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National Floor
Our American friends call this a "Bottom Board"

3rd Angle The Grain should run along the longest dimension of any part.

Cutting of parts (all dimensions in mm).
QtyLengthWidth ThicknessMaterialUseage
246049 22pineSide Rails
1416 2222PineRear Top Rim
1416 229PineFront Under Rim
1 set
460 total
428 Random
18PineFloor Boards (see note)
National Floor (22 mm rim)

Can be used with 22 mm rim upwards, with or without entrance block. or with the 9 mm rim uppermost if brace comb becomes a nuisance.

Note 2.
9 mm is specified for the thickness of the under rim material but commercial supplies are often of 8 mm thickness, using 8 mm is unlikely to cause any problems but the underside of the side rails will need reducing to compensate.

Assemble using a waterproof PVA type glue and 50 mm pins or use twinthread woodscrews for a more reliable and permenant job.

The version as drawn above is both simple and durable. If petroleum jelly is used on the rim and linseed oil is used on the Rest of the parts, the item will give many years of good service.

The Entrance block for use with this type of floor should be 421 mm x 21 mm x 21 mm with notches in two adjacent faces giving entrances of 120 mm x 8 mm or 20 mm x 8 mm. Soaking the entrance block in linseed oil and coating with petroleum jelly when dry will ensure a lifetime of use.

Another version has been widely manufactured that has only an 18 mm top rim. I include the details below for completeness sake, but in my opinion the small saving in cost and weight is offset by reduced strength and life expectancy.
QtyLengthWidth ThicknessMaterialUseage
246049 18pineSide Rails
1424 1818PineRear Top Rim
1424 229PineFront Under Rim
1 set
460 total
430 Random
18PineFloor Boards (see note)
National Floor (18 mm rim)

With this type the
18 mm entrance block
is stopped from entering the slot by staples or small wooden blocks fixed 18 mm from front edge.

The individual floorboards can be any random width to make a full set that totals 460 mm.The type of joint to be used, as per the detail below, will depend on the machining facilities available.

Detail of floorboard joints

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Revised... 29 September 2001