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How about some clarification on the use of hard and soft sanding pads? Is there anything more to it than 'use soft on bark"? When does one use each?
TYIA
TYIA
The solution to the problem of rippling is sharp sandpaper.
Michael Mouse has got it right except he forgot to point out that sanding with soft discs or by hand can cut into "punky"spots, thereby creatlng depressions which are difficult or neary impossible to remove by sanding.
MM mentioned this a several months ago in another thread-a fact I was unaware of. Gretch
As to a softer pad having the potential to generate more heat than a firm pad, I haven't noticed it, and would think it would be the other way around. Higher speeds, both wood and sanding disc, while using more pressure will generate more heat. To prevent dips and round overs, you have to use a very light touch, and never let the disc stand in one place. You have to support the sander with your hands, rather than let it rest on the wood. For natural edge bowls, I will sand the even part with the lathe spinning, and for the natural part, I will turn the lathe off.
I agree with you. I prove it o'er and o'er again... daily. Speed and pressure causes heat. You get the pressure with a firm pad, and a lot less pressure with the soft pad, because you'll ruin it, applying too much pressure.I don't see how a rolling tire on an axle applies to an abrasive disc on a drill. For me it is more like starting a fire with a stick and a bow to make it rotate. You need the right combination of pressure and speed to generate the heat to produce an ember. You can press as hard as you want, and if you are not spinning fast enough, you won't get an ember. You can spin as fast as you want, and if you do not have enough pressure, you still will not get a coal.
The softer pad, unless you really bear down on it to the point where it is totally compressed against the firm disc/mandrill, will not generate as much pressure/heat as a firm pad with the same pressure.
robo hippy
I agree with you. I prove it o'er and o'er again... daily. Speed and pressure causes heat.
Perhaps you rushing to complete an urgent order? Speed over surface does not affect friction. Increase in the normal force (pressure) does. When you're trying to prevent or cure problems, take Physics over perception every time.
I'm not a big fan of physics, I guess I mostly can't wrap my brain around it.
Maybe when we spin the disk faster, we inadvertently push harder?
I'm not a big fan of physics, I guess I mostly can't wrap my brain around it.
Thank you, thank you, thank you, Steve-I am not alone!!!! Gretch