likes this.
  2. umahunter

    umahunter United States Active User Active Member

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    If you have Facebook you might have a lil more luck on the machinists page lots of knowledgeable folks in cnc etc it's the biggest group like 30 thousand members be fore warned there's plenty of jack arses as well
     
  3. SmokeWalker

    SmokeWalker United States Active Member Active Member

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    I was afraid of this. Fortunately, I have, as Bear Grylls says "performed 'self-rescue'". Now I have a new problem: What can I use to label the holders?! A permanent ink that shows on black metal would be great..
     
  4. owl

    owl United States Active Member Active Member

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    I like to use the gold and silver pens that they sell at craft stores. They are reasonably permanent, but can be wiped off with alcohol.
     
  5. SmokeWalker

    SmokeWalker United States Active Member Active Member

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    I'm looking at the Sharpie Extra Fine metallic silver markers.
     
  6. terrywerm

    terrywerm New Member Liaison Staff Member H-M Supporter-Premium

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    I use the silver Sharpies on dark items quite a bit also. Over time it may start to wear off, but it's no big deal to remark the item as needed. I tried white paint pens in the past too, but they are too messy by nature, and paint will flake off over time also.
     
  7. Wreck™Wreck

    Wreck™Wreck United States Active User H-M Supporter-Premium

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    Do not know if this is applicable to your particular machine or DRO so choose wisely.

    Often tool #1 has no offset so all other offsets are relative to tool #1, if the DRO has a work shift function as it should then turn and face a sample with tool 1 and set the work shift at the actual diameter (X) and Z at zero or whatever you decide, make sure that #1 has 0.000 offset.

    Switch to tool 2 and touch off or turn the sample and enter this in the offset table at the measured dimensions and it will record the offset for that tool from #1, do this for every tool used. This will generate a tool offset table for each tool.
    Each tool will then be offset by a fixed amount, if you change tools in the holder or even inserts you will have to adjust the offset for that tool.

    Simple really as all tools regardless of length and size are offset relative to one tool, keeping a single tool as a reference is an excellent practice, when you need to change it use the workshift function and the offsets remain.

    Good Luck
     

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