I was inspired to make this angled parting blade holder after seeing something similar on the Tools and Mods website. It’s based on
the Norman Patent cylindrical tool post design and the idea of a positive rake angle came from the author of the Tools and Mods website.
The design has some disadvantages, such as:
The cylindrical column means you have to align the blade perpendicular to the lathe axis every single time you mount it. If anyone
has a suggestion on how alignment can be done more easily, I’d love to hear from them.
Because the blade sits at an angle, the height of the tip changes if you extend or retract the blade. This means you have to readjust
the height of the tool holder (and then of course you also have to make the blade perpendicular to the lathe axis again)
If you extend the blade too far, you won’t be able to lower the tool holder enough for the tip to be at the same height as the
lathe axis. The only way around this is to use a thinner compound slide, or replace the compound slide with some kind of spacer that’s
...But there are also advantages:
The 4.5 degree positive rake on the blade seems to make cutting much easier
The blade is held fairly close to the cylindrical column, so tilting forces on the carriage are minimized. This is especially true if
you use the Drilled and Milled compound rest bottom from Little Machine Shop.
Overall, I’m happy with the way it turned out, but I found it a bit complicated, requiring several machining operations. But then
again, that’s why we do this kind of thing, right?
Cutting the stock by hand took some time!
The main part of the tool holder after most machining operations are complete
Aluminum parting blade clamp view 1
Aluminum parting blade clamp view 2
Parting blade clamp and tool holder
Stainless steel tool post
All the components ready for assembly
Ready for mounting in lathe
This view shows how the blade clamp works. Note the clearance and pivot point in the upper right
Here you can see the blade clamp from the other end