Battery replacement module for Chinese vernier scales

When I created the external 1.5V PSU modules for use with my DRO350 it struck me at the time it might be possible to create the same PSU in a dummy battery to fit directly into the scale battery socket.

I used the same AMS1117 regulator chip and decoupling capacitors mounted on a small pcb inside a short piece of K&S thin wall brass tubing.  The pcb was milled on the Tormach 440 with hand written G Code and using a dental burr as the engraver.  Once the pcb was soldered into the end of the tube I turned back the tube to leave the pcb proud of the tube to match the normal battery profile and spring contact in the scale battery socket.

It was a bit tight to put together but it works !   I am debating a full write up so look back in the future.

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Leaking compressed air components and Loctite 577

The arrival of the Tormach PCNC440 demanded a review of my compressed air infrastructure.   I have Bambi 24V pot belly compressor which previously only fed a dust off blower.   In addition to this, the compressor now has to feed the new Tormach power drawbar and the Fog Buster coolant system.

To aid distribution I sourced locally a 4 port manifold with an in and pass through in line.   This gave me a couple of spare ports for future expansion.

The Tormach PCNC440 arrived with US style push and lock black tubing and fittings with ubiquitous  1/4″ BSP threads.   Thank goodness something is common.   In total I had something like 15 threads to seal and PTFE tape did not do the job.   Soapy water revealed a bubble factory.

A quick scan on the web and it seemed that Loctite 577 was recommended.  RS had it in stock and it was a revelation to seal the threads.  You just squeeze a thin ring of 577 around the thread and screw it home.  Job done ….. but maybe they won’t ever come apart again …. well that’s a problem for another day.

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