Finding The Best Angle While Grinding
What should be your angle while grinding? The answer can mean the difference between a sharp and a dull blade, among other results. The angle can also mean the difference between intact and injured limbs.
You have to exercise caution when choosing angle on any grinder. Your safety and performance partly rests on it. Here are tips that you can keep in mind when determining the angle of grinding. These tips can apply to both belt and angle grinders.
Working Angle While Grinding Differs
Each material and grinder will have different ideal angles for several reasons. You have to consider the type of material in relation to the grit level, for example. You should also factor in the desired results, such as in the roughing and finishing stage. In general, these tips apply:
Your angle is too flat if the wear pattern is 0.75-inch – go higher. Your angle is too high if the wear pattern is 0.25-inch – go lower. You can determine it by sight alone although your first tries may need a ruler.
You can set the angle with a protractor, too. You can determine whether you’re setting the work piece at the right angle easier and faster, too.
You will develop a feel for the right angle with practice. You can set aside the protractor and rely on your sight, as well as on other factors. You can, for example, see the spray pattern and amount.
Apply Consistent Pressure
You can still get inconsistent results even when you have found the right angle. One of the common reasons is inconsistent pressure on the work piece in relation to the belt or stone.
The best technique in grinding down a weld is to move the disc forward and backward. The angle should be 5 to 10 degrees horizontal. But the forward and backward motion can result in inconsistent pressure.
You may apply more pressure going forward and less pressure going backward. You will almost immediately see the results on the work piece and grinder. The excess pressure on the forward motion results in the glazing of the disc grains. Its edge can even turn an orange color.
The lighter pressure on the backstroke results in a chattering sound. It means the disc is bouncing off the material on the way back. The final result: You’re not removing weld material as much as expected. You’re wasting your time and energy on the job.
Always remember that constant pressure going backward and forward is essential in effective grinding. Your goal is to apply adequate pressure so that the disc’s grains perform their work. Otherwise, you’re doing your work wrong.
Maintain the Proper Distance
This distance is between the grinding belt/stone and the back of the blade, in case of a knife project. You have to maintain the proper distance between the two for best results. A few useful tips in this regard include:
You can start with a 126-grit belt followed by a 400-grit belt. Your finishing belt can be a lubricated and rouged worn-out belt for best results.
Take Advantage of the Slack Part
Belt grinder create a better finish than a hard wheel grinder. This is especially true when the slack part of the belt is used. You’re basically using the slack part between the tracking wheels and contact.
Tip: Hold down the edge while letting the belt run off the blade. This is applicable for a vertical-running belt on two wheel grinders.
The ideal angle for grinding is 5 to 10 degrees horizontal. You can determine the correct angle by using a protractor on a flat surface. Your eyes should be able to gauge the correct distance by then.
But the correct angle isn’t the be-all and end-all. You should also apply consistent pressure going forwards and backwards. You have to maintain the right distance between the work piece and belt, too.
A combination of knowledge and skills honed by education and training is a must here. You have to be patient in your trial-and-error experimentation. You can get the correct angle by sign soon enough.