Wedge Expander for stone-breaking, expanders, Pichot, stone splitter manual. Many are the names to call those three pieces of metal that allow us to break rock with ease. Composed of two tabs and a wedge, they can split a large bolus of several tons or break a small piece perfect accuracy with excess matrix. Operation is very rudimentary, ADVANTAGE little resistance offered by solid groove expansive forces to break the rock with ease. There are ...
too expensive, can be reused many times and no vibration, making them ideal for removing delicate crystal pieces. For these standard features that have been widely used by masons to remove decorative rocks such as marble and granite.
are classified according to their diameter, which determines its function. This classification can lead to misunderstandings and sometimes, the measure refers to the diameter the two tabs when they are together and in other states the optimal diameter (drill diameter) that work on a rock or granite Marmorea (rigid). In other matrices more plastic and less consitent the optimum diameter can vary.
Using an example may be clearer: Zubi-Ondo brand marketed as a selling expanders 25mm. In this case, 25mm diameter refer to the two tabs together, ie without the wedge inserted. If we make a hole with a 25mm masonry drill, the tabs (which together have the same diameter as the drill bit) will not enter or enter with difficulty. If we can make enter the space between tongue and tongue is absent, are totally stuck. Under these conditions the expander begin to work just enter the wedge. If the resistance at this level is low, it is likely that the rock breaks through the top part, making it impossible to completely split the stone parallel to the expander. In addition to breaking bad, it is also very likely that the tongue adjacent to the break twice. Other brands sell their expanders indicating the optimum diameter drill that works the expander, the expanders for other comnercializados 32mm brands. In this case, when measuring the two spoons together with a diameter less than 32 mm, leaving a gap between spoon and spoon a few millimeters. Thus, the wedge begins to exert force when we introduced several centimeters avoiding the problem described above. The situation is exacerbated when working on a wall because the expansion is not symmetrical and that the rock broken only by the side of the wall in contact with the atmosphere.
If we make the mistake of buying a diámtro expander which is equal to or higher than the bit, we can modify it to work. This is achieved with a small grinder for grinding and polishing discs.
is very important to ask your hardware dealer to whom wedges which is coprime to the best of work. In this way we will be spared unpleasant surprises when we get out of stones.
Expanders 20 mm (optimal bit)
rigid matrix (ophite / metabasites) breaks easily
Fran takes a 20mm drill cut a piece
Despite being a very hard rock, the drill bit 20
matrix quickly 
Zubi-Ondo toned down a 25mm to 23mm
Michelangelo measured with the caliper diameter
Expander Testing ground in a small bowl of cluster
Roughing 
Pulido
Bit 25mm shale drilling in the mining Santa Barbara (Arteal Tunnel)
The tabs are reluctant to enter, you can appreciate the curbatura the same result as explained above
Trying to knock in the tabs of a 25mm in Zubi-Ondo 25mm hole
shale plasticity absorbs the force of expansion work harder
little space between tongue and tongue, wedge breaks too high
Of Mice and Mr. Acorn solve the problem
Bolus matchmaker match. You can see the partial tear in the left side. if the bolus had no party, this type of break bend the left tab
celestite geode Detail
sds-max drill 32mm
feeding the poor Chinaman
Chinito bad bit of 25mm and
Fran placing expanders Zubi-Ondo 25mm (23mm rectified)
Fran tries to reduce the bolus after split in half
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