When to Use 5/8” & 7/8” Wheels | DeWalt 20V Angle Grinder Review

dragging out an extension cord every time we need a grinder can get annoying

and when you need to use a grinder far away from the power source a plug and style is not an option

this DeWalt cordless grinder is perfect for those quick jobs in the shop and for areas you don't

have a place to plug into cord there are two main things I see people get confused about when using

this tool first this DeWalt 20 volt cordless angle grinder is used for cutting and shaping

metal and concrete it is often confused for an automotive buffer that is used to buff

paint this grinder is not for buffing paint unless you want to completely remove the paint

to weld on the metal from making a repair second there's a big debate this grinder has a 5/8 or

7/8 inch arbor which will determine the size of grinding wheels you use the arbor is a part that

supports the grinding wheels when you pull the nut off you'll see a washer with a step on it

this is the arbor the arbor holds the grinding wheel flat and the step goes into the hole on

the grinding wheel to keep it centered as it's spinning so the grinding wheel does not wobble

it's important to have the correct size hole in the grinding wheel because it's not safe if it's

not secured correctly on this grinder the step of the arbor is 7/8 of an inch and the threads

in the nut are 5/8 of an inch both the step and threads can be referred to as arbor and an easy

way to figure out what size arbor you need depends on how the blade will be secured to the grinder

if you are using a grinder's nut to secure the blade you will use a grinding wheel for a 7/8

inch arbor when you screw it down it will sit flush to the washer and is stepper go inside

the center of the hole of the grinding wheel if you're using an attachment that threads onto the

grinder's arbor then you'll use an attachment with 5/8 inch threads when you screw it down

it will sit flush against the bottom of the thread it will not touch a flat washer you

will not use a nut when the attachment threads onto the grinder to recap you'll use 7/8 inch

when a grinder's nut secures the blade you'll use 5/8 inch when you thread on an attachment

the grinding wheels and cut-off blades you can use come in a few different shapes and they all use a

nut to secure them to 7/8 inch arbor the maximum diameter blade can be four and a half inches

your grinding wheels are made for shaping metal and concrete they can be the thick disc like these

if you need to remove a lot of material or the sandpaper wheels like these if you just want to

remove the paint or need to smooth out the metal cut off blades are thin wheels like these that

are made for cutting through metal or concrete attachments that thread onto the grinder use the

5/8 inch threads also have a maximum diameter four and a half inches these are normally a wire wheel

brush which is mostly used for cleaning metal to get the paint and the rust off now going back to

the grinding wheels and cutoff blades that use a 7/8 inch arbor and a nut to hold them on this nut

is different than most grinders since it has a spring in the center piece so it holds the blade

on better than a regular nut this means you don't need a hex key tool every time you change a blade

the only time i needed a hex key tool to remove the blade so it tightened it too much i couldn't

get it off I normally use my fingers to tighten the nut to remove it I'll grab the blade to spin

it backwards to start loosening it then spin the nut off either way when you tighten and loosen

the blades the button on the back of the grinder needs to be held down so the motor doesn't spin

the grinder has three main safety features it has a brake built into the motor so the blade stops

spinning two seconds after you let go of the trigger this keeps the grinder from taking off

across the room when you set it down so the blade isn't spinning after you're done using it the

kickback protection works on the brake to stop the motor if the blade becomes pinched so the grinder

doesn't jump back at you after using other brands of cordless grinders in the job site I've realized

that DeWalt has a kickback protection dialed in it doesn't cut out too soon and stop you from cutting

when a blade is not pinched for example I was cutting some big rusted bolts with another brand

of grinder and grinder kept stopping and took me forever to get through the bolt at first I

thought it was dead battery when i went to change it i found it was fully charged then it went to

my truck to get this DeWalt grinder and was able to cut through the rest of the bolts with ease

and the third safety feature is to protect you from flying sparks the built-in guard can easily

be adjusted so you can get into weird angles and make a cut without sending a shower of sparks back

at yourself to adjust the guard push down in a lever spin the guard then let go of the lever to

lock the guard in place the grinder can be used with a right or left hand and a side support

handle can go on either side so you can use two hands to keep the grinder from jumping around

this cordless 20 volt grinder can run any device 20 volt batteries along with the

flex volt batteries the brushless motor has the power needed to spin the blade at 9000 rpm so you

can quickly make a cut grinders like these do not have a variable speed trigger so when you squeeze

the trigger you're getting the full power spinning at 9,000 rpms as you are deciding what battery to

use it'll depend on the job you need to perform this grinder uses 800 watts of power so a 5 amp

hour battery like this will last seven half minutes which is a lot of run time if you aren't

continuously using the grinder if you have a bigger jab a tackle the DeWalt 6 amp hour battery

will last nine consecutive minutes the flex volt battery will give you the most amount of run

time since they are the biggest battery the wall currently offers there are a couple options when

buying this grinder depending if you need just the tool or the battery and charger as well this

cordless angle grinder is a DeWalt dcg413 let me break down to the wall rights are part numbers the

d is for DeWalt c is for cordless and a g is for grinder then it lists a model number of the tool

the letters and numbers following the model number indicate if it's a bare tool or the type of kit it

comes in a bare tool will have a b at the end of it it does not come with a battery so it'll

come just like this and you'll use a battery you already own you can also buy this grinder in a

kit the kit comes with a grinder two six amp hour batteries a charger and a carrying case

you can find the links to this tool and a kit it comes in the description down below

once you start using this cordless angle grinder you'll be able to quickly tackle your next project

since you're not tied to an electrical outlet and you still have a lot of power