Countersink cage too big for countersinks near flange

[Fred's12#524]

I am wondering what others have done regarding countersinking in close proximity to a flange. I have a 1 inch diameter countersink cage but it is too large to countersink some of the rivet holes in the Upper Caps. ATS has an 11/16s diameter cage but I am not convinced that it will work. Thanks.

FM

[boom3]

I don't have a picture to share, but I ground one side of the cage off. Just make sure you keep enough so that you can still hold it flat.

[java]

If you're careful, do it freehand with the countersink bit without the cage.

[J.Coles]

You can buy the counter sinks that are designed to be used freehand. They save you time on the thinner parts where you will get chatter if you dont use a backup behind the part you are counter sinking. If you pracitice a few times you will get quite good at getting the depth correct.

Julian 120316

[compren]

I think you can also take your countersink bit and screw it into your speed deburring tool if so desired...I wouldn't want to countersink for a #8 screw using this method, but for countersinking for rivets in tight places it'll do fine.

[rapid_ascent]

Look on ebay you can find countersinks with are partial cages. That sounds like it should take care of your problem.

[Auburntsts]

I used my regular hole deburring tool (which is really just a pilot-less countersink bit) to handle a couple of countersinks that I couldn't use my microstop on--worked just fine.

[clevtool]

If you want to freehand, but need an extension you can pull the countersink apart pretty easy and use the shank. Keep track of how the parts go together.

[rivetshaver]

At my place of work, we call the pilot less cutters, "suicide countersinks", if not carefully used the name is appropriate.
Greg.

[Fred's12#524]

Thank you to everyone for your ideas and support. I am now back onto finishing the V-stab and moving on to the rudder. This is a great family to belong to.

FM