Guillotine shear

I have access to a cisaille (also known in English by the wonderfully evocative name of "guillotine shear"). It's a Gerver GG-4.


The piece of metal on the left is a 222mm (5U) × 1m sheet of 3mm aluminium alloy. Duralumin, to be precise (a.k.a 2017 a.k.a AU4G).

The clamp is there to prevent the sheet from shifting while it's being cut, which would result in an oblique or even curved cut. The big bar you see in front of the blade is supposed to hold the sheet in place by pressing down on it but with strong material like this, it's not always sufficient.

The other machine in the background is the bending machine (la plieuse in Französisch).


Side view. The vertical handle is the lever on which you pull to lower the blade. To cut hard material like 1.5mm steel or 3mm aluminium, I fit a longer tube around the handle for more leverage.


A close-up on the ruler. This is where you set the length of the pieces. Here, it's set to 44 mm (1U minus some slop). This ruler is not quite exact; the pieces tend to come out longer than the preset length by a couple tenths of mm. You have to take this into account.


The first two panels made off this sheet. The one on the right is shown with the protective film up.


One 3U panel, seven 2U panels, five 1U panels and the offcut (less than 3 cm).


If you're wondering what the protective film is for, look at the scratches on the surface of the top 2U panel. The guys at the shop don't exert more care than necessary.

Gerver is based is the Netherlands. They must still exist because Adamant AB distribute their products in Sweden but they don't seem to have a net presence.

This is, last modified on 2005-06-05.