Negative rake inserts need HP and rigidity to work the best, your machine should be able to use them to a point, but positive rake inserts work better and why they are usually recommended for hobby sized machines.
This document from Kennametal shows the different chip breakers for the negative and positive rake inserts. Negative rake inserts have straight sides and are used in tools that have a negative sloping seat so that the front side of the insert clears the work. This enables the insert to be double sided, so you have twice the cutting edges than a positive rake insert that only has cutting edges on one side. I use some negative rake inserts because I have them, but everything new I purchase is positive rake. As you can see from the table, there are a lot of choices depending on your cutting conditions. You don’t want an insert meant for roughing if you are taking finishing sized cuts.
David Best is a member here and wrote a book about the subject, it is available on Amazon I believe. If you do a search here, you should find some links to it. I don’t have it myself, but those that have purchased it speak highly of it.
This document from Kennametal shows the different chip breakers for the negative and positive rake inserts. Negative rake inserts have straight sides and are used in tools that have a negative sloping seat so that the front side of the insert clears the work. This enables the insert to be double sided, so you have twice the cutting edges than a positive rake insert that only has cutting edges on one side. I use some negative rake inserts because I have them, but everything new I purchase is positive rake. As you can see from the table, there are a lot of choices depending on your cutting conditions. You don’t want an insert meant for roughing if you are taking finishing sized cuts.
David Best is a member here and wrote a book about the subject, it is available on Amazon I believe. If you do a search here, you should find some links to it. I don’t have it myself, but those that have purchased it speak highly of it.