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Hi I am new to the HUB and will be ordering parts shortly for a new product I am developing. It is a mechanism machined in steel with a sliding piston (with orings) that is threaded together with a 7/16" UNC box and pin and also 1.4" stub Acme box and pin.

Questiions:

  • Do threads print such that they can be screwed together in a full scale 3D print.
  • Do most people print the thead, or odify the model, remove the thread and make a sliding fit knowing that in the finished steel parts the the thread will work
  • Any advice on part clearance between a pisoton and a bore would also be useful. Typically in the finished parts the steel components would have what I call a 5,5,5 tolerance. e.g. Piston OD = 1.000 / 1.005, Bore ID = 1.010 / 1.015.
  • Knowing that the models are correct for steel do I need to modify the piston and bore models to provide a sliding fit?

Thanks in advance,

Thunderbird.

2 Likes
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Hey Thunderbird,

Sounds like an interesting project. I am not that familiar with printing mechanical parts, but is something I’ve seen done before. For an FDM type printer, it would have to be set to a very high resolution. A Form One+ or other resin printer sounds like it might be a better fit, atleast for the sections that require threading.

You can take a look at on their website, it has a tutorial discussing how to print threaded parts. Hope that gets you started in the right direction!

Alex

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I know @Christian_CAD has experience with these things. Maybe he can help out?

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I have been Machining you 30 years and 3D printing for 4 years the printer I am using has a +or-.004 finish If you model the thread right it will work. If you like contact me at 3dhubs.com/frankfort/hubs/jay, and message me, I am modeling some acme threads right now for a project I am making. Hole this can help you out. Thanks