The most common angles used are 1:6 (approximately 10°) for softwoods, supposedly to compensate for the generally softer more squash able grain, and 1:8 (approximately 7°) for hardwoods.
Other angle ratios commonly used include 1:4 1:5 and 1:7.
In reality it doesn't really matter which angle you use, it's mostly down to which one looks most aesthetically pleasing.
There are lots of different dovetail marking guides on the market, ranging from simple and economical up to beautifully made but very expensive versions. You could use a sliding bevel gauge (see last months blog) or make your own guide using wood, plastic or metal!
The two different guides shown in the above photograph are made from aluminium by Canadian company Veritas, they cost around £8-£11 each.
Thats all for February, look out for next months blog.
Enjoy those pancakes 🥞