Surface Roughness

end mill finish with SX2.7 and bracket

At a microscopic scale, no surface appears perfectly smooth. Surface roughness is determined by calculating Ra and Rz. Ra = average surface roughness Rz = information for any pore, hole or surface deformities. These can be detrimental to strength. Ra averages all peaks and valleys of the roughness profile and then neutralizes the few outlying … Read more

Sanding Blocks

sandpaper wrapped and glued to wooden drum

An article about sanding blocks feels like nonsense until you realise just how useful they are. The cork block is the starting point and one of the must have items in any toolbox. The next video is my contribution to #tipblitz19 This idea can then be taken further. Here I’ve made a mandrel up out … Read more