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Wednesday, 21 September 2016

Grinding Safety


Grinding Safety


Objective



Purpose of Grinding



Grinding wheel specification



Grinding wheel specification


Grinding wheel specification




Grinding wheel specification



Grinding wheel specification



How to prevent Breakage of Grinding wheel



How to prevent Breakage of Grinding wheel



Stopping the machine



Selection of grinding machine



Selection of grinding machine



Electrical safeguarding



Electrical safeguarding



Checklist for the abrasive wheel



Eyes



Grinding prohibited if



House keeping



Safe usage



Commonly used machines



Commonly used machines



Commonly used machines



Do and Dont



Do and Dont



Do and Dont



Do and Dont



Unprotected by guards and no work rest and or on/off switch


Unprotected by guards and no work rest and or on/off switch


Thank you







Welcome to

Grinding Safety

Purpose of Grinding

v To remove excess material from work piece to
   get required SIZE , FINISH and FORM
v To get the SURFACE  QUALITY requirements                  of work piece


What is a Grinding Wheel


A MULTIPOINT Cutting tool comprising  of selectively sized ABRASIVE GRAINS,held together by means of a BONDING MATERIAL called BOND with suitable SPACING of grains in between.


GRINDING WHEEL 

SPECIFICATION



How to prevent  Breakage of Grinding wheel


*Never mount a damaged grinding wheel.
*Don’t grind material for which the wheel is not designed.
*Never mount a grinding wheel on a machine not designed and guarded for that grinding wheel.
*Never over speed a grinding wheel.
*Failure to properly maintain a grinding machine can cause grinding wheel breakages resulting in serious injury or death.


*Improper mounting of grinding wheels.
*If you do not know how to use a grinding wheel or the grinder, get help!
*Jamming the work into the grinding wheel.
*Force grinding, so that the motor slows noticeably or the work gets hot.
*Grinding on the wrong surface of a grinding wheel



Stopping the machine


Switch off the machine and allows the wheel to stop completely before placing it on a bench or on the floor.

Selection of Grinding Machine


Select the proper grinding wheel and machine for the job.
Lock out and tag all machines before working on them.
Disconnect portable machines from their power source before
     changing the grinding wheel.
GRINDING WHEEL SPEED = >MACHINE SPEED.
Inspect the machine guard & check for speed of the machine(i.e., tachometer)
Clean arbor and flanges before mounting a grinding wheel.

* Check the mounting flanges for proper type, size, and flange
   condition. NEVER USE MISMATCHED, UNDERSIZE, DIRTY OR
   DAMAGED FLANGES.
* Use only machines designed and guarded for the grinding wheel
   you are using.
* Use proper mounting blotters when required or supplied by the  
   manufacturer.
* Do not reuse blotters and use only one blotter for each side of the 
   \ wheel.
* Care must be taken to ensure that all blotters are not allowed to
   “bunch up” or fold over and do not get caught inside the wheel’s 
   hole.
Electrical Safeguarding

CABLES!!!!!!
Loose lying cables can cause
a tripping hazard
electrocution
they are untidy
*Do not overload sockets.
*If a machine trip or an electrical cable become warm to the touch, it must be disconnected and reported without delay

Electrical Safeguarding



do carry out your own visual inspections of plugs and leads and get them repaired as necessary.
look out for:
physical damage to the cable
damage to the plugs
insecure connections to the plug
do switch off equipment before unplugging and before cleaning

Check list for the Abrasive wheel


EYES


Use face shield while grinding
Don’t rub your eyes if any foreign particles fall
Wash your eye with water
Check for poor vision


Grinding Prohibited If--


Only work on equipment / job if you are authorized to do so!



HOUSEKEEPING




SAFE USAGE


Commonly used machines
AG5 – 5 inches wheel
AG7 – 7 inches wheel
AG9 – 9 inches wheel


A5 Grinding machine
Wheel size  5 inches
No load speed  11000 RPM
Power  1400 watts
Current  8 Amps approx

A9 Grinding machine
Wheel size  9 inches
No load speed  6500 RPM
Power                      2400 Watts
Current                    13 Amps approx

A7 Grinding machine
Wheel size  7 inches
No load speed  8500 RPM
Power  2400 Watts
Current  13 Amps approx


*Fibre glass body tools –double insulated  - do not modify  socket
*Do not expose the machine to rain / wet condition
*Cable to be kept away from heat / oil /  sharp edges  and moving parts
*Do not carry the machine by holding the cord
*Use proper extension cords for out door work – ensure the  cable are rated properly
*Keep away from DA sets / thinner and paint to prevent fire from the sparks


UNPROTECTED BY GUARDS AND NO WORK REST AND ON/OFF SWITH 


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