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  1. #1
    Join Date
    May 2018
    Location
    Cairns, Qld.
    Posts
    70

    Default Vertex Rotary Table - Inaccurate index

    If you set say 0 degrees at the side index mark on your new Vertex rotary table when using it with the table vertical, like this...


    HV6-5-30%.jpg

    Wouldn't you be a little surprised to see the reading below (267 degrees) on the extended vertical centre-line at the top, i.e. 93 degrees different instead of the expected 90 degrees?


    HV6-3-30%.jpg
    Note; I have scribed the lines across the data plate to show the extended vertical centre-line that passes back down across the large flat base base of the unit as an easy second reference when using the r/t in this way. Also confirmed with a dial gauge sweeping the edge of the table.

    The posed picture below shows that I took these lines north/south & east/west through the centre of the base & 'round the corner' so to speak to the right...

    HV6-8-30%.jpg

    To find that the index plate was about 3 degrees misaligned as below (no surprise).

    HV6-2-30%.jpg

    Easy fix - move the plate up.. But no, there is insufficient room because the main body casting gets in the way directly above & filing out the slots in the plate would leave little metal for the lower screw to grip on. Re-drill & tap new screw holes about 4mm higher? Same problem due the casting.

    Solution; Make a new asymmetric index plate as below.

    HV6-1-30%.jpg

    Which gives the desired 270 result up top...

    HV6-7-30%.jpg

    My question is; has any one else on this forum seen this issue?

    It is not a problem if you are just using the table in one plane, but if you mix & match horizontal & vertical use plus index lines as I did at that time (Not good practice perhaps?) on a part & then notice later that surfaces or drillings are not at true right angles, it could be a bother. Or worse! Bad language or spanner chucking...
    Anyway, it was fixed a good while ago & no problems since.
    Last edited by Halifax614; 25th Sep 2022 at 06:33 PM. Reason: damned smilies

  2. #2
    Join Date
    Mar 2014
    Location
    South of Adelaide
    Posts
    1,225

    Default

    Its not really an issue as you should only use one fixed mark for indexing. Don't think the indexing marks on any of the rotary tables i have used line up horizontally or vertically.

  3. #3
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    It may not be a big problem if you know about it, but this flaw is in the "not nice" category I think.

  4. #4
    Join Date
    Aug 2019
    Location
    Revesby - Sydney Australia
    Age
    56
    Posts
    1,185

    Default

    I'm wondering if the mark up the top is just a scratch+dent in the label?

  5. #5
    Join Date
    May 2018
    Location
    Cairns, Qld.
    Posts
    70

    Default Rotary Table

    Thanks for the feedback gentlemen. I thought at the time that just a little bit of extra effort by the manufacturer would have prevented the 'mismatch' occurring.
    As mentioned, I scribed the line & put the centre punch mark on the data plate as a second reference when using the R/T in that upright position.
    (I should add that I am very impressed with the ability of the cameras in a modern phone to focus sharply & produce such good results all round).

  6. #6
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    Why not just use the same reference mark in both plains?

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