Important Safety Rules for Using a Jig Grinder
A jig grinder is designed for grinding difficult holes and shapes that need the highest levels of accuracy and finish. It is similar to the jig borer, wherein the spindles and table positioning are very accurate (more accurate than a manual milling machine).
A jig grinder is often used by tool and die makers in making jigs and pegs on dies. There are a lot of peripheral elements to a big jig grinder, such as separate hydraulic motors, various cooling and air compressors. It works by means of a fast air spindle revolving a grinding bit.
Also Read: How to use a jig grinder for grinding bevels
The air spindles are interchangeable and removable to attain variable surface speeds. Some spindles are adjustable speed (30,000 up to 50,000 rpm), others are fixed speed (60,000 rpm). You can also find spindles with very high speed (175,000 rpm).
A standard X-Y table is found in most machines but some have knee travel. The indices of the axes is .0001" through a vernier scale, with better accuracy available by means of measuring bars.
The head of the machine has 2 vertical travels, one precise spindle adjustment and the other a rough head adjustment.
The spindle where the removable air spindle is fitted also revolves at a variable speed and can normally outfeed .100" while operating, with an accuracy of .0001" or greater on the handwheel.
A jig grinder that is well maintained will dependably position work to a higher level of accuracy than if you only had the handwheels. These features are very important in positioning a peg and hole system at a specific distance from a reference edge.
The most crucial consideration for a jig grinder is the dual-spindle structure. The main spindle is approximately located between 1" to 2" of travel while the .100" of outfeed is utilized during use of the machine outfeed into the work.
You may make use of a spacer bar between the main spindle and grinder, allowing large work (9 inch radius or more) to be accomplished. The main spindle has a lot of speed options to ensure that the appropriate rates for grinder feed are achieved.
Also Read: Guide to use jig grinder
Grinding tools and machines function with the help of abrasive wheels, running at high speeds. The sparks, flying debris and other hazards trigger concern for the user’s safety. So in line with this, it’s helpful to know some basic safety guidelines:
What are The Functions of Grinders?
There are three basic types of grinders:
Bench Grinder Safety
Hand Grinder Safety
Personal Protective Equipment
When using a grinder, you need to wear the proper PPE. A clear face shield or safety goggles are needed to protect the face and eyes. Leather welding gloves also come in handy to protect your hands. You can wear ear muffs and other hearing protection device as well.
It’s vital that you know the safety rules before using a jig grinder. Doing so ensures you and others around you are safe, and that your machine won’t get damaged from mis-use.