{"id":19177,"date":"2023-10-23T06:00:58","date_gmt":"2023-10-23T06:00:58","guid":{"rendered":"https:\/\/dev.guehring.com\/so-gelingen-querbohrungen\/"},"modified":"2026-04-22T14:06:23","modified_gmt":"2026-04-22T14:06:23","slug":"cross-holes-not-a-problem-with-the-right-deep-drilling-strategy","status":"publish","type":"post","link":"https:\/\/guehring.com\/de-en\/cross-holes-not-a-problem-with-the-right-deep-drilling-strategy\/","title":{"rendered":"This strategy ensures successful cross drilling"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”4.23.1″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_row module_class=”gue-row-text” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.23.1″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n

Complex deep hole drilling <\/span>
\nThis strategy enables cross hole with the deep hole drill<\/span><\/h1>\n

Deep drilling is frequently used in mould making as well as numerous other sectors. However, the design and engineering side often requires the two holes to cross. Intersecting deep holes like this cannot be avoided, but their machining is tricky: That\u2019s because the moment that the deep hole drill exits one hole and enters the next, it crosses a gap, which interrupts the cooling process and can sometimes result in a very unfavourable spot drilling or guidance situation. The coolant is no longer capable of flushing out the chips properly, which may damage the tool. The guidance of the tool is also interrupted, which means that the stability of the tool is no longer guaranteed. Gaps like this can only be bridged reliably with the right strategy and the right tool.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”3_4,1_4″ module_class=”gue-page-header” _builder_version=”4.23.1″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_column type=”3_4″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/guehring.com\/wp-content\/uploads\/2025\/09\/Blog_Headergrafik_Juli_2023_Querbohrungen.jpg” alt=”Querbohrungen” title_text=”Querbohrungen” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

How to approach gaps<\/h2>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”3_5,2_5″ module_class=”gue-row-vertical-aligned-content gue-row-2col-image-text” _builder_version=”4.21.0″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_column type=”3_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/guehring.com\/wp-content\/uploads\/2025\/09\/Bauteil-1.jpg” alt=”Bauteil” title_text=”Bauteil” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][et_pb_text module_class=”gue-caption” _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]Component provided by Tebis AG[\/et_pb_text][\/et_pb_column][et_pb_column type=”2_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”Text” _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]Using a practical example, we explain the right way to approach cross holes: A large number of deep holes have to be drilled into a steel form insert (1.2321). These will later serve as coolant gallery holes through which a coolant can flow, for example, in order to control the temperature of the insert. These holes are drilled on a horizontal DMG machining centre; programming was performed using Tebis. However, cross holes and the resulting gaps make machining particularly challenging. Here we differentiate between two drilling situations in which a particular approach has proven successful.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

Two holes meet at a 90\u00b0 angle<\/h3>\n

Not every cross hole is problematic: If two holes meet at a 90\u00b0 angle, machining usually runs smoothly. In cases like this, a certain approach has proven to be effective, which we will outline using the following example.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n

Deep hole drilling of a cross hole as a blind hole in steel<\/h4>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”3_5,2_5″ module_class=”gue-row-vertical-aligned-content gue-row-2col-image-text” _builder_version=”4.21.0″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_column type=”3_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/guehring.com\/wp-content\/uploads\/2026\/01\/Grafik_Querbohrungen_EN.jpg” alt=”Prozess Tieflochbohren” title_text=”Prozess Tieflochbohren” _builder_version=”4.27.5″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column type=”2_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

    \n
  1. We enter the pilot hole in a counterclockwise direction with a reduced feed rate of 30 mm\/min and a speed of 500 rpm. The tool is guided by threading it through the pilot hole at a depth of 12 mm.<\/li>\n
  2. Once the drill is in the hole, the feed rate is raised to 60 mm\/min and this increased feed rate is used to drill up to the cross hole.<\/li>\n
  3. We enter the cross hole at the same high feed rate and only when we enter the second hole again do we decrease the feed rate by half from 60 to 30 mm\/min.<\/li>\n
  4. After threading into the second hole, we raise the feed rate back to 60 mm\/min and drill the hole at this high feed rate.<\/li>\n<\/ol>\n

    [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.21.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.21.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Tool<\/th>\nSingle-fluted gun drill EB 80, \u00d8 8 mm<\/th>\n<\/tr>\n<\/thead>\n
    Component<\/td>\nForm insert<\/td>\n<\/tr>\n
    Material<\/td>\nSteel (1.2321)<\/td>\n<\/tr>\n
    Cutting speed<\/td>\nVc<\/sub> = 50 m\/min<\/td>\n<\/tr>\n
    Rotational speed<\/td>\nn = 1990 rpm<\/td>\n<\/tr>\n
    Feed rate<\/td>\nVf<\/sub> = 60 mm\/min<\/td>\n<\/tr>\n
    Drilling depth<\/td>\nap<\/sub> = 320 mm<\/td>\n<\/tr>\n
    Expected tool life<\/td>\n10 m\/175 min = 32 components<\/td>\n<\/tr>\n
    Total drilling time<\/td>\n332 sec<\/td>\n<\/tr>\n
    Metal removal rate<\/td>\n3cm\u00b3\/min<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

    Two holes create a critical gap<\/h3>\n

    Things become more difficult if the intersection between the holes deviates from this 90\u00b0 angle (see bottom cross hole in the image). Problems arise even if a small hole meets a larger hole (see top cross hole in the image).[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”3_5,2_5″ module_class=”gue-row-vertical-aligned-content gue-row-2col-image-text” _builder_version=”4.21.0″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_column type=”3_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/guehring.com\/wp-content\/uploads\/2025\/09\/Querbohrungen3.png” alt=”Komplizierte Querbohrungen” title_text=”Komplizierte Querbohrungen” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”2_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]G\u00fchring has developed a special drill head for the EB 80 for applications just like this: This solid carbide drill head has the conventional tapered contour on the cutting part, but is almost twice as long thanks to a straight guide part. This guide part stabilises the tool when it enters the cross hole and ensures that the drill tip spots securely when it enters the material and is not pushed away too much to one side. Another advantage of the guide part is the better hole course. The usual curve values of 0.1 mm\/100 mm can be as much as halved thanks to the guide part.[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

    5 rules for creating perfect cross holes<\/h2>\n

    [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”3_5,2_5″ module_class=”gue-row-vertical-aligned-content gue-row-2col-image-text” _builder_version=”4.21.0″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_column type=”3_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/guehring.com\/wp-content\/uploads\/2025\/09\/GUE_EB80_stehend_web-rotated-1-scaled.jpg” alt=”EB 80″ title_text=”EB 80″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”2_5″ _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n