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| Buksie:
Hi Guys I want to share with you how I made my tangential tool holders. I tried to keep the construction as simple as possible without compromising on rigidity and thereby avoiding chatter. It may be crude but I am very impressed with the performance of these tools, this is definitely the best time/effort investment I made to upgrade my cutting tools for my lathe. The tool holders were made up of two pieces of 16mm mild steel square bar, the part that the HSS tool is clamped onto, the tool block if I can call it that, has both the angles for cutting clearance machined on to it and when it is welded to the square bar shaft the cutting angles will automatically be correct.. As you can see from the photo below the groove that guides the HSS cutting tool is cut at 12 degrees from the vertical axis, leaning foreward. The side clearance angle is cut on the back top of the tool block about 10mm long and when it is clamped to the shaft for welding it will tilt the axis of the tool block by 12 degrees. I hope you understand my explanation. :doh: |
| mattinker:
That's a nice solution to the two 12° angles problem! Thanks, I'll use your idea, regards, Matthew |
| vtsteam:
Buksie, thanks for opening this thread and showing your tool holders. I made a quick change version. Like yours, my tool bit is held by a screw and washer. Unfortunately it tends to slip on occasion -- particularly on an interrupted cut. Do you find that happens with yours? |
| unc1esteve:
I also made a tangential tool. Here is a link to one that has a good fastening method. http://www.homemodelenginemachinist.com/f13/my-tangential-toolholder-17462/ The only problem I have is with the swarf. It comes off in one long, continuous ribbon. It wraps itself around everything, including my hand if I am not careful. All of the videos of a tool in action that I have watched show the same kind of stringy swarf. |
| vtsteam:
Thanks for the pix unclesteve maybe I'll try something similar. re. swarf -- I guess that's the tradeoff for simple sharpening and dual cutting directions -- no chipbreaker. I suppose you could maybe grind a hollow in with a Dremel mounted 1/4" grindstone behind both cutting edges, but then the idea of simple sharpening is no longer an advantage. Still, if it's not a problem for you, that might break the wire swarf up. Seems to me that this is one of those situations a carbide insert with built in chip breakers does well. In fact a diamond shaped insert mounted in a normal straight lathe tool holder might present the same face geometry as a tangential when the cutting angles and shape are similar to the tangential. Not sure of the required built-in insert shape exactly, but seems quite possible they are similar, hence a similar smooth cut. I guess in that case the term and concept of "tangential" tool holder should really only be applied to conventional lathe tools I might have a go at making an inserted qctp block that mimics tangential face angles. Have to think about this a little more..... |
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