Thread: Honing and pressure

Originally Posted by fuzzychops

Pressure is force per unit area. So, for a given force (as measured with a scale) the pressure will depend on the width of the bevel and the width of the hone. I have a razor with a 3mm wide bevel and my 2H2H is around 80 microns, so with the same force, the honing pressure on the 2H2H will be 3000/80 or 37.5 times higher. I have a 1 inch wide Coticule, so the for the same razor and same force, the pressure will be 3 times higher than for a 3 inch stone.

Forgive me for be dumb, but isn't there a difference between weight, force, and pressure? I only got 5 hours of sleep, didn't research, just asking an honest question -
The only example I can think to use is if I weigh myself whether I stand on both feet or just one I weigh the same - if I stand on one foot I'm directing more pressure to that foot, but I don't weigh anymore. I guess I'm saying I'm using a weight scale, the variable would be weight right? not force or pressure although I think we are looking at the weight as pressure....

I say lots of dumb thing's early in the morning - but this may be getting to Technical over thought? a little

Originally Posted by Trimmy72

Forgive me for be dumb, but isn't there a difference between weight, force, and pressure? I only got 5 hours of sleep, didn't research, just asking an honest question -
The only example I can think to use is if I weigh myself whether I stand on both feet or just one I weigh the same - if I stand on one foot I'm directing more pressure to that foot, but I don't weigh anymore. I guess I'm saying I'm using a weight scale, the variable would be weight right? not force or pressure although I think we are looking at the weight as pressure....

I say lots of dumb thing's early in the morning - but this may be getting to Technical over thought? a little

The scale measures force, which is equivalent to weight. There is often confusion between mass and weight - weight depends on gravity, so you weigh less on the moon, but your mass is constant. Outside of Physics class, mass and weight are usually used interchangeably.

You are correct about doubling the pressure by standing on one foot; the same force (your weight) spread over half the area (one foot instead of two). Same reason the pointy end of a pin will easily puncture your skin while the head will not (with the same force). Same reason a sharp blade will shave while a dull blade will not.

Originally Posted by fuzzychops

The scale measures force, which is equivalent to weight. There is often confusion between mass and weight - weight depends on gravity, so you weigh less on the moon, but your mass is constant. Outside of Physics class, mass and weight are usually used interchangeably.

You are correct about doubling the pressure by standing on one foot; the same force (your weight) spread over half the area (one foot instead of two). Same reason the pointy end of a pin will easily puncture your skin while the head will not (with the same force). Same reason a sharp blade will shave while a dull blade will not.

My plan is to place a hone & razor on a scale that measures the weight, and zero it out.

I think all we're looking for is a number, that someone could duplicate with a scale - just give them something to shoot for, I think if anyone else has a scale that can do this please do, I think the more people involved the better. I'm hoping to do a video this evening if not by the weekend, I hope you guys don't mind hearing cartoons in the background........

Originally Posted by Trimmy72

My plan is to place a hone & razor on a scale that measures the weight, and zero it out.

I think all we're looking for is a number, that someone could duplicate with a scale - just give them something to shoot for, I think if anyone else has a scale that can do this please do, I think the more people involved the better. I'm hoping to do a video this evening if not by the weekend, I hope you guys don't mind hearing cartoons in the background........

I expect that pressure is the key here, not simply force. I would suggest that you measure the bevel width of the razors you use for your experiment to allow comparison of pressure.

Does anyone else use more force for wider bevels and less for narrow bevels?