pedestal grinders and other off-hand grinders session 6

Pedestal Grinders and Other Off-Hand Grinders

Session 6

Shop Tools and Techniques 2

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

Grinding Wheels

• Abrasive Particles that are held together by a glue-like material called the bond.

Shop Tools and Techniques 4

Grinding Wheels

• Abrasives either Natural Occurring or Synthetic

• Natural• Emery• Corundum• Flint• Garnet• Quartz• Diamond

Shop Tools and Techniques 5

Grinding Wheels

• Synthetic• Aluminum Oxide• Silicon Carbide• Zirconia-Aluminum Oxide• Boron Carbide• Ceramic Aluminum Oxide• Cubic Boron Nitride• Diamond

Shop Tools and Techniques 6

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

Grain Size•Grain Size determines the coarseness or fineness of the grinding wheel

Coarse Wheel Fine Wheel

•Ranges from 6 (very coarse) to 240 (very fine)

Shop Tools and Techniques 8

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

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

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

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

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

Shop Tools and Techniques 18

Pedestal Grinder

Shop Tools and Techniques 19

Pedestal Grinder

Shop Tools and Techniques 20

Pedestal Grinder

Shop Tools and Techniques 21

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 AccessoriesWheel Guard

Shop Tools and Techniques 26

Pedestal Grinder AccessoriesWhy 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

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

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

Turn Off Grinder

Shop Tools and Techniques 39

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

Remove Wheel Guard

Shop Tools and Techniques 45

Loosen Wheel Mounting Nut

Shop Tools and Techniques 46

Remove Wheel

Shop Tools and Techniques 47

Inspect Wheel For Damage

Shop Tools and Techniques 48

Mounting a Wheel1. 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

Mounting a Wheel8. 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

Clean Spindle Shaft

Shop Tools and Techniques 51

Ring Test Wheel

Shop Tools and Techniques 52

Replace Inner Washer

Shop Tools and Techniques 53

Install Wheel

Shop Tools and Techniques 54

Replace Outer Washer

Shop Tools and Techniques 55

Tighten Wheel Mounting Nut

DO NOT Over-tighten Nut!!

Shop Tools and Techniques 56

Rotate Wheel Manually

Shop Tools and Techniques 57

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

Remove Tag and Lock

Shop Tools and Techniques 62

Stand To Side And RestartGrinder

Shop Tools and Techniques 63

Dress Wheel

Shop Tools and Techniques 64

Other Grinders

Shop Tools and Techniques 65

Other Machines

Shop Tools and Techniques 66

The End!!

Shop Tools and Techniques 67

Shop Tools and Techniques 68