1. Pedestal Grinders and Other Off-Hand Grinders

2. Shop Tools and Techniques
Grinding
Grinding is the process of removing material by the cutting action of individual hard and sharp abrasive grains or particles of a revolving wheel as they come in contact with the surface to be ground.
Shop Tools and Techniques

3. Shop Tools and Techniques
Grinding Wheels
Abrasive Particles that are held together by a glue-like material called the bond.
Shop Tools and Techniques

4. Shop Tools and Techniques
Grinding Wheels
Abrasives either Natural Occurring or Synthetic
Natural
Emery
Corundum
Flint
Garnet
Quartz
Diamond
Shop Tools and Techniques

5. Shop Tools and Techniques
Grinding Wheels
Synthetic
Aluminum Oxide
Silicon Carbide
Zirconia-Aluminum Oxide
Boron Carbide
Ceramic Aluminum Oxide
Cubic Boron Nitride
Diamond
Shop Tools and Techniques

6. Shop Tools and Techniques
Grinding Wheels
Natural verses Synthetic
Synthetic Has replaced most naturally occurring abrasives
Superior Hardness
Durability
Controlled Grain size
Controlled Purity
Controlled Shape
Shop Tools and Techniques

7. Shop Tools and Techniques
Grain Size
Grain Size determines the coarseness or fineness of the grinding wheel
Ranges from 6 (very coarse) to 240 (very fine)
Coarse Wheel
Fine Wheel
Shop Tools and Techniques

8. Shop Tools and Techniques
Bond Types
Vitrified Bond
Most common (Clay or Feldspar)
Resinoid Bond
Synthetic resins
Rubber Bond
Flexible Bond
Metal Bond
Electrically conductive wheels
Shop Tools and Techniques

9. Shop Tools and Techniques
Grinding Wheel Grade
The degree of strength that a bond holds the abrasive grains in the bond setting.
Grade A
Softest
Grade Z
Hardest
Shop Tools and Techniques

10. Shop Tools and Techniques
Grinding Wheel Grade
The degree of strength that a bond holds the abrasive grains in the bond setting.
Hardness of Material
Hard Material – Soft Wheel
Area of Contact
Large Contact – Soft Wheel
Speed of Wheel
Higher Speed – Softer Wheel
Shop Tools and Techniques

11. Shop Tools and Techniques
Grinding Wheel Grade
The degree of strength that a bond holds the abrasive grains in the bond setting.
Machine Condition
Rigid Machine – Soft Wheel
Rate of Feed
High Rates – Hard Wheel
Operator Characteristics
Ram Rod – Hard Wheel
Shop Tools and Techniques

12. Grinding Wheel Structure
The structure of the grinding wheel is the space relationship of the grains and the bonding material to the voids that separate them.
Structure 0
Small Spacing
Structure 12
Larger Spacing
Shop Tools and Techniques

13. Grinding Wheel Structure
Grinding Wheels are fitted with paper blotters that act as cushions between the wheel and flanges holding them on.
Shop Tools and Techniques

14. Grinding Wheel Features
Abrasive Type
Aluminum Oxide, Silicon Carbide, CBN, Diamond
Grain Size
8 coarse to 240 very fine
Grade
A – Soft to Z – Hard
Structure
0 – Close to 12 - Open
Shop Tools and Techniques

15. Grinding Wheel Features
Bond Type
V – Vitrified S – Silicate B – Resinoid
R – Rubber E – Shellac M – Metal
Diameter
Width
Bushing Size
Shape
Shop Tools and Techniques

16. Grinding Wheel Manufacture
The methods used in the manufacturing of specific grinding wheels are dependent upon the individual abrasive grain, the bond to be utilized and the particular application that the abrasive will be used for.
Shop Tools and Techniques

17. Shop Tools and Techniques
Pedestal Grinder
The grinding wheels are mounted on a double-ended spindle and are held in place between two flanged disks
Typically, a roughing or coarse grained wheel is usually mounted on one end of the spindle and a fine wheel on the other.
A tool rest is provided for each wheel so that tools may be held or steadied while being ground
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Shop Tools and Techniques

18. Shop Tools and Techniques
Pedestal Grinder
Shop Tools and Techniques

19. Shop Tools and Techniques
Pedestal Grinder
Shop Tools and Techniques

20. Shop Tools and Techniques
Pedestal Grinder
Shop Tools and Techniques

21. Shop Tools and Techniques
Pedestal Grinders
Shop Tools and Techniques

22. Pedestal Grinder Bases
Shop Tools and Techniques

23. Pedestal Grinder Accessories
Rear exhausted dust collection unit
Shop Tools and Techniques

24. Pedestal Grinder Accessories
Quench Bath Cup
Shop Tools and Techniques

25. Pedestal Grinder Accessories
Wheel Guard
Shop Tools and Techniques

26. Pedestal Grinder Accessories
Why you need a Wheel Guard
Shop Tools and Techniques

27. Pedestal Grinder Accessories
Spark Guard
Shop Tools and Techniques

28. Pedestal Grinder Accessories
A tool rest is provided for each wheel so that tools may be held or steadied while being ground
Shop Tools and Techniques

29. Pedestal Grinder Accessories
Eye Shield and Work Light
Shop Tools and Techniques

30. Pedestal Grinder Accessories
Dressing Tools
Shop Tools and Techniques

31. Pedestal Grinder Accessories
Tool set for removing and mounting guards, rests, and etc.
Shop Tools and Techniques

32. Pedestal Grinder Accessories
Spindle nut wrench
Shop Tools and Techniques

33. Pedestal Grinder Accessories
Spark guard and tool rest setting gage
Shop Tools and Techniques

34. Pedestal Grinder Accessories
Lockout lock and tag
Shop Tools and Techniques

35. Pedestal Grinder Accessories
Lockout hasps
Shop Tools and Techniques

36. Shop Tools and Techniques
Dismounting A Wheel
1. Turn off grinder
2. Lock-out and Tag-out grinder
3. Disconnect exhaust collector
4. Loosen and relocate Eye shield
5. Loosen and relocate tool rest
6. Loosen and relocate spark guard
Shop Tools and Techniques

37. Shop Tools and Techniques
Dismounting A Wheel
7. Remove wheel guard
8. Loosen wheel mounting nut
Right hand threads on right side
Left hand threads on left side
9. Remove Wheel
10. Inspect wheel for damage
Discard damaged wheel
Shop Tools and Techniques

38. Shop Tools and Techniques
Turn Off Grinder
Shop Tools and Techniques

39. Shop Tools and Techniques
Lock-out And Tag-out
Shop Tools and Techniques

40. Disconnect Exhaust Collector
Shop Tools and Techniques

41. Loosen And Relocate Eye Shield
Shop Tools and Techniques

42. Loosen And Relocate Tool Rest
Shop Tools and Techniques

43. Loosen And Relocate Spark Guard
Shop Tools and Techniques

44. Shop Tools and Techniques
Remove Wheel Guard
Shop Tools and Techniques

45. Loosen Wheel Mounting Nut
Shop Tools and Techniques

46. Shop Tools and Techniques
Remove Wheel
Shop Tools and Techniques

47. Inspect Wheel For Damage
Shop Tools and Techniques

48. Shop Tools and Techniques
Mounting a Wheel
1. Clean Spindle shaft
2. Replace inner washer
3. Ring test wheel to mount
4. Install wheel on spindle
5. Replace outer washer
6. Tighten wheel mounting nut
7. Rotate wheel manually and observe
Shop Tools and Techniques

49. Shop Tools and Techniques
Mounting a Wheel
8. Replace wheel guard
9. Reconnect exhaust collector
10. Relocate and tighten tool rest
11. Relocate and tighten spark guard
12. Remove Tag and Lock
13. Stand to side and restart grinder
14. Dress wheel
Shop Tools and Techniques

50. Shop Tools and Techniques
Clean Spindle Shaft
Shop Tools and Techniques

51. Shop Tools and Techniques
Ring Test Wheel
Shop Tools and Techniques

52. Shop Tools and Techniques
Replace Inner Washer
Shop Tools and Techniques

53. Shop Tools and Techniques
Install Wheel
Shop Tools and Techniques

54. Shop Tools and Techniques
Replace Outer Washer
Shop Tools and Techniques

55. Tighten Wheel Mounting Nut
DO NOT Over-tighten Nut!!
Shop Tools and Techniques

56. Shop Tools and Techniques
Rotate Wheel Manually
Shop Tools and Techniques

57. DO NOT Over-tighten Nuts!!
Replace Wheel Guard
DO NOT Over-tighten Nuts!!
Shop Tools and Techniques

58. Reconnect Exhaust Collector
Shop Tools and Techniques

59. Relocate And Tighten Tool Rest
DO NOT Over-tighten Nuts!!
Shop Tools and Techniques

60. Relocate And Tighten Spark Guard
DO NOT Over-tighten Nuts!!
Shop Tools and Techniques

61. Shop Tools and Techniques
Remove Tag and Lock
Shop Tools and Techniques

62. Stand To Side And Restart Grinder
Shop Tools and Techniques

63. Shop Tools and Techniques
Dress Wheel
Shop Tools and Techniques

64. Shop Tools and Techniques
Other Grinders
Shop Tools and Techniques

65. Shop Tools and Techniques
Other Machines
Shop Tools and Techniques

66. Shop Tools and Techniques
The End!!
Shop Tools and Techniques

67. Shop Tools and Techniques

68. Shop Tools and Techniques