Free 173 Best Homemade Tools eBook:  
Remove advertisements
Results 1 to 6 of 6

Thread: Starting Holes On Domes and The Ends of Rods

  1. #1
    rgsparber's Avatar
    Join Date
    Nov 2012
    Location
    Phoenix, AZ
    Posts
    421
    Thanks
    94
    Thanked 637 Times in 243 Posts

    rgsparber's Tools

    Starting Holes On Domes and The Ends of Rods

    A common way to get a drill to start at a specific location is to first use a spring-loaded punch to make a small divot. This holds the point of the drill in place until it can start cutting. If you have more than one hole to make, switching between drill and punch can get tedious.

    Here is an alternate approach that can be fabricated in seconds. It handles a range of dome sizes and also works on the ends of rods.

    If you are interested, please see

    http://rick.sparber.org/Drill_Guide_...ome_or_Rod.pdf


    Your comments are welcome. All of us are smarter than any one of us.


    Thanks,

    Rick
    Rick

  2. The Following 7 Users Say Thank You to rgsparber For This Useful Post:

    Corm (07-24-2018), Jon (07-23-2018), Moby Duck (07-23-2018), Paul Jones (07-23-2018), rossbotics (07-24-2018), Seedtick (07-23-2018), suther51 (07-23-2018)

  3. #2

    Join Date
    Jul 2016
    Posts
    106
    Thanks
    31
    Thanked 23 Times in 22 Posts
    Will have to remember this. Now if there is a trick to starting a concentric hole in a broken bolt that would be the cherry on top!! Have usually had difficulty eyeing center when the broken thread makes the bolt shaft look oval. Thanks
    Eric

  4. The Following User Says Thank You to suther51 For This Useful Post:

    Paul Jones (07-23-2018)

  5. #3
    rgsparber's Avatar
    Join Date
    Nov 2012
    Location
    Phoenix, AZ
    Posts
    421
    Thanks
    94
    Thanked 637 Times in 243 Posts

    rgsparber's Tools
    Quote Originally Posted by suther51 View Post
    Will have to remember this. Now if there is a trick to starting a concentric hole in a broken bolt that would be the cherry on top!! Have usually had difficulty eyeing center when the broken thread makes the bolt shaft look oval. Thanks
    Eric
    Eric,

    I don't see why this tool wouldn't be able to center a drill on the end of a broken bolt as long as the bolt was not bent. The threads shouldn't matter.

    Rick
    Rick

  6. The Following User Says Thank You to rgsparber For This Useful Post:

    rossbotics (07-24-2018)

  7. #4

    Join Date
    Jul 2016
    Posts
    106
    Thanks
    31
    Thanked 23 Times in 22 Posts
    Quite so if the bolt is proud of the surface, my difficulty has been more with flush or just recessed situation. Could be an indication of my impatience with such situations. Thanks
    Eric

  8. #5
    rgsparber's Avatar
    Join Date
    Nov 2012
    Location
    Phoenix, AZ
    Posts
    421
    Thanks
    94
    Thanked 637 Times in 243 Posts

    rgsparber's Tools
    Quote Originally Posted by suther51 View Post
    Quite so if the bolt is proud of the surface, my difficulty has been more with flush or just recessed situation. Could be an indication of my impatience with such situations. Thanks
    Eric
    I haven't tried these yet so they may be totally worthless:

    What about placing enough 5-minute epoxy in the hole so it domes over. Drill a piece of scrap bar with the same diameter as the hole. When the epoxy is firm, place the scrap's hole over the dome. The dome should provide alignment in the hole. Then drill down until a divot is established.

    A related idea is to use plumber's putty in the hole and strike the top so it is flush with the surface. Sight through the hole in the scrap to center. Then holding the bar firmly, start drilling the divot.

    Rick
    Last edited by rgsparber; 07-25-2018 at 07:55 AM.
    Rick

  9. #6
    Content Editor DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,087
    Thanks
    337
    Thanked 655 Times in 595 Posts
    Thanks Rick! We've added your Dome Head Drill Guide to our
    Drilling and Drill Presses
    category, as well as to your builder page: Rick's Homemade Tools. Your receipt:



    Post your reply!
    Join 33,912 of us and get our 173 Must Read Homemade Tools eBook free.



    173 Must Read Homemade Tools

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •