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How to attach a mortar raking starter kit

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Most mortar rakes are designed to fit onto the spindle of an angle grinder. Most mortar rakes are designed to fit onto the spindle of an angle grinder.

Before you begin

mains power supply

Step 1 – Turn off machine

Turn the power off and unplug the machine from the mains electrical supply.

angle grinder with disc highlighted

Step 2 – Remove disc

To fit a mortar rake starter kit to an angle grinder, you first need to remove the disc that is fitted onto the angle grinder

angle grinder being turned upside down To remove the disc, turn the power tool upside down and lay it on its back.
angle grinder labelled
lock nut wrench

Step 3 – Loosen lock nut

Use the lock nut wrench to undo/loosen the lock nut.

lock nut off

Step 4 – Remove lock nut

Once this is loosened, remove the lock nut.

depressed centre grinding wheel

Step 5 – Remove multi-disc

Now the lock nut is removed, you can take off the depressed centre grinding wheel/multi-disc.

inner flange

Step 6 – Remove inner flange

After this the inner flange can be removed

wheel guard on angle grinder Now you only have the spindle on the bearing box and the wheel guard, which you will need to remove.

Never use a disc in an angle grinder without a wheel guard!

angle grinder Your angle grinder will then be stripped back and you will be left with the spindle uncovered.

Do I need an adaptor?

spindle on an angle grinder You can buy mortar rakes that fit directly onto the spindle of the angle grinder or that need to go into an adaptor before screwing onto the spindle.

Installing an adaptor

The mortar rake adaptor attaches directly to the spindle. Twist the adaptor onto the spindle using a spanner to tighten the mortar rake on. Once you have screwed the adaptor onto the spindle insert the mortar rake into the adaptor and twist to tighten. You can also follow this through with a spanner.

Step 1 – Attach adaptor

The mortar rake adaptor attaches directly to the spindle.

Twist the adaptor onto the spindle using a spanner to tighten it on.

Once you have screwed the adaptor onto the spindle, insert the mortar rake into the adaptor and twist to tighten.

Attaching a mortar rake straight onto the spindle

using a spanner to tighten a mortar rake adaptor / rake to an angle grinder If the mortar rake is designed to fit directly onto the spindle, simply screw it on by hand, then tighten with a wrench.

Inserting the mortar raking starter kit

aluminium ring onto angle grinder

Step 1 – Insert aluminium ring

Place the adaptor/aluminium ring over the neck of the wheel guard collar

push the adaptor ring onto the guard collar of the angle grinder

Step 2 – Push ring down

Push the ring onto the guard collar of the angle grinder

   Most mortar rake starter kits will contain a choice of three aluminium rings that you can use to adapt the neck of the angle grinder so that it accommodates the sole plate—But DO NOT layer the rings as this will make the machinery UNSAFE!
sole plate added to aluminium ring

Step 3 – Push sole plate down

Making sure it is a snug fit, push the sole plate down over and onto the aluminium ring.

turning and twisting the sole plate onto the aluminium ring Turn the sole plate onto the aluminium ring until it is properly fitted.
allen key to tighten sole plate onto an angle grinder You can tighten the sole plate onto the aluminium ring with an Allen key – most mortar rake starter kits will provide one of these.

Setting the raking depth

sole plate depth 25mm The sole plate provides the opportunity to set the depth you will be raking to.

Some sole plates are already pre-set to a raking distance – though most let you adjust the depth yourself!

using an allen key to tighten the sole plate onto the angle grinder It is advisable to set the depth of the sole plate prior to attaching it to the angle grinder.

Follow the instructions on the starter kit in order to do this.

depth of sole plate If you want to check the depth of the sole plate once it is on the angle grinder,  measure the distance between the tip of the mortar rake and the flat square base of the sole plate.

This distance shows you the maximum distance you will be routing.

Attaching a dust extraction unit

dust extraction unit attaches to the sole plate outlet pipe Once the sole plate is attached, you need to insert the outlet pipe into a dust extraction unit. This fits over the top of the outlet pipe.
dust extraction unit A dust extraction unit is a form of industrial vacuum that is designed specifically for the removal of dust and debris created through building work.
turn the tool on Once all of this is set up you are ready to turn the tool on!
drilling into the wall a starter hole Remember – depending on the type of mortar rake you are using, you may have to make a starter hole in the mortar, into which you can guide the mortar rake.
Other types of mortar rake allow you to rout straight into the mortar—these mortar rakes tend to be steel bodied or solid tungsten carbide and have a larger diameter than longer length mortar rakes. They often have a tip designed to cut straight into the mortar. Other types of mortar rake allow you to rout straight into the mortar. These mortar rakes tend to be steel bodied and coated in tungsten carbide or solid tungsten carbide and have a larger diameter than longer length mortar rakes.

They often have a tip designed to cut straight into the mortar.