Cutting element attached to downhole fixed bladed bit at a positive rake angle

1. A fixed bladed bit for drilling underground into a formation, the fixed bladed bit comprising:

a shank;

a bit body attached to the shank, the bit body having a working surface that includes at least one blade for engaging the formation, the at least one blade extending away from the working surface;

at least one cutting element attached to the at least one blade, the cutting element including:

a superhard material that includes:

a central axis;

a side wall;

an apex at which the side wall intersects to form an included angle;

the side wall and the apex forming a substantially pointed geometry that in cross-section includes a diameter between a transition where a curvature of the apex tangentially meets the side wall, the curvature being bounded within the side wall; and,

a cemented metal carbide substrate bonded to the superhard material at a non-planar interface.

2. The fixed bladed bit of claim 1 , wherein the cutting element is positioned at a positive rake angle, where rake angle is defined as the angle formed between the central axis of the cutting element and a line parallel with a bit axis.

3. The fixed bladed bit of claim 2 , wherein the positive rake angle is between 5 degrees to 20 degrees.

4. The fixed bladed bit of claim 2 , wherein a leading portion of one of the first side wall and the second side wall is positioned at a negative rake angle.

5. The fixed bladed bit of claim 1 , wherein the cutting element is positioned on at least one of a flank and a gauge of the at least one blade.

6. The fixed bladed bit of claim 1 , where the included angle is between 75 degrees and 90 degrees.

7. The fixed bladed bit of claim 1 , wherein the superhard material is sintered polycrystalline diamond.

8. The fixed bladed bit of claim 7 , wherein the sintered polycrystalline diamond comprises a volume with less than 5 percent catalyst metal concentration and 95 percent of a plurality of interstices in the sintered polycrystalline diamond comprise a catalyst.

9. The fixed bladed bit of claim 1 , wherein the non-planar interface comprises an elevated flatted region that connects to a cylindrical portion of the cemented metal carbide substrate by a tapered section.

10. The fixed bladed bit of claim 1 , wherein the diameter is less than one-third of a diameter of the cemented metal carbide substrate.

11. The fixed bladed bit of claim 10 , wherein the diameter is less than one-quarter of the diameter of the cemented metal carbide substrate.

12. The fixed bladed bit of claim 1 , wherein the curvature is a radius of curvature.

13. The fixed bladed bit of claim 12 , wherein the radius of curvature is less than 0.120 inches.

14. The fixed bladed bit of claim 13 , wherein the radius of curvature is between 0.050 inches and 0.120 inches.

15. The fixed bladed bit of claim 1 , wherein the curvature is defined by a portion of at least one of an ellipse, a parabola, a hyperbola, a catenary, and a parametric spline.

16. The fixed bladed bit of claim 4 , wherein the positive rake angle is less than one-half the included angle.

17. The fixed bladed bit of claim 1 , wherein the non-planar interface includes at least one of notches and a spline curve profile.

18. The fixed bladed bit of claim 1 , wherein the side wall includes at least one of a linear tapered portion, a concave portion, and a convex portion.

19. The fixed bladed bit of claim 1 , wherein the superhard material comprises a height greater than a height of the cemented metal carbide substrate.

20. The fixed bladed bit of claim 1 , further comprising a plurality of blades extending away from the working surface of the bit body and an indenting member that extends a distance from the working surface of the bit body between the plurality of blades.