I have sharpen chainsaw chains almost daily for over 11 years now. Its part of my job. Most .325 but Also a bit 3/8 hobby and 3/8. Untill the very last days I have always used a vice indoors. Just a round file and a raker guide. Switched chain outdoors if necesary. Last year and a half the Husqvarna sp 33g chain ( x cut) witch I consider the best .325 chain so far. Mostly vallorbe round files. Always Two files first 3-4 strokes with a regulary file, then 3-4 light strokes with the vallorbe file. In this way the good vallorbe files last much longer. For the .325 I use 4,8 mm and after a while I use 4,5 mm. Always two hands on the file, one on the handle and one on the tipp.
One thing that have irretated me is that I have not ben abel to file outdoors without a stump vice or indoors without a vice. So I decided to try a new method that I saw on youtube and a tips on a forum. So far I have only practised indoors and the result have not ben tryed out but will soon.
This is how I do it. I am sitting on a chair. The SAW resting on my left thigh holding the saw with my left arm and stabelizing the tooth with my left hand thumb, outside of the thumb. The leg that the SAW is resting on, have I placed on top of something about 10 cm/4 inches high so that the thigh tilt about 30 Degrees or so. Then I file with my right hand, using only one hand.
For the other side its exactly the same only that the SAW is resting on my right thigh, holding IT with my right arm but there is one difference I stabelize the tooth with my right hand pointing finger, filing with my left hand. I am right handed.
As mentioned before I have not tried the result on logging so far, logging mostly sitka spruce, free standing with mostly a lot of branches.
Think the teeths look the same as they did before when using a vice and two hands. Angles is much easier to check when holding the saw in your lap, than when attached into a vise. The rakers can be done in the same way. Annyone Else filing this way or has some viewpoint about it?