Level 3 Diploma in Plastering

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Setting out in-situ mouldings and raking moulds

PowerPoint Rupresentation

Unit 311: Running in-situ moulds

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Setting out for curved and raking mouldings Learning outcome 3.5: identify the process for setting out:

•  Semi-circular and segmental arch mouldings

•  Obtuse, Gothic, Lancet and Tudor arch mouldings

•  Eleptical peg and trammel arch mouldings

•  Raking moulds to inclined ceilings

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Arch mouldings are run by fixing a gig stick to the stock of the running mould and spun from a centre block or pin.

Springing line: represents the start and finish of the arc.

Rise: the centre height of the arc from the springing line.

Semi-circular arches are the simplest form of arch to be run, as this can be run from one centre point.

Horseshoe arch designs will run slightly lower than the springing line.

Other types of arch designs will need to be run from more than one centre point.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Forming in-situ arch mouldings

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Semi-circular arch Semi-circular arches are the simplest form of arch to be run, as this can be run from one centre point.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Segmental archway Setting out a segmental archway.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Gothic arch Setting out and running geometrical arches from two sides of the arch with a gig stick and raised centre block.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Lancet Gothic arch Setting out and running geometrical arches from two centres outside the arc with a gig stick and raised center block.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Obtuse Gothic arch Setting out and running geometrical arches from two centres with a gig stick within the arch.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Tudor arch Setting out and running geometrical arches from four centres to form the arch with a gig stick.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Elliptical arch Elliptical arches are set out using various methods The two most common are: •  Trammel board •  Plasterer’s oval

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Elliptical arch with trammel board

The trammel board is fixed to the centre of the archway opening. The horizontal centre line of the trammel must be level with the springing line.

When the mould is held in the correct position the trammel rod can be fixed to the stock at one side and fixed to the runners at the opposite side, which allows the mould to form the elliptical arch.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Elliptical arch template with plasterer’s oval Setting out a template using the plasterer’s oval method for an elliptical arch with peg mould.

Ratio of 3:2

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Running in-situ arch mouldings Elliptical arch with peg mould

Running elliptical arches using a peg mould running off a template.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Raking moulds Setting out in-situ mouldings to inclined ceilings.

When running and forming moulds to falls when the ceiling and wall are not at 90º angles, you will need to produce raking moulds.

You will need three running moulds to carry out the moulding work.

The first running mould will form the rake (incline) while the other two running moulds will form the lower and upper horizontal part and the other moulding.

The lower horizontal ceiling mould is termed as acute and the upper horizontal mould is termed as the obtuse angle.

The smaller mould will run the acute angle and the larger running mould will run the obtuse angle.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Raking moulds Setting out in-situ mouldings to inclined ceilings.

To achieve the profile of the upper and lower profile cornice it is required to form the profile by:

1.  Drawing 90º internal angled cornice section between lines of the correct ceiling rake.

2.  The upper and lower sections are developed with vertical lines from the horizontal projections.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Raking moulds A, B and C are of equal width.

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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In-situ moulding Online resources

Running straight www.youtube.com/watch?v=XjuhDyCbarA

Running curved www.youtube.com/watch?v=QtVoht6QAYs

External in-situ mould www.youtube.com/watch?v=lJ244BgusJA&src_vid=5RC70g-r-s8&feature=iv&annotation_id=annotation_256475

Level 3 Diploma in Plastering

© 2013 City and Guilds of London Institute. All rights reserved.

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Any questions?