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  1. #1
    Join Date
    Jun 2007
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    Victoria, Australia
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    Question Cross-slide dial inaccurate ?

    I use a Hafco cl40a lathe. The cross slide dial is inaccurate and has been so since new as told by the previous owner. The lathe has an accurate DS10 DRO. I can verify by the DRO and my micrometer the lathe is accurate and can consistently be within 0.02mm on the final cut. Sometime better. However, the cross-slide dial is not even close. 1 mm on the cross-slide dial show 1.5mm on the DRO. 2.0mm show 3.0mm on the DRO and 5mm on the cross-slide shows roughly 8mm on the DRO. The DRO is correct. To me it looks like something is mismatched from new.

    Iím thinking either the internal screw of the cross-slide dials are mismatched.


    What do others think?

  2. #2
    Join Date
    Apr 2018
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    Drouin Vic
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    211

    Default

    Yes sounds like the dial is made for a different pitch feedscrew.

  3. #3
    Join Date
    Jun 2007
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    Default

    Checking the parts manual, the cross-feed screw comes in either metric or imperial. I wonder?

  4. #4
    Join Date
    Apr 2012
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    Healesville
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    Default

    If it was an imperial 20 tpi thread 1 full turn would move 1.27 mm

  5. #5
    Join Date
    Sep 2012
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    North Yorkshire UK
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    Default

    Hi John, Guys,

    Quote Originally Posted by shedhappens View Post
    If it was an imperial 20 tpi thread 1 full turn would move 1.27 mm
    How about a metric thread and imperial dial ? Or even a leadscrew and nut from a different lathe.
    Best Regards:
    Baron J.

  6. #6
    Join Date
    Apr 2012
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    Healesville
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    Default

    My macson has 200 thou for 1 turn of the cross slide handle so that would have a 20 tpi thread. The hercus is 100 thou per turn so that would a 10 tpi thread. If you can measure 1 full turn then it should be easy enougj to work out the dial that you need.

  7. #7
    elanjacobs is online now Apprentice gear maker and machine doctor
    Join Date
    Aug 2008
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    Default

    Easy way to check it...just put your DRO in imperial and see what it says for 1 turn

  8. #8
    Join Date
    Nov 2017
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    Geelong, Australia
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    Default

    There was a thread a few months back on 3D printing larger dials. Might be an option if you want to replace yours.

    Steve

  9. #9
    Join Date
    Jun 2007
    Location
    Victoria, Australia
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    Default

    Took some measurements.

    1 full turn or 5mm on the dial measures consistently 7.99mm on the DRO. Close enough to 8.00mm. A factor of about 1.6
    0.19" on the dial measures 0.2984" on the DRO. Which is a factor of 1.57 or close to 1.6.

    The cross feed rod is metric and has a 4mm pitch.

    All looks good so far. Found lots of swarf in and around the feed rod. Not suppose to get in there. I'm thinking something is worn. Broke my classes tonight so I will continue in a few days.
    I will post some pictures later.

    Thanks for the comments.
    Regards,
    Tom

  10. #10
    Join Date
    Apr 2012
    Location
    Healesville
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    Default

    Your dro is set to read diameter, i have tried that in the past and did'nt like it.
    I think it didn't seem to be as accurate as having the dro set to radius.
    Set to radius also makes it easier when cutting to a depth for something like an o ring groove.
    I have a cl410, it has a 4 mm thread and it is a newer model of your cl40, see pic of the crossfeed dial below.
    One full turn is 8 mm on the dial and this moves the cross slide 4 mm. So this also is made to work with the radius of the job.
    Attached Images Attached Images

  11. #11
    Join Date
    Jun 2007
    Location
    Victoria, Australia
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    Default

    Here is my CL40-A cross feed dial. Looks like a full turn is 5.1mm not 5.0 as I wrote.
    Attached Images Attached Images

  12. #12
    Join Date
    Apr 2018
    Location
    Drouin Vic
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    211

    Default

    The dial is made for a 5tpi imperial leadscrew with a secondary metric scale for that pitch which is 5.08mm pitch. If your crossfeed screw is actually 4mm pitch then it will be out by some crazy amount such as the factor you have found. About the same usefulness as having no graduations on the dial at all. I'd be ignoring the dial and using the DRO. You could go to the trouble of making a new dial graduated to the actual pitch of the feed screw, but why worry, since installing a DRO on my mill I don't think I have even glanced at the dials.

  13. #13
    Join Date
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    Default

    Well I disassemble components of the lathe. I have verified the cross feed screw is metric and 4mm pitch. All looks good and no signs of wear. I am sure the dial is a mistake. I will see if the later model will fit.

    Sincerely,
    Tom
    Attached Images Attached Images

  14. #14
    Join Date
    Jun 2007
    Location
    Victoria, Australia
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    Arrow

    I maybe able to buy a replacement dial from H&F.

    I guess if 1 full rotation is exactly 8mm then half a rotation 4mm and so on. Could even go to 64 divisions of 0.125mm
    The Dial diameter is 96.00mm which to suit.


    Wondering if anyone here is willing to make a metric only dial for my lathe? If so PM me.



    Regards,
    Tom

  15. #15
    Join Date
    Feb 2020
    Location
    Melbourne
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    25

    Default 64 Divisions

    Quote Originally Posted by topari View Post
    Could even go to 64 divisions of 0.125mm
    lol
    I can appreciate your dilema, but come on. You don't really want to go Metric do you?

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