To sharpen bonsai tools, what you need is an oilstone.
You have a sharpening rod which is slightly curved on one side and flat on the other side.
You need the emery rubber to help you cleaning up the tool before you start sharpening it.
Now you can choose between two sharpening methods. On the one hand the sharpening stone. The classic and most widespread method. I advise you the oil stone for scissors and grafting knives.
The other method is to use a tungsten carbide sharpener. This method is best for hard-shaped tools. The best example is the branch cutter and the knob cutter.
Oilstone should be soaked properly overnight.
That way there is water in the oilstone so that when you go to sharpen it, the water has not been drained away and the sharpening is done properly.
Before you start sharpening, make sure that the oilstone is flat. If it is a new oilstone, you should not worry about it. You just have to wet it.
If you have used it with other tools, maybe the surface is uneven.
Often, you will use another oilstone and rub on top of it to help flatten it.
What that also does for me is that while rubbing the oilstone on the second oilstone,I get a flat surface but it develops a nice sandy, a gritty film on the surface of the the sandstone.
Sharpening the bonsai scissors.
We have a flat edge and the outer edge of the bonsai scissors has an angle.
So when you sharpen it, you don’t sharpen the inside edge which is flat,
you sharpen the outside edge which is curved, which is the angled edge.
Make sure that you rub it flat on the sandstone so you get this edge correct.
When you’re sharpening a knife, for example, you actually have to give it a tilt so generally between 10 and 15-degree angle.
If you sharpen a knife regularly, you know that you have to have the angle at 10 to 15 degrees.
But when you are sharpening bonsai scissors, make sure that you have it flush to the sandstone and usually, you rub it in one direction, and usually, five to seven times is more than enough when you’re sharpening the stone.
Unless the bonsai scissors is very, very worn away and you have to give it serious sharpening.
Remember, clean strokes across the sandstone.Try not to juggle on it because often, when you’re pushing on the thing, you sometimes have a juggling motion on it.
Once you finish rubbing it on the sandstone, clean it with some WD40.
Wipe down the scissors with WD40 and wipe it, give it a clean, cleaning wipe with a microfiber cloth or cloth that you’re using.
Sharpening the branch cutter
When you’re sharpening the cutters, you use the sharpening rod or a sharpener tungsten carbide .
Remember the rod has got a curved surface on one side and a flat surface on the outside.
For the outer side of the cutters, the rounded edge of the cutters, use the flat surface so you get the edges smoothed out nicely.
then on the inside, you’ll have to use the curved surface of the rod.
And that ‘s how you sharpen your bonsai tools with the curved rod.
Best sharpening stone for begineer
Now we wanto to show how to sharpen biting bonsai tools like concave and knob cutters using a tungsten carbide sharpener.
This is a great tool to sharpen your concave cutters and knob cutters. Shears too .
Here is a sharpening tungsten carbide. It is easy to use. It is cheap and you can store it anywhere. I like it because it doesn’t need preparation or water. Just hold tight.
Use the corner to sharpen the concave cutter and knob cutter so it’s sharpened inside
You hold this corner and then scrape it down. You must work only in one direction.
1. File inside bevel edge from center to tip four or five times. With only four or five scrapes you can see the line that is rather sharpenned.
You want to stay flat the surface inside to mantein the original one, so you work only inside with de tungsten corner.
You got the blade surface above to the up side, scrape it just get rid of the burr.
2.File flat back side of blade only one or two times to remove possible burrs, though you might have to do the inside a little bit longer.
That’s about it that’s how you sharp the concave cutter and knob correctly.