The world of model and hobby engineering

Subscribe

The Modelling Hub Logo

The world of model and hobby engineering

Subscribe
Buy Latest Issue

Forums

Help

Register

Log in

Unusual drills

Advert
New Replies
Report Bug
Help/FAQs

Unusual drills

Home › Forums › Workshop Tools and Tooling › Unusual drills

Viewing 8 posts - 1 through 8 (of 8 total)
  • Author
    Posts
  • 30 March 2019 at 18:31 #402849
    Maurice Cox 1
    Participant
      @mauricecox1

      I was sorting though some bits and pieces that came from an old friend's workshop. Still sealed in a packet are what at first sight looked like a couple of 1/8" drills. However, looking more closely, the last 5/32" of the shank on the cutting end has no flutes, and the cutting face on one is like a pyramid, the other is chisel like, i.e. a straight line across the centre and an inclined face at about forty-five degrees on either side. As they are packed together I assume they are intended to be used together, perhaps for drilling hard material in a two stage process. Can anyone tell me what they are really for, and how they are used please?

      Maurice

      Advert
      30 March 2019 at 18:31 #19291
      Maurice Cox 1
      Participant
        @mauricecox1
        30 March 2019 at 18:53 #402855
        David Standing 1
        Participant
          @davidstanding1

          A photograph would help smiley

          31 March 2019 at 00:13 #402898
          Maurice Cox 1
          Participant
            @mauricecox1

            Yes; I'm working on that. My camera is on the blink at the moment; I am trying to borrow one. I'll post pictures as soon as I get it.

            Maurice

            31 March 2019 at 09:34 #402920
            robjon44
            Participant
              @robjon44

              Hi, I think that what you have there are drills for armour plate, think wear plates on blades of motor graders & similar earthmoving machines, made from Stellite modus operandi under very heavy drilling pressure the drill itself & the material rise to red heat, anneals & then allows the drill to pass through, a classic case of brute force & ignorance! not really the sort of thing you need in a your shed. Naturally I have some that I acquired years ago, around half inch diameter, I would not subject any of my own equipment to that kind of abuse BUT Stellite can be ground with green grit or diamond wheels into lathe or shaper tools that will withstand large amounts of abuse without flinching.

              robjon44

              31 March 2019 at 09:55 #402924
              David George 1
              Participant
                @davidgeorge1

                Are they flow drill drills I used them in the past to make panels for machines from thin steel plate. They heated the steel by rotational friction in a drill or mill and forced the steel through hole to make a boss which you could tap because of the thickness if the material increase.

                David

                31 March 2019 at 18:46 #402975
                mark costello 1
                Participant
                  @markcostello1

                  Any idea what the friend did for a living?

                  1 April 2019 at 10:44 #403048
                  PekkaNF
                  Participant
                    @pekkanf

                    OMEGADRILL?

                    http://omegadrill.com/

                    I (mis)used one to drill into hardened steel pin.

                    Edited By PekkaNF on 01/04/2019 10:45:05

                  • Author
                    Posts
                  Viewing 8 posts - 1 through 8 (of 8 total)
                  • Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

                  Latest Replies
                  Report Bug
                  Code of Conduct
                  Help & FAQs
                  Advert

                  Latest Replies

                  Home › Forums › Workshop Tools and Tooling › Topics

                  Viewing 25 topics - 1 through 25 (of 25 total)
                  Viewing 25 topics - 1 through 25 (of 25 total)

                  View full reply list.

                  Advert

                  Latest Issue

                  Subscribe
                  Buy Latest/Back Issues

                  Newsletter Sign-up

                  Latest Replies