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Step 4Cutting the head off
I used a calculator on this website: http://www.turnpoint.net/wireless/cantennahowto.html to find my measurements
Using a close estimate of what the inside diameter might be, about 3-1/8, I decided to cut as close to the top as possible, but without any of the curve from the tops shoulder left behind. I could shorten the can later, if needed
This is where that piece of paper comes in. This is a standard technique that I use on so many other projects, that it probably should have it's own instructable. But it's the first time I'm bringing this up, so I'll include it here
I'm going to be using a hand-held hacksaw, and I want to make a nice and even cut so that the top is square and flat. A quick and easy way to do this is to first draw a line to use as a guide, going around the extinguisher
To do this, I wrap the paper around the can, and because it's a standard printer paper, it has a very straight edge on all sides. This means that after wrapping it tight, and after adjusting the paper so that the edges where it meets are lined up with each other, all I have to do is slide it up to where I want the cutting line, then carefully draw along the edge of the paper, all the way around the top of the extinguisher.
Once I have a nice cutting line to go by, I follow that with the hacksaw and proceed to cut the top off. The after the top is off, I went over it with a flat file to even it down and give the inside edge a nice crisp corner. I think that any imperfections here might disturb the radio wave
Using a close estimate of what the inside diameter might be, about 3-1/8, I decided to cut as close to the top as possible, but without any of the curve from the tops shoulder left behind. I could shorten the can later, if needed
This is where that piece of paper comes in. This is a standard technique that I use on so many other projects, that it probably should have it's own instructable. But it's the first time I'm bringing this up, so I'll include it here
I'm going to be using a hand-held hacksaw, and I want to make a nice and even cut so that the top is square and flat. A quick and easy way to do this is to first draw a line to use as a guide, going around the extinguisher
To do this, I wrap the paper around the can, and because it's a standard printer paper, it has a very straight edge on all sides. This means that after wrapping it tight, and after adjusting the paper so that the edges where it meets are lined up with each other, all I have to do is slide it up to where I want the cutting line, then carefully draw along the edge of the paper, all the way around the top of the extinguisher.
Once I have a nice cutting line to go by, I follow that with the hacksaw and proceed to cut the top off. The after the top is off, I went over it with a flat file to even it down and give the inside edge a nice crisp corner. I think that any imperfections here might disturb the radio wave
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