i see the guys on american chopper using what i guess is an impact hand drill to put holes in steel framesI use long tubing and the impact drill would save me a lot of time.
Why do jeans shrink? Believe it or not, shrinkage is a bonding experienceThe cotton fibers of your jeans are made of lots of small molecules, linked together to form huge chains of molecules called polymersWeak links called hydrogen bonds connect the polymer chains end-to-endWhen the bonds break, the polymers crinkle upResult: shrinkageCould you start at the begining? SureLet's go back to when your jeans were madeWhen cotton fibers are spun into threads, they-and the polymers they're made of-are first pulled and twistedThat puts stress on the hydrogen bondsThe bonds are stressed even more before weaving, when the threads are stretched on a loomSo much stress breaks the bondsBut new ones form to hold the polymers in the stressed out stateOf course, the polymers want to return to their natural relaxed stateTo do that, they need bond-breaking energyYou help by throwing your jeans in the washHow? Chemicals, such as water in your washing machine, or heat in the washer or dryer privide the energy needed to break the stress-producing hydrogen bondsWhen the bonds break, the polymers crinkle up and relaxThat's when shrinkage happens, says Ravichandran.
You don't want to use an impact to drill withIf your part is small enough to fit on a drill press then drill it there, you will get a straighter hole than with any hand toolIf your part is too large for a drill press, use any kind of hand drill (air, corded, cordless), you wont need anything too heavy duty for aluminum (it's pretty soft metal)Just make sure that you have a good sharp bit and use plenty of oil to prevent gallingIf you tubing is that long, you might think about getting a roller conveyor or two to help support it while you are using the drill pressIt might save you some time.
