Ветряные мельницы, страница 2

and it is also desirable to paint,  or dip in boiled oil,  all screws,  bolts,  etc. ,  before inserting them.

Two applications of  creosote,  or of  one of  the weU-known preservative wood stams,  one before and one af ter

erection,  could take the place of  painting.  A further application at the end of  a year would be advisable.  The

timbers in the ground must be tarred.

The Turvrtable (Fig.  66,  d,  e,  /),  which carries the wheel and tail vane,  is built up of  2^in.  by 2-in.  timber,  and 2-in.  bore galvanized wrought-iron ^^water'' tube and f langes,  the latter being easily obtainable f rom an

ironmonger.  The upper f lange,  which forms a support for the timber f raming.

is to be ooontersunk (this can be easily done with a half -round f ile),  and screwed very tightly on to the tube as

far as it will go; the end of  the tube should project slightly beyond the face of  the f lange,  so that it can be riveted

over to f ill the countersink,  and thus leave no possibility of  unscrewing (see detail drawings.  Fig.  66,  g,  h).  The

two loose f ianges,  which are bolted to the f ramework of  the tower,  are for 2-in.  pipe,  but the thread has been

carefully f iled away,  so that they may sUde f reely,  but without shake,  on to the tube,  the upper loose f lange

forming a footstep bearing,  and the lower one a guide,  for the turn-table.  Windmill makers now mount the turntable on a ball-bearing to ensure that the mill head may turn f reely; hence careful f ltting is essential here.  The

two back nuts are to guard against any possibility of  the turn-table being lif ted out of  place.

The Head.  —^What woodwork is required for the head (the part carrying the wheel spindle) will be evident f rom

Fig.  66,  d,  e,  /.  The joints are simply notched and secured with {-in.  bolts.  The upright,  which carries a bolt or pin

for the spur-wheel to revolve upon,  is stayed in f ront and at the sides by a piece of  hoop iron; and the tail vane

swivel is a piece of  ^in.  bore tube with back nuts and washers,  through which passes an iron bolt,  or rather a

piece of  iron,  screwed at each end

21« THINGS WORTH MAKING.

and f itted with four nuts and washers.  All woodwork,  as well as bolts and screws,  should be painted before being

put together,  as recommended in the case of  the tower.

WJ^eel Shaf t.  —^For the wind-wheel shaf t and hub,  seen in the various views and in detail in Fig.  67; k,  I,

wrought-iron tubing and f langes have again been called into service.  The bore of  the tube is } in.  (nominal),  the

outside diameter being 1^ inches.  Both tube and f ittings should be of  '' steam'' quality,  which is a gauge thicker

than the ^' water" quality.  A slight skim over in a lathe would be an advantage,  but careful f iling followed by

emery cloth will do,  if  a lathe be not available.  The tube is screwed a good way up at one end to receive the

f langes forming the hub,  which are screwed on and secured on one side by back nuts,  and on the other by a

distance piece composed of  IJ-in.  bore tube.

To close the open f ront end of  the tube and to give a f inish,  a f -in.  ^^ cap'' is f itted.  Two plummer blocks,  with

brasses H inch,  long and f itted with Stauf fer grease lubricators,  are required as bearings for this shaf t.  Perhaps

these had better be purchased; the cost would probably be under 15s.  The exact diameter of  the f inished shaf t

must be stated when ordering,  as plummer blocks are stocked only in regular sizes—for example,  1 in. ,  1} in. ,

etc. ; the usual custom is

to charge for the next larger size when cji odd diameter is asked for.