Anyone have any idea what these are

[rik arryParticipant @rikarry]

Can anyone shed light on what these maybe , some sort of broaching tool ?
any help appreciated.

[rik arryParticipant @rikarry]

Broach ?

[Pete RimmerParticipant @peterimmer30576]

Positive stop countersinks. I have a couple, one with multiple cutting bits the other a fixed one for aircraft rivets.

You pull the sliding collar back and turn that collar to adjust the stopping depth.

[old martParticipant @oldmart]

As drilling holes in aircraft skins has to be perfect, these adjustable countersinking tools were first tested on a specimen sheet of aluminium and passed by inspection having had the countersunk made measured and found to be in tolerance. The design made fast countersinking to tight tolerances safe to carry out.

[rik arryParticipant @rikarry]

THANKS 🙏

😊

[SamsarandaParticipant @samsaranda]

Positive stop countersinking tools, I used them constantly when riveting aircraft skin and structures.
Dave W

[Bill Davies 2Participant @billdavies2]

Are these free-running so that they don't mark the work when they contact it?

Bill

[Pete RimmerParticipant @peterimmer30576]

Yes that's right Bill. The outer ring with the holes in it doesn't turn. I countersunk a painted item without marking it but you have to watch out that the swarf doesn't scuff the paint.

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