Akmena windmill is a round, cone shaped, stonewall tower type Dutch windmill with a stage and rotary cap. 

The full height of a mill is about 19 meter. Wind circle diameter is 25 m. Height of stonewall body is some over 14 m., height of a cap –4.7 m. Outward tower diameter – 14.6 m., wall thickness - 1.1 m at ground level    and 6.7 m. diameter and 0.64 m. thickness at 14 m. level. There are 12 openings in windmill's stone body - for 4 doors and 8 windows. Akmena windmill has ground floor, so called “parter” (parteris in lithuanian), there are 4 joist ceilings, i.e. first ,second, third and fourth floors. If we include a cap, - our windmill is a six floor building.

At a ground floor two two-sided doors – north gate and south gate were arranged and also two windows – west, from highway side and east, from estate side were arranged. Besides there are two round stone columns, supporting first floor joist ceiling and stairs to first floor at west side. 

On the first floor , across ceiling joists , three long joists platform and across it three short joist upward shaft support platform is arranged. On this platform  upward shaft bearing (“poniauka” in Lithuanian) and  upward shaft (“drailingis” in lithuanian) are mounted. On the same three long joist platform , on its both ends two millstones bearings with millstones vertical shafts were set. High, under the ceiling , on  upward shaft large, more than 2 meter diameter large gear wheel ( “shtinratis” in Lithuanian) is clutched with both millstones' gear wheels (“bunkulis” in Lithuanian). Also here you can find east and west doors to a stage.

On the second floor there were two millstones on west and east sides for rough and tine melting, stairs to third floor and two windows.

The third floor was used as a corn storehouse. There were two corn boxes, used to fill millstones. Besides there were stairs to two fourth floor and two windows.

The fourth floor was transitional to winds cap. There are no windows. Upper part of corn sack lifting mechanism earlier was arranged here. Top edge of mill’s stone walls is at one and half meter level from the floor. Convenient access to inner side of cap turning mechanism is provided. Besides there was a little staircase to mill’s cap.

On the top of stone walls the main part of cap turning mechanism, “mill’s neck” is arranged. It consists of: 1) 6.70 m. outward diameter wooden gear i.e. crown- wheel, fixed on the wall , 2) 6.60 m. outward diameter ball-bearing on the gear and 3) cap supporting rotary platform of octagonal ring form above. The full weight of this mechanism is about 4 tons. It is the base to 10 tons weight windmill cap. Cap is fixed on a rotary platform. Cross section of cap turning mechanism wall based part is shown in fig. 1.

The mill’s "neck” wall-fixed gear consists of 24 sections, 8 teeth each, total 192 teeth.   It can be clutched with cap-fixed gear as from outer side of a mill, as from inner side of a mill.  The width of wall-fixed gear is 25 cm., height – 26 cm. Tooth’s length is 24 cm, height – 12 cm., width (thickness) – 5 cm. Tooth "step" length is about 11 cm.

Earlier system of cap-fixed gears was arranged from external side of a mill. It is approximately known, that diameter of those cap-fixed gears was less than 1.5 meter. It was a system with so called “infinite chain”. Cap-fixed gear is yet not arranged.

We have designed 6m. 60cm diameter wall–top ball-bearing, whose form slightly differs from original, ancient one. When beginning segment's design we had only two broken examples of original ancient segment of our mill. Those were tightened to a wooden base with two screw bolts at a center of rails path. In both cases old segment brake line coincided with screw bolt hollow. It implicated  those hollows could be a reason of segment breaking. Taking it into account we have designed more massive bearing segments with no tightening hollows in a center of segment. Our ball-bearing consists of two similar, lower and upper, iron, gutter form, ringed channels  (rails). The lower part of ball-bearing is tightly fixed on wall based wooden crown gear and consequently is fixed to mill’s walls, while the upper channel is tightened to rotary cap platform and to mill’s cap. Oval gap between upper and lower channels is alternatively, by turns, filled with 110 iron balls and wooden logs  to form closed ringed path to roll round mill’s cap together with a sails to optimal wind direction, i.e. to face the wind . As lower as upper parts of the rails consists of 24 cast segments each. Rails segments were mould in Kaunas cast foundry in 1999.

The length of rails segment is 80 cm., width – 15 cm., thickness at path center – 2 cm., channel depth – 30 mm., weight - 40 kG.; iron ball diameter – 70 mm. ; ash wood logs are 14 cm. length, 70 mm. width and 65 mm. height. Thus, when mounted, distance between upper and lower rails channels is 10 mm.

Cap’s framework is made of fir wood and covered with white metal. Here sail shaft is mounted. It is made of steel pipe, whose outer diameter is 15 cm., inner diameter – 7 cm. Sail shaft is inclined to horizontal plane at angle of 16 degrees, - almost the same as the outer walls of our mill to vertical plane. At the end it rests on a conic bearing , arranged on a tightened platform. Near the front end wind shaft rests on gliding oak bearing. On the front end of a wind shaft iron sail cross (poll end) is mounted. Sail cross is run through by two crossed fir timber stocks and balanced. The length of those stocks is 12 m., cross section 25 cm x 25 cm.  Four sail stocks, 12.5 m. length each are made. Cross section of sail stocks is tapered beginning from 25cm x 25cm  at poll end   to  16cm x 16cm at the end of stock. 

That’s what is done at this time.