WT4603Wood Processing Safety & PracticeLecture Unit 4 (Week 5)<br /><ul><li>PLANING MACHINES & SETTING PLANER KNIVES
 Lecturer: Mr. Joseph Lyster
joseph.lyster@ul.ie
 Notes prepared by: Mr. Donal Canty, Mr. Des Kelly and Mr. Joseph Lyster
 Notes available on www.slideshare.net/WT4603</li></li></ul><li>WT4603<br />Surface Planer<br />Planer Knives<br /> <br />...
Surface Planer<br />WT4603<br />Planers can have 2,3,4,6……. Cutter knives.<br />Most smaller machines such as those found ...
Surface Planer<br />WT4603<br />Knives can be made from Chrome Vanadium steel alloy. <br />This is suitable for machining ...
Surface Planer<br />WT4603<br />High Speed Steel (HSS) is a cobalt steel alloy with a small percentage of Tungsten added. ...
Surface Planer<br />WT4603<br />Abrasive stock should be machined using solid or tipped cutters.<br />Tungsten Carbide (TC...
Surface Planer<br />WT4603<br />The reason for this is that steel compounds are smelted and shaped by rolling and forging ...
WT4603<br />Surface Planer<br />Tungsten carbide is a sintered compound. The fine grain powder from which the cutter will ...
Surface Planer<br />WT4603<br />Because if its brittle nature TC cutters require a more obtuse sharpness angle than the HS...
WT4603<br />Surface Planer<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Knife Cutter geometry<br />Rake or Cutting angle<br />Angle created between the face of the cutting knife and ...
WT4603<br />Knife Cutter Geometry<br />Bevel or Lip Angle<br />Angle formed to give the cutting edge<br />Minimum of usual...
WT4603<br />Knife Cutter Geometry<br />Clearance Angle<br />Angle formed between a line tangential to cutting circle and t...
WT4603<br />Knife Cutter Geometry<br />Peripheral Cutting Speed<br />A constant speed in the range of 35-45 m/s will give ...
WT4603<br />Pitch distance<br />Combination of a rotary cut and a linear feed will leave the surface of the material with ...
Department of Materials Science & Technology<br />University of Limerick<br />WT4603<br />Pitch Distance<br />2mm to 3mm f...
WT4603<br />Pitch Distance<br />The SI unit of time is the second , but the minute is acceptable.<br /> <br />Feed rate on...
Pitch Distance<br />WT4603<br />The unit for “p” will be metres  (m)   <br /> <br /> <br />f 	m/min	 m	   min<br />p = ---...
WT4603<br />Pitch Distance<br />Problem 1<br />	Calculate the cutter pitch of a 4 cutter block revolving at 4200 rev/min w...
Pitch Distance<br />WT4603<br />	If a graded surface is specified and the machine has a multi-speed feed gearbox, the same...
Pitch Distance<br />Problem 2<br /> <br />	From a cutter block which rotates at 4200 rev/min and has two cutting knives, a...
WT4603<br />Chip formation<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Riving<br />Department of Manufacturing & Operations Engineering<br />
Riving<br />WT4603<br />Cracking occurs below the cut depth<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />A<br />On the surface planer the in-feed table (A) acts as chip breaker and the downward pressure exerted by t...
WT4603<br />Chip formation<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Chip formation<br />Chip breaking aid and pressure bar prevent riving and splintering<br />Department of Manuf...
WT4603<br />Square cutter blocks<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Square cutter blocks<br /><ul><li>Clamping bolts are in tension
Tension force increases with rotational speed
Will be ejected at failure</li></ul>Department of Manufacturing & Operations Engineering<br />
WT4603<br />Square cutter blocks<br />Clamping bolts are in tension<br />Department of Manufacturing & Operations Engineer...
WT4603<br />Circular cutter block<br />Clamping bolts are in tension<br />Department of Manufacturing & Operations Enginee...
WT4603<br />Circular cutter block<br /><ul><li>Reduced noise levels
Better balance
Safer clamping mechanism
Can run head at higher speeds (RPM)
Can produce better finish
Easier and quicker maintenance</li></ul>Department of Manufacturing & Operations Engineering<br />
WT4603<br />Knife clamping mechanism<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Knife clamping mechanism<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Knife clamping mechanism<br />Department of Manufacturing & Operations Engineering<br />
Cutter projection<br />WT4603<br />Round form tool with limited cutter projection<br />Department of Manufacturing & Opera...
Cutter projection<br />WT4603<br />Use of a limiter to achieve limited cutter projection<br />Department of Manufacturing ...
Cutter design<br />WT4603<br />Cutters should preferably be designed to be used in dimensionally similar pairs, formed to ...
Cutter projection<br />WT4603<br />The design of cutter blocks should, as far as is practicable, be such as to prevent exc...
Hand-fed machines<br />WT4603<br />For machines designed for hand-fed operations, where cutters are necessarily exposed, t...
WT4603<br />Surface Planer<br />Cutter and Machine Maintenance<br /> <br />Involves:<br /> <br />Grinding and setting of k...
Surface Planer<br />WT4603<br />The grinding angle of a cutter can vary between 30 to 35<br />This is increased to 40 f...
WT4603<br />Surface Planer<br />Overheating<br /> <br />May produce micro cracks in the cutting edge which can run into ga...
WT4603<br />Surface Planer<br />Overheating can be avoided<br />By taking light cuts.<br />By ensuring that the grind whee...
WT4603<br />Surface Planer<br />Setting Cutters in Block <br />Before setting the following points should be checked.<br /...
WT4603<br />Surface Planer<br />Setting devices<br />There are a number of cutter setting devices.<br />This device and pr...
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Setting Planer Knives<br />When planing wooden material a number of factors combine to generate the flat surfa...
Knife cutter design & Chip breaking aids<br />These factors combine to produce an acceptable surface finish<br />Tip of th...
Knife cutter design & Chip breaking aids<br />The cutter projection and the shape of the block face cause the severed chip...
WT4603<br />Knife cutter design & Chip breaking aids<br />Sharp tooling (a) will aid in the chip bending back and cracking...
WT4603<br />Chip Formation<br />Before knife makes its cut<br />Department of Manufacturing & Operations Engineering<br />
WT4603<br />Chip Formation<br />Chip to be formed<br />Department of Manufacturing & Operations Engineering<br />
Upcoming SlideShare
Loading in...5
×

Wt4603 unit4 week5

20,864

Published on

Lecture Unit 4 Week 5

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
20,864
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
72
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Wt4603 unit4 week5

  1. 1. WT4603Wood Processing Safety & PracticeLecture Unit 4 (Week 5)<br /><ul><li>PLANING MACHINES & SETTING PLANER KNIVES
  2. 2. Lecturer: Mr. Joseph Lyster
  3. 3. joseph.lyster@ul.ie
  4. 4. Notes prepared by: Mr. Donal Canty, Mr. Des Kelly and Mr. Joseph Lyster
  5. 5. Notes available on www.slideshare.net/WT4603</li></li></ul><li>WT4603<br />Surface Planer<br />Planer Knives<br /> <br />Important factors when selecting a planer knife<br /> <br />Suitability for cutter block<br />Material being processed<br />Finish required<br />Volume being machined<br />Clamping and setting mechanisms<br />Department of Manufacturing & Operations Engineering<br />
  6. 6. Surface Planer<br />WT4603<br />Planers can have 2,3,4,6……. Cutter knives.<br />Most smaller machines such as those found in schools will have 2,3 or 4 knives.<br />Department of Manufacturing & Operations Engineering<br />
  7. 7. Surface Planer<br />WT4603<br />Knives can be made from Chrome Vanadium steel alloy. <br />This is suitable for machining softwoods and non abrasive hardwoods. <br />However with advances in machining technology better materials have been developed to machine wood and wood composites. <br />Chrome Vanadium knives dull quickly on harder more dense material. <br />This requires more sharpening, setting up and leads to a lot of time wastage.<br />Department of Manufacturing & Operations Engineering<br />
  8. 8. Surface Planer<br />WT4603<br />High Speed Steel (HSS) is a cobalt steel alloy with a small percentage of Tungsten added. <br />It is more suitable for machining all types of wood than the chrome steel compounds.<br />Department of Manufacturing & Operations Engineering<br />
  9. 9. Surface Planer<br />WT4603<br />Abrasive stock should be machined using solid or tipped cutters.<br />Tungsten Carbide (TC) is the best tool compound for machining manufactured boards.<br />For general work HSS cutters are preferred to TC <br />Cutters can be re-sharpened easily.<br />A keener edge can be achieved on HSS giving a better finish<br />Department of Manufacturing & Operations Engineering<br />
  10. 10. Surface Planer<br />WT4603<br />The reason for this is that steel compounds are smelted and shaped by rolling and forging while the metal is close to melting point.<br />The molecules of the compound flow and align themselves in response to this pressure giving the material maximum strength and edge holding capabilities<br />Department of Manufacturing & Operations Engineering<br />
  11. 11. WT4603<br />Surface Planer<br />Tungsten carbide is a sintered compound. The fine grain powder from which the cutter will eventually will be made is compressed into a mould ( the ‘blank’ un-edged cutter required) under extremely high temperature (1500C) and pressure to form a solid block.<br />Tungsten does not flow – it retains a granular structure and will chip rather than deform if abused.<br />Department of Manufacturing & Operations Engineering<br />
  12. 12. Surface Planer<br />WT4603<br />Because if its brittle nature TC cutters require a more obtuse sharpness angle than the HSS cutters (more support for the cutting edge). <br />This makes it less satisfactory for cutting softwoods than HSS knives which can be ground to a more acute cutting angle.<br />Department of Manufacturing & Operations Engineering<br />
  13. 13. WT4603<br />Surface Planer<br />Department of Manufacturing & Operations Engineering<br />
  14. 14. WT4603<br />Knife Cutter geometry<br />Rake or Cutting angle<br />Angle created between the face of the cutting knife and the centre of the cutter block<br />Can have a wide range<br />Softwoods 27° to 35 °<br />Hardwoods 15° to 25 °<br />Department of Manufacturing & Operations Engineering<br />
  15. 15. WT4603<br />Knife Cutter Geometry<br />Bevel or Lip Angle<br />Angle formed to give the cutting edge<br />Minimum of usually 35°<br />Greater for tipped cutters<br />Department of Manufacturing & Operations Engineering<br />
  16. 16. WT4603<br />Knife Cutter Geometry<br />Clearance Angle<br />Angle formed between a line tangential to cutting circle and the bevel angle of the knife<br />Must be present<br />Has a bearing on the life of the cutting edge<br />Usually 10° to 15°<br />Department of Manufacturing & Operations Engineering<br />
  17. 17. WT4603<br />Knife Cutter Geometry<br />Peripheral Cutting Speed<br />A constant speed in the range of 35-45 m/s will give best results<br />Increase in speed may cause loss of dynamic balance due to vibrations<br />Poor finish<br />Increased noise levels<br />Department of Manufacturing & Operations Engineering<br />
  18. 18. WT4603<br />Pitch distance<br />Combination of a rotary cut and a linear feed will leave the surface of the material with a series of arcs on it called Curtate Trochoids<br />The pitch and depth of these arcs will determine how smooth the surface finish will be<br />Department of Manufacturing & Operations Engineering<br />
  19. 19. Department of Materials Science & Technology<br />University of Limerick<br />WT4603<br />Pitch Distance<br />2mm to 3mm for non obvious joinery and painted external work.<br />  <br />1mm to 1.5 mm for internal painted work.<br />0.5mm to 1mm for hardwood joinery and furniture.<br />Department of Manufacturing & Operations Engineering<br />
  20. 20. WT4603<br />Pitch Distance<br />The SI unit of time is the second , but the minute is acceptable.<br /> <br />Feed rate on wood working machines is expressed in metres per minute. (m/min)<br /> <br />The formula for the pitch of the cutter marks is given by:<br /> <br /> f<br /> p = -------<br />nR<br /> <br />where p = pitch of cutter mark<br /> f = feed rate<br /> <br />n = number of effective cutters<br /> <br /> R = revolutions per minute of block<br />Department of Manufacturing & Operations Engineering<br />
  21. 21. Pitch Distance<br />WT4603<br />The unit for “p” will be metres (m) <br /> <br /> <br />f m/min m min<br />p = ---- = --------- = ----- x ------ = m<br /> nR 1/min min 1<br />Department of Manufacturing & Operations Engineering<br />
  22. 22. WT4603<br />Pitch Distance<br />Problem 1<br /> Calculate the cutter pitch of a 4 cutter block revolving at 4200 rev/min with a feed speed of 24m/min.<br /> <br /> <br /> F 24 24<br />p = ------- = ------------ = --------- = 0.0014m = 1.4mm<br />nR 4 x 4200 16800<br />(Internal painted work)<br />Department of Manufacturing & Operations Engineering<br />
  23. 23. Pitch Distance<br />WT4603<br /> If a graded surface is specified and the machine has a multi-speed feed gearbox, the same formula is used but “f” is expressed in terms of n ,p, and R.<br /> <br /> <br /> f <br /> p = -------  f = nRp<br />nR<br />Department of Manufacturing & Operations Engineering<br />
  24. 24. Pitch Distance<br />Problem 2<br /> <br /> From a cutter block which rotates at 4200 rev/min and has two cutting knives, a surface finish of a 4mm pitch is required. At what speed should the feed gearbox be set.<br /> <br />f = nRp = 2 x 0.004 x 4200 = 33.6 m/min<br /> <br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  25. 25. WT4603<br />Chip formation<br />Department of Manufacturing & Operations Engineering<br />
  26. 26. WT4603<br />Riving<br />Department of Manufacturing & Operations Engineering<br />
  27. 27. Riving<br />WT4603<br />Cracking occurs below the cut depth<br />Department of Manufacturing & Operations Engineering<br />
  28. 28. WT4603<br />A<br />On the surface planer the in-feed table (A) acts as chip breaker and the downward pressure exerted by the operator also makes it act as the pressure bar.<br />Department of Manufacturing & Operations Engineering<br />
  29. 29. WT4603<br />Chip formation<br />Department of Manufacturing & Operations Engineering<br />
  30. 30. WT4603<br />Chip formation<br />Chip breaking aid and pressure bar prevent riving and splintering<br />Department of Manufacturing & Operations Engineering<br />
  31. 31. WT4603<br />Square cutter blocks<br />Department of Manufacturing & Operations Engineering<br />
  32. 32. WT4603<br />Square cutter blocks<br /><ul><li>Clamping bolts are in tension
  33. 33. Tension force increases with rotational speed
  34. 34. Will be ejected at failure</li></ul>Department of Manufacturing & Operations Engineering<br />
  35. 35. WT4603<br />Square cutter blocks<br />Clamping bolts are in tension<br />Department of Manufacturing & Operations Engineering<br />
  36. 36. WT4603<br />Circular cutter block<br />Clamping bolts are in tension<br />Department of Manufacturing & Operations Engineering<br />
  37. 37. WT4603<br />Circular cutter block<br /><ul><li>Reduced noise levels
  38. 38. Better balance
  39. 39. Safer clamping mechanism
  40. 40. Can run head at higher speeds (RPM)
  41. 41. Can produce better finish
  42. 42. Easier and quicker maintenance</li></ul>Department of Manufacturing & Operations Engineering<br />
  43. 43. WT4603<br />Knife clamping mechanism<br />Department of Manufacturing & Operations Engineering<br />
  44. 44. WT4603<br />Knife clamping mechanism<br />Department of Manufacturing & Operations Engineering<br />
  45. 45. WT4603<br />Knife clamping mechanism<br />Department of Manufacturing & Operations Engineering<br />
  46. 46. Cutter projection<br />WT4603<br />Round form tool with limited cutter projection<br />Department of Manufacturing & Operations Engineering<br />
  47. 47. Cutter projection<br />WT4603<br />Use of a limiter to achieve limited cutter projection<br />Department of Manufacturing & Operations Engineering<br />
  48. 48. Cutter design<br />WT4603<br />Cutters should preferably be designed to be used in dimensionally similar pairs, formed to the same profile. <br />Pairs should be mounted directly opposite one another. The manufacturer should ensure that instructions on balancing the pairs of cutters after grinding are given to the user.<br />Department of Manufacturing & Operations Engineering<br />
  49. 49. Cutter projection<br />WT4603<br />The design of cutter blocks should, as far as is practicable, be such as to prevent excessive cutter projection. <br />Where the mounting arrangement permits projection which could subject the cutter to unsafe stresses, the maximum permissible projection for given cutter types should be specified in the user’s instructions.<br />Department of Manufacturing & Operations Engineering<br />
  50. 50. Hand-fed machines<br />WT4603<br />For machines designed for hand-fed operations, where cutters are necessarily exposed, the use of chip limiting cutters should be recommended <br />For other hand and semi-mechanical feed operations, cutter blocks should have as little cutter projection as is practicable.<br />Department of Manufacturing & Operations Engineering<br />
  51. 51. WT4603<br />Surface Planer<br />Cutter and Machine Maintenance<br /> <br />Involves:<br /> <br />Grinding and setting of knives<br /> <br />Roller and pressure bar setting<br /> <br />Prevention of resin build up on table and rollers.<br /> <br />Attention to: bearing wear<br /> feed complex adjustments<br /> rise and fall table<br />Department of Manufacturing & Operations Engineering<br />
  52. 52. Surface Planer<br />WT4603<br />The grinding angle of a cutter can vary between 30 to 35<br />This is increased to 40 for hardwoods (cutting edge lasts longer)<br />Department of Manufacturing & Operations Engineering<br />
  53. 53. WT4603<br />Surface Planer<br />Overheating<br /> <br />May produce micro cracks in the cutting edge which can run into gaps when the cutter is used.<br />May cause the cutter to bow due to expansion.<br />Department of Manufacturing & Operations Engineering<br />
  54. 54. WT4603<br />Surface Planer<br />Overheating can be avoided<br />By taking light cuts.<br />By ensuring that the grind wheel is ‘dressed’ when required to ensure that the face is open and not glazed when grinding the knives.<br />By using a ‘soft’ grinding wheel on HSS cutters – the soft structure of the wheel allows its grains to break away as soon as they are blunt revealing sharper ones.<br />By wet grinding – this is the grinding of cutters while partially submerged in a mixture of water and soluble oil. The water is a coolant to prevent frictional heat developing and to disperse it should it occur. The oil prevents rust in the cutters and it provides a degree of cutting lubrication.<br />Department of Manufacturing & Operations Engineering<br />
  55. 55. WT4603<br />Surface Planer<br />Setting Cutters in Block <br />Before setting the following points should be checked.<br /> <br />The out feed table and cutter block must be clean and free from dust resin.<br /> <br />Method of adjusting cutters.<br />Area where setting device is used from should be free from resin and damage.<br />Straightness of cutters.<br />Cutters correctly balanced both in weight and end for end.<br />Department of Manufacturing & Operations Engineering<br />
  56. 56. WT4603<br />Surface Planer<br />Setting devices<br />There are a number of cutter setting devices.<br />This device and procedure will often be supplied with the machine.<br />They can be loosely placed into the following four categories:<br /> <br />Bridge device<br /> <br />Precision cutter setter device<br /> <br />Pin locater device<br /> <br />Wooden straight edge device<br /> <br />Cutters require accurate setting in the block because if the knives are not revolving in the same cutting circle a poor finish will be produced.<br />Department of Manufacturing & Operations Engineering<br />
  57. 57. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  58. 58. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  59. 59. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  60. 60. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  61. 61. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  62. 62. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  63. 63. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  64. 64. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  65. 65. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  66. 66. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  67. 67. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  68. 68. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  69. 69. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  70. 70. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  71. 71. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  72. 72. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  73. 73. WT4603<br />Surface Planing<br />Department of Manufacturing & Operations Engineering<br />
  74. 74. WT4603<br />Setting Planer Knives<br />When planing wooden material a number of factors combine to generate the flat surface.<br />Number of cutting knives in the block<br />Speed of the revolving block<br />Feed speed of the material<br />Knife cutter design<br />Chip breaking aids<br />Nature and species of the material<br />Department of Manufacturing & Operations Engineering<br />
  75. 75. Knife cutter design & Chip breaking aids<br />These factors combine to produce an acceptable surface finish<br />Tip of the cutter splits away the chip<br />The chip is forced away from the stock and up along the face of the cutter which is exerting a tearing effect on the grain fibre<br />As the knife exits the stock the chip is either cut or will “rive” or tear deeply along the grain line and lift as a long heavy splinter<br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  76. 76. Knife cutter design & Chip breaking aids<br />The cutter projection and the shape of the block face cause the severed chip to bend back causing a crack across its width<br />This makes long grain riving less likely<br />(Chip breaker not shown)<br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  77. 77. WT4603<br />Knife cutter design & Chip breaking aids<br />Sharp tooling (a) will aid in the chip bending back and cracking across its width<br />Blunt tooling (b) will aid riving<br />Department of Manufacturing & Operations Engineering<br />
  78. 78. WT4603<br />Chip Formation<br />Before knife makes its cut<br />Department of Manufacturing & Operations Engineering<br />
  79. 79. WT4603<br />Chip Formation<br />Chip to be formed<br />Department of Manufacturing & Operations Engineering<br />
  80. 80. WT4603<br />Chip Formation<br />a<br />Chip breaker will help prevent riving (a)<br />Department of Manufacturing & Operations Engineering<br />
  81. 81. WT4603<br />Knife cutter design & Chip breaking aids<br /> Large cutting angle which gives the knife a lifting action which will cause riving<br />Grinding a face bevel reduces the risk of riving as it changes the cutting angle<br />Department of Manufacturing & Operations Engineering<br />
  82. 82. WT4603<br />Face bevel on cutter knife (B)<br />Department of Manufacturing & Operations Engineering<br />
  83. 83. WT4603<br />Setting Cutter Knives<br />Setting of knives will greatly depend on the type of cutter block<br />Knife cutter projection<br />Chip breaker<br />Knife parallel to table<br />All knives in the same peripheral cutting circle<br />(Refer to machine manual for setting)<br />Department of Manufacturing & Operations Engineering<br />
  84. 84. WT4603<br />Process Sheet Example:Double Mortise and Tenon<br />Department of Manufacturing & Operations Engineering<br />
  85. 85. Marking Out<br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  86. 86. Marking out:<br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  87. 87. Cutting 1<br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  88. 88. Cutting 2<br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  89. 89. Completed Joint<br />WT4603<br />Department of Manufacturing & Operations Engineering<br />
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×