Machinist

[Lawrence London <lfljvenaura@gmail.com>]

Suggested improvements for the next generation of the dial/digital caliper
http://www.practicalmachinist.com/vb/general/suggested-improvements-next-generation-dial-digital-caliper-335223/

Suggested improvements for the next generation of the dial/digital caliper

Present day dial/digital calipers are accurate and reliable within their declared resolutions. I have several I use all the time; one at each machine and one at the computer for prototyping from existing parts. There has been little change in their features and functionality over the last 40 years since their first appearance in industry - then essentially an improved measuring system built into a traditional vernier caliper.

Dial/digital calipers of today have many features but cannot measure internal grooves, thread pitch diameters internal or external, function as gear tooth calipers, scribing tips, measure groove widths, reliably determine the axial location of un-shouldered internal features, etc.

It would be a simple matter to furnish a line of dial/digital calipers with sockets to accept quick-change measuring probes on two axes: one parallel to the external jaws and the other parallel to the spar. I'm thinking of the comprehensive sets of interchangeable anvils included with some brands of thread mikes as a starting point for concept formulation/elaboration. Ancillary components of the system would include a setting ring to zero the display for internal measurements, a quick means of offsetting the display for testing deviation, a built is thermometer, etc.

The goal is an inspection station in a box where one tool and attachments would replace a dozen or more measuring tools for on-machine spot-checks, features with relaxed tolerances, etc. A secondary goal would be to arrange the interface so shop made probes, extensions could be made of drill rod suitably shaped and hardened on the spot for otherwise difficult to access measurements

This would be a convenience tool capable of +./- 0.001" or so accuracy not to replace a final inspection suite of tooling.

Suggestions? Comment? Criticism?

This post was inspired by Robin Renzetti's YouTube series on modifying a digital caliper
for measuring face grooves.