This is the Mongoose, one of the most popular concrete engraving tools from Engrave-A-Crete.
In this video adjustments of the depth and the blade are demonstrated.
This is part 24 of an on-going series on Decorative Concrete, and is taken from the DVD Mastering Concrete Engraving, The Basics.
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With the Mongoose unplugged and upside down, view the alignment of the center of your blade in relation to the front and rear pointers using a combination square.
If an adjustment is necessary, loosen the jam nuts which hold the pointer sights and adjust accordingly. After making all adjustments, it is recommended that you verify that the blade is properly aligned.
The process is simple. Snap a chalk line. Aim the pointers at the chalk line. Roll the tool forward while keeping the pointers aligned over the chalk line.
Visually verify that the blade is centered on the chalk line.
As the Mongoose blade wears, you may have to adjust the plunger housing in order to engage the blade with the concrete.
If an adjustment is required, mark the current position of the housing. Slightly release the two screws, and slide the housing upward about one eighth of an inch. Re tighten the housing screws. Adjust the depth limiting screw to the desired depth of cut.
Check to see if the spring action works properly.
When downward pressure is released, be sure the blade completely disengages from the concrete. The blade should hover at least one quarter inch above the slab.
Purchase the DVD Mastering Concrete Engraving, The Basics to see this series in its entirety.