Sharpening planing knives requires not only manual skills but also a good wet grinding machine. With freehand sanding, it is next to impossible to get a satisfactory result. Depending on the degree of wear and tear and possible damage to the blade, having it sharpened or exchanged is often the better option.
Estimate the need for grinding
Since the sharpening and sharpening of a planing knife in specialist companies is not very costly and time-consuming, it is rarely worthwhile to sharpen it yourself for normal household use. With regular planing work and, if necessary, the frequent use of other tools with blades, purchasing a wet grinding machine can be worthwhile.
- Also read - Changing the planer knife on the electric planer
- Also read - Have planing knives sharpened by post
- Also read - Adjusting the planing knife with the setting gauge
In principle, sharpening with two grit sizes on the electric wet grinder is sufficient to make the planer knives ready for use again. A special grinding device allows the planer knife to be clamped in the desired number of degrees. There are separate devices for planer knives and more universally applicable variants in which other straight blades can also be clamped.
In order to create a perfect grind that enables the sharpness of a razor on the planer knife, a second fine grinding step on Japanese water stones is recommended. For this, in turn, a grinding aid device is required that enables the required and precise grinding angle.
Instructions on how to proceed when sharpening a planer knife
- 800 and 4000 grit grinding wheels
- Japanese water stones 800 and 8000 grit
- Wet grinding machine such. B. Tormek
- Grinding device for planer knives or
- Universal grinding device
- Grinding aid on casters like Richard Kell
1. Remove the planer knife
Completely dismantle the planer knife and remove all brackets, screws and other components until you are holding the smooth iron in your hand.
2. Color bevels
Color the bevels, i.e. the bevels to be ground on the blade, black on both sides with a felt pen. This will later show you whether you have "caught " the entire course of the blade evenly.
3. Clamp and align
Clamp the planer knife in accordance with the design of the grinding device. The right degree setting depends on the pre-sharpening of the planer knife, but is usually 25 degrees.
4th. Fill the water tank
Fill the water tank of your wet grinding machine as soon as possible before use.
5. Rough grinding
Start the machine and first sand with the coarser grit (800). When the felt-tip pen color has worn off evenly, renew the color and sand with 4000 grit.
6th. Prepare water stones
Prepare the Japanese water stones according to the instructions for use. Provide a non-slip surface. For example, the back of a car mat works well.
7th. Clamp the knife in the sharpening aid
Clamp the planer knife into the rollable sharpening aid and set the angle about five degrees higher than that of the wet grinder.
8th. Fine sharpening
Pull the bevels of the planer knife evenly, first over the 800 and then over the 8000 stone.Tips & Tricks Don't forget to empty the water tank on your wet grinding machine after grinding. If the water stays in the tank, the grinding wheels will suck up and develop imbalances. ",