Recent content by dovidu

the post is becoming very off topic! so, nobody has clue? whether moh scale is logarithmic? what's the hardness difference between 7 vs 9 ? 100 times?? does anyone know wear resistance of osmium vs tungsten carbide on paper? it doesn't have to be exact

could be but not the slitting thickness of 0.05mm

unfortunately its impossible to make 0.05mm slit for such material... even carbide has to be done with diamond

i have already succeeded making such carbide point nib. the relevant question here is: low much longer would it last, compared to traditional iridosmium point nibs writing material is paper

Hello, everyone i always had this question in mind, and also tried to look for answers on the web, but alas! i can't seem to find definite answer! i am currently making a fountainpen nib with a carbide point. the traditional material for fountainpen tipping is iridium + osmium alloy...

nothing! i am just amused :D

quadruple... o_O

sir, it turns out this is way more complicated than i initially predicted the physics teacher i know said he couldn't figure it out, he had never encountered such problem ever in his life he just kept saying sorry... o_O i actually might do a real life test with small pieces but... would it just...

here's actual pictures of it currently under construction have many projects running at the same time so progress is a bit slow but slowly will be finished eventually i designed in such way so rigidity loss is miminum with minimal deflection low part grinding should be a breeze very tall...

for those wondering what my current project looks like here's the picture it's a small machine using 30x30x8(cm) granite surface plate a small but powerful variable speed grinder with vertical type stone will mounted on the Z axis diamond dresser to true up the stone i am expecting quite...

good work! thank you for your dedication! gradient dispersion of force from center to edge as expected if linear rails and reinforcement plates are installed, this could be quite a different story however the result you've shown gives me hope 4 ton pressure and 0.003mm displacement hm...

good cad design, if you created that just for this discussion i give a plus to you. good job! some things to note though, your design is inverted from what I've been talking abought throughout this thread (it really doesn't matter though) also, i don't consider 40x60x8 a small size for a...

thank you for your input. i currently have 3 surface plates in my room and when you looks and it and touch it, it really is a solid material can't imagine this thing breaking so eaily also 10cm versions are available, but cost and weight also increases i think if 8cm fails 10cm is a next...

actually, i realized the compression and tensile stress occurs "AT THE SAME TIME" this applies to all materials this you can realize by pure common sense and intuition/logicit's more like the two stresses occur at the same time. as the force increases the bottom side compresses to a point...

no sir, this is a precision granite surface plate. if you google this and look at this images you will see what i meant