We are using a threaded disc, rated at 13,000 rpm. The disc remains in tact and operates correctly until the operation is complete and the trigger is released. At that point the disc comes off the grinder and flies away from the grinder.
Yes the above is correct with the question "are the threads the right size." but it can also be because u are not slowing the grinder down before stopping it. if the grinder stopps to soon the disk will stay moving. so the disk will fly off. i had the same problem with a pnuematic grinder. sometimes it is the operaters fault not the tools.
" an object in motion aloways stays stays in motion till an outside force dissrupts it."
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If you use a nut, the arbor nut will not hold your grinding/cutting wheel properly and you'll use up threade the arbor nut needs to tighten. What you need is the clamping flange, Bosch part number 3603340501. If you have a tool repair center near you they may have one or can order you one. If not, you can get one on sites like www.ereplacementparts.com.
If there isn't an arbor nut holding the blade/disc on the grinder you have a disc with the threaded center built into it. While holding the arbor lock button down you have to turn the disc by hand until it breaks free and spins off. It may be on vary tight as it is a self-tightening thread so the disc won't come off while you use it.
Which ever way your grinder spins when turned on is the same direction the lock nut has to be turned to remove it. This makes sure it's self tightening when in use. More often than not they're right-tight, left-loose.
1 Check the grinder before you
begin. The newer discs on rotary grinders have patented buttons that
allow you to remove the disc without any tools. You may have one like
that. In models like this, there's usually a spot to depress and then
remove the disc.
2 Turn off the grinder before you
attempt to remove and change the disc on your rotary grinder. If it's
battery powered, put the grinder in lock position so you can't
accidentally turn it on. If it's electric, unplug the grinder from the
3 Look for a nut in the center of
the disc. This is a give away that you need to use your special wrench.
Sometimes the grinder comes with a tool necessary to loosen and remove
the nut. Other times you need to use a wrench.
4 Lock the wheel into place before
you begin. You can find a button or switch at the side or back that
allows you to do that. When you lock the wheel in place, the disc
remains still as you loosen the nut in the center.
5 Remove the nut in the center
with either the tool provided with the grinder or a shop tool and lift
the disc off your rotary grinder.
6Lift the disc off the rotary
grinder. If you have different discs, remember to check for the best
fit. Put the nut back on a different way for different discs. Check for a
rim and indentation on one side of the nut and a flat side on the
other. A visual inspection of the disc for the rotary grinder gives you
information about the side to use.
Here is a diagram of your grinder and the tool you are looking for is number 50...
On the silver part on top of the grinder is a button , press this button and hold it down. now turn the blade until it stops moving, this locks the blade, keep holding the button down and turn grinder over ,and turn the nut counter clockwise, and remove it , take old blade off ,put on new one .it should go over the shaft and at the bottom on a "fit" Make sure it is on the "fit". replace the nut and tighten. If you dont get the nut tight enough it will loosen while in use and the disc you are cutting/grinding with will wobble and may even come off causing possible injury .
there are 3 problems you might face:
1. mechanical - disc shield (or protector) is too small for bigger disc. You can remove the shield (I do not recommend!!!) or buy bigger one (as I've did).
2. RPMs - on each disc you can find maximal speed of ourter part of the disc. It depends on disc diameter and RPMs. In case yo go from 115 to 125 at 11 000 RPM, it should be still OK. But I would not go further. Check how RPMs drops with increasing disc diameter.
3. motor overload. To handle bigger discs motor should produce higher torque. But if you are not pressing on the grinder and you frequently check temperature of grinder, it should work.
I have Metabo WE14-125 - 1400W motor 125 mm disc:
1. I've bought new shield from WE14-150 - it fits perfectly
2. My grinder has adjustable RPMs, when I'm using 150 mm disc I'm not going over level 3 (out of 6) to keep RPM in safe range for the disc.
3. Metabo makes also WE14-150 which is almost same as mine, but produces more torque (3,5Nm vs 3,3Nm). But the dofference is very small so I'm not worried.
Do you have the securing nut on the correct way? Basically the inner
surface of the nut needs to be flat against the blade for it to work
correctly and hold the cutting disc in place Usually the nuts are
reversible to fit either flat discs or rounded disc heads. It's either
that or you do not have the right size bore on the diamond disc for