A new reamer arrived from BBT (http://www.bbt.scot/) yesterday.
I have some new ejectors to fit in an over and under 12 Bore shotgun and ejectors often come without the cartridge rim cut-out so time for a new reamer and who else to speak to than Border Ballistic Technology as they are UK based and they always supply a quality product in a timely manner. On this occasion I contacted Dr Geoffrey Kolbe of BBT and explained what I needed and he said he would have a think about the design and get it sorted and this is what it looks like. I do like the BBT take on the design and look forward to using it later this week.
BBT say the following:
The problems with rim cutters for chambers like the 12 bore is firstly to ensure the cutter stays centred and concentric to the chamber, secondly that the cutter is well supported and thirdly that it does not chatter. Offerings by other reamer manufacturers do not seem to satisfy these requirements well, so we have developed this rim cutter, seen above.
12 bore rim cutter detail The rim cutter is supported by the pilot which locates in the bore at the front. There is a sliding tapered cylinder which sits in the back of the chamber, so the cutter well supported and yet able to slide freely on the cutting axis. The tolerance and concentricity of the pilot and sliding tapered cylinder ensure the cutter is very well centred to the chamber.
We see a lot of sporting guns at this time of year and as the season progresses things come in showing signs of wear and tear, mainsprings fail, firing pins burn, safeties fall apart and things generally start to rattle loose.
With a fortnight left in the season a non select single trigger shotgun arrived. It was failing to fire the second barrel so time for a complete strip and inspect and here is a rather poor image of the trigger assembly partly stripped down on the bench. This particular shotgun is probably around 100 years old and caused some head scratching before I identified the issue and I can say with some conviction that I am now intimately acquainted with such triggers. The gun was serviced at the same time and I took it out for a test firing yesterday and everything looks good so the gun can be collected by its owner for another days shooting.
Today I really hope I can get back on machining, with only two of us in the workshop it is so easy for one side of the business to slip and right now I have both gun work and machining to get on with if we are too keep customers smiling.
Snow outside and 6C in the workshop suggests Winter has not left the Wolds quite yet which is probably why I am so looking forward to my next cup of coffee 🙂