On this page you will find instruction on how to keep your BrushDestructor-Blade sharp. It is the sharp teeth that really make the BrushDestructor-Blade so effective and maintaining the teeth on your BrushDestructor-Blade is what will give you the most effective, easiest clearing and maintenance of your property. I recommend that you learn how to quickly keep your teeth sharp and give them a quick touch up each time you refuel your WhipperSnipper, WeedEater, Brushcutter.
Model-20 to 22
Using the new sharpening jig, that gives you six steps of major sharpening, to give you the maximum life from your blade. After removing the three blades from your BrushDestructor Blade, follow these instructions.
1 – Inspect all three blades, to see which one shows the most damage or wear and place on the top.
2 – Using one of the pivot bolts and the supplied spacer washer to the underside, bolt up all thee flail-blades as shown. But only do the bolt up hand tight, so that the pivot-bush can still rotate.
3 – Sand the top flail-blade, so that it will be easy to see the line of a marker pen.
4 – Rotate the three flail-blades, so that the back edge lines up.
5 – Sit the sharpening jig over the top of the flail-blades and shuffle from 1 to 6, by lining up the hex head of the bolt and the corresponding numbered edge to the back of the flail-blade. Until you can see enough of the top of the flail-blade, to cut a new main tooth.
6 – Then use a fine tip permanent marker to mark out the line of the new tooth, as you can see below.
7 – Then while ensuring the back edges of the flail-blades all line up, tighten up the bolt to lock them together.
8 – Then using the diamond sharpening disc in an angle grinder clamped to a bench or vice, start grinding up to the line of the new tooth. Refer to videos at the bottom of this page showing sharpening the model-17 flail-blade while clamped together. This is very similar.
Note; Only sharpen in short burst and dunk the tip of the flail-blade into some water to keep the tip from getting too hot. If you over heat the grind area, the steel will lose it hardness and the tooth will no longer hold its sharp edge for any length of time.
9 – Below is the flail-blades after they have resharpened and rebalanced.
Below is a close up of the reground blade.
Model-17 to 22
This video shows you the best way, I have found to touch up and keep the teeth sharp on your Model-17 to 22 blades. This same process can be used with all the previous model BrushDestructor blades. Because I am clearing heavy bush, with large diameter saplings, I give the teeth a very quick touch up every time I refuel. This normally involvers one or two very light touches to the front face and one touch to the end face. If you are clearing heavy bush, I recommend that you do the same, with an angle grinder it takes less than 30 seconds. If you are clearing a long way from home, for many hours at a time, then a battery powered angle grinder would be money well spent.
This video shows how to do a major resharpen and rebalance, using the sharpening jig. After a number of touch ups, or an impact with a stone or star picket fence, the teeth will not be cutting evenly, which result in reduced cutting efficiency and vibration. The jig allows you to grind the teeth back to the optimum angles and get all three blades exactly the same without removing them from the hub. You will find that even when the flail-blades are ground back to the number three position, they will cut just as effectively as when they were brand new.
Model-16
This video shows you how to use the sharpening jig on the Model-16 blade to resharpen and balance after hard use or hitting hidden objects.
Model-15
This video shows how to touch up the teeth on the Model-15 Blade, but also look at the Model-17 video, you are more likely to get a more balanced blade.
Model-14
This video shows how to touch up the Model-14 blade, but again look at the Model-17 video, you are more likely to get a more balanced blade.
Model-11 Flail-Blades
On this page you will find instruction on how to keep your BrushDestructor-Blade sharp. It is the sharp teeth that really make the BrushDestructor-Blade so effective and maintaining the teeth on your BrushDestructor-Blade is what will give you the most effective, easiest clearing and maintenance of your property. I recommend that you learn how to quickly keep your teeth sharp and give them a quick touch up each time you refuel your WhipperSnipper, WeedEater, Brushcutter.
How to restore badly worn BrushDestructor Extra-Heavy-Duty Blades
In this video you will see a demonstration of how to restore badly worn teeth from the Extra-Heavy-Duty Flail-Blades. Refer instructions at the bottom of the page this page on how to disassemble and reassemble your BrushDestructor-Blade. To restore and re-balance your Flail-Blades, you need to bolt all three of them together using one of the bushes, washers, nuts and bolts so they become one. Once the bolt is done up really tight the three blades act as one, allowing you to sharpen as one.
- Then screw these blades to a piece of wood to allow you to fix in a vice or g-Clamp to a bench as shown in the video.
- Start by grinding the top edge to make what is left of the teeth more obvious.
- Then start grinding in the front face of the teeth, so they start to look like how they were when you first got them. Keep grinding in until the cut is about 5mm deep.
- If the end tooth looks like it could easily be broken off, then it is best to totally grind it off now and start developing a new tooth at the front. This is to prevent vibration issues in the field if one break’s off.
- Continue grinding the front and top edge until you get a sharp edge to each tooth.
- Clean up side edge of burrs to make it easier to see the shape and edge of the teeth.
- Continue touching up the new teeth until you are happy with them.
- Turn blades over and remove burrs from other side.
- All three blades are now sharp and balanced, ready for re-assembly.
Below are videos of how to sharpen the teeth on an Extra-Heavy-Duty BrushDestructor-Bade using an angle grinder and a Continuous Rim Tile Cutter diamond disc that is used for cutting ceramic tiles.
If you should happen to knock off some teeth or you start to notice some vibration after several sharpenings, you can resharpen and rebalance blades by unbolting blades from hub and using one of the bolts and several washers to bolt three blades together and sharpening as shown in video.
Instructions for removing and Replacing
BrushDestructor Flail-Blades
1 – Tools required – 1 x M6 metric Allen key and 1 x 13mm socket, spanner or shifter, pliers may be required to unscrew bushes.
2 – Remove blade from brush cutter, clean out bolt heads, sit on bench with one corner hanging over and insert allen key into bolt head.
3 – Undo and remove all lock nut, rotate around and repeat, then remove top hub.
4 – Remove all top washers, scrape away sludge build up on all washers using edge of other washers and unscrew bushes.
5 – Reassemble Existing Blades
- Turn over bush and screw in place to allow blade to run on unworn part of bush, place one washer over bush, turn over blade facing new teeth to outside and place three washers to the top side ensuring all washers are facing the same way.
- Replace top hub and then screw on existing lock nuts and tighten.
Reassemble with New Blades
- Take new bush supplied with new blades and screw in place, place one washer over bush, fit new blades and place three washers to the top side ensuring all washers are facing the same way.
Replace top hub and then screw on new lock nuts supplied with the new blades and tighten.
