Presentation on theme: "Hopper bevels True Mitre angle EDGE True face angle FACE"— Presentation transcript:
1 Hopper bevelsTrue Mitre angleEDGETrue face angleFACEHopper bevels are made up of Compound Mitres. These are angled on both the face and the edge of boards as in the hopper exercise used in this PresentationCompound mitres are often used in Shop display fittings, to form sloping window beds and display units.Some times the display item has more than four sides. This makes it a little more difficult, but setting out the angles uses the same theory.
2 1. Identify the pivot point PIVOT POINT Typical hopper shape1. Identify thepivot pointWe establish a pivot point which is an edge upon which the angled side can pivot.
3 We lay a side down to get a view of it from above PIVOT POINT2. Lay downtheside.
8 3. Look from above to get the true shape We look at it from above so we can project down and create a plan view or True Shape of the sidePIVOT POINT3. Lookfromaboveto getthe trueshape
9 3. Look from above to get the true shape We look at it from above so we can project down and create a plan view or True Shape of the side3. Lookfromaboveto getthe trueshapeTrueShapeofSide
10 Follow the steps in the next set of slides Print out the slide notes pages first
11 First Draw an elevation and plan view of the hopper HEIGHT OFF SET See your trainer for the sizes of the hopper. It will have a height and off set. The offset is the distance the hopper is tilted out or in.If the corners on the hopper are all the same. When setting out for the angles and bevels you will only need to draw one corner. You need to get the the vertical height and off set correct.The offset is the tilt in or out of the side.
12 1. Extend the base line Extend the base line Pivot point 1. Extend the base line from the pivot point using a “T” square. Make sure it is long enough.
13 = thickness of side material Pivot point2. Set thethicknessof thematerial2. Measure up from the base line the thickness of material and with a”T” square mark in the thickness of the material.
14 = thickness of side material 212= thickness of side material1Pivot point3. Numbercorners anddrop downlines witha compass3. Number the corners. Then use a compass from the pivot point extended to point 1 to mark a curve down to the base line.Keeping the compass point at the pivot point extend the compass to point 2 and mark a curved line down to the thickness of the base line.
15 = thickness of side material 212Join 1 to 2= thickness of side material1Pivot point4. Join points1 & 2From the base line join the new points 1 & 2
16 5. Extend point 3 to the thickness line 2 1 Bring up point 3 to the thickness line2Join 1 to 2= thickness of side material31Pivot point5. Extendpoint 3 tothe thicknessline5. Using a compass again from the pivot point, extend it out to point 3and rotate it up to the thickness line.Note: be very careful, sometimes it can be difficult to locate the new point 3 accurately.
17 6. Join Pivot Point to the new point 3 2 1 Join pivot point to new point 32Join 1 to 2= thickness of side material31Pivot point6. Join PivotPoint to thenew point 36. Join the pivot point to the new point three. This line should be parallel to the line 1,2.If its not you will have trouble setting out the correct mitre angle
18 7. Drop down the lines. Drop down lines 2 1 3 2 3 1 Pivot point From the newly established points 1, 2 & 3 drop vertical lines down.Drop down lines
19 8. Extend the corners 1 to 1 2 to 2 3 to 3 2 1 3 2 3 PP hasn’t moved 1 Note all corners have been numbered8.2 to 23 to 3
20 9. Join the points, a. 1 to 2 c. 3 to pivot point d. Pivot point to 1 PP hasn’t moved19. Join thepoints,a. 1 to 211223b. 2 to 39. Join up the points 1 to 2, then 2 to 3, then 3 to the pivot point and finally from the pivot point back to the start at point 1.c. 3 to pivotpointd. Pivot pointto 1
22 10. Overlay thickness of material across mitre 2 1 3 2 10. Overlay the true thickness of the material across the plan view of the mitre at 900 to the plan view of the mitre. You should have a slight rectangle NOT a square if you have been accurate.true thickness of material
23 11. Mark a diagonal to find the true mitre angle 2 1 3 2 1 Extend the lines to make it easier to set up a sliding bevel and get an accurate mitre angle.true thickness of material