115mm vs 125mm Angle Grinder: Which Disc Size for Home Amateur Work?

Without hesitation, take the 125mm, the price difference is not big and with 115mm, the blade will be too short to cut something. Of course, 125 is not enough for everything, but it is much more universal, that's my opinion.

bobek5001 wrote:

Will a 125 disc fit a 115 angle?

It won't be because the shield will get in the way. You can't use 125 to 115, because the rotational speeds are different and the 125 disc fitted to 115 has a higher rotational speed and greater centrifugal forces act. And you can put on a 115 shield up to 125.
Get yourself a 125mm rotor.

And if you miss 10mm from the 115 blade you'll have about 3cm to cut. besides, a smaller disc wears out faster.
Anyway, why bother with such things.

bobek5001 wrote:

Well, but this is only a 5mm difference when cutting because you cut one side.
...

As much as or only 5mm
115 will cut a maximum of 1/2" pipe
125 will easily cut 3/4" pipe
And if you buy something that has a small head with a gear, you will also cut something thicker
A larger blade also cuts faster, and much more evenly.

For example, a green 115mm bosch with a cover comes with a 125mm disc (not that I recommend using it that way).
I recommend sanders with a soft start.

zdzisiek1979 wrote:

It won't be because the shield will get in the way. You can't use 125 for 115 because the rotational speeds are different and the 125 disc fitted to 115 has a higher rotational speed and greater centrifugal forces act. And you can put on a 115 shield up to 125.
Get yourself a 125mm rotor.

Zdzisiek don't write such nonsense my friend. Small discs with a diameter of 115-125 are designed for 11 thousand revolutions. With diameters of 180-230, revolutions of 6 thousand are used.
Even if it was as you write - you can avoid it if you have a grinder with speed control. You just need to practice cutting.
bean , buy a 125 preferably with speed control. I often use a 1mm thick blade to cut plastic. And here the speed control is important - otherwise you will melt the material at the cutting edge. You will see that when cutting, when you use the disc, always a few millimeters more in diameter makes a difference, you change the discs less often - you will cut more with one piece and you will cut thicker materials with "one cut"
The most important are: use the correct type of blade for the material being cut, use a guard when cutting and absolutely (!!!) wear good quality safety glasses when cutting or grinding. If you don't take care of safety at work - you will look like the one who walks in my avantar

Maybe he writes, I don't know, I haven't checked what are the differences in revolutions between 115 and 125. The fact of a big difference will not be, but I stick to the rules to be safe. Bosz green, I had the unpleasant pleasure of working on this equipment and I will say so much never in my life handy, not comfortable and in a word, great shit. If you need equipment for years, I recommend, from my experience, makite holds well in the hand, handy and comfortable. What matters is how you hold the equipment in your hand.

zdzisiek1979 wrote:

Maybe he writes, I don't know, I didn't check what are the differences in revolutions between 115 and 125.

If you haven't checked, don't write, because you will have a close meeting of the third degree with a forum moderator for such things :-)

As for Bosch - very good equipment. Only blue, professional and not green for amateurs. I use blue Bosch tools for work. GBH 2-24DSR I am 12 years old and it works flawlessly and I do a lot of electrical installations with it. Makes grooves in bricks and reinforced concrete like gold.

It is this one:


As for the grinder, a colleague may be interested in, for example, this one:

http://www.rtvagd.sklep.pl/bosch/gws_850_ce_47802.php5#nclid=d66bc4d8852ecab7f40ed0f38689170b

Maybe, but not necessarily, because Makita grinders are very good, not to mention Hilti equipment.

Hello. The power of the grinder is more important than the revolutions. For φ125mm discs, the power of the grinder is definitely above 800W, because with less power, the grinder heats up quickly and there is a large decrease in revolutions under load (especially when grinding). If the grinder is for φ115mm discs, then we assume that If up to 125mm, we assume φ125mm or smaller. Grinding machines for φ115mm discs are usually smaller in size and easier to hold in one hand, but we have less power. The choice of the manufacturer depends on the wealth of your pocket, but it is better to spend more money once than to buy every now and then a new grinder or run to the store with a complaint.

For amateur work over 800W? What for? Maybe suggest a 2kW grinder with a disc diameter of 230mm to your friend right away? I also disagree that power is more important than rpm. Nonsense.