Showing posts with label Mechanical. Show all posts
Showing posts with label Mechanical. Show all posts

27 March, 2015

Repairing an old Mitutoyo profilometer probe


Some time ago I repaired an old Mitutoyo profilometer 178-928D , which no longer has spares and which had broken the pin that transmits motion to the head holder; a calibrated shaft that moves left and right and which I hold in the following image (the pin / screw was in the center hole):


This probe has a very simple operation. The spindle that is coupled detects changes in a very similar way that is translated the marks in an old LP music disk, transmiting the movements caused by the roughness by a magnet and coil needle.
The shaft that moves the spindle is moved in a controlled manner with a step by step motor to an endless spindle, first the engine slowly forward in the measurement phase, and then quickly picking head to its starting position, all controlled from the profilometer which is connected with a cable with 6 wires (that is a seven or eight cable, but one or two are not used, as you can see in the following images after repairing the cable too):

30 October, 2014

How to weld aluminum and other nonferrous alloys easily with Durafix


Thank Durafix a zinc-based alloy and other materials, have managed to repair a bike aluminum BH we had forgotten in the attic for having a broken rear frame. 



Welding aluminum is very complicated, or at least it was until I tried to use Durafix; No welding aluminum and I can stand. The welds are stronger than aluminum itself, and instead the material melts before I do the base (aluminum) material, so that we can "work it" with some tool. 
Moreover it serves to weld many types of materials, such as brass, bronze, copper, non-ferrous etc.