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Sewing Scissors |
Scissor parts |
Sectional view of the cutting blade |
Scissors are sharpened according to the angles shown below.
Some scissors have differing angles for the Thumb Blade (shown in red on the picture below) vs. the Fingers Blade (shown in blue on the picture below). In those cases, separate angles are shown in the table below.
The picture to the right shows a sectional view of the cutting blade.
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Beautiful things come together one stitch at a time. Anonymous |
Sewing scissors get used on cloth which could easily be messed up badly if any leftover materials from the sharpening are not removed. Either acetone or isopropyl alcohol is recommended for cleaning the blade after honing.
It is also worth advising the user that such treatment is worth considering before use.
SC-60 scissors jig
SVX-150 scissors jig
The Tormek SC-60 Scissors jig is the best to use for these. The Tormek SVX-150 Scissors jig will also work well.
When sharpening scissors, use the vertical position with the grindstone rotating towards the blade. This keeps the SC-60 or SVX-150 properly aligned to the grindstone. (If you use the horizontal position, the grindstone will pull the scissors away from the jig.)
However, if you are sharpening left-handed scissors and they cannot be disassembled into the two pieces, you will need to sharpen from the horizontal position as the piece not being sharpened would interfere with the process otherwise (it would hit the Tormek machine).
Use of diamond grinding wheels is generally not recommended. The sharpness of the angle for sharpening can damage the diamond wheel. (And the SG grindstone works quite well.)
That said, some scissors are made from very hard metals and a diamond grinding wheel may be necessary, especially if the sharpener will need to clean up a bad grind from before.
Scissors align correctly
Scissors with gap at the ends
Scissors with bottom blade too long
Scissors with top blade too long
After sharpening, if the tips of the of the scissors do not meet, the length of one or both blades should be shortened. The most commonly seen is in the second picture where there is simply a gap at the ends where they should meet.
The black lines in the bottom 3 pictures to the left outline (in a very exaggerated manner) the shape of the blades after the ends have been shortened.
This can generally be done on the same grinding wheel as the one used to sharpen the blade. The sharpener should also check to ensure there are no sharp edges on the backs of the blades which are raised by doing this. If this happens, those should be cleaned up.
Note to the sharpener: if the scissors are very high quality, you may want to talk with the owner before making any of these adjustments.
As you do this more often, you may find that you can identify this risk before starting the sharpening process. If so, it is best to secure approval before making any changes to what may be very beloved scissors (especially if they were handed down from a loved mother or grandmother).
Example icon
Sharpness scales (as shown in the grey icon to the left) are used to indicate the recommended sharpness for the blades noted above. You can click on any of the icons showing the sharpness scale and be redirected to the page describing this more. Lower numbers are duller; higher numbers sharper.
These are general recommendations; you will need to use your own judgment, based on the knive’s intended purpose.
