Use a tension meter to control inverse tensioning so the printing tension-not the static tension-is equal at all points on the image." The percentage difference in weft-to-warp count should equal the percentage difference in warp to weft elongation.įinally, always stretch so the glossier side of the mesh is the stencil side. So, once properly stretched, the openings of the mesh will be square. The ideal mesh count(s) would have a slightly higher weft count. Stretch the mesh by its prescribed elongations in order to equalize the strain on both warp and weft directions. Our screen of 27N/cm in the center and 19N/cm² at all four corners will print at a consistent 35n/cm² at all points.įor optimal screen performance and extended screen life recognize the warp must be elongated slightly more than the weft. In order to achieve consistent 35N/cm² printing tension, the static tension at the corners of the image must not exceed 19N/cm². This means at our 1/8" gap, the edge printing tension will be 16N/cm² greater. However, at the edges of the image, where the mesh-resistance-to-deflection is higher, the same 305 may build at a rate of 2/N/cm²/0.015" (or two times as fast). The center static tension, then, must be a minimum of 27N/cm² to transfer ink at the center of the screen. Our dynamic or printing tension must be 35N/cm² and the stress-strain of the 305 mesh equates to 1N/cm²/0.015". "Let’s say the off-contact gap is preset at 1/8". There is a good article about screen tension on I have posted a link on another forum and will post it here as well. I'm going to be stretching some of my own screens, so I think I'm going to give the drum Dial drum tuner a try. "Zeroing" the DrumDial on glass or marble is only important for this purpose." The numbers are completely ambiguous to us but they make nice reference points for those who want to log their results, to quickly attain "repeatable" results with the next set of heads. I like my toms right between the White-Handed Gibbon and the Yellow Spotted Amazon River Turtle. It could be tiny pictures of zoo animals, for all I care. Sometimes, I'll just rotate it to get a more convenient number to read. And I'm glad the scale can be rotated around to change the position of the numbers. I almost wish they didn't even have numbers on there. I suppose we could pretend the numbers are "tension units." This tells us that the Tension Watch is more sensitive, so it must ne better, right? Not necessarily- more on that later!īut what good does a measurement of distance do for us? This is confirmed when I measure the same turn of a drum key with each device. Or, the Tension Watch would move 2-1/2 small marks for every 1 small mark on the DrumDial. This means that if both the Tension Watch and DrumDial were to measure the same movement of distance, the dial readout needle on the Tension Watch would move 2-1/2 times as far as the DrumDial. So each small line on the dial indicates 1/100th of a millimeter, or 4 10,000ths of an inch. The Tama Tension Watch is metric and measures 1 millimeter for every revolution of the needle. So each small line on the dial indicates 1/1000th of an inch. The DrumDial measures 1/10th of an inch for every revolution of the needle. Since increasing the tension of the drum head decreases the amount of pressure countering the needle spring, the distance decreases and is reflected in the reading on the dial scale. The dial scale is indicating is the distance of the drum head from the surface of the aluminum base, not the tension. It doesn't have enough strength to push a hard material like glass or metal away from the base. The spring has enough strength to push against the pressure of the drum head, enough for the needle to move the drum head away from the surface of the aluminum base. It was never designed nor intended to be used to measure anything with "give" to it, like a drum head. The reason the DrumDial works in giving a measurement of tension (ambiguous, but useful for the application), is because of the spring used in a dial indicator to push the needle out of the dial housing. Only question is how to convert the measurement to tension.
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