52mm overhang gauge for replacable headshell
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This is a new take on the 52mm Technics overhang gauge for correct pickup alignment in a replaceable headshell
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Model information
- Source
- Printables
- Category
- Audio
- License
- Creative Commons — Attribution — Noncommercial
This is a new take on the 52mm Technics overhang gauge for correct pickup alignment in a replaceable headshell in a Technics standard S-shaped arm.
The standard model relies on the needle being in line with an edge. I find this to be too dependent on the eye being in the correct position.
This take in based on the needle being optically in the middle of two slits. The slits are on each side of the needle.
The design is done in FreeCAD using the parts workbench, simple use of primitives put together.
Originally I thought to light the needle from the bottom with a 5mm LED, but have found in practice that it is better to just hold it up to a light source. But I have retained the 5mm LED opening in case there are others that will have better results with this way.
You will most likely need a magnifying lens; I found using the 10x lens from a magnifying thread counter linen tester gave very good results. The lens is small enough to easily fit the gauge.
There are 3 versions, 0.4mm slit, 0.3mm slit, and 0.2mm slit – all are made to fit an up to 24mm wide headshell and pickup. Depending on what you have available in optical tool one will be better for you than the others. I use the 0.4mm version for first alignment and the 0.2mm for final check.
Please note that there are other alignment standards for tonearms that use the same type of headshell, please check your record player tonearm specification.
All shown versions are printed in PLA on an old, trusty Prusa i3 with a 0.6mm nozzle.
15% infill – I used rectilinear.
Top and bottom fill concentric – just for the fun of it.
Auto generated supports.
Post processing; remove supports and clean the slits with a scalpel type – I used #11 blades. There is enough give in the material to revert back to the original opening; this was checked with a feeler gauge.
