- Joined
- Feb 13, 2017
- Messages
- 2,138
I know such a thing esists, or at least existed at one time. I have one, but too large to be of use to me. (>1 inch) I had always thought of it as being a boiler maker tool since I have never seen another one. I would like to find some smaller ones, although I may not be able to pay for them. But finding them is the first step. Specificly, if one is drilling a starter hole for a pipe tap or an MT-2 or 3, the accepted procedure is to drill for the small end first, then drilling to a reduced depth for the larger end. There must be, for production operations, a tapered drill for those two tapers and perhaps others.
I did find smaller sizes for wood working. Specificly, for wood screws of 3/16" and smaller. Wood screws do have a radical taper. But larger sizes seem to not exist any more, especially for metal. The largest size I found anywhere was for a 3/16" (Nr 10) screw. I have in mind to build a manifold for a compressed air line. I have built them in the past using the shop accepted norm of drilling twice. They don't have to be reamed, just a hole drilled large enough to start the tap.
While studying on the project, it occured to me that Morse tapers have to be started the same way but with more steps. And reamed after that, first a roughing and then a finish reamer. Reaming a straight hole is possible, but a lot of material must be removed. Meaning many rotations of the roughing reamer to get that tapered hole. Personally, I don't foresee any need (at this time) for making a MT-2 taper from scratch. But if I should, there must be a way simpler than drilling repeatedly.
I don't recall the specific size drills I am looking for, just the finished sizes of the tapered holes. From 1/16 pipe for model building to 3/4 pipe, the largest IPT tap I use. Plumbing stuff. . . I have larger sizes for doing rigid conduit, up to 1-1/2 pipe, but haven't worked rigid for years. And see no need to in todays electrical economy with pre-tapped cast boxes. And MT-2 and 3, the largest tapered holes on my machine tools. I don't have, any more, MT-0 or MT-1 machines. But if I could afford such drills, having those sizes would ease my mind.
Are there any others out there that have the same curiosity or need?
.
I did find smaller sizes for wood working. Specificly, for wood screws of 3/16" and smaller. Wood screws do have a radical taper. But larger sizes seem to not exist any more, especially for metal. The largest size I found anywhere was for a 3/16" (Nr 10) screw. I have in mind to build a manifold for a compressed air line. I have built them in the past using the shop accepted norm of drilling twice. They don't have to be reamed, just a hole drilled large enough to start the tap.
While studying on the project, it occured to me that Morse tapers have to be started the same way but with more steps. And reamed after that, first a roughing and then a finish reamer. Reaming a straight hole is possible, but a lot of material must be removed. Meaning many rotations of the roughing reamer to get that tapered hole. Personally, I don't foresee any need (at this time) for making a MT-2 taper from scratch. But if I should, there must be a way simpler than drilling repeatedly.
I don't recall the specific size drills I am looking for, just the finished sizes of the tapered holes. From 1/16 pipe for model building to 3/4 pipe, the largest IPT tap I use. Plumbing stuff. . . I have larger sizes for doing rigid conduit, up to 1-1/2 pipe, but haven't worked rigid for years. And see no need to in todays electrical economy with pre-tapped cast boxes. And MT-2 and 3, the largest tapered holes on my machine tools. I don't have, any more, MT-0 or MT-1 machines. But if I could afford such drills, having those sizes would ease my mind.
Are there any others out there that have the same curiosity or need?
.
