Woodworking Techniques and Advice
In previous issues, we have addressed the following questions:
Table A allows you to compare abrasive belt mineral sizes based on several different grading systems. Please note that the P-designated belts (European grades) are a different mineral size than the X-designated belts (U.S. grades] except for 180 grit.
My first two articles provided depth of scratch and material removal information. Based on the depth of scratch, material removal data and the machine that you have, you can now determine what grit sequence should be used.
The biggest operating problem that I witnessed during countless plant visits was the use of excessive feed speeds. This resulted in abrasive belt loading, burning, streaking and shortened belt life, along with poor sanding quality. There were no guidelines provided by abrasive belt or machinery manufacturers.
During the last decade, I have analyzed the sanding systems of more than 400 different companies that involved more than 1,000 wide belt sanders. I soon became aware of a distinct pattern of operating problems irrespective of the product being manufactured or the size of the company. The following are universal problems that you should endeavor to avoid.
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