News and Restoration
5th December 2019 - Bolter progress In 2019 work has continued on the Bolter, which is nearing completion. Roger Bishop has generously donated his time and expertise for the cost of materials. Summer 2019 A substantial number of boards are being replaced on the roundhouse roof by our carpenter Dan Card. These are tapered boards, so to prevent gaps between the boards, they need to be allowed to shrink in situ for at least six months.  In the spring of 2020, the board ends will be tapped to take up any shrinkage, and finally trimmed to length. 19th March 2007 - Bolter progress The bolter has now been installed in the mill after some manoeuvring involving enlargement of the hole! The hopper frame has been built; this was very difficult due to the angles involved and the cramped access. In the end though it is a good fit, but we have not installed it yet as we are currently working on the rear bearing mount frame, which would be impossible with the hopper in position. As can be seen in the photo, the shaft has been temporarily installed; this will enable us to position the rear bearing. Part of the rear bearing frame is an original piece which will be the only original part; it was luckily still in situ even though the remainder of the bolter had disappeared.
The bolter in position at the rear of the stone floor on March 11th
As viewed from below
Compare this to the photo of the void below.
23rd July 2006 - Bolter progress We have almost finished manufacture of the main feed hopper, which just needs the entry hatch cut out. The hopper has been moved temporarily to the spout floor as we are struggling with room in the roundhouse. The main bolter shaft is now nearing completion so we have turned our attention to the fitting of the bolter in the rear of the stone floor. The old floor, which was actually only installed in the 1960’s has been removed and a start made on working out how the bolter can safely be bolted within the floor void.
Looking up through the floor void where the bolter will be mounted.
Looking up through the floor void where the bolter will be mounted.
The feed hopper (inverted). This is made from Douglas Fir and is fully mitred at the corners.
Checking the floor void for squareness is Gordon Hinton, one of our volunteers.
26th February 2006 - Bolter Progress
The general assembly drawing (AutoCAD) The bolter is basically a rotating sieve for grading the flour and is the last part of the restoration of the windmill. Although the original bolter was missing, by some good fortune we still have the remains of the central oak shaft plus a photograph taken in 1955 of the remains in situ, although I have to say that there was not much there! I knew of a bolter in Keston windmill near Bromley and a visit confirmed that it was almost identical in size and best of all the shaft was exactly the same size. So after several visits to measure the Keston bolter in detail the work began in November 2003 and is continuing after the production so far of 55 working drawings.
This view shows the lower bearing for the bolting drum and the hinged door to access the cloth. The hinged door is yet to be shaped to clear the rotating bolting drum.
A selection of parts for the bolting drum and drive. The oak shaft can be seen on the extreme right and the steel spindles on the left. The elm drive pulley is to the rear and the end ring is at the front.
Again this end will be inaccessible as it will be very close to the side of the mill. The bronze bearing for the top end of the bolting drum can be seen together with the traditional feed shoe support.
The face on the left will actually be against the rear wall of the mill once installed and so will not be seen. The end cover can be seen on the right for access to the bolting cloth and lower bearing. All of the frame and covers are made of Douglas Fir.
A close up of the oak dovetail pieces - these are dowelled in place and hold the end ring together without any glue!