Hi all, I have an idea for a new invention but have a problem with machining a part, Imagine a 40 mm dia X 50 bar with a 20 hole through, one end of the bar has a 20 degree countersink forming a sharp edge to the OD. This csk blends with the 20 bore by a 14 mm radius-looks like a trumpet mouth. Easy enough by cnc - here's the catch, the 20 bore is threaded ( say 1.5 mm pitch ) and this thread needs to follow the radius and the 10 degree face! the thread form must be square to the bore ( obviously ) and the radius tangeant and the angled face, the pitch over the changing diameter must also remain constant-imagine being able to roll a similar pitch screw over the profile so all the threads engage. Is this possible to do ?, I know our cnc turners at work will shake their heads, but not yet asked, It needs something like a cnc lathe with a tool that progresively rotates as it moves over the profile. Is there a set-up that is used for any similar job any where? The only thing I can think of at the moment is one of those B&Q type door stops with a conical spring, which doesn't really help. All advice appreciated, Cheers, Mark G.
- posted
17 years ago