8 Back Reliefs ArtCAM Back Reliefs Front/Back Reliefs In JewelSmith, you have the ability to display, in an ArtCAM model, either the front (which is the top of the ring) or the back relief (which is the inside of the ring) These two when combined make a new assembly model This new assembly model is machined using the multi-sided wizard The default mode for JewelSmith is to have no back relief when generating a basic ring or flat 3D shape The front and back relief is not exclusively for rings, it is a feature of JewelSmith and can be used on flat pieces as well Both the front and back relief can be made using ArtCAM techniques or be loaded in from an existing relief An assembly model is made from removing the back relief from the front relief (tick Use Back Relief), as the diagram shows The back relief can also be negative, to produce a court-ring The front relief is the master, from which the back relief is removed; this means that as long as the back relief covers the front relief the area will be removed, as this flat piece diagram shows JewelSmith 8.1 Back Reliefs ArtCAM JewelSmith Back Relief Ring • Select Create New Project • From New Blanks, select Rotary Shank • Enter the values as shown and press Next Note: In this case the ring is one size bigger to allow for shrinkage Copies of the centre line vectors can be offset to create the correct, ring shaft width • Select the Assistant tab • Select the centre horizontal locked vector line • Select Offset Vector(s) • Select an Offset distance of 2mm and select Outwards/Right • Press Offset • Select the centre horizontal locked vector line • Select an Offset distance of 2mm and select Inwards/Left • Press Offset The section needs to be generated • • • • 8.2 Select create a rectangular vector Enter a Width of 4, Height of at a Centre Point of X Y Press Create and then Close Select Node mode and remove the lower span JewelSmith Intermediate Back Reliefs ArtCAM The basic ring shape can now be made • Type N to return to Select Mode Hold down shift and select the drive rail vectors, the section vector and finally the ring profile vector • Select Sweep Profile Press F3 A square shape will be merge into the ring and some material removed • Press F2 • Select create a rectangular vector • Select Square and enter a Height of at a Centre Point of X Y • Press Create • Select Square, a Height of at a Centre Point of X Y • Press Create • Select Square, a Height of at a Centre Point of X 1.25 Y 1.25 • Press Create • Select Square , a Height of at a Centre Point of X -1.25 Y 1.25 • Press Create • Select Square, a Height of at a Centre Point of X 1.25 Y -1.25 • Press Create • Select Square , a Height of at a Centre Point of X -1.25 Y -1.25 JewelSmith 8.3 Back Reliefs ArtCAM JewelSmith • Press Create and then Close This geometric design will be merged onto the ring • • • • • • Select the biggest square vector and press F12 Select a flat profile, start height of 2.5 and press Merge High Select the square vector of height Select a flat profile, start height of 0.5 and press Subtract Select the four small square vectors Select a flat profile, start height of 0.25 and press Add and then Close The outer design of the ring is finished The inside design can now be generated • Select the JewelSmith tab • Open the Layers Assistant (F7) • From the Relief Layers pull down, select Back Relief The back relief is empty by default • • • • 8.4 Press F2 Select the square vector of height and press F12 Select a flat profile, start height of and press Add and then Close Press F3 JewelSmith Intermediate Back Reliefs ArtCAM The back relief is shown as the small square This is the part of the model that is going to be removed, when the new master model is generated • Select the Assistant tab Select Create Triangle Mesh • Set tolerance as 0.002 and Select Close with Back Relief • Select Create Triangles • Then select Add to Project • The file is now saved in the assembly on your Project tab By rotating the model around, you can see the area removed underneath the square top As this is not what is required, then the model will not be accepted and a new back relief generated • Select Back • From the Relief Layers pull down, select Back Relief • From the Assistant tab, select Reset Relief • From the Relief Layers pull down, select Front Relief • From the Assistant tab select Offset Composite to Back The value is a measurement of the thickness that will be left in the new master model JewelSmith 8.5 Back Reliefs ArtCAM JewelSmith • Select OK The new back relief is automatically created and displayed A new master model can now be made • Select the Assistant tab Select Create Triangle Mesh • Set tolerance as 0.002 and Select Close with Back Relief • Select Create Triangles • Then select Add to Project • The file is now saved in the assembly on your Project tab By rotating the model around, you can see the area removed underneath the whole model • Select the save icon • Select Close Project 8.6 JewelSmith Intermediate