Better Printed Calipers

A 3D printed set of calipers with locking, swap-able jaws, linear bearings, and easy calibration.
In the contest Measurement Devices
162
218
0
4445
updated December 5, 2022

Description

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READ BEFORE PRINTING!

You aren't allowed to sell files or prints of this model. If someone asks for you to print this model, it is allowed as long as they aren't selling them. Showcasing on a storefront is considered a violation.

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Why?

I wanted to make a pair of better printed calipers. I've looked at several caliper models, 

Problems with other calipers:
  1. Calipers weren't adjustable, meaning you had to reprint to change
  2. Accuracy depended on fine-tuned steps/mm
  3. No locking mechanism to hold measurements
  4. Backlash and wear of calipers

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Print Instructions:

  • Print all parts in the default orientation. If you have a MK3S or Mini use the provided 3MF files for proper orientation. (There is one exception, listed later)
  • Don't use Rafts. All but one part relies on a flat surface to function.
  • Use a Smooth/Satin PEI Sheet. Textured will simply not work, because it will make the measurement surface rough, so measurements are not repeatable.
  • Support-Free orientations are available. The Main Jaw part has small inbuilt supports, and the Sliding Scale and Adjustable Scale can be printed sideways. The supported orientation offers the maximum amount of strength, while sacrificing a minimum amount of quality. The Interchangeable Main Scale must be printed with support on the dovetailed end.
  • Print the tolerance calibrators first. These use a minimum of filament to fine-tune your linear bearings and interchangeable jaws. Both of the scales (linear bearings) should be printed with the first XY-compensation that passes freely through the holes. Print the second calibrator receiving end with the results of the first calibration. It should be a medium-tightness fit, with no perceptible play in the join. If you can't decide between two, use the tighter value
  • Printed parts should be clean of brims and supports. Use a small file to knock off brims from the insides of the jaws

How to use the calibrator:

Print the calibrator, and drop the ball bearing in on the large side (small side has chamfers on the ends)

Measure the distance the ball bearing is stuck from the small end. Each tick mark is .1mm on XY compensation, which will get you in the ballpark of where it needs to be on the bearings.
If you want super-accuracy, measure the distance from the end with calipers, and each mm is .05 mm in XY compensation.

If the bearing drops through freely, you are good to go.

For the Dovetail joints, print and adjust until fit is tight, but you are able to take it apart with moderate force.

Hardware: Copied from BOM.MD

x2 M3x5 Screws

x2 M3x5 Square nuts (Included with Prusa Spare parts)

x60 3/32" ball bearings (Bring Spares!)

 

 

 

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