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Stepped hole modeling

Question asked by Scott Moore on Jun 14, 2018
Latest reply on Jun 15, 2018 by Solid Air

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Here's a feature that I have seen modeled a few different ways, and I'm curious what the experts here suggest is the best practice for modeling it.

I'm talking about a pressure transducer seat (image captured from Terwin Instruments website):

Ideally, it would be great to set this up as a hole wizard feature, because except for the 0.626 diameter counterbore depth which will vary depending on the wall thickness of the part, the other dimensions are more or less constant and generally speaking do not vary from hole to hole.

Thanks!

Tony Tieuli Jun 15, 2018 9:49 AM

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Scott Moore wrote:

Unless I'm a complete idiot (and I'm not ruling that out) I would think that if I were to change the blind dimension of this portion of the hole (shown circled in this image), the other dimensions should remain constant - they are all blind dimensions.

After much experimenting and head scratching I've found that if I modify that section of the hole without the baseline I get results similar to yours.

If I modify the hole with the use baseline dimensions box checked the elements under that one don't update.

However, if I modify the dimension without the Use Baseline Dimensions box checked then, after I modify the dimension and it looks all funky, and before closing the Advanced Hole dialog, check the Use Baseline dimensions box it seems to update correctly.

Hope this helps!

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Solid Air Jun 14, 2018 11:40 AM
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If you are using SW2018, I recommend looking at Advanced Hole.
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Tony Tieuli Jun 14, 2018 11:49 AM
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Scott Moore wrote:

Here's a feature that I have seen modeled a few different ways, and I'm curious what the experts here suggest is the best practice for modeling it.

I'm talking about a pressure transducer seat (image captured from Terwin Instruments website):
Ideally, it would be great to set this up as a hole wizard feature, because except for the 0.626 diameter counterbore depth which will vary depending on the wall thickness of the part, the other dimensions are more or less constant and generally speaking do not vary from hole to hole.

Thanks!
As Solid Air says, Advanced hole is the way to go. You can set it up then save it as a favorite.
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- Scott Moore @ Tony Tieuli on Jun 14, 2018 5:40 PM
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  OK so I created an advanced hole, saved it as a favorite, and created a new part and placed the advanced hole. The only dimension I want to change on the new hole created from the favorite is the "35.9 (0.626) DIA C'BORE" depth shown in the picture in my original post. However, when I change this dimension, all kinds of screwy things happen. It gets even crazier if I change it to "Use baseline dimension"
  
  I must be doing something wrong...
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  - Solid Air @ Scott Moore on Jun 14, 2018 9:31 PM
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    Can you upload your models? I only played with advanced hole a little (tap with spot face, tap with counterbore on each end) on flat surfaces. So I would be interested to see how you modeled the hole.
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  - Tony Tieuli @ Scott Moore on Jun 15, 2018 6:53 AM
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    Scott Moore wrote:
    
    OK so I created an advanced hole, saved it as a favorite, and created a new part and placed the advanced hole. The only dimension I want to change on the new hole created from the favorite is the "35.9 (0.626) DIA C'BORE" depth shown in the picture in my original post. However, when I change this dimension, all kinds of screwy things happen. It gets even crazier if I change it to "Use baseline dimension"
    
    I must be doing something wrong...
    
    That is strange. I've never seen that.
    If you can upload your model I'll take a look and see if I can spot any problem.
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    - Scott Moore @ Tony Tieuli on Jun 15, 2018 8:40 AM
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      Unless I'm a complete idiot (and I'm not ruling that out) I would think that if I were to change the blind dimension of this portion of the hole (shown circled in this image), the other dimensions should remain constant - they are all blind dimensions.
      
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      TestBlock.SLDPRT.zip87.7 KB
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      - Tony Tieuli @ Scott Moore on Jun 15, 2018 9:49 AM
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        Scott Moore wrote:
        
        Unless I'm a complete idiot (and I'm not ruling that out) I would think that if I were to change the blind dimension of this portion of the hole (shown circled in this image), the other dimensions should remain constant - they are all blind dimensions.
        
        After much experimenting and head scratching I've found that if I modify that section of the hole without the baseline I get results similar to yours.
        
        If I modify the hole with the use baseline dimensions box checked the elements under that one don't update.
        However, if I modify the dimension without the Use Baseline Dimensions box checked then, after I modify the dimension and it looks all funky, and before closing the Advanced Hole dialog, check the Use Baseline dimensions box it seems to update correctly.
        
        Hope this helps!
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        Scott Moore @ Tony Tieuli on Jun 15, 2018 10:05 AM
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        That is truly strange that it works that way; advanced holes were new in 2017 so maybe there are a few kinks to work out with it yet.
        
        Thanks!
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        Tony Tieuli @ Scott Moore on Jun 15, 2018 10:09 AM
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        Scott Moore wrote:
        
        That is truly strange that it works that way; advanced holes were new in 2017 so maybe there are a few kinks to work out with it yet.
        
        Thanks!
        It is strange. It usually takes a while for Dassault to work the kinks out of almost everything. They do seem to eventually get it done though.
        You're welcome. Glad I could help.
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        Scott Moore @ Tony Tieuli on Jun 15, 2018 10:14 AM
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        And interestingly enough, I can't seem to edit the advanced hole using the same workflow after the advanced hole has been created. I think I will kick this over to my VAR to noodle with too...
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        Scott Moore @ Scott Moore on Jun 15, 2018 10:22 AM
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        Or maybe not... Baseline dimensions go off the reference surface it seems, and toggling this control on and off does not change the surface reference for each section of the advanced hole.
        
        What's more, the section that is designated as 1/2-20 UNF thread does not appear as a cosmetic thread feature in the model.
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        Steve Labonte @ Scott Moore on Jun 15, 2018 11:05 AM
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        Scott take at look at the sketch 5 for advanced hole this might be the problem
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        Scott Moore @ Steve Labonte on Jun 15, 2018 11:14 AM
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        Yes, I question why there is a question mark there also. Solidworks does not tell me anything is wrong with the feature, and the sketch can't be edited outside of the advanced hole wizard dialog box. How do I find out what the problem is so I can fix it?
        
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        Steve Labonte @ Scott Moore on Jun 15, 2018 11:29 AM
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        wasn't sure either it does say unsolvable, conflict
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        Solid Air @ Scott Moore on Jun 15, 2018 1:03 PM
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        The ? seems to be linked to the countersinks. I created an advanced hole using your values and had the same ? when I inserted it as a favorite. I then made the countersink diameter smaller than the hole above it and decreased its depth so there was a small flat area on both sides of the countersink and holes. Repeated for other two countersinks then saved it out as a favorite. Now when I use it as a favorite no ?. If I had to guess, I believe it is flagging it as zero length geometry even though there is no other error message. Looks like I am off to my VAR too.
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        Tony Tieuli @ Scott Moore on Jun 15, 2018 11:28 AM
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        Scott Moore wrote:
        
        Or maybe not... Baseline dimensions go off the reference surface it seems, and toggling this control on and off does not change the surface reference for each section of the advanced hole.
        
        What's more, the section that is designated as 1/2-20 UNF thread does not appear as a cosmetic thread feature in the model.
        I just saved your hole as a favorite on my system.
        I created a new part, started advanced hole, loaded the favorite I had just saved from your part, closed the advanced hole.
        Then I went back in and edited the advanced hole using the workflow I described above and everything updated fine.
        As to the cosmetic thread, you have to select Tap Drill Diameter with Cosmetic Thread under Custom sizing in the thread section of the hole. Your advanced hole was set to Tap Drill Diameter. You won't see the cosmetic thread while the Advanced Hole dialog is still active. You have to finish the command first.
        
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