"A-Z" INDEX

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

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

Cutting of parts (all dimensions in mm).

Qty Length Width Thickness Material Useage

2 460 49 22 pine Side Rails

1 416 22 22 Pine Rear Top Rim

1 416 22 9 Pine Front Under Rim

1 set
460 total 428 Random
Width 18 Pine Floor Boards (see note)

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.

Qty Length Width Thickness Material Useage

2 460 49 18 pine Side Rails

1 424 18 18 Pine Rear Top Rim

1 424 22 9 Pine Front Under Rim

1 set
460 total 430 Random
Width 18 Pine Floor Boards (see note)

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.

NOTE
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.

Revised... 29 September 2001

Qty	Length	Width	Thickness	Material	Useage
2	460	49	22	pine	Side Rails
1	416	22	22	Pine	Rear Top Rim
1	416	22	9	Pine	Front Under Rim
1 set 460 total	428	Random Width	18	Pine	Floor Boards (see note)

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

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