Circular Scale

prusaprinters

<p>This is a simple round threaded indicator, numbered 0 to 9. I used it when I was testing how repeatable a TTP223 capacitive switch was. It divides the thread pitch of 1/32 inches into 10 so that the linear movement was 1/320 inches (almost 0.08mm) for every graduation.</p> <p>The thread is 8-32 because that was the long screw I had on hand, with PLA it was very tight, it might be better to scale it up a few %. I just sized the thread with a tap after it was printed.</p> <p>Depending on which way you put it into the screw it will count up or down as you turn the screw.</p> <p>My filament was white and the markings are hard to see, I painted over it with a permanent marker and then rubbed it off with isopropyl alcohol to improve the visibility.</p> <p>I printed with the writing upright so the spreading out on the bed didn't affect the marking too much.</p> <h3>Print Settings</h3> <p><strong>Printer Brand:</strong></p> <p>Creality</p> <p class="detail-setting printer"><strong>Printer: </strong> <div><p>Ender 3</p></div> <p><strong>Rafts:</strong></p> <p>Doesn't Matter</p> <p class="detail-setting supports"><strong>Supports: </strong> <div><p>No</p></div> <p><strong>Resolution:</strong></p> <p>0.2</p> <p class="detail-setting infill"><strong>Infill: </strong> <div><p>50%</p></div> <p><strong>Filament:</strong> Unknown PLA White</p> <p><br/> <p class="detail-setting notes"><strong>Notes: </strong></p> </p><div><p>3G of PLA filament, 23 minutes according to Cura</p></div> Post-Printing ============= <p><strong>Improve readability</strong></p> <div><p>Painted with black marker and cleaned it off with IPA, this showed up the markings better</p></div> <p class="detail-image"><img src="https://cdn.thingiverse.com/assets/47/ef/9e/20/29/IMG_0262.jpg"/></p> <p class="detail-caption"><strong>Test setup, using Lego of course. Very flexible accurate and repeatable</strong></p> How I Designed This =================== <p><strong>Design steps</strong></p> <div><p>Fusion360, use sheet metal design and make a ring. Flatten it out and add markings. Reform into a ring and add centre cylinder with the threaded hole. </p> Fusion now allows you to emboss circular shapes without the fancy gymnastics used here <p><strong>Unfolded ring with markings</strong></p> <p><strong>Refolded</strong></p> <p><strong>Fill the centre and thread ahole</strong></p> <p><strong>What I should have used, on the right</strong></p> </div></p></p></p> Category: Parts