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Dressing and Trueing Convolute Wheels

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Ask Tech - Dressing / Truing Convolute Wheels 

In our continuing effort to create a reference for our customers on troubleshooting information, below please find our problems for this issue. If you clip this section or just keep this page in a file, it will build a troubleshooting reference for your use in the future.  These check lists are good regardless of what type of material you are sanding, as they are problem oriented in regard to the abrasive/machinery as opposed to workpiece based.

Truing:  To make level, balanced or concentric; bring or restore to a desired mechanical accuracy or form.  To prevent vibration at high speeds, a diamond or other dressing tool is used to ensure that a non-woven grinding wheel is round and concentric.

Dressing:  Removal of undesirable materials from “loaded” non-woven grinding wheels to expose unused abrasive points.

 Both the above activities are limited to convolute wheels 6” in diameter and larger.

Truing or Dressing for non-woven/convolute wheels can be accomplished by either Powered Diamond Saw Blades, Coated Abrasive Materials or the use of Custom Metal Tools.  The best two options of these for end users will be either the Coated Abrasive Material or the Custom  Metal Tool. 

The Coated Abrasive Materials option requires inexpensive material with a little technique.  A piece of very coarse (24 or 36 grit) coated abrasive material and a heavy solid piece of metal is used.  The coated abrasive material is used because of the many cutting points it provides for truing.  The heavy piece of metal maintains contact between the non-woven wheel and the coated abrasive material.  If a heavy piece of metal is not used, the coated abrasive material will bounce on and off the non-woven wheel and the wheel will not be properly trued.  This method works best for the harder density non-woven wheels such as the convolute 9SF for deburring. 

The Custom Metal Tool option is the most unique method of all because some operators use many different variations of “truing tools” ranging from a bottle cap to a very elaborate two-handed rake-type tooth tool.  The tools are usually very thin to maintain a sharp edge, short, and have a right angle to reduce the change of snagging the tool with the wheel.  This method is best suited for the softer non-woven wheels .  The advantage of this method is the tool’s ability to quickly cut into the wheel by actually cutting the non-woven fibers.

Profiling, which is often inaccurately referred to as “dressing”, is basically putting a mirror image of the one to be sanded into the face of the sanding wheel.  This procedure is not recommended for convolute wheels.  There are specialty non-woven wheels made by companies like Bardo-Flex which are specifically designed in the weave to allow profiling. 

 


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