Cutting an ovolo mould

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A short introductory presentation on how to produce an ovolo mould on sandstone using traditional tools and techniques

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Cutting an ovolo mould

  1. 1. Cutting an Ovolo MouldIntroduction for Stonemasons Stonemasonry Department 2012
  2. 2. Mould RecognitionAn ovolo moulding consists of a TOP BED OF FILLET STONEnumber of elements which can beseen in the diagram. It is essentialthat you are able to readilyidentify each element so that youcan follow the correct proceduresfor setting out and cutting an OVOLOovolo mould. FILLET FACE OF STONE
  3. 3. Roman Mould Development Begin by marking the total width of the mould on the base line to form points A and B. A 140mm B
  4. 4. Roman Mould Development Begin by marking the total width of the mould on the base line to form points A and B. Strike lines at 90 to the base line which run through points A and B 140mm A 140mm B
  5. 5. Roman Mould Development C D Begin by marking the total width of the mould on the base line to form points A and B. Strike lines at 90 to the base line which run through points A and B 140mm Mark the total height of the mould from point A and strike a line to form a perfect square and form points C and D A 140mm B
  6. 6. Roman Mould Development Begin by marking the 20mm total width of the mould on the base line to form points A and B. Strike lines at 90 to the base line which run 60mm through points A and B Mark the total height of the mould from point A and strike a line to form a perfect square and form points C and D Construct the grid for the mould using the appropriate sizes 20mm 60mm
  7. 7. Roman Mould Development Begin by marking the total width of the mould on the base line to form F points A and B. Strike lines at 90 to the base line which run through points A and B Mark the total height of the mould from point A G and strike a line to form a E perfect square and form points C and D Construct the grid for the mould using the appropriate sizes Using centre E strike a curve hitting points F and G to form the cavetto.
  8. 8. Roman Mould Development TOP At this stage the mould is BED complete and you should darken the appropriate lines to better define the mould. If you are producing a template you should complete the template by including all relevant information eg mould name, type of template, your name, top bed and joint etc. FACE A STUDENT OVOLO JOINT TEMPLATE
  9. 9. Cutting an Ovolo Hold template to top bed and face of Mark template to both Cut a splay to remove stone, making sure to align it properly joints and scribe across the waste stone. The by holding a straight edge against the the top bed and face to splay should be 2- aligned face and bringing the template join the profiles. 4mm above any to meet the straight edge. cutting lines. Run the mould through by setting in along the arrises, Set in the mould on Set in the fillets at the top and both joints and check Join the fillets bottom of the mould, checking teething down and chiselling.The mould should be checked accuracy with joint along the length with a sinking square that theyfor straight between the joints and reverse of the mould. are square and at the correctand a reverse template can be templates. depth. used to check for accuracy.
  10. 10. Marking a Mitre A mitre is the term used to describe the arris formed when adjacent mouldings intersect. There are both external and internal mitres. EXTERNAL MITRE MITRE BLOCKS STEEL SQUARES There are two common methods of marking a mitre line; using mitre blocks andusing two steel squares. The mitre block method is often easier but a stonemason is more likely to carry the squares in their toolkit. Your course tutor will demonstrate each method in the workshop.
  11. 11. Cutting an Ovolo to an Ashlar Stop Begin by marking an external mitre line on the existing mould. The top point of Mark a splay to Set in the fillets at the top and this line is determined by applying the remove the bottom of the mould, checking joint template to the back of the stone wastage from the with a sinking square that they and squaring, from the face, to the top return mould. are square and at the correct of the fillet depth. Run the mould through by Set in the mould at setting in along the arrises, the mitre and close to Join the fillets teething down and chiselling. the ashlar stop and along the length The mould should be checked check accuracy with of the mould. for straight between the joints reverse template. and a reverse template can be used to check for accuracy.
  12. 12. Developed by The Stonemasonry Department City of Glasgow College 2012

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