Ever wonder what the little numbers mean on the spinny black thing on the shiny silver thing on the tonearm of your turntable? You would be surprised how many people don't know what you are actually supposed to do with it. That's what today's lesson is about.
The Tonearm:
directly above this sentence is the headshell. if you follow to the other end of the picture, at the very top, you will see a silver cylinder called a "counterweight". there are two main ways to use this: one for scratching, one for all other mixing.
..............................
MIXING
(for this part, your counterweight should be turned so the black dial is facing the needle, with the flat end on the edge of the arm, as in the picture)
Turn/unscrew the counterweight (the whole silver cylinder, not just the black dial) until it is close to the end of the tonearm. if you let go, you will notice the needle points heavily up in the air. hold the needle's handle and SLOWLY screw the weight back towards the needle. every so often, let the needle go and see whether it dips down or points up. go back and forth until you reach a middle point. now here's the cool part: when you find the center point, the needle will float midair without falling or rising.
The needle is now at Zero Gravity. WITHOUT turning the counterweight (the silver cylinder), turn JUST the black dial at the front of the weight until zero (...0...) is at the very top. you now have an exact measurement for the gravity of your needle. now turn the entire counterweight towards the needle and watch the black dial; when you reach somewhere between 3 and 3.5, you now have the correct pressure that should be on your needle. doing this every so often will make your needles and records last longer and have less wear & tear while still having enough weight not to skip around while mixing.
Most dj's know that 3 is heavier than 2, but unless you "zero out" your needle first, you don't really know how much weight is put on the needle and your records. you may have it set on 2 but if the tonearm has not been zeroed out yet, you may just be turning it from 6 down to 5 and not know it.
SCRATCHING
you should only use this setup when scratching; when mixing normally, you should change the setting to mixing (described above).
Unscrew the counterweight until it comes off in your hand. turn it around backwards and screw it back on so the black dial is facing outwards, and the flat end of the cylinder faces in towards the needle. put a crappy test record on that you dont mind damaging. give the record a strong scratch, about the most strength you think you would put into it while scratching. if the needle jumps, add more weight (screw the cylinder in towards the needle more). some dj's screw the cylinder all the way in to prevent the needle skipping during a performance, but this wears heavily on both vinyl and needle. its harder to skip the record but you will have to replace your favorite records and your needles several times. practicing scratching with a lighter touch on the record will reduce the need for weight, and save you money and equipment in the long run.
(sorry no video, but i wanted to throw a tutorial up there).