Spoke tensiometer

thingiverse

# 3D printed spoke tensiometer 3D printed spoke tensiometer (or *tension meter* if you prefer) based on Jobst Brandt's and Filip Kralyevski's designs. This is a work in progress. ## Parts * Indicator: * Shahe digital indicator, 0-12.7mm range, 0.01mm resolution (https://www.aliexpress.com/item/32823445866.html) * Motion: * THK VRT 1055 cross-roller table (https://www.ebay.co.uk/itm/185530610857) * Fasteners: * M2x8 phillips countersunk screw x4 (https://www.aliexpress.com/item/32869347610.html) * M2.5x5 socket flanged button screw x1 (https://www.ebay.co.uk/itm/175312432319) * M2.6x6 phillips countersunk screw x4 (https://www.aliexpress.com/item/4001066920056.html) * M2.6x8 phillips countersunk screw x5 (https://www.aliexpress.com/item/4001066920056.html) * M3x16 socket cap head screw x4 * D6xL5xM5 shoulder screw x2 (https://www.aliexpress.com/item/1005004367176439.html) * M3xD5.0xL4.0 threaded inserts x4 (https://www.aliexpress.com/item/4000761483243.html) * M5xD8.0xL9.0 threaded inserts x2 (https://www.aliexpress.com/item/4000232990523.html) * Bearings: * 696 bearing (ID6xOD15xW5) x2 (https://simplybearings.co.uk/shop/p152950/Major-Branded-696ZZ-Metal-Shielded-Deep-Groove-Ball-Bearing-6x15x5mm/product_info.html) * Spring: * Yokomo R12-18RSS (https://www.ebay.co.uk/itm/225038344901) ## More on parts * Indicator: * Any dial or digital indicator with the same dimensions, or others with modifications to the printed parts * Spring: * the R12-18RSS dimensions are: * wire diameter: 1.2mm * outside diameter: 11.9mm * free length: 30.1mm * ends: Squared and ground * spring rate: approx 2N/mm * Other Yokomo springs with the same dimensions * R12-18RSS - soft * R12-18RSM - medium * R12-18RSH - hard * R12-18RSSH - super hard * Alternatively, any spring that fits e.g. Lee Spring * Fasteners: * The shoulder screws details are * shoulder diameter: 6mm * shoulder length: 5mm * thread: M5 * ultra-low head shoulder screws are an option from, for example: https://www.wdscomponents.com/en-gb/ultra-low-head-stainless-steel-shoulder-bolts-wds-887/c-526/p-47459/v-47478 and https://www.mcmaster.com/screws/shoulder-screws-4/system-of-measurement~metric/shoulder-length~5-mm/thread-size~m5/socket-head-profile~ultra-low/ * M2.6 screws for the cross-roller table: * McMaster-Carr has a few options https://www.mcmaster.com/screws/system-of-measurement~metric/thread-size~m2-6/ * M2.5 flanged screw: * a screw plus washer would do the same job ## Assembly * guide_pt2 is glued (superglue, epoxy etc) into guide_pt1 ## Link to Fusion 360 online viewer https://a360.co/3N3vXVd (download is off)