position the operator extends mast raising cylinder 20 which causes the mast to rotate about pivot shaft 11 from a horizontal to a vertical position as the mast raises strut 30 rotates about strut pin 36 and shoe pivot 33 as the slider shoe 32 slides along track 31 towards the mast base 3 fig2 shows the mast in the fully deployed vertical position with the mast raising cylinder 20 fully extended and the strut 30 rotated from its prior horizontal position shown in ghost lines to its new vertical support position if vertical drilling is intended all of the hydraulic locking devices that is slide shoe lock 37 and leg lock 13 already engaged mast lock 14 are then engaged forming a four point support for the mast as can be appreciated the tower will now be supported at the point of mast lock 14 pivot shaft 11 cylinder pivot 21 and slider shoe 32 and the drill rig is ready for vertical drilling the drill string 40 is extended from the mast and rotated to produce the desired hole the point of entry to the ground is shown enclosed in dust shield 7 in order to control dust formed in typical pneumatic drilling should the driller determine that angle drilling is required the mast or tower may be tilted simply by unlocking telescopic leg lock 13 and slide shoe lock 37 by retracting mast raising cylinder 20 the mast will rotate now about first platform pivot 17 rather than pivot shaft 11 as shown in fig3 as the tower is tilted the slider shoe travels along track 31 by virtue of the geometry to a point higher on the tower thereby providing more stable.