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Suppression of Default Pilot Holes for Threaded Holes
2

Suppression of Default Pilot Holes for Threaded Holes

Suppression of Default Pilot Holes for Threaded Holes

(OP)
Folks,
Generally speaking, the machinist knows best what pilot hole to use for a given thread size, thread depth, and thread material. That's why it's really stupid for PTC to add pilot hole call outs to all threaded holes. At what code revision did they start doing this? Does anyone know how to suppress the pilot hole call out from the model annotations and the drawing? Is there a config,pro setting or a way to edit *.hol files to do away with these?

Tunalover

RE: Suppression of Default Pilot Holes for Threaded Holes

Possibly in the *.hol files you can edit the Callout information text at the top of the file. There is a CS document on how to modify *.hol files, but I don't have it at my fingers.

"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

RE: Suppression of Default Pilot Holes for Threaded Holes

Pilot hole or minor diameter size? If it is the minor diameter, that's the engineer's responsibility, particularly if the thread will mate with rolled threads that have more stringent minor diameter requirements.

RE: Suppression of Default Pilot Holes for Threaded Holes

(OP)
3DDave,
Of course the pilot hole size.

Tunalover

RE: Suppression of Default Pilot Holes for Threaded Holes

I wonder what customer asked for that? I don't recall seeing any callout like that, ever. Hence my puzzlement.

RE: Suppression of Default Pilot Holes for Threaded Holes

(OP)
3DDave,
I'm not following you. All I'm saying is that, in order to get a No. 10 threaded hole .25 deep you just need to call out ".190-32 UNF-2B X .25 DP" and that's it. No pilot hole call out is necessary as the machinist will decide what to use based on the material type and other considerations. One size doesn't fit all so I believe it was a wrong move for PTC to include a pilot hole call out with all their threaded holes; it's unnecessary and ties the machinist's hands to using only one size. That's why I'd like to suppress that functionality.

Tunalover

RE: Suppression of Default Pilot Holes for Threaded Holes

As I said I have no idea why there would be a pilot hole called out on a tapped hole, though I do know the tap drill should probably be called out.

I looked at the Help and I don't see a pilot hole diameter parameter for Creo 3.0 http://help.ptc.com/creo_hc/creo30_pma_hc/usascii/...

Is this something someone in your company added?

RE: Suppression of Default Pilot Holes for Threaded Holes

(OP)
When I say "pilot hole" I mean tap drill.

Tunalover

RE: Suppression of Default Pilot Holes for Threaded Holes

(OP)
@3DDave-
I don't agree that the tap drill size should be called out. The tap drill is a process step that has nothing to do with the end-item so it doesn't belong on the drawing IMHO. That's why I want it removed from the threaded hole drawing annotations.


Tunalover

RE: Suppression of Default Pilot Holes for Threaded Holes

Tunalover,

What you are looking for is the *.hol files for each of the thread types that PTC has listed (the files are plain text, just named with a .hol extension). They are located in: <loadpoint>/text/hole for Wildfire and <loadpoint>/Common Files/<date code>/text/hole for Creo (unless you have a custom hole file location specified in your config.pro).

The thread notes started either in Wildfire 3 or 4 and have not changed since. If you have access to the Wildfire/Creo help files, there is a ton of customization information located there under <Creo Parametric>Part Modeling>Part Modeling>Engineering Features>Hole>Standard Holes>Using Hole Charts.

Not only is it possible to edit the default note, but it is also possible to define a unique note for every possible combination of options in the threaded hole panel. The tables, method, and parameters are the same regardless of version of WF/Creo.

This link should take you straight to the "Using Hole Charts" topic in the Help center for Creo 2.0 (PTC login requried).

RE: Suppression of Default Pilot Holes for Threaded Holes

Tap drill size sets the amount of thread engagement. For any particular size there are usually several drills that give different percentages of thread form; there are even recommendations that for precise control of thread form the holes be reamed prior to tapping.

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