Reverse Countersink Wanted

[Tom Bender]

When drilling wood the burrs at the surface go one way. I have a handheld countersink to clean these up but it is not very effective. It just makes a bigger burr. If it was sharpened to cut when rotating counterclockwise it would lip them off clean. Anyone seen such a tool?

[Lee Schierer]

Do a google search for left hand countersinks.

[johnny means]

I'd question why your counter sinks aren't leaving cleaner cuts.

[Van Huskey]

I'd question why your counter sinks aren't leaving cleaner cuts.

This, I have both Fuller and Whiteside and never had an issue, but the OP may be cutting into some unusual wood/material.

[Bill Orbine]

OP might be cutting into green or wet wood!?!

[Darcy Warner]

Oh, counter sinks, I read cowgirl....

[John K Jordan]

If particular wood doesn't cut cleanly and the bit is sharp sharp it helps to apply a bit of thin CA glue to the chamfer before the final cut. Lacquer or shellac sanding sealer also can help but takes longer to dry.

[glenn bradley]

I'd question why your counter sinks aren't leaving cleaner cuts.

Bingo. Get a better, or sharpen your current, countersink and you won't need to fix a problem that shouldn't exist ;-) I agree that some woods have fibers that are more prone to lay down or tear out as opposed to shear off. I routinely pre-seal things like shedua with a 1lb cut of shellac. If that will interfere with your finishing protocol you can just put a couple drops where you plan to drill. Glue size works too but, to avoid finishing issues a nice sharp bit is my best answer. Maybe switch to a type that you can easily touch up in the shop. I have an Amana (or something like it) with carbide cutters and a no-mar depth stop that leaves very clean, almost polished couter sinks. In the drill press, this one from Lee Valley (http://www.leevalley.com/US/wood/page.aspx?p=41012&cat=1,180,42240,42281&ap=1)is my go to. For hand held I stay with these styles (https://www.amazon.com/Weldon-99046-94-W-SET-Flute-Countersink-Deburring/dp/B00Q5INRUQ)except for difficult materials. Here's the result in BB-ply.

397179

[Bill Dufour]

I question your logic. The grain will reverse from one side to the other. There is no good way to counter sink half the circle with one bit and the other side with a different one.
I like aircraft piloted caged countersinks.
Bil lD.

[Van Huskey]

I like aircraft piloted caged countersinks.
Bil lD.

Doesn't the pilot get cramped up living in that little space? :) Maybe he has been bad though since the put him in a little cage as well.

[johnny means]

Do you mean something like this?

[Bill Dufour]

Do you mean something like this?

I wonder if the picture is reversed or is that countersink somehow easier for left handed folks to use.
Bill D.

[Bill Dufour]

Doesn't the pilot get cramped up living in that little space? :) Maybe he has been bad though since the put him in a little cage as well.

May be they are used to make planes for Con-Air

[Bob Vaughan]

Weldon CS-18 will do the job. Been using them for 30 years or more. Carbide is awful. Most other countersink designs produce that hairball mess no matter what the seller might say.

https://www.mscdirect.com/product/details/02541225

[Tom Bender]

Thanks Jonny, that is what I am looking for.

Bill, you are right about making a burr the other way but I am hoping to use it just enough to remove the drilling burr and not start another one the other way. For actual countersunk holes another solution is needed.

Bob, I have two sizes of these and they can work great but there is a problem with them also. The angle of the cutting edge changes depending on the diameter.

The burrs hang on to stringy wood. They can be sanded off but sometimes it is at an inconvenient point in the finishing schedule.

[Bill Dufour]

FYI: caged countersink is like a plunge router. depth is easily ajustable, repaetable to 1/1000". Teh bits screw into the arbor. 1/4-20 is most common size shank.

https://www.browntool.com/Listview/tabid/344/CategoryID/62/Level/a/ProductID/3020/Default.aspx

[Tom Bender]

Bill
Are the cutters sold separately?

[Matt Day]

Oh, counter sinks, I read cowgirl....

Lol, get your head out of the gutter Darcy.