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  1. #1
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
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    6,458

    Default Using Eccentric Engineering's Turnado Tracing Attachment

    I have rekindled my interest in the little Hercus No.O mill that I've owned for probably fifteen years and with that interest has come a desire to make some "improvements".

    The Y axis feed handwheel features a piddly little tear drop handle, the same handwheel and handle are fitted to the 9" and 260 lathes tailstocks where they move a spindle whereas the O's moves a cast iron table. I'm my mind the handle is too small. Hercus fitted a larger handwheel and handle on the mill table's X axis so I thought I would see if there would be an improvement if a larger handle was fitted. There was ...

    IMG_20190717_113007313.jpg

    Several years ago I received from Hercus several ball handles along with their little tear drops so I thought I could simply press in one of the larger tear drops in place of the tiddler.

    IMG_20190717_113447621.jpg

    Then I realised the shape of the handle was different so I decided it was time to put the Turnado to use. I drew what I thought was a pretty close copy of the original handle on some aluminium and made a half template. Turns out my drawing skills are a touch lacking. The handle looks like it is for the 13, not the Hercus. Another error was not rough turning the 1214 blank to its approximate finished shape. Next time....

    IMG_20190718_133048726 (1).jpg IMG_20190718_134245585.jpg IMG_20190718_145949322.jpg IMG_20190718_150917417.jpg

    The red painted handwheel was salvaged from a Hercus No.3 tool and cutter and it is the same size as that fitted to the mill's X axis.

    BT

  2. #2
    Join Date
    Dec 2013
    Age
    56
    Posts
    1,416

    Default

    Came out great Bob, I had a go at free handing a small knob the other day, it came out OK but not exactly what I wanted.
    I'll be looking into making a ball Turner and am very interested in a setup like yours.
    Using Tapatalk

  3. #3
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Very nice Bob,

    How about one of these (or similar) for matching and marking out your profiles.

    https://www.ebay.com.au/itm/10-Shape...8AAOSw6TtdJa6A

    cheers, shed

    this looks better than the placka one https://www.ebay.com.au/itm/CONTOUR-...oAAOSw32lY2GL7

  4. #4
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

    Default

    Quote Originally Posted by shedhappens View Post
    Very nice Bob,

    How about one of these (or similar) for matching and marking out your profiles.

    https://www.ebay.com.au/itm/10-Shape...8AAOSw6TtdJa6A

    cheers, shed

    this looks better than the placka one https://www.ebay.com.au/itm/CONTOUR-...oAAOSw32lY2GL7
    Thanks J,

    I just hit the button for something similar while you would have been typing - https://www.ebay.com.au/itm/6-Profil...sAAOSwnaJdJt64

    Bob.

  5. #5
    Join Date
    Dec 2013
    Age
    56
    Posts
    1,416

    Default

    Quote Originally Posted by shedhappens View Post
    Very nice Bob,

    How about one of these (or similar) for matching and marking out your profiles.

    https://www.ebay.com.au/itm/10-Shape...8AAOSw6TtdJa6A

    cheers, shed

    this looks better than the placka one https://www.ebay.com.au/itm/CONTOUR-...oAAOSw32lY2GL7
    I've had that second link one for probably 25 years, bought for me as a present from my daughter when I used to do wood working a lot.
    It sits in my machining draws well oiled in a clip lock bag as it's not stainless, has been handy over the years for both wood and metal etc, never thought of using it for these handles thanks for the idea.
    Using Tapatalk

  6. #6
    Join Date
    Dec 2013
    Age
    56
    Posts
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    Default

    Quote Originally Posted by Anorak Bob View Post
    Thanks J,

    I just hit the button for something similar while you would have been typing - https://www.ebay.com.au/itm/6-Profil...sAAOSwnaJdJt64

    Bob.
    That looks exactly like the one I have
    Using Tapatalk

  7. #7
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
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    Default

    I thought I would have another go while waiting for the profile gauge to arrive. I revised the template profile and rough turned the blank. While the shape isn't a dead ringer for the original, it'll do.

    IMG_20190721_143809066.jpg IMG_20190725_153748696.jpg IMG_20190723_160325272.jpg

    And here's the original X axis handwheel.

    IMG_20190723_160409808.jpg

    In my mind the larger handle transforms for the better the feel of the cross slide handwheel.

    The Turnado utilises a stepped pivot pin to locate the toolpost and the left hand end of the tracing attachment's fence. It is small and as I found out, readily sucked up into a vacuum cleaner nozzle. So to avoid permanent loss I made a couple of stay put pivot pins. Tightening the fence's right hand clamp causes the fence to lift up slightly so the new fence pivot is in the form of a clamp. The toolpost pivot is simply a turned down M5 stainless steel cap screw.

    IMG_20190725_151705317.jpg IMG_20190725_151624682.jpg IMG_20190725_151542268.jpg IMG_20190725_151750194.jpg IMG_20190725_152148008.jpg IMG_20190725_152859157.jpg IMG_20190725_151958508.jpg

    BT

  8. #8
    Join Date
    Aug 2013
    Location
    Melbourne
    Posts
    229

    Default Freehand turning

    For some good freehand turning l would like to recommend "Max Grant, the Swan Valley machine shop" on YouTube. I don't have specific episodes for the freehand turning however there are a few in his library, his other videos are pretty good too.
    Cheers
    Pete

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