Paddle Scraping - KitchenAid Professional 600

Look at the bottom of the bowl to see if it's dented first. Replacing the bowl is the only fix.

go to mending shed . com and you can find it on their home page for download in pdf format

You can adjust the mixer bowl up and down slightly. If you lower your bowl and look at the back you will see a little screw, it looks like a flat head screw and it is on the "neck" of the mixer.
You can raise and lower the bowl by adjusting this cam screw. You can tell that your bowl is adjust correctly by attaching the flat beater and put a dime in the bottom of the bowl, the beater should just barely touch the dime and move it around the bottom of the bowl.

The beater will not scrape the sides of the bowl, if you are wanting the sides of the bowl scraped I would recommend the Flex Edge Beater made by KitchenAid which is basically a flat beater with a rubberized edge which will scrape the side of the bowl as it rotates.

Here is a link to the flex edge beater on our website: http://www.mendingshed.com/kfe6l.html
Let me know if you have any other questions.
Thank you,
ColleenCustomer ServiceMendingShed.com800-339-9297

Tip the mixer up and look for a screw on the hinge underneath the top part. Turn this screw counterclockwise about 2 turns and the paddle will clear the bototm of the bowl.

Find the screw in the picture as shown and screw it counter-clock-wise which will drop the bowl level down when it is in the raised position and the mixer paddle will not rub on the bowl.
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There's an adjustment screw as shown in the picture.
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Screwing this screw clockwise will raise up the bowl so the mixer paddle reaches closer to the bottom. Don't go too far, the paddle will start hitting the bowl.

There is a screw that turns about 180 degrees on the stand behind the bowl that fine-tunes the height of the paddle.

It is going to low down. the adjustment should at the back of the unit.

The solution provided by luannej is useful only if your mixing attachment is striking the surface of the bowl. By adjusting the screw located at the junction of the head and base, you are actually controlling how far the head is allowed to tilt forward and, thus, the height of the attachment above the bottom of the bowl. Although the attachment striking the bottom of the bowl will lead to wobble (and noise!), it isn't usually the root cause of the wobble. In fact, the wobble may be causing the bowl strikes and adjusting the head height only hides the problem.

The head of the mixer is secured to the base by a large steel pin. Any play between the head and base comes from this hinge and its resulting tolerances. To "tighten" the sloppy tolerances causing your wobble, follow these steps: 1) Lock the mixer's head down and turn the entire mixer upside down. 2) Looking deep into the hollow base, find the small slotted set screw. This screw actually presses against the pin and takes up the slop between the head and pin. Note that this screw is not the large slotted screw I mentioned earlier visible when you tilt the head back. 3)Tighten the small set screw as much as you can. Your wobble should be greatly reduced or eliminated now. 4) Lastly, you may want to readjust the large screw controlling the head's tilt to optimize the distance between attachment and bowl. Hope this helps.

Read the instruction manual. There is a screw to adjust the beater height, it is where the mixer joins to the stand.