Figure 2.  Recordings of rotating speed and feed rate during a drilling test.
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Figure 3.  Recordings of thrust force and torque during a drilling test.
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Figure 4.  Examples of thrust force curves obtained in powder-forged materials, 
as a function of drilled depth.²
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Figure 5.  Unetched structure of 11L17 steel (Material S-1).
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Figure 6.  Typical etched structure of FC-0205 P/M steel (PM-1).
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Figure 7a.  Change in thrust force as a function of drilled depth for materials of Series A.
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Figure 7b.  Change in torque as a function of drilled depth for materials of Series A.
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Figure 8a.  Drilling chips obtained when drilling the first hole in material D-1
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Figure 8b.  Drilling chips obtained when drilling the first hole in material D-2.
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Figure 9a.  Change in thrust force as a function of drilled depth for materials of Series B.
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Figure 9b.  Change in torque as a function of drilled depth for materials of Series B.
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Figure 10.  Densified layer under the tool after drilling in the PM-1 material.
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Figure 11a.  Land wear developed after 80cm drilled depth on tools used for DI D-1.
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Figure 11b.  Land wear developed after 80cm drilled depth on tools used for gray iron G-1.
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Figure 12.  Land wear and buildup of debris on the cutting edge of the tool 
used for drilling in the 1045 steel (S-2) after 80cm drilled depth.
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Figure 13.  Drilling chips obtained in Material G-1 and S-2.
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13a.  G-1, 1st hole	13b.  G-1, 50th hole
13c.  S-2, 1st hole	13d.  S-2, 50th hole

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