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DescriptionGin gang 017.jpg |
English: Showing pivot at end of main power shaft of horse mill in gin gang at Beamish Museum, County Durham, England. It is pivoted in a second horizontal beam, and not in the tie beam (seen behind) in which the top end of the main vertical spindle shaft is pivoted.
A gin gang is a structure built to enclose a horse mill, usually circular but sometimes square or octagonal, attached to a threshing barn. Most of the wood used here would have been seasoned oak originally, but much has been replaced during preservation, including apparently the main oak spindle-shaft of the mill, which appears to be unseasoned and cracked.
This renovated internal roof structure is based on a traditional space frame truss with its primary plane in line with the tie beam (or joist), and with members fixed between king post and rafters to support the semi-octagonal plan of the roof. There is one main transverse oak tie beam on which the king post of the main truss is based. The king post is in tension to prevent sagging of the horizontal tie beam, so neither the king post nor the tie beam are resting on the mill below. The roof construction is not structurally dependent on the horse mill, or connected with it. The top of the mill's main vertical spindle shaft and the end of the main power shaft are pivoted at the centre of their own separate tie beam which is below and parallel with the main roof tie beam, and set in the gin gang's side walls at either end. The mill's tie beam has to be stabilised with two massive oak beams which run, either side of the power shaft, from tie beam to barn wall. A large and basic engine like this can create great stresses from the torque engendered.
This is based on a central, vertical, heavy, 10ft high, oak spindle shaft, with its base pivoting on an iron framework set in the middle of the gin gang floor. Its top end pivots under the mill's own tie beam (if it didn't, it would fall over) but the tie beam cannot rest on the pivot, or the mill would not turn. The spindle shaft supports around its top end the main, 6ft-diameter, horizontal gear wheel, with the teeth on the top surface. The main power shaft, a massive oak pole, is girthed at one end by a secondary gear wheel which lies on the main gear wheel, thus turning the main power shaft on its long axis. The main power shaft runs from the main gear wheel through a hole in the barn wall and in the barn it powers the threshing machine and other machines via further cogwheels and belts. Such a machine would create great torque stresses, and if it were ever to work again it would require re-engineering to ensure smooth and safe running, and beams which are seasoned and not cracked. NB: This mill was rescued from Berwick Hills Low Farm, Northumberland, and has had some repairs since then.
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Date | |
Source | Own work |
Author | Linda Spashett, Storye book |
Permission (Reusing this file) |
I, the copyright holder of this work, hereby publish it under the following license: ![]() ![]() This file is licensed under the Creative Commons Attribution 3.0 Unported license.
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17 April 2010
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current | 16:53, 19 April 2010 | ![]() | 2,736 × 3,648 (2.39 MB) | Storye book | {{Information |Description={{en|1=Showing pivot at end of main power shaft of horse mill in gin gang at Beamish Museum, County Durham, England. It is pivoted in a second horizontal beam, and not in the tie beam (seen behind) in which the top end of the ma |
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Camera manufacturer | NIKON |
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Camera model | COOLPIX P5000 |
Exposure time | 1/8 sec (0.125) |
F-number | f/2.7 |
ISO speed rating | 553 |
Date and time of data generation | 14:42, 17 April 2010 |
Lens focal length | 7.5 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | COOLPIX P5000V1.0 |
File change date and time | 21:56, 17 April 2010 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 21:56, 17 April 2010 |
Image compression mode | 2.0038986354776 |
Maximum land aperture | 2.9 APEX (f/2.73) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Sharpness | Normal |