I have a background in cabinetry, but I am going to keep an open mind...couldn't you just start with a higher grit or am I missing something? Or Just work your way from one to the next? Why take the same grit and rubs them together to just essentially create a new grit?
@godhandtool23378 ай бұрын
That's a great question. Grit numbers indicate the size range for the abrasive grains. The higher the grit number, the smaller the grains, so you get a finer sanded surface. What this trick is intended for, is to remove the grains that stick out (and cause deep scratches) due to not being level with the other grains, so it does not change the size of the grains. So the grit number actually never changes, you still get the same abrasive power without leaving rougher scratches than intended. So it improves efficiency because #240 will take less strokes to remove the necessary amount of material than #600.
@brianhawthorne76038 ай бұрын
Always a good idea to “dress” off the 40 grit particles to turn your 40 grit to 80. If your sandpaper is leaving scratches, why not just start with a higher grit?
@godhandtool23378 ай бұрын
Again, higher grit indicates a smaller or finer range of grains. With the production methods involved in the making of the sandpaper, the grains that stick out can either be a grain that landed on another grain but still caught some glue to fix it in place, or it could be a huge grain that is an outlier for said grit (because production standards would require x% of grains to be within size range Y to Z). So by removing these type of grains, you still will have the grinding power of a 40 grit, without leaving the deeper marks.
@brianhawthorne76038 ай бұрын
@@godhandtool2337 Maybe it’s the quality of sandpaper I buy, but I have literally never had this problem, if I match the starting grit to the material and surface. With wood, I use 40 and 80 grit for shaping, not smoothing. Since I am trying to remove large amounts of wood, I am not concerned about any scratches as they will be removed later. For fine pieces, I sand with 120, 220, 300, 400, 500, 800, 1000, 1500, 2000, 3000, 4000, 5000, then polish.
@legendofnoob8 ай бұрын
@@brianhawthorne7603 With wood it probably is not a big deal. For plastic the scratches turn white and stands out a lot more.
@dolyharianto8 ай бұрын
Congrats you just turned your #240 into #260
@godhandtool23378 ай бұрын
See the grit number does not change because the sizes of the grains remain the same. You still have a #240, except the abrasives that stickout the most, which are few, got removed.