1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. We want to wish everyone a healthy, happy New Year, full of joy and success. God bless you, and thank you for supporting The Hobby-Machinist.

    Dismiss Notice

Holding Center w/o DRO using Angles...?

Discussion in 'A BEGINNER'S FORUM (Learn How To Machine Here!)' started by EmilioG, Jan 11, 2017.

  1. EmilioG

    EmilioG United States Active User H-M Supporter-Premium

    Likes Received:
    88
    Trophy Points:
    28
    City:
    HUNTINGTON
    State:
    New York
    I'm planing a new Finger Plate for holding small parts and stock.
    The hard part will be drilling a through hole after the V is machined at a 45° angle.
    The steel plate will then be layed flat after the V cut using an and mill. I need the through hole to
    be dead center of the V channel. Is there a way of re-locating that V's center line after it's moved to
    a flat position w/o a DRO? If the table and vise are locked, will the drill fall on the centerline after the
    part is moved off the 45° angle?
     
  2. chips&more

    chips&more United States Active User Active Member

    Likes Received:
    757
    Trophy Points:
    113
    City:
    Danville
    State:
    California
    The outside edges of the drill bit will catch on the 45° V first. You want the center of the drill bit to locate first.
     
    Charles Spencer likes this.
  3. Tony Wells

    Tony Wells United States Vice President Staff Member Administrator

    Likes Received:
    19,041
    Trophy Points:
    113
    Location:
    Tyler, Texas
    City:
    Tyler
    State:
    Texas
    May need to spot face with an end mill before you attempt to drill. As chips said, the drill will snag on the 45° side before getting to the root of the angle.
     
    Uglydog likes this.
  4. EmilioG

    EmilioG United States Active User H-M Supporter-Premium

    Likes Received:
    88
    Trophy Points:
    28
    City:
    HUNTINGTON
    State:
    New York
    Maybe a center finder/wiggler would work? There has to be a better way to locate the bottom of the V, DRO not withstanding.
    I plan to put a cross hole bushing on the one end of the V, so that hole is critical. Thanks
     
    Uglydog likes this.
  5. Tony Wells

    Tony Wells United States Vice President Staff Member Administrator

    Likes Received:
    19,041
    Trophy Points:
    113
    Location:
    Tyler, Texas
    City:
    Tyler
    State:
    Texas
    You can put a piece of good round stock in the vee and use your standard edge finder to get the true center of it.
     
    Last edited: Jan 11, 2017
    Charles Spencer likes this.
  6. Uglydog

    Uglydog United States Active User H-M Supporter-Premium

    Likes Received:
    716
    Trophy Points:
    113
    City:
    Dayton
    State:
    Minnesota
    EmilioG,
    Tony once again speaks wisdom.
    However, please don't be afraid to ask for clarification.

    Daryl
    MN
     
  7. EmilioG

    EmilioG United States Active User H-M Supporter-Premium

    Likes Received:
    88
    Trophy Points:
    28
    City:
    HUNTINGTON
    State:
    New York
    I understand, but an edge finder without a DRO?
     
  8. Tony Wells

    Tony Wells United States Vice President Staff Member Administrator

    Likes Received:
    19,041
    Trophy Points:
    113
    Location:
    Tyler, Texas
    City:
    Tyler
    State:
    Texas
    Sure, they have been around long, long before DRO came along.
     
  9. Uglydog

    Uglydog United States Active User H-M Supporter-Premium

    Likes Received:
    716
    Trophy Points:
    113
    City:
    Dayton
    State:
    Minnesota
    Either an edge finder or a wiggler and hand-wheels. You can account for any backlash.
    You'll consistently get .001 or better for a few dollars instead of the $1000 that a DRO costs.
    Additionally, all the DRO does is keep track of the distance. You still need to find the edge.

    Daryl
    MN
     
  10. kwoodhands

    kwoodhands United States Active User H-M Supporter-Premium

    Likes Received:
    36
    Trophy Points:
    28
    City:
    mays landing
    State:
    New Jersey
    Lay a machine drill in the V temporarily. Pick one that appears to be the same size as the width of the V. Install the drill upside down in the chuck and use the drill to center the table. You will get better results with the smooth shank than with the drill point. Now lock the table, insert spotting drill or center drill. Now you can drill with the proper drill size.
    mike
     
  11. Reddinr

    Reddinr United States Active Member Active Member

    Likes Received:
    11
    Trophy Points:
    8
    City:
    Buckley
    State:
    Washington
    I was going to suggest something similar to mike but using a rod with a scribe point on it or a rod with a 90 degree V profile at the end and guide it slowly into the center of the V, then change to the mill/drill afterwards. What I have done in a similar situation is to have the rod move the part into the right place, then tighten vise/clamps, recheck... Works if the part is small/light. Might be cheating but no one was watching.
     
  12. Uglydog

    Uglydog United States Active User H-M Supporter-Premium

    Likes Received:
    716
    Trophy Points:
    113
    City:
    Dayton
    State:
    Minnesota
    Near as I can tell there is no cheating in any of this stuff.
    The only real rule is: is it safe, effective and work within your budget.

    Daryl
    MN
     
    EmilioG and Bill Gruby like this.
  13. EmilioG

    EmilioG United States Active User H-M Supporter-Premium

    Likes Received:
    88
    Trophy Points:
    28
    City:
    HUNTINGTON
    State:
    New York
    I'm going to use an edge finder and a Wiggler center finder. Thanks
     

Share This Page