Summary

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.

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

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CC BY