'Other' Construction and Allied Systems Downloads

Primus Engineering Construction Sets

Primus Engineering construction sets were made from both weed and metal. They were made in England from 1913-1926


Info from the Metal Constructional Systems Database

Maker
Butcher
System Type
Certain UK
Country
United Kingdom
Dates
1913 (see comment *1) to circa 1926
Material
Steel / Wood
Thread
5/32W
Boss Type
single-tapped
Boss Thread
1/8W (see comment *2)
Diametrical Pitch of Gears
38
No. of Parts in System
97 (see comment *3)
Hole Pitch (Spacing) (mm)
12.7
Diameter of holes in Strips(mm)
4.1
Diameter of the Bore in Bosses(mm)
4.1 (see comment *4)
Diameter of Axle Rods(mm)
4.0
Types of Nuts and Bolts
Nuts: square
Bolts: cheese (slotted)
Material/Finish of Nuts and Bolts
Steel with a Copper finish
Size of the Nuts across Flats (mm)
6.4
Bolt diameter (mm)
5.9(see comment *5)

Comments
*1 Or 14e. *2 Most, or 5BA? Some smaller. Later 5/32W. *3 Including Big Wheel parts. *4 Typical but up to 4.3. *5 For Bolts with slotted cheesehead look, but many others. Big Wheel N&B: 4x32 square nut and slotted mushroom head plain brass 6.4 7.6-7.9.

Below there are manuals/instructions which can be downloaded by clicking on the appropriate image.


A Primus Engineering instruction manual.
(Scans from Jean-Pierre)

A Primus Engineering instruction manual.