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  1. #1
    Join Date
    Sep 2008
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    Riddells Creek, Vic.
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    831

    Default Waldown Toolpost Grinder - Alternate uses

    I recently purchased a C1 Waldown TPG, from a forum member, with the intention of using it uncoventionally on a Milling machine to true up a worn NT40 internal spindle taper, but I haven't got around to trying that yet. I also have some semi finished grinding wheel adaptors for my old surface grinder that just need the 1.250" locating diameter machined so I figured that the best way would be to grind then mounted on the actual machine spindle to ensure minimum run out on both the diameter and the face.
    The results were much better than I expected.

    TPG1 (2).JPG


    TPG2 (2).JPG


    TPG3 (2).JPG

  2. #2
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
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    71
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    5,942

    Default

    Sorry to tell you this, but your attachments come with the message "Invalid Attachment specified. If you followed a valid link, please notify the administrator"
    Your other pic came out fine, they look really good, and as you say should have minimum runout.
    Kryn
    To grow old is mandatory, growing up is optional.

  3. #3
    Join Date
    Dec 2013
    Age
    56
    Posts
    1,416

    Default

    As Kryn said the first 2 pictu didn't come through, and we all love pictures.
    Looks like they turned out great
    Using Tapatalk

  4. #4
    Join Date
    Apr 2018
    Location
    Drouin Vic
    Posts
    633

    Default

    I can see three pictures. Having just acquired a TPG myself (got to get a drive belt for it yet), I really like this application. How do you plan on working to the taper of the spindle on the mill?

  5. #5
    Join Date
    Sep 2008
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    Riddells Creek, Vic.
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    Default

    There are 2 options for grinding the spindle taper: TPG spindle vertical, with milling head tilted to 1/2 of the angle of the taper and traverse using the knee or TPG spindle horizontal, with milling head tilted 90 degree minus 1/2 of the taper angle and traverse with the x axis of the table. I won't know which method to use until I actually start setting up.

  6. #6
    Join Date
    Sep 2008
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    Riddells Creek, Vic.
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    Default

    Before using the TPG on the Surface Grinder I had to "touch up" the base of the casting to make it parallel with the spindle centre line as it was about .012" out over 4 inches. The photo shows the ground and unground areas after removing about .006".

    Waldown TPG Base.JPG

    Waldown TPG Base 2.JPG



    I also ground a Reference Face for easy set up.

    Waldown TPG Reference Face (2).JPG
    Attached Images Attached Images

  7. #7
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
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    Default

    I have decided to try grinding the milling machine spindle taper on the lathe rather than in head of the mill, hopefully I will have more control and visibility this way. This has been a big job to set up correctly so I hope everything goes smoothly, I only need to remove about .002" to clean up wear and slight runout.

    Beaver Spindle (2).JPG

  8. #8
    Join Date
    Dec 2013
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    I know you have gone to a lot of work, but that would have been more accurate to take the spindle apart and bearings off.

    If you chuck up the top bearing journal accurately in the lathe, then use a steady rest on the bottom bearing journal to do your grinding.

    All bearings have some runout, so doing it the way you are is going to grind your bearing runout into your spindle, and it will move with each rotation as the balls move around.
    Using Tapatalk

  9. #9
    Join Date
    Sep 2008
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    Riddells Creek, Vic.
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    The spindle is fitted with a Duplex pair of precision angular contact bearings, not your average run of the mill general purpose bearings. The method I am using is similar to the way spindle tapers are ground in situ by various companies, mainly in the USA, there are lots of you tube videos showing this process.

  10. #10
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    Fair enough, I thought it was a bench top mill or similar type.
    I have seen over the years of that being done to Bridgeports etc
    Using Tapatalk

  11. #11
    Join Date
    Sep 2008
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    Riddells Creek, Vic.
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    The spindle is driven by an "o" ring which seems to do the job quite well, although I can stop it rotating by hand. Hopefully the small grinding wheel spinning at high speed and light cutting pressure will not make the drive slip.


    o ring drive (2).JPG

  12. #12
    Join Date
    Nov 2008
    Location
    Perth WA
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    71
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    6,458

    Default

    Nice work Lex.

  13. #13
    Join Date
    Sep 2008
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    Riddells Creek, Vic.
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    Default

    The many hours spent getting the Spindle and TPG set up correctly paid off with the actual grinding being all done in about half an hour or less.
    Here's a link to a YT video showing the run out at about .003mm from the original TIR of about .025mm before grinding.

    https://www.youtube.com/watch?v=_1Nuo3_q0Qk

  14. #14
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    Aug 2015
    Location
    Melbourne, Australia
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    Default

    Top job mate. Very well done.

  15. #15
    Join Date
    Sep 2008
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    Riddells Creek, Vic.
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    Default

    Today I decided to try for a better finish on the taper by using a different grade of wheel (38A80---), the results were very good

    Ground Finish (2).jpg

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