Flanges

Home Distiller Flange

There are times you need the extra strength of a flanged connection that is bolted or clamped together. The flanges that make this possible are relatively easy to make yourself.

A flange is just a flat rim on the end of the pipe or tubing, produced by soldering or welding on a flat plate with a hole in the middle that matches the size of the pipe. Flanges may be any shape, but round and square are the most common. Spring clamping flanges together may be enough to hold two pipes securely, but bolting them together provides a much stronger joint. Two types are most common, the 3-hole flange and the 4-hole flange.

3-Hole Flange

3-Hole Flange

Bolt Circle Drawing

If you draw a circle with a compass, then you can easily mark off three equidistant points for bolt holes. Just mark where you want one of the holes to be on the circle, then draw a line through there and the center of the circle, to meet the circle on the other side. Using that point as the center, mark off an arc of the same radius as the circle. It will meet the first circle at two points, and these will be where you drill the other two bolt holes. You can cut whatever size hole you like in the middle, using the center of the first circle.

4-Hole Flange

4-Hole Flange

4-hole flanges are even easier to make as you can get metal of almost any thickness you need in straight-sided flat plates. Mark off the amount you want to cut off so you end up with a square of metal, and find the center by drawing diagonal lines. Using your compass again, draw a couple of circles from that center, one to mark out the big central hole and the other to show where the bolt holes will lie. The bolt holes will be where the diagonal lines and the outer circle intersect.

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Responses

  • earl
    How to mark off a four hole flange?
    7 years ago

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