Recommend and angle grinder

[dent]

Old bosch blue 4 1/2 which I got from my late father in law. Given it some stick and it just keeps going. Got a makita cordless one - pretty gutless but gets you out of a hole

 

Sent from my SM-G900F using Arbtalk mobile app

 

Couple of people have recommended me the new brushless makita cordless as being able to compete with corded i think most the brushless are similar now

 

For corded though i would go metabo very good anti vibe on them and very heavy duty

[openspaceman]

 

BUT the reason 9 inch are rated at a lower speed is because of the increased forces that come with the increased rotating mass and to a lesser extent increased forces/ leverage on the shaft.

 

Yes but you need to consider any small part of the periphery of the disc, the centrifugal force on that particle is its mass times the rotation speed squared times the radius, so a particle on the edge of a 9" disc is under twice the force of a similar particle of a 4.5" disc at the same rotation speed.

 

I'd be quite happy to use a half worn 9" disc on a 4.5" grinder at home but wouldn't at work. Similarly I have out of date discs at home which I couldn't use at work.

[Arrozdoce]

makita GA4541CT01

Is the daddy!

1400w

Variable speed (which is right handy for things like wire wheels, flappy disks etc)

 

Not the cheapest, but by far the best.

Above recommendations of brands may be OK too, but most manufacturers make more than one tool that looks the same but can have quite different innards.

 

Check out AvE on the youtube, he's got some good unbiased tool reviews.

AvE is the man

 

I'm not the abuse type of user, and i think the main factor is how you use and how much time.

I find the bosh stuff a bit overprice. Metabo hilti and festool are very expensive, only if you use the tool all day professionally.

With that said sometimes is hard to find the long lasting stuff but still not much expensive which is what I usually look for.

I really like makita's and how smooth they are, means a lot for what I do. I had a couple of dewalts in a past, 5'' and 9'' and I prefer makita over them. I found them very different from dewalts, hitachis, bosh. They also have decent price and seems very reliable. Hitachi's are a bit cheaper but still good tools imo.

[markieg31]

Yeah my battery makita was one of the cheaper ones with brushes

 

Sent from my SM-G900F using Arbtalk mobile app

[cornish wood burner]

Yes but you need to consider any small part of the periphery of the disc, the centrifugal force on that particle is its mass times the rotation speed squared times the radius, so a particle on the edge of a 9" disc is under twice the force of a similar particle of a 4.5" disc at the same rotation speed.

 

I'd be quite happy to use a half worn 9" disc on a 4.5" grinder at home but wouldn't at work. Similarly I have out of date discs at home which I couldn't use at work.

Which is of course why they run a 9 inch at approx 1/2 rotational speed of a 4.5 inch.

The point I was getting at is in a 9 inch disc there are many more particles or mass /mm of radius so the centre needs to be stronger to take these forces. Shed the outer part of the disc then that leaves you with a stronger disc than an original 4.5 one.

[openspaceman]

Which is of course why they run a 9 inch at approx 1/2 rotational speed of a 4.5 inch.

The point I was getting at is in a 9 inch disc there are many more particles or mass /mm of radius so the centre needs to be stronger to take these forces. Shed the outer part of the disc then that leaves you with a stronger disc than an original 4.5 one.

 

Yes I take your point, I was just pointing out the physics. As the force goes up with the square of the rotation speed then the centre of the 9" will be under 1.4 times less stress than the same point on a wheel at twice the rpm.

[Woodworks]

Thanks All

 

Going to give a Metabo a whirl.

 

Always liked the look of their gear so time to try some.

[aspenarb]

makita GA4541CT01

Is the daddy!

1400w

Variable speed (which is right handy for things like wire wheels, flappy disks etc)

 

Not the cheapest, but by far the best.

Above recommendations of brands may be OK too, but most manufacturers make more than one tool that looks the same but can have quite different innards.

 

Check out AvE on the youtube, he's got some good unbiased tool reviews.

 

Well oiled beef hooked, that is the mother of all grinders and on my hit list. Never heard of variable speed angry grinders before, I have been using an air grinder turned down for the odd times I have not wanted a gazzillion rpm .

 

That grinder specs well Makita UK

 

[william127]

Couple of people have recommended me the new brushless makita cordless as being able to compete with corded i think most the brushless are similar now

 

For corded though i would go metabo very good anti vibe on them and very heavy duty

 

I have a makita corded 4.5 inch, makita corded 9 inch, brushed 18v cordless and brushless 18v cordless!

They all work fine, the brushless is a genuine alternative to a mains one, as long as you have a couple of 5 amp batteries! The brushed one is a great tool but mainly suited to odds and ends, trimming bolts, cutting over long screws, etc.

[Mortimer Firewood]

Bosch has stood up to my heavey handed abuse real well got the 18v grinder and that's great for light gauge stuff or a 240 lead for heavey duty can't go wrong IMO