Custom specialised drill for dog holes - interested?

[FenceFurniture]

I'm thinking of getting a small quantity of specialised drills for dog holes made. It would be 3/4" HSS M2 steel, and have black rings etched around the flutes, every 10mm so you would have a pretty good idea of the drilling depth. Perhaps the 50mm and 100mm rings could be heavier or darker. Flute length 130mm, overall length 196mm, and the rings would be measured from the spurs, not the brad point.

The other idea that I had was to make the chuck end of the shank a "RotaStop" grind, which is eccentric. This would heavily limit slippage in the chuck and also allow the drill bit to be used with the RotaStop extensions (90, 150 & 270mm).

The idea came to mind because of the sheer number of bench builds lately.

I have considered a tungsten tipped Scotch pattern Auger (thanks Groggy), but this can't be done in the same steel, TC cannot be sharpened to the same level, and the surface inside the holes would be rougher (no big deal?) but the entry hole would be nowhere near as good. Exit wound can be fixed with a round over router bit I suppose, and maybe even the entry hole, as Groggy did. I still prefer the Brad Point idea at the moment.

These would not be a cheap drill, mainly because of the production numbers, but when you need the right drill........

What do you think?

[Trav]

FF - depending on costs, I am interested. I don't get back to Aust until July, but I can see a new bench in my immediate future when I return.

Trav

[FenceFurniture]

Rightio Trav

[FenceFurniture]

Over in this thread I also started discussing this Dog 'ole drill, so I would prefer to keep the discussion in one place. Anyone who has some input or who would like one one is welcome to post in that thread.

It will be from the Colt Five Star FCE range which is HSS M2 steel, and for those not familiar with them these drills are as good as they get for timber drilling.

I would like to get cracking with this development so that it can coincide with the delivery of the current order that is with Colt.

Here are some pics of the tip geometry: