Drewfus
12-10-2003, 05:35 PM
Holes equal speed……HOLE FLARE DIE
Ages ago, here on the HAMB, we talked about holes. Holes in the chassis, holes in panels, sheet metal, holes here, there, and everywhere…..
Naturally, this got my mind ticking, how, and where could I apply a few holes to my 28 r/p/u in a tasteful, but effective manner. Keeping this in mind, I started looking at other peoples examples, from race cars, to brand new cars, even to aeroplanes and the like. With my mind wandering, I started to notice a few trends, especially on the newer cars, in particular to sizing, and their ‘flairing’. To cut down on some of my ramblings I’ll get to the point, I decided that I could effectively use 2 core sizes of holes, ¾” and 1 ¼”, both of which would have a flare that is approximately 15 degrees(this is important, I’ll explain later), by approx. 3/8” in width.
We’ve all seen fancy dies, toss them a elaborate press, and off you go………..unfortunately I don’t have that luxury. So, I had to create a cheap and easy method to get the flair, without breaking the bank. Using a 4” long piece of 2” solid bar, the following details will explain the basic process I used to create the dies.
The female die
Firstly, I drilled a 10.8mm hole through the centre.
In an effort to make 2 dies from the one bit of bar, I machined a female taper to both ends, the angle was approx. 30 degrees(from square to the centre line), with the O.D. of each taper being 46mm(for the 1 ¼” hole), and 33mm (for the ¾” hole).
I then tapped a ½” UNC thread through the centre (because that’s what I had closest to hand, a UNF thread, or a larger bolt size would be better if handy).
The male die
From an off cut of the 2” bar, I machined a ½” hole through the centre (to match the bolt), and machined a large chamfer at approximately 15 degrees (any bigger of an angle and you will have difficulty in ‘nicely’ flaring the hole, at least by hand anyway…..
See pic…….
Ages ago, here on the HAMB, we talked about holes. Holes in the chassis, holes in panels, sheet metal, holes here, there, and everywhere…..
Naturally, this got my mind ticking, how, and where could I apply a few holes to my 28 r/p/u in a tasteful, but effective manner. Keeping this in mind, I started looking at other peoples examples, from race cars, to brand new cars, even to aeroplanes and the like. With my mind wandering, I started to notice a few trends, especially on the newer cars, in particular to sizing, and their ‘flairing’. To cut down on some of my ramblings I’ll get to the point, I decided that I could effectively use 2 core sizes of holes, ¾” and 1 ¼”, both of which would have a flare that is approximately 15 degrees(this is important, I’ll explain later), by approx. 3/8” in width.
We’ve all seen fancy dies, toss them a elaborate press, and off you go………..unfortunately I don’t have that luxury. So, I had to create a cheap and easy method to get the flair, without breaking the bank. Using a 4” long piece of 2” solid bar, the following details will explain the basic process I used to create the dies.
The female die
Firstly, I drilled a 10.8mm hole through the centre.
In an effort to make 2 dies from the one bit of bar, I machined a female taper to both ends, the angle was approx. 30 degrees(from square to the centre line), with the O.D. of each taper being 46mm(for the 1 ¼” hole), and 33mm (for the ¾” hole).
I then tapped a ½” UNC thread through the centre (because that’s what I had closest to hand, a UNF thread, or a larger bolt size would be better if handy).
The male die
From an off cut of the 2” bar, I machined a ½” hole through the centre (to match the bolt), and machined a large chamfer at approximately 15 degrees (any bigger of an angle and you will have difficulty in ‘nicely’ flaring the hole, at least by hand anyway…..
See pic…….