Threaded hole depth changes - bug?

[bshbsh]

Hello all,

I have this problem since we moved from IV2014 to IV2017.4:

1. Edit existing threaded hole: ISO M8, hole 15 deep, thread 12 deep:

2. "Change" the thread - to itself:

3. The hole depth value immediately changes to the thread depth value!

4. When I click into the dialog field, it changes back to 15mm:

5. However after clicking OK and then re-checking, the depth is still 12mm:

Is this a bug?

[Anonymous]

Hello,

I don't think its a bug. Because we are using Invenor 2014 & 2016 Professional. And I tried doing this bolt size in my part. But it seems ok for me. There are no changes in the length when I reselect the bolt size. You might close the assembly restart your pc and then try. Or see if there are any unresolved features in the part. If yes, then try solving the features first and then try.

Thanks,

[pasi.annila]

Yes I have seen depth values changing when changing thread data. I think it's a bug. It was present on I2015 and also on I2017 - before that I didn't see that happened.

[johnsonshiue]

Hi! I could be wrong but I think this has something to do with the depth being on the Thread table. In the past, hole depth can be assigned to any value. We were criticized by our customers saying the threaded hole depth was arbitrary and it does not comply with the standards. Instead, it should be persistent and should be based on the standard.

The behavior you are describing is the result of the change to including depth on Thread table.

Many thanks!

[WHolzwarth]

Hmm. Two notes:

- bshbsh seems to be using an extended Thread.xls, very common here in Germany.

- The hole in the sample seems to be done initially in an earlier version.

Is this correct?

[bshbsh]

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@WHolzwarth wrote:

Hmm. Two notes:

- bshbsh seems to be using an extended Thread.xls, very common here in Germany.

- The hole in the sample seems to be done initially in an earlier version.

Is this correct?

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I'm using the german build, yes. I'm using the threads.xls that came with it. Only modified the custom thread descriptions for normal pitch threads to omit the pitch, that's all. I didn't "extend" the Threads.xls, whatever that means.

And yes, that particular example was made in IV2014. Just tried it on a new hole, by changing M8 to M8 it changes the depth values to data from the xls. (It shouldn't do that IMHO.)

[WHolzwarth]

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johnsonshiue schrieb:

Hi! I could be wrong but I think this has something to do with the depth being on the Thread table. In the past, hole depth can be assigned to any value. We were criticized by our customers saying the threaded hole depth was arbitrary and it does not comply with the standards. Instead, it should be persistent and should be based on the standard.

The behavior you are describing is the result of the change to including depth on Thread table.

---

I'm not pleased with the actual situation. Let's look at a sample:

Placing a standard M8 threaded hole, Inventor sets up a thread depth of 16 mm (= 2x thread size) and hole depth of 22.2 mm (Thread depth + 6.2 mm thread runout). These 6.2 mm are standard runouts for M8.

Now if the thread depth is changed to 20 mm, hole depth - as it is now after taking back a better solution - stays at 22.2 mm. That's not good in most cases, it should have been adapted to 26.2 mm.

I know, that some customers complained about this change, but in my eyes they are are minority. Most people would prefer automatic change.

So, what can be done?

Give us a checkbox for selection of automatic runout change. This can be hooked on or off, following the user's taste.

I don't think that another option is needed for not changing already existing holes. Normally they don't change, but it happens with editing an existing hole.