Archived:Metal Grinding Introduction
This is an archived version of a central metal grinding introduction
This introduction has neven been approved by the Managers and thus has never been used!
This page has not been approved yet its purpose is to eliminate redundancy when giving introductions for the 3 metal grinding tools
This page is INCOMPLETE and still missing some important information before it can be used as a resource. Please use the "Discussion" feature above or talk to one of the tutors if you would like to help improve it. Thanks!
This is the content required for an introduction to our bench grinder, rotary tool and dngle drinder - reading this does NOT replace the mandatory session with a tutor! It will make it a lot quicker though ;-)
Let's begin! First off, make sure you have read the machine's manual (see InfoBoxes).
Personal Safety
Due to the different dangers and health risks of the machines covered in this introduction, materials worked with and exposure time, the needed personal protection equipment varies:
Tool | |||||
---|---|---|---|---|---|
Rotary Tool | MANDATORY | optional | recommended dependent on workload and material |
recommended | optional |
Wet Stone Grinder | MANDATORY | optional | optional (but you might want to hear if some thing goes worng) Under discussion |
optional | MANDATORY |
Bench Grinder | MANDATORY | optional | recommended dependent on workload and material |
recommended | MANDATORY |
Disc Grinder | MANDATORY | MANDATORY | MANDATORY | recommended | MANDATORY |
Dangers | Precautions |
---|---|
generation of hot sparks that are expelled in varying directions |
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rapidly spinning exposed chuck & disk or bit |
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the workpiece heats up and stays hot for a while, overheating can ruin your hardening on tool steel |
|
sparks can fly far and deposit themselves as fine dust, metal dust can be a health hazard when inhaled and may be abrasive |
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aluminum can clog an abrasive wheel and cause it to overheat until it breaks | do not attempt to grind aluminum |
bench ginders: the workpiece can get caught on the wheel and get jerked from your hand |
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handheld grindes: possible kickback if the disc gets caught on the material |
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kickback |
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when cutting the disk can get clamped from the sides leading to kickback |
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cut-off wheels could shatter under (side) force |
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a disc that is off-center or loose is very dangerous |
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no prevention of turning on after loss & restoration of power (keine Anlaufsicherung) | if the power has been lost for whatever reason, always press the "off" button before restoring it! |
the blades you are sharpening become sharp... | do NOT test the sharpness with your finger or other body parts you want to remain intact |
Rotary Tool and Angle Grinder
- Don't use the chuck locking nub while the tool is still moving. It is not meant to be a break.
Wet Stone Grinding
- Before you start:
- Ensure the water trough is filled properly with cold water before you start to grind (there is a "MAX WATER LEVEL" sign). Be aware that the stone soakes up water, therefore you will probably have to refill the trough after a minute or so
- Tighten the knob on the front of the machine (turn it clockwise until the wheel begins to drive)
- Keep an eye on the water level during grinding. Refill if needed.
- Do NOT grind a blade with the stone being dry.
- Use the stone evenly. Do NOT grind pointy things that will leave grooves
- UNDER DISCUSSION: don't wear hearing protection so you can hear when some thing is going wrong
- When you are done:
- Remove the water. The stone is not supposed to be kept wet! (the trough can be detached from the machine)
- Disengage the drive system with the knob (turn it counter-clockwise) on the back of the machine.