Wednesday, March 2, 2011

What kind of burr can the sPINner magnetic deburring remove?

What kind of burr can the sPINner remove?
We are often asked, “What kind of burr will the sPINner remove?” The standard answer is “a light burr”. This answer leaves a lot of room for interpretation. What is a light burr to some will be a heavy burr to others.
 The rule of “Thumb”:
In order to form an initial evaluation if the sPINner will work on a particular part try the rule of “thumb”. As a general rule, if you can take a fingernail and remove the burr, the part has a good chance of testing well in the sPINner. Burrs heavier than this may tend to roll and flatten, but not be removed during the process. 
A quick lesson on burrs:

To the left is a drawing of a cross-section of a burr on a part. From the drawing you can see some main areas we will be concerned with; the part itself (parent metal), the burr thickness at root, burr thickness, and burr height. 

Light Burrs
A lighter burr can be loosely defined as a burr with a thin thickness at root (B1). As the amount of material holding the burr to the parent metal increases, a more aggressive deburring action is required to remove the burr. Using this definition it is possible to have burrs that are tall, yet are “lighter” by our definition because the thickness at the root is small. Burrs of this type are good candidates for the sPINner. 

Short Heavy Burrs
An example of short, yet heavy burrs are the ridges created from drilling. When a drill breaks through a part a ridge is pushed up around the hole on the side where the drill breaks through. While this ridge can be short in burr height (H0), the thickness at burr root is wide. Often this material is more a part of the parent metal than the burr. These burrs will not be good candidates for the sPINner as a very aggressive and abrasive action that has a high stock removal rate is required to remove these burrs.

Brittle Materials
Another factor to weigh in this process is the material itself. More brittle materials will tend to have the burr break away from the part (parent metal) making the sPINner a good option.

Softer Materials
Softer or more malleable material will tend to have the burr roll and flatten. Softer materials need to have a thinner thickness at root to be good candidates for the sPINner.

If you have a question regarding if the sPINner may work in a particular application, please contact Michael Harris or John Swann  Earth-Chain USA at 317-842-8934

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