Woodworking Techniques and Advice

Tolerance threshold vital for wide belt sanders

Written by Howard Grivna Monday, 15 October 2012 00:00

howard-grivnaThere are several factors that affect a wide belt sander’s ability to hold a close thickness tolerance. When a sander is new, with proper operating procedures, any rigid orifice-type machine should reasonably hold plus or minus .005” tolerance. If a machine has been specifically designed and has the right characteristics to hold a close tolerance, thickness tolerances of plus or minus .0025” are achievable. However, within a short period of time (less than one year), certain wear factors require machine maintenance procedures along with proper operating procedures in order to continue to obtain tight thickness tolerances.

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Adjustment of wide belt sander can be tricky

Written by Howard Grivna Monday, 17 September 2012 00:00

howard-grivnaIn previous issues, we have addressed the following questions:

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Sanded finish should always be consistent

Written by Howard Grivna Monday, 20 August 2012 00:00

howard-grivnaTable 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.

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Time for the nitty-gritty of grit sequence

Written by Howard Grivna Monday, 16 July 2012 00:00

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.

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Sanding quality requires a slower approach

Written by Howard Grivna Monday, 18 June 2012 00:00

howard-grivnaThe 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.

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