An NSR Absolute Block instrument

I wonder if @Rob Pulham has any thoughts on this brass post? Repair or replace.. having thought about it, a 3D printed one will be OK with the bell initially mounted upright and the weight pushing down, but when eventually it needs to be hung and the box is rotated 90
Deg, I’m worried the weight of the bell dome may pull the resin still? If nothing else… it will be a test of the resin!
(Still trying to match the thread..
Adrian crafter came back to me on threads for the bell post and the hammer rest…

“I would have thought from the photograph and knowing how it works, the
hole in the Hammer Rest would be threaded. The size would suggest 1BA. The
thread on the top of the Bell Post (pillar) is either 0BA or 1/4" Whit
judging by the size, most probably the 0BA size as that would be more
normal.”)

 

Hi Rob,
No I quite understand folk have other things going on, we all seem to be focused else where the last month.

I’m not sure they actually are two parts? Although the bottom has been drilled and threaded, but Peter has had a similar one and not succeeded in separating. And I would suspect, would it not have had a grub screw or similar to retain if so?

I have done drawings.. I’ll see if I can attach them. Although I posted above re threads, I’ve not yet had any taps or die to confirm.

Ive added some photos of the bottoms of the bell post and the wrong hammer rest I was sent (too small and wrong shape) both have the same inside drilled out and threaded. I wonder if this was for securing in a lathe?



You can see where Peter had tried to grip it and damaged the surface.

 

There doesn’t appear to be much in the way of spares. Hence working on these bits first. I still need to make the hammer rest.

even I could probably do it with someone reminding me on a lathe, but alas, that’s a tool I don’t have.

 

The final bit of “to make” items as I can’t seem to get anything close off the shelf is the beading for holding the glass in to the front of the top over the block instrument.

Peter has found some that had been recovered at some point, kindly sent me a photo and the measurements and also sending a sample in the post, but, whatever it will be a make up part.

Turns out it’s more triangular shaped. I was suspecting a flat trim with a rounded top, so it came as a surprise. I’m suspecting the angle to the front matches the chamfer cut on the part the other side of the glass.

So, now we know.. here’s to making some small wood strips.

 

I’d already checked B&Q and the local timber merchant.

father in law has now made me some out of Sapele which I’m hoping will match in. Cost me nothing as come from some scrap off cuts.

 

The sample piece of wood has arrived, but looks like it got snapped in the post in to 4 bits. Oh well. I’ve managed to glue it. Now to cut my strips and see if I can recreate the shape.


I’ve also finally managed to get in the lock for the bell box, so can look at a key. However I still need to work out how to re do the catch part that they lock over.

in the end I’ve had to drill the screws as it appears the ends had been peened over or milled. I managed to free one a few weeks back, but a screw 2 was not having it. I’d charged my drill yesterday and thought I’d just give it one last tickle. There was a small gasp of horror when the drill bit suddenly gripped something and stopped and then went again. Seems it had bit in to the screw and actually undid it for me. I was then worried I may have drilled away the thread in the brass back plate, but upon swapping the screws over side to side, they both bit back in and hold it secure.