I created a block with an M12x1.75 tap and created a bolt M12x1.75 die cut. Printed at .1mm layers on a Makerbot but the bolt does not fit the tap. Using the creation features how do I easily make bolts that fit? Thank you.
I would guess your printer settings need to be adjusted.
I'm still suffering anxiety from creating taps and dies pre-2016. Uhg! What a nightmare. So is my thinking is correct, when I create a tap and die (2016) they should fit? Thank you.
Rebecca, also remember that plastic shrinks quite a bit during cooling. It's entirely possible that your female threaded hole shrunk. Also if you don't have enough STL segments in the threads to make a true circle then then you could have binding problems as well. Last item to consider is that depending on nozzle diameter & layer size, if the Makerbot is driving the nozzle to the edge of the part, and not offseting to compensate for non-zero extrusion thickness, then you will have added nozzle diameter/2 of material to the threads.
3D printers tend to make "swollen" geometry, that is, the boundaries tend to have extra material. Most folks would not model and print threads of the small size you mention. They either print the pilot hole and tap it, or just drill and tap, or drill and glue in a threaded insert. You might be able to chase the threads with a tap, but it needs to be done very carefully and only with a very sharp tap (or die for the male threads).
We do the same ... print tap drill size hole and cut the threads manually, or print a hole sized for a threaded insert.
What materials are you using?
ABS on an FDM printer
You are also using the Makerbot. Even though you are using .1mm layers, the tolerance is about +/- 600 mm or so (obviously an exaggeration, but the point is that the Makerbot was designed to create toys and things to look at....NOT things to use [from my experience]).
3D printing, fasteners wow!!! Would it not be cheaper to buy some screws from the hardware store? There are some very good self taping screws that you can get that will hold your parts together to not have to print and then thread and tap holes in your parts after they are made or add a machining process to them.
I need to explain further my purpose for wanting the tap/die project to succeed. Success for my students is my job. I am a two-year program instructor - new to 3D printing. It is my objective to teach my students to use the 3D modelling software to produce mechanical parts and pieces which will actually assemble and work when 3D printed, even though the material (PBS/PLA) has limited parameters. My 'nut/block and bolt' exercise were successful using Solidworks pre-2016 when we had to manually calculate and create these parts. I know if I create larger 'toy-sized' bolts they will print and work. However, I will endeavour to produce smaller common sizes on our Stratasys Mojo 3D printer which has micro-accuracy capabilities.
The information you all have provided on this forum is fantastic! Actual production vs educational environment can be different. Perhaps, I need to rethink my course objectives. My goal is to make my students entry-level work force ready.
Rather than click an easy button - to have a thread... ...I think there is definite value in having the students set up the parameters of sweeping a tool along helix to get the thread. In the process they learn the thread nomenclature, cutting profile and you can use it as an exercise in considering tolerancing for manufacture. In the real world we cannot manufacture perfect parts. Because the 3D printing process is less-than-perfect you can have them include clearance values for the "cutting tool" to ensure that the parts will assembly after additive manufacture.
In a sense they are also getting exposure to a virtual introduction to subtractive manufacturing in setting up a cutting tool and allowing for manufacturing tolerances.
Easy button solutions do not teach very much, unless it is the student who devises the easy button.
You are SO correct. Could not agree more. In my endeavour to keep the students up-to-date with the great new features Solidworks continues to provide their users, it is imperative they are aware of the legacy methods of creating things like tap & die threaded parts. As a result of this conversation, I will be editing my lesson plan to include 'the old way' and 'the new way.'
That edit can include:
The old way works, the new way..........
What is the program that you teach in? Is there any training in use of tools, like a shop class?
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