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gcambiaghi14-Alexandrite
14-Alexandrite
September 20, 2021
Question

File .hol

  • September 20, 2021
  • 1 reply
  • 2612 views

Hello

 

I have many doubts about the .hol file that I cannot understand.
How is the depth of the thread or hole calculated?
In the .hol file, the depth of the drill or thread is not specified but the difference is calculated using DEPTH_RATIO, who defines the value?

Thanks

1 reply

C
Chris321-Topaz I
21-Topaz I
September 20, 2021

You do in the .hol file. As an example:

 

In particular you might want to change the DEPTH_RATIO to 2 (see below as an example)

 

TABLE_DATA
PRO_VERSION      24
THREAD_SERIES    TAP
CLASS            H
TABLE_UNITS      metric
DEPTH_RATIO      2.00
CALLOUT_FORMAT  &METRIC_SIZE x &THREAD_DEPTH[.0] DP /(&PATTERN_NO x)

 

http://support.ptc.com/help/creo/creo_pma/usascii/index.html#page/part_modeling/part_modeling/part_nine_sub/Using_Hole_Charts.html 

 

Another example:

https://community.ptc.com/t5/3D-Part-Assembly-Design/tapped-hole-parameters/td-p/294994 

G
gcambiaghi14-AlexandriteAuthor
14-Alexandrite
September 21, 2021

Thanks for the reply, but the change in DEPTH_RATIO is clear to me, it determines the depth of the drill based on the depth of the thread but where does the thread depth dimension come from? There is no entry in the file where it says 20.4,
I attach the image,

T
23-Emerald IV
TomU23-Emerald IV
23-Emerald IV
September 21, 2021

From https://www.ptc.com/en/support/article/CS99906:

 

  • The hard coded predefined rules are :
    • DRILL_DEPTH = 3 x DRILL_DIAMETER
    • THREAD_DEPTH = DRILL_DEPTH / DEPTH_RATIO
    • DRILL_DIAMETER and DEPTH_RATIO are 2 values available in the .hol file
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