5/16-18 Bolt And Nut
by gitrdun, published
4/11. I remade the threads to be a little closer to true machined thread dimensions. Its a little more acurate and i had no problem screwing the printed bolt and nut together.
I will try and make some more bolts and nuts with different sizes and maybe even some common metrics as i get time.
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You have not gotten the printed nut to fit on the printed bolt because you only used a 0.001 inch gap between the two. This would be correct if your consumer grade 3D printer can print something that exact. Every printer is different but the numbers on my Makerbot Replicator with 0.4 mm nozzle is that a gap is only a gap if it is at least 0.4 mm. Also, there is a 0.2 mm inaccuracy in the print, too. In other words, the print is 0.2 mm out of round. Since there is a gap on both sides, that would be 0.4 x 2 = 0.8 mm. Add to the total gap the inaccuracy and you get 0.2 + 0.8 mm = 1 mm. I made the difference between the nut's hole diameter and the bolt's thread diameter a 1 mm difference. The bolt screws on perfectly to the nut perfectly. My numbers may be different from your numbers. Your printer may be calibrated differently from my printer, so you'll have to get a digital caliper and perform some experiments. However, if your 3D printer has a 0.4 mm nozzle, then my numbers will be a great starting point for you.
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For the single thread files - The length of thread for an 18 pitch thread is .0555" , so copy translate the threads up or down by .0555" one thread at a time.
On the ID thread just stack however many threads needed on top of eachother to get the length of thread you want and then positive boolean it into a nut or whatever you want that has a hole the same diameter as the OD of the thread.
On the OD thread to make a bolt - Stack one thread on top of another to get the length of thread needed. Then create a bolt with the OD diameter about .001" smaller than the OD of the thread. Then subtract boolean the thread from the bolt to create the threads.
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