![]() With the shaft diameter set to the “root diameter” of the thread and the other dimensions roughly matching the broken plastic bits, this emerged an hour later: Broom handle screw plug – as built ![]() Fortunately, it turned out to be unnecessary, but it’s there if you want it. The OpenSCAD source code has a commented-out section that removes a similar shape from the shaft between the raised thread, but that brought the rendering to its knees. Broom Handle Screw – thread model closeup The former obviously weren’t appropriate and the latter produced far too many facets, so I conjured up a simpler shape: 32 slightly overlapping cylinders per turn, sunk halfway in the shaft at their midpoint, and tilted at the thread’s helix angle. But, I didn’t know that at the time a simple half-cylinder 2.5 mm wide and 1.25 mm tall was a pretty close match to what I saw on the broken plastic part.Īlthough OpenSCAD’s MCAD library has some screw forms, they’re either machine screws with V threads or ball screws with spheres. I measured a 5.0 mm pitch (which should be 5.08 mm = 0.2 inch exactly) and a crest-to-root depth of 1.4 mm = 0.055 inch, which makes them look like 3/4-5 Stub Acme threads. For a 5 TPI thread = 0.2 inch pitch, that’s GP = 0.1 inch vs. Machinery’s Handbook has 13 pages of data for various Acme screw threads, making a distinction between General Purpose Acme threads and Stub Acme Threads: GP thread depth = 0.5 × pitch, Stub = 0.3 × pitch. Some after-the-fact search-fu revealed that the thread found on brooms and paint rollers is a 3/4-5 Acme. Instead, an hour or so of desk work produced this: Broom Handle Screw – solid model – overview My lathe has quick-change gears that can actually cut a 5 TPI thread, but that seems like a lot of work for such a crude fitting. It’s a cylindrical Thing tailor-made for (or, back in the day, by!) a lathe. A few minutes of Quality Shop Time sawed off the end of the handle and unscrewed the stub to produce this array of fragments: Broken broom handle thread We try to use the same method to pay you as you used to pay us.Somehow, we wound up with a broom handle and a broom head, the former missing a threaded stub that was firmly lodged in the latter. Returning a product doesn’t affect your other statutory rights as a consumer. Please check the dispatch confirmation to find out more about your statutory right of cancellation. You’ll receive the full price of the product and delivery, plus any costs for sending it to us. We’ll process it as soon as monstrously possible – definitely within 30 days of us emailing to confirm a refund. ![]() We’ll check the product upon receipt and email you regarding your refund. You will need to return the product with its original returns form. ![]() You don’t agree to a change in our terms and conditions or other policies, or you think the product is faulty. We might need to ask for compensation otherwise. Please look after the product when you have it! Do not burn it, eat it, sit on it, drown it, or in any way cause it harm. Please send this with the original returns form supplied with your order, emailing us at to let us know it is on the way. You’ll receive a full refund, including delivery charge, processed within 30 days of return of the unwanted goods. You decide within seven days the product isn’t for you.
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