Using Hole Charts
Hole charts are space-delimited text files that contain fastener size diameter values. The hole charts enable you to standardize the available thread, diameter, countersink, and counterbore options when creating Standard hole features in your designs.
Hole chart files have the extension .hol. A hole chart takes its name from the THREAD_NAME parameter value that is used in the file. If the THREAD_NAME value is absent, the THREAD_SERIES value is used as the name. The names of the hole charts that are loaded must be unique.
Industry-standard hole charts (UNC, UNF, and ISO) are supplied with Creo in the load point. These charts must not be changed.
You can create custom hole charts to meet your specific design needs. Use the HOLE_PARAMETER_FILE_PATH configuration option to specify the directory for your customized hole charts.
Hole charts are loaded from multiple directories. The search order for the hole chart directory is the following: the directory mentioned in the HOLE_PARAMETER_FILE_PATH configuration option, the current Creo running directory, and the system-loaded hole chart directory. Therefore, the local directories have a higher priority than the system-loaded hole chart directory. Available hole charts, which include the hole charts found in all the above directories, are listed in the thread type box on the Hole tab.
Hole charts have two main portions, TABLE_DATA and THREAD_DATA.
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TABLE_DATA
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PROE_VERSION
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The release for which the hole chart was created (for example, 2002).
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THREAD_NAME
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The name of the hole chart. This parameter can be used to create threads with multiple names that have the same THREAD_SERIES. If a name is not mentioned, then the THREAD_SERIES is used by default.
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THREAD_SERIES
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The type of hole standard used (for example, ISO, UNC, UNF, NPT, NPTF, ISO_7-1).
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THREAD_TYPE
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The type of thread. It should include one of the following options: TAP, TAPERED, or TAPERED_ISO.
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THREAD_CLASS
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The tolerance class for the hole chart and a parameter that will be visible in the Thread Note (for example, 2b or H).
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TABLE_UNITS
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The measurement system for the hole chart; value is either inch or metric.
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DEPTH_RATIO
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The relationship between the thread depth and the drill depth (for example, 1.25). When you enter either the thread depth or the drill depth on the Hole tab, the other value is calculated automatically using this ratio. Drill Depth is Thread Depth multiplied by Depth Ratio.
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 You can override the default relationship of the depth ratio by entering both the Drill Depth and the Thread Depth values on the Hole tab, under the condition that the drill depth value is greater than or equal to the thread depth. |
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CALLOUT_FORMAT
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The format of thread notes created or shown in the model and drawing. This is not a place to add text to a note, but a place to define the way that the text of a note appears.
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THREAD_DATA (hole parameter values)
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Any column you define is considered a hole parameter. The parameter name and value are stored and displayed in the Parameters table on the Properties tab on the Hole tab.
Each row requires a value in each column. If a value requires spaces, fill the space with a dash. For example, format the screw size 1.125 inch (1 and 1/8 inch) as 1-1/8.
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FASTENER_ID
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Displays in the Screw Size list on the Hole tab.
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BASIC_DIAM
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The fastener diameter.
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THREAD
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Threads per inch, or pitch (if metric).
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TAP_DR
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Letter, fraction, number, or metric drill standard size.
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TAP_DEC
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Decimal size in inch or metric of the tap drill. This value appears in the diameter list box in the Dimension area on the Hole tab. (See Note below.)
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PERCENT_THREAD
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Ratio describing the actual engagement of fastener threads.
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CLEAR_DR_CLOSE
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Clearance drill, for close clearances.
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CLOSE_DEC
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Decimal size in inch or metric of the close clearance drill. This value appears in the diameter list box in the Dimension area on the Hole tab. (See Note below.)
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CLEAR_DR_FREE
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Clearance drill for free clearances.
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FREE_DEC
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Decimal size in inch or metric of the free clearance drill. This value appears in the diameter list box in the Dimension area on the Hole tab. (See Note below.)
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CLEAR_DR_MED
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Clearance drill, for medium clearances.
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MEDIUM_DEC
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Decimal size in metric of the medium clearance drill. This value appears in the diameter list box in the Dimension area on the Hole tab. (See Note below.)
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CBOREDIAM
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Counterbore diameter.
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CBOREDEPTH
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Counterbore depth.
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CSINKDIAM
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Countersink diameter.
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CSINKANGLE
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Countersink angle.
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BOTCSINKDIAM
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Bottom countersink diameter.
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BOTCSINKANGLE
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Bottom countersink angle.
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• For the TAP_DEC, CLOSE_DEC, MEDIUM_DEC, and FREE_DEC values, you cannot edit the value on the Hole tab unless the HOLE_DIAMETER_OVERRIDE configuration option is set to yes (the default is no). To prevent overrides of the system setting, include the HOLE_DIAMETER_OVERRIDE configuration option in a config.pro file.
• You can add columns for custom parameters, with the required values in the respective rows. Add the columns at the end of the standard columns that are provided.
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THREAD_DATA (for tapered hole)
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Industry-standard tapered hole charts (ISO_7/1, NPT, and NFT) are supplied with Creo in the load point, however these charts must not be changed.
You can create custom hole charts to meet your specific design needs. You need to add the following parameter names as columns in the THREAD_DATA table of tapered hole file:
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FASTENER_ID
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Displays in the Screw Size list on the Hole tab.
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BASIC_DIAM
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The fastener diameter.
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PIPE_OD
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The outside diameter of a pipe.
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THREAD
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Threads per inch, or pitch (if metric).
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PITCH
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• For ISO standard threads, the distance between threads.
• For other threads, the number of threads per inch.
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TAP_DR
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Letter, fraction, number, or metric drill standard size.
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TAP_DEC
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Decimal size in inch or metric of the tap drill. This value appears in the diameter list box in the Dimension area on the Hole tab. (See Note below.)
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PERCENT_THREAD
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Ratio describing the actual engagement of fastener threads.
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CBOREDIAM
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Counterbore diameter.
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CBOREDEPTH
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Counterbore depth.
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CSINKDIAM
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Countersink diameter.
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CSINKANGLE
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Countersink angle.
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THREAD_LENGTH
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The length of the threaded part of the hole or fastener.
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HANDTIGHT_LENGTH
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The distance that a pipe thread can be screwed into a fitting by hand before it jams.
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WRENCHING_LENGTH
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The distance that a pipe thread can be screwed into a fitting using a wrench before it jams.
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DEF_HOLE_DEPTH
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User-defined thread depth.
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MAJOR_DIAM_START
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The diameter of the largest part of a thread across the top of the thread.
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PITCH_DIAM_START
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The top of a cylinder along the threading whose diameter is half the distance between the crest and the root of the threading.
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MINOR_DIAM_START
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The diameter of the smallest part of a thread across the top of the thread.
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MAJOR_DIAM_END
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The diameter of the largest part of a thread across the bottom of the thread.
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PITCH_DIAM_END
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The bottom of a cylinder along the threading whose diameter is half the distance between the crest and the root of the threading.
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MINOR_DIAM_END
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The diameter of the smallest part of a thread across the bottom of the thread.
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THREAD_HEIGHT
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The distance between the minor and major thread diameters measured along the radius.
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THREAD_ANGLE
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The angle between the sides of a screw thread, measured in an axial plane.
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TAPER_ANGLE
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The angle between the smaller and larger diameter along the length of a taper.
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WASHOUT_ANGLE
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The angle between the surface at the point that threading begins, and the thread root at the point at which the threading achieves its full depth, over the length of the washout thread.
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TOOTH_RADIUS
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The radius of the rounding at the thread crest (at the tip of each tooth) or thread root (between teeth).
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