Welcome to the forum, Enrico. You will need a black Sharpie type marker and a small square. Blacken the bevel of your chisel and hand push or turn on your motor for just enough time to remove the marker. Remove the jig and examine the grinding marks with your square. If they look square, you are ready to go. If not, adjust the two knobs and repeat the test procedure. Do not proceed to full sharpening until you are square. Leaving out the testing lengthen your sharpening time and shortens your chisels. This procedure will soon go very quickly. Start with a chisel around 3/4" (19mm). It is an easier learning size.
This Tormek video shows an excellent tip. Here is a link:
https://www.youtube.com/live/8uLMWXqobRM?is=K6kMw3zHDeyxdIGW
Keep us posted.
Ken
This Tormek video shows an excellent tip. Here is a link:
https://www.youtube.com/live/8uLMWXqobRM?is=K6kMw3zHDeyxdIGW
Keep us posted.
Ken