Introduction To Stone Masonry With Nigel
A pictorial blog post showing the creation of an ovolo mould in Maltese limestone by a client on a recent Introduction To Stonemasonry course.
Everything in stonemasonry is a flat surface, so the first thing to do is work a marginal draft along the side of the stone to practise this. The draft is worked with a one inch chisel and mallet.
The first stage in working an ovolo mould is an initial chamfer. The chamfer is created by first working a marginal draft around it’s perimeter, then the centre is worked flat using the outer drafts as guides.
With the chamfer worked, the fillets are next. Fillets are considered to be one of the hardest things in stonemasonry because of the fact there are two joining surfaces. However, if they are worked as two separate drafts then joined together, it makes it easier.
With both of the fillets worked, a series of chamfers is now worked around the curve of the mould. Each chamfer is checked for trueness with a straight edge. At first there are two chamfers, these then become four, and so on.
With the chamfers worked to a point that they start to become a curve, the mould is rubbed round with a tungsten rubbing block.
The straight through return is now marked on, together with it’s associated chamfer.
With the chamfer of the return removed, the fillets are marked on and worked.
A series of chamfers are now worked on the return.
As with the front face of the stone, when the chamfers start to take on the curve of the mould, it’s rubbed round with a tungsten rubbing block.
The opposite return is now marked on, the previous return was straight through, but in this case it’s a return and stop.
The chamfer of the return and stop is now worked.
With the chamfer of the return and stop worked, the fillets are now marked on and worked.
As with the opposite return, a series of chamfers were worked until it took on the curve of the mould. After this it was rubbed round with a tungsten rubbing block.