Archived from the Tools In Action forum (Makita). This thread is read-only.
Came in today at work 🙂
The new 9 inch cordless grinder by Makita.
First impression was better then I Expected ! Much better balanced then a corded grinder. It’s a very strong tool. Really had to lean on it with my whole weight to get it to stall. In any normal use this thing will not bog down.
Any wording on Price?
Belgium prices so keep that in mind. € 329 ex.vat. for bare tool.
If you want to compare it to something else that’s around the price of a bare tool 18v X2 rotary hammer or the bare high torque impact wrench
Bosch disc? lol how’s the ass end of it seems like a weird battery set up
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Yeah we sell Bosch accessoires 😀 no Makita discs in the store ^^
It’s big 😛 but it really balanced the tool out. Gets Abit in the way when grinding.
But like most Makita grinders you can flip the head 90° if you like 🙂
niiiice.
More POWA ! Beast mode! Sweet ! Great pics ..and vid ,thanks..
hows does this compare to the 6 in flex grinder?
I would say @Jronman it slices the flex to shreds
It’s a different tool. 1 handed grinder vs a large 2 handed beast.
This looks like a huge fail.
Look at the difference compared to the corded model. The motor on that one is waaaay beefier.
700W for a 230mm angle grinder? Seriously?
kat wrote:
13 hours ago, kat said:This looks like a huge fail.
Look at the difference compared to the corded model. The motor on that one is waaaay beefier.
700W for a 230mm angle grinder? Seriously?
Your reply looks like a huge fail to me ?
Brushless DC motors are alot smaller and compact then universal AC motors. That’s 1 of the big selling points on brushless motors. Their power/size ratio.
No idea where you have found the ‘ 700 watts ‘ but it is around 2000 watts output. Thesame as many corded grinders.
It can’t put out 2000 watts, there’s no battery technology to support that kind of output yet.
At most they can discharge 20A per cell and at 36V that gives off 720W of power assuming no losses. But in the real world power transmission is not perfect so this grinder probably peaks at 600 watts max.
I like Makita tools, but let’s be realistic, this one is clearly inferior to any corded model. Brushless motors are mostly a marketing gimmick. In theory they should be 10-15% more efficient, but in practice no tool manufacturer made a brushless tool that is more powerful that the brushed counterpart and has the same weight/size.
Btw I have the DGA506 model and a cheap no-name $30 corded 115mm grinder, and the corded grinder is actually more powerful than the 125mm Makita. I can only cut thin material with the Makita, it’s almost useless
Are you trying to be an obvious troll or do you just have bad attitude ?
kat wrote:
1 hour ago, kat said:It can’t put out 2000 watts, there’s no battery technology to support that kind of output yet.
At most they can discharge 20A per cell and at 36V that gives off 720W of power assuming no losses. But in the real world power transmission is not perfect so this grinder probably peaks at 600 watts max.
There are a total of 20 cells in the two batteries. If they are 25A rated: 25A x 3.6V x 20 = 1800W.
kat wrote:
1 hour ago, kat said:Btw I have the DGA506 model and a cheap no-name $30 corded 115mm grinder, and the corded grinder is actually more powerful than the 125mm Makita. I can only cut thin material with the Makita, it’s almost useless
With the exception of the flexvolt grinder (and the newer twin 18V units coming out now), all cordless grinders have less power than basic electric units.
But there are many MANY people who think that the power and convenience delivered by the brushless grinders are extremely useful. Not for industrial grinding of course, but for construction work, absolutely.
dwain wrote:
45 minutes ago, dwain said:
Not for industrial grinding of course, but for construction work, absolutely.
Not for industrial grinding, said who ?
Im using an array of cordless grinder in my workshop doing heavy metal fab. My go to mainly is the FV grinder and makita x2 9″ now it’s out and have it
kat wrote:
16 hours ago, kat said:This looks like a huge fail.
Look at the difference compared to the corded model. The motor on that one is waaaay beefier.
700W for a 230mm angle grinder? Seriously?
Have you used the makita x2 9″ ?
This is no toy and puts out plenty of power
Makita_2233 wrote:
1 hour ago, Makita_2233 said:Not for industrial grinding, said who ?
I was excluding the flexvolt and x2 grinders in that post 😉
Makita_2233 wrote:
3 hours ago, Makita_2233 said:Have you used the makita x2 9″ ?
This is no toy and puts out plenty of power
Of course he hasn’t. He’s just trolling
dwain wrote:
3 hours ago, dwain said:
With the exception of the flexvolt grinder (and the newer twin 18V units coming out now), all cordless grinders have less power than basic electric units.
But there are many MANY people who think that the power and convenience delivered by the brushless grinders are extremely useful. Not for industrial grinding of course, but for construction work, absolutely.
And the new Bosh brushless with core battery.
The convenience, yes. The power? lol.
makita_2233 why don’t you make a youtube video and cut something thick with the DGA900 and then with a cheap 230mm grinder and shows which is the most powerful
kat wrote:
1 hour ago, kat said:The convenience, yes. The power? lol.
makita_2233 why don’t you make a youtube video and cut something thick with the DGA900 and then with a cheap 230mm grinder and shows which is the most powerful
You didn’t answer my question, do you have the x2 9″ ?
No I don’t use utube, but I have 15 years experience as a boilermaker/welder using a lot of different brand/size grinders. The grinder did not stop once in any of the cutting/grinding in my photos. The motor barely bogs down when leaning on it hard.
dwain wrote:
10 hours ago, dwain said:
I was excluding the flexvolt and x2 grinders in that post 😉
The makita 5″ is fine for all day use with a flap disc. I’ve had the fuel but get heaps of thermal overload of the batteries when pushed hard
kornomaniac wrote:
9 hours ago, kornomaniac said:And the new Bosh brushless with core battery.
And the new dewalt brushless 18v grinder. Pair it with a FV 9ah or the XR 20v max 6ah battery, it should run good. Plus the metabo brushless grinders and 7ah battery
Makita_2233 wrote:
2 hours ago, Makita_2233 said:The makita 5″ is fine for all day use with a flap disc. I’ve had the fuel but get heaps of thermal overload of the batteries when pushed hard
Good to know! And it’s all I need too. At the end of the day, it is a little below a regular 700W electric grinder in power, which is fine for heaps of people and applications.
I’m just saying that there a people who aren’t satisfied with a 700W grinder, and upgrade to a 1100W – 1500W 5″ grinder. These types (heavy industrial grinding) aren’t going to be satisfied with the regular 18V 5″.
Yep, the BL Bosch on a CORE battery was the first 18V unit I’ve used that was about equal to my basic 720W grinder at home. Hopefully the new Dewalt 18V/20V with FV battery will too. oztooltalk is going to review the Metabo 5″ with LiHD battery shortly, so I’ll know the answer to that question 🙂
The new Hitachi Multivolt grinder too, they claim 1270w of power
dwain wrote:
10 hours ago, dwain said:
I’m just saying that there a people who aren’t satisfied with a 700W grinder, and upgrade to a 1100W – 1500W 5″ grinder. These types (heavy industrial grinding) aren’t going to be satisfied with the regular 18V 5″.
The rpm on the fuel and makita is painfully slow when cuttung/grinding, good for a flap disc.
Check out the metabo 7″ bl 18v, its same size at the 5″
dwain wrote:
10 hours ago, dwain said:Hopefully the new Dewalt 18V/20V with FV battery will too.
The new dewalt grinder will get longer run with the 20v max XR6.0 with double row 20700 cells vs the FV 6.0. My dch293 gets more holes drill with the 20v max XR 6.0 than the FV 6.0. I’m only assuming at this point until I get the new dewalt grinder
Makita_2233 wrote:
12 hours ago, Makita_2233 said:The new dewalt grinder will get longer run with the 20v max XR6.0 with double row 20700 cells vs the FV 6.0. My dch293 gets more holes drill with the 20v max XR 6.0 than the FV 6.0. I’m only assuming at this point until I get the new dewalt grinder
Hmm interesting point. I don’t even know if we’re getting the 18V 6.0Ah battery in Australia, so I may never know 🙁
There’s an interesting relationship between current output (A), heat/resistance and runtime (Ah), and it’s one that I don’t think I’ll ever fully understand. Battery cell chemistry, who could understand it!?
I’ve picked up that 7″ 18V Metabo grinder, and you’re right, the body is the same as the 5″. Hope I get to review it some time ….
dwain wrote:
4 hours ago, dwain said:
Hmm interesting point. I don’t even know if we’re getting the 18V 6.0Ah battery in Australia, so I may never know 🙁
There’s an interesting relationship between current output (A), heat/resistance and runtime (Ah), and it’s one that I don’t think I’ll ever fully understand. Battery cell chemistry, who could understand it!?
I’ve picked up that 7″ 18V Metabo grinder, and you’re right, the body is the same as the 5″. Hope I get to review it some time ….
Dewalt were talking about the end of the year maybe but I have my doubts. They just released flexvolt kits with 18v tools and FV batteries. U.K. Doesn’t have the 18v 6.0 and we get what they get. I bought some in America, also a eBay seller in Melbourne importing and selling them here.
dwain wrote:
5 hours ago, dwain said:
There’s an interesting relationship between current output (A), heat/resistance and runtime (Ah), and it’s one that I don’t think I’ll ever fully understand. Battery cell chemistry, who could understand it!?
Looking at the XR 20v max 6.0 next to the FV 6ah you wouldn’t think you would get longer run time. Like you said who would understand it haha. Another reason why they may hold off bring the 18v 6.0 here they don’t want it competing with the FV 6.0
dwain wrote:
On 27.09.2017 at 12:35 AM, dwain said:
Hmm interesting point. I don’t even know if we’re getting the 18V 6.0Ah battery in Australia, so I may never know 🙁
There’s an interesting relationship between current output (A), heat/resistance and runtime (Ah), and it’s one that I don’t think I’ll ever fully understand. Battery cell chemistry, who could understand it!?
I’ve picked up that 7″ 18V Metabo grinder, and you’re right, the body is the same as the 5″. Hope I get to review it some time ….
Current output (power density) and energy density is a tradeoff in the first place, you can’t be very good at both. Runtime depends on both in a way, more capacity – more runtime is logical and correct, but at high loads (which tools are) internal resistance as an effect on runtime as well. Internal resistance decides how much Energy is wasted in the cell, and how much you can use. The power wasted in the cell grows at square to the current you draw (as power does), therefore the effect can get very considerable.
With 18650 cells the goal over the years was (at least we can assume from how the cells react) to get more capacity and not hurting the internal resistance too much (we know it is a tradeoff). So you can draw 30A for 5s from an 2009 1,5Ah cell and from an 2016 3Ah cell and get basicly the same. The voltage will drop according to the internal resistance and you will get similar power out, and heat up both batteries about the same. So, now you look at the datasheet and see, wait the 1,5Ah cell is rated at 30A continuous discharge, and the 3Ah cell at 15A. The reason beeing, the 1,5Ah cell is empty before it can get too hot. They can supply both similar currents – if you use it in a drill or an impact, but in an angle grinder you would send the batteries with 3Ah cells into thermal overload quickly.
So with 20700 (and 20650 and 21700) cells they went a new direction. They could use the bigger cells to lower internal resistance. Low internal resistance is very pleasant, you can get more current output, more power output and less wasted power due to heat. The first generation 20700 cells are the 3,1Ah Panasonic NCR20700A cells, featured in Metabo LiHD, DeWalt 18V 6Ah, FlexVolt 9Ah, Bosch Core/Eneracer and as we know these work an absolute dream. Continuous discharge rating is 32A with room for 40 or 50A overloads, no worries.
To get back to the FlexVolt 6.0 and XR 18V 6.0 comparison, DeWalt wanted to make an physically smaller 18650 version and the beast 20700 version of FlexVolt batteries. But the FlexVolt tools are very much high drain tools, and to avoid thermal issues they hat to go for a quite low energy 18650, a 2Ah cell. Samsung INR18650-20Rs Of course they may have been revised for extra % at internal resistance over the years, but the 20R is a quite old design still. Nothing really wrong using them, they are well chosen for the application and as we know with 18650 at those levels of power you can’t make a better choice. Now the XR 18V 6.0 (which is really a 6,2 Ah to be honest) are a few years newer and get you just very good power density and still good energy density, as you expect with the latest technology. As far as i know the internal resistance of 3 paralleled up 20Rs (FV) and 2 NCR20700 (XR6.0) should be similar, the XR6.0 has a slight capacity advantage – so the runtime is comparable. The advantage you get from the newer tech is the size in this instance.
And what does a third row of 20700s do to your runtime?
50% more capacity + lower internal resistance = over 100% more runtime.
EDIT: Oh and DeWalt, we do want the 18V XR 6.0 battery EXTREMLY bad here in europe, at least i do. Pleease make it happen 😮
^^ What a post! Thanks so much m.k.!
Lovely information indeed 😀 thank you 😀
m.k wrote:
5 hours ago, m.k said:
50% more capacity + lower internal resistance = over 100% more runtime.
EDIT: Oh and DeWalt, we do want the 18V XR 6.0 battery EXTREMLY bad here in europe, at least i do. Pleease make it happen 😮
Great post
I get more holes drilled on the dch293 20v max sds 28mm rotary with a 20v max XR 6.0 vs the FV 6.0
From memory I was getting 4 more diameter 18mm holes at 160mm deep vs the FV 6.0
dwain wrote:
8 hours ago, dwain said:^^ What a post! Thanks so much m.k.!
I have to thank you, for making OTT, I’m a big fan of the show. There are so much details covered in your reviews, please keep on doing them 🙂
You’re welcome m.k. Thanks for your support!