'Other' Construction and Allied Systems Info & 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.

The MCS document for this system is shown below. It can also be downloaded to your computer if desired here

The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided


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.