Help with modeling female threads

[disneytoy]

Greetings!

So, I have this car lighter powered tire pump. The end of the lighter plug has been broken for some time. It is a threaded part, And I though I may try designing and 3D printing the female thread to fix it.

Using the thread command, I've tried various settings but can't seem to get the thread that fits.

I have an Ender 3 printer and can print pretty accurately, at least down to 0.1mm.

I measure with my digital calipers:

DEPTH of Thread: 6.25mm or 0.25"

DIAMETER of MALE THREAD: 17mm  or 0.6675"

NUMBER of THREADS: 4

I've given both Metric and Imperial because this is an older device made in China and who knows which it was designed in.

So I'm modeling the thread inside a 17mm hole.

My results are too tight, and if I increase them I get too loose.

Any tips on how to measure the threads? I can't measure the inner part of the thread only the outer. I think this may be my problem.

Next big question. If I want a good fit I generally expand the size by 0.1mm. 

How would I do that with the female thread. Remember I'm only interested in printing the broken female thread.

Any advice would be appreciated.

Max

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[johnptc314159]

i dont know anything about 3d printing 🙂

it sounds like a 17mm x 1.5mm  metric thread.  not the most common size 😞

what thread size did you use in fusion ??  is there a 17x1.5  ??  you might have to add it 🙂

[g-andresen]

Hi,

You have to find out what pitch the thread has and then compare your measurements with thread tables. This way you can determine which type of thread (metric or imperial) and which size.
With the data you can then use Fusion to create both a nut and a corresponding bolt thread with the thread tool.

günther

[g-andresen]

Hi,

Simply create a threaded hole and select a metric thread M17 x 1.5 from the table.

Günther