Newbie Forum

Discussion in 'Newbie' started by KurtB, Apr 16, 2009.

  1. vince krynski

    vince krynski

    Joined:
    Dec 8, 2011
    Messages:
    2
    Location:
    Victoria Canada
    Spindle turning measurement

    Hello everyone
    I am looking for some advice on what to safely use for measuring spindle diameters while the lathe is spinning. I envision something that I can preset to a diameter and that would be a go-no go type of measurement.
    If there is something commercially available and commonly used I would appreciate hearing about it
    Thanks
    Vince
     
  2. john lucas

    john lucas

    Joined:
    Apr 26, 2004
    Messages:
    5,820
    Location:
    Cookeville TN USA
    There is something commercially available. http://www.petergalbertchairmaker.com/galbertcaliper.html It isn't cheap. I use 3 methods. I have outside calipers that I bought from Grizzly. Round over the inside edges so they aren't sharp and then you set them to the diameter you want and use a parting tool to cut until the calipers drop over. Typically parting tools don't leave a very clean cut so I always leave the dimension just a little thick so I can make one more pass with a good cutting tool. For smaller diameters I use my dial calipers. I set the dimension and then use the same technique with the outside calipers. With practice you can get very accurate dimensions. The final method requires finding a wrench that is the size you want but thin enough so you can fit it into the parting tool kerf. I use a 3/8" one for my mirror handle tenons. I just cut with the parting tool until the wrench drops over and it's the right size. Some people have recommended sharpening one jaw of the wrench and using that as your parting tool as well as a sizing tool. I tried it and it works but if your not really careful you can easily go under size.
     
  3. vince krynski

    vince krynski

    Joined:
    Dec 8, 2011
    Messages:
    2
    Location:
    Victoria Canada
    Spinning measurement

    Thanks John
    I will check out the " Galbert" solution
    Vince
     
  4. hockenbery

    hockenbery AAW Advisor Staff Member

    Joined:
    Apr 27, 2004
    Messages:
    4,304
    Location:
    Lakeland, Florida
    Home Page:
    I use the simple outside calipers for most of my sizing. ( for Christmas ornament finials I do use the wrenches) Groz from woodcraft are good But even really cheap ones from HF will work well Just don't push hard enough for them to spring open as this will give you a slightly larger measure ( usually not a problem unless it is for fitting a tenon.
    The corners on all calipers need to be rounded over. I just roll them lightly on a grinding wheel. If I can ever feel a point on my finger I remove it.
    A point will catch in the wood and will throw the calipers at you.

    In most spindles like table legs or ballastrads the vertical elements need to match with a 1/32 or so. The diameter measures can be off a lot sometimes 3/16 and not be noticeable.

    This is a short video clip from a long demo that shows turning a spindle.
    I use calipers to make several diameter makes then connect them to make a cylinder. It shows using th calipers and a one handed use of the parting tools.

    http://www.youtube.com/watch?v=I05IYkb06Jc

    Notice that I hold the calipers so that they can be pulled from my hand without breaking a finger. This never happens to me but if you aren't paying attention you can bind the calipers in a deep parting by not keeping them vertical. I use a bowl gouge for this because i use it later in the demo.

    Al
     
    Last edited: Dec 30, 2015

Share This Page