|Project by wuddoc||posted 01-14-2009 06:35 PM||2309 views||4 times favorited||2 comments|
As we all know cutting coated abrasives quickly dulls either the scissors or knife. In my past life I had taught students to use a steel rule versus a wooden stick when tearing the coated abrasive sheet as you get a sharper edge. If the abrasive was a larger grit with a heavier backing then scribing a line on the paper side helped tear the sheet evenly. This I taught saved abrasives and eliminated rough edges that can scratch the surface you are sanding.
My wood buddy Rick and I have a wide variety of sanding tools that use flat sheets of coated abrasives and recently have become tired of quickly dulling box cutter blades. This was after measuring and marking the portion of the sheet we needed which took even more time as we had to measure the tool and then draw or scribe lines.
Years ago I was introduced to the idea of tearing sheets of coated abrasive with a hacksaw blade. Several attempts where tried in order to determine how fine a tooth blade was needed. Overall the 32 tooth hacksaw blade worked best for the sheets we were tearing.
We decided to design and fabricate a coated abrasive cutting fixture based on my experience with the 32 tooth hacksaw blade. After measuring all the sanding devices we had that used portions of flat coated sheet abrasives it was determined that a ruler along with the blade would be mounted on laminate. Laminate or hardboard (Masonite) allows the sheet to slide easily. The local cabinet shop always has plenty of sink cutouts which we find useful for a variety of items we fabricate. When attaching the hacksaw blade small flat washers where placed under the blade at each hole in the blade. This allows the coated sheet to slide under the blade.
Since neither of us can remember all the sizes for all the sanding tools and anytime a label is attached to a tool, it either falls off, or is worn off. Therefore we added the sizes needed onto the abrasive cutting fixture using a label maker. In the pictures the SS and LS are reminders of which way to place the sheet in the fixture. SS = short sides and naturally LS = long side.
Holes were bored and the unit now hangs on are sanding assembly cart.