Rules of Golf 2012-2015 Pocket Edition - The R&A
Rules of Golf 2012-2015 Pocket Edition - The R&A Rules of Golf 2012-2015 Pocket Edition - The R&A
156 Appendix II b. Impact Area Roughness and Material Except for markings specified in the following paragraphs, the surface roughness within the area where impact is intended (the “impact area”) must not exceed that of decorative sandblasting, or of fine milling (see Fig. X). The whole of the impact area must be of the same material (exceptions may be made for clubheads made of wood). c. Impact Area Markings If a club has grooves and/or punch marks in the impact area they must meet the following specifications: (i) Grooves • Grooves must be straight and parallel. • Grooves must have a symmetrical cross-section and have sides which do not converge (see Fig. XI). Fig. XI ������� �������� Fig. X Illustrative impact area ������������ ������������ ������������ ������������ ��� ���������� ���������� ���������� �������������� • *For clubs that have a loft angle greater than or equal to 25 degrees, grooves must have a plain cross-section. • The width, spacing and cross-section of the grooves must be consistent throughout the impact area (some exceptions may be made for woods). • The width (W) of each groove must not exceed 0.035 inches (0.9 mm), using the 30 degree method of measurement on file with the R&A. ���
Appendix II 157 • The distance between edges of adjacent grooves (S) must not be less than three times the width of the grooves, and not less than 0.075 inches (1.905 mm). • The depth of each groove must not exceed 0.020 inches (0.508 mm). • *For clubs other than driving clubs, the cross-sectional area (A) of a groove divided by the groove pitch (W+S) must not exceed 0.0030 square inches per inch (0.0762 mm 2/mm) (see Fig. XII). Fig. XII • Grooves must not have sharp edges or raised lips. • *For clubs that have a loft angle greater than or equal to 25 degrees, groove edges must be substantially in the form of a round having an effective radius which is not less than 0.010 inches (0.254 mm) when measured as shown in Fig. XIII, and not greater than 0.020 inches (0.508 mm). Deviations in effective radius within 0.001 inches (0.0254 mm) are permissible. Fig. XIII A W + S < 0.0030in 2 / in 30° 30° �������� ������ ���������� �������������� (ii) Punch Marks • The maximum dimension of any punch mark must not exceed 0.075 inches (1.905 mm). • The distance between adjacent punch marks (or between punch marks and grooves) must not be less than 0.168 inches (4.27 mm), measured from centre to centre.
- Page 113 and 114: Rule 30 105 d. Penalty to Side A si
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156<br />
Appendix II<br />
b. Impact Area Roughness and Material<br />
Except for markings specified in the<br />
following paragraphs, the surface<br />
roughness within the area where impact<br />
is intended (the “impact area”) must not<br />
exceed that <strong>of</strong> decorative sandblasting,<br />
or <strong>of</strong> fine milling (see Fig. X).<br />
<strong>The</strong> whole <strong>of</strong> the impact area must<br />
be <strong>of</strong> the same material (exceptions<br />
may be made for clubheads made<br />
<strong>of</strong> wood).<br />
c. Impact Area Markings<br />
If a club has grooves and/or punch marks in the impact area they must meet<br />
the following specifications:<br />
(i) Grooves<br />
• Grooves must be straight and parallel.<br />
• Grooves must have a symmetrical cross-section and have sides which do<br />
not converge (see Fig. XI).<br />
Fig. XI<br />
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Fig. X<br />
Illustrative<br />
impact area<br />
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������������ ������������<br />
���<br />
���������� ����������<br />
���������� ��������������<br />
• *For clubs that have a l<strong>of</strong>t angle greater than or equal to 25 degrees,<br />
grooves must have a plain cross-section.<br />
• <strong>The</strong> width, spacing and cross-section <strong>of</strong> the grooves must be consistent<br />
throughout the impact area (some exceptions may be made for woods).<br />
• <strong>The</strong> width (W) <strong>of</strong> each groove must not exceed 0.035 inches (0.9 mm),<br />
using the 30 degree method <strong>of</strong> measurement on file with the R&A.<br />
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