Instruction: Answer the given question using the supporting document.

Input:
Question: At what angle does this unit sharpen?
Document: It's quite and that's the biggest plus. It will remove some steel from the blade if you're not careful though. The reason I gave the unit a four and not a five is because you can select the angle of alignment. It's one angle fits all. Lastly, with knives that have needle points such as filet knives, it's very hard to keep the tip from being grinded off if you do not remove the knife before completing your stroke. I would highly recomment this unit to anyone who wants to just sharpen kitchen knives.
I bought this sharpener mainly on price. That was a mistake. It will sharpen your knives and cleavers. However, in my opinion, this unit is to aggressive. It would be easy to burn the knife or remove excessive metal with even the finest wheel. It is a high speed set of grinding wheels fitted with a poorly designed set of guides. The guides flex to much to hold a consistent angle. You are essentially grinding freehand. I have some experience with bench grinders and was able to get an acceptable edge.
IF they locked into position then the angle would be secure for both sides of the edge. They are more of a &#34;guide&#34; than a fixed jig setup. The motor is under powered with any pressure exerted on it, but if you let the wheel do the work and go over and over it will do the job. I had a used chefs choice 100w unit that i sent back, it did not get the knives sharp at all and left little swirly circles on both sides of the blade.
I know I can use one of these, but perhaps this one was not working right. Other reviews had this as a great item. Unfortunatly that was not the case in my experience. I have a Chef's Choice that works very well, but doesn't work on thick blades like hunting knives, that's why I tried this unit. In my opinion this is too rough on the knife. It has a lot of chatter when you apply the blade to the wheels and it stalls too easily. The guide springs are too weak to hold the blade in the correct angle.
I had high hopes for this sharpener based on mostly positive reviews. To my disappointment:* Low-grit stones grind a lot of material with sparks flying around. Would not risk expensive tempered blade on it. * Third stage is still too rough. It also wobbles on my unit and leaves uneven groves. Ended up re-sharpening my knives to remove these groves. * Variable angle, the main point for me to buy this model, does not hold the edge firmly enough. I can see it giving in.
It is important to position yourself so that you are pulling the knife in a straight line towards yourself to keep the knife along the guide and at a consistent angle to the wheel. Since this is done at a slight angle to the unit, I move my body left or right accordingly. When I am using one of the sharpening slots, I angle my body so that my shoulder and arm are in line with the direction of knife motion. I also count the number of seconds that it takes me to complete the motion to make sure that I am not going too slow or too fast.
This is a good sharpener. I've used it once on knives I use to clean fish. After trying other methods to sharpen these knives I purchased this unit and it did the job...nice smooth sharp edge.
Good price for a unit that I have used to sharpen my kitchen knives AND my machete. I love the 3 stage wheels but have to say that the best sharpening I get is when I only use stage 1 and 2. Stage 3 I just cant seem to get the hang of and more often than not seem to loose the great edge I get on stage 2.
So, we all have knives in the drawer that we have tried and tried to sharpen but they always turn out dull and you have to use them like a saw to get through anything you are cutting. This Presto sharpener works like a champ. I gave it as a gift and once it was opened, everyone started pulling knives out of the hostesses' drawer so they could sharpen one. It made them really sharp. It's a three-stage process that goes from rough to very fine. The unit itself is heavy--heavy enough so you don't have to hold on to it while you draw a knife through it.
Caused burring on my Global knives. Not the correct angle for Japanese knives. Does not sharpen my knives well at all, and I think there is something wrong with the one I got.
Answer: The angle is adjustable to three different positions but the exact angle is difficult to measure without an optical comparator.  Lowest angle is for thin knives like a fillet, and the highest angle is for things like cleavers.  However, there is nothing to prevent you from sharpening a cleaver to the angle normally used for a fillet knife.  I work in the medical device industry where we sharpen surgical needles.  I inspected the sharpened edge using a 10x eye loupe, and the results are fantastic.  A little bit of micro serrations on the edge creates a very sharp cutting surface.  I have sharpened knives for many friends and they were all amazed at the quality and sharpness of their knives.Update: After 2 years of use, it is still going strong and one of my favorite tools. Very easy to use once you get the "smooth pulling the knife towards you" technique down.