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Anyone have any idea what these are

Broach ?

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rik arry	12/11/2020 19:37:22
56 forum posts 3 photos	Can anyone shed light on what these maybe , some sort of broaching tool ? any help appreciated.
Pete Rimmer	12/11/2020 20:14:55
1486 forum posts 105 photos	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 mart	12/11/2020 20:34:25
4655 forum posts 304 photos	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 arry	12/11/2020 20:55:13
56 forum posts 3 photos	THANKS 🙏 😊
Samsaranda	12/11/2020 22:15:57
1688 forum posts 16 photos	Positive stop countersinking tools, I used them constantly when riveting aircraft skin and structures. Dave W
Bill Davies 2	12/11/2020 22:41:14
357 forum posts 13 photos	Are these free-running so that they don't mark the work when they contact it? Bill
Pete Rimmer	13/11/2020 06:30:06
1486 forum posts 105 photos	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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