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The MAG Machine will work on any woodwind instrument. It is used to detect even the smallest leak in a pad, defect in a tone hole, etc. This will take your repair work to another level! The purpose of the MAG machine is to determine if an instrument is leaking and to help locate leaks that cannot be found with other traditional methods such as leak lights and feelers. The machine will also show you the degree of leakage in increments on the dial gauge. The MAG will even show you minute leaks including leakage from your fingers on clarinet holes and French flute holes (yes, these affect performance!). Once the machine is calibrated, a perfect seal will read 0 on the meter. Therefore a "perfect job" will read 0 with light (first touch) pressure on the keys. Works with any power supply from 100 to 240 volts AC, 50hz to 60hz
Standards may vary according to the style of pads used, the nature of the instruments quality level (professional, student, etc.) You may find that you achieve a different result on instruments with cork pads than you do with bladder pads on flute, or synthetics such as Valentino pads will seal better than bladder, and so you may wish to assign different standards for different styles of jobs. Many manufacturers are using the MAG, and their standards may be different than a technician's. Differing work situations and pressures create differing needs. Once standards are established however, consistency is the challenge, and this is where the MAG comes in, providing results that are visible and not highly arguable.
The MAG is used not as a first test but rather as a second or even third test. The MAG is a supplement to, not a replacement of your feelers and lights. However, these machines are used frequently in front of the customer when doing diagnosis and estimating. It is a visual representation of the general leak-wise health of the instrument. (Be prepared to show the customer the results after the work has been done also). The MAG does not isolate the leak to tell you specifically where it is. The devise will only show you if, and by what degree, a sections of tube is leaking. Therefore it is up to the user to seal the tube at various points along its length to isolate leaks (see selection of plug assortments below for sealing the tube).
CLARINETS, PICCOLOS, OBOES, ENGLISH HORN, BASSOON
You can plug all holes in the body joint with the MAG hose inserted in one end. If you are not happy with the reading, press down on keys individually to see if the the pressure improves the reading. If so, then the pad coverage is at fault. If this is not the issue, remove the keys. Now check the body alone with all keys off. Occasionally you will find leaks in the body along a subtle crack, a post-hole that leaks into the body, etc. If you have such a leak, you can submerge the body joint in a bucket of water while testing and you will see bubbles at the trouble spot.
Once certain of body integrity (the body reads 0), assemble one key at a time. If you see a jump in the reading the key you just installed is leaking. Leaking can come from grain in a cork pad, cracks or holes in pad skins, spring tension that is too light on a key that is spring closed, or tone hole defects. Tone hole defects include checks, un-level faces, and open grain.
After testing with a leak light and feeler, plug one end of the flute with a stopper. If the flute has French open-holes, plug those with stoppers or use wetted fingers to seal. Insert the MAG hole in one end. If you are not happy with the reading, press down on keys individual to see if the pressure improves the reading. If so, then the pad coverage is at fault.
Once pad coverage is certain, if the flute does not reach acceptable limits, use #2845 FLUTE LEAK ISOLATOR to isolate the flute tube along its length so the the user may determine the area of the leak. Once the leak (specific pad and tone hole) is found, check again the integrity of the pad coverage and key-to-key adjustment. Once this checks out, you must have a leak at the pad skin, the pad washer, the bushing (grommet), or the tone hole itself.
If this is not the issue, remove the keys. Now check the body along with all keys off. You may find leaks in the body alone such as at solder joints including tone holes and boxes (receivers). You may even occasionally find a small hole in the body tube itself. If you have such leaks, you may submerge the body joint in a bucket of water while testing and you will see bubbles at the trouble spot. Leaking can come from cracks or holes in pad skins, spring tension that is too light on a key that is sprung closed, and tone hole defects. Tone hole defects include checks, un-level faces, and machining marks. If you press on the G# or D# key to seal and find that the pad had been blowing open, you may wish to adjust down the air pressure. This assumes you do not wish to increase the spring tension.
Many technicians regularly use the machine to detect brass problems including leaks around pistons and solder joints. Plug up various tubing points or bell flare and then insert MAG hose in the mouthpiece receiver.
Includes 36" (0.91m) hose, 5 plugs for plugging body joint ends on Bb soprano clarinet and soprano flute, and complete instructions. Additional plugs, including plugs for sealing tone holes, are available. 2 year manufacturer warranty.