Amelia Squariel: Charlie’s Shed – repairing hexagons

Some whereas again I made a set of latest chain adjusters for the Mannequin A – the publish is right here. It took some time and wasn’t significantly tidy – I made the screws on the lathe, constructed the heads up with weld and milled the small hexagons. 

This publish is about fixing an identical difficulty. 

I used to be adjusting the rear chain on the W/NG at some point, puzzling for the umpteenth time in regards to the hex measurement which did not match something aside from an 8 mm spanner, once I realised the hex heads had been filed to swimsuit  spanners that may have been accessible in Italy the place the bike had spent most of it is life.

I resolved to repair them, and got here up with a greater method of doing it than the final time. Here is the issue:

I took the adjusters off and eliminated the paint in order that I might maintain them in a 8 mm collet.

I turned off the stays of the hexagon, leaving a diameter of 1/4″:

I put a 1/4″ BSF thread on the top, to swimsuit some diminished hex nuts I discovered on eBay:

I added an undercut, so the nut, chamfered on one aspect solely, would comfortable right down to a sq. shoulder:

I brazed the nuts in place, not wishing to danger damaging the small hex with weld:

I cleaned them up on the wire wheel, and so they look as if they’ve been there for years:

That took about an hour, with a a lot easier arrange than final time.

The one problem I discovered was acquiring nuts with that measurement hex – I can not discover bar inventory in that measurement – the smallest I can get is 0.445″, which is for 1/4″ BSF or CEI, or 3/16″ BSW. It occurred to me {that a} easy option to machine a small hexagon bar to make nuts sooner or later could be to start out with a bigger one (may very well be metric or something), maintain it in a milling vice and cut back it with an finish mill, utilizing the bigger hexagon to orient every face whereas I machined it smaller.