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Mazda SkyActiv Diesel.

(via rodandcustomshow)




um, no… Porsche 924


"Emission Test at the National Environmental Research Center of Epa: the Ford Engine (Blue) with Ford’s Monolith-Honeycombed Catalytic Converter (Brass-Colored) Chevrolet Engine at Upper Right 09/1973." Photo by Tom Hubbard, courtesy U.S. National Archives on Flickr.

(via theoldiebutgoodie)

Asker kirkendauhl Asks:
Quick question: From your experience, which type of edge do you prefer on a knife for general use. The kind that's sharpened on one edge, or both. I think the technical term for it is beveled, but I'm not entirely sure.
ttopcoupe ttopcoupe Said:



It depends on the use.  Generally, the edge types will involve a trade off between sharpness and durability.

1) Hollow Grind, 
2) Flat Grind (AKA Scandi Grind)
3) Sabre Grind
4) Chisel Grind
5) Double bevel Grind
6) Convex Grind (AKA Axe Grind)

1 is the sharpest and least durable, 2 is a little less sharp, but a little more durable, and so on all the way to no. 6, which is the least sharp, but most durable.  

Edges 1, 2 and 3 prioritize sharpness over durability.  These kinds of edges will need to be re-sharpened often.

You’ll find these edges on blades used for self-defense, or for skinning or preparing game - where precise slicing cuts are required.  

Edges 4, 5 and 6 prioritize durability over sharpness. They are not as sharp, but do not need frequent re-sharpening. You’ll find these edges on hard-use tools such as chisels, axes, and machetes, where batoning, hacking and chopping cuts are required.

If by “general use” you mean you will use your knife as a bushcraft or outdoor tool, then edges 4 to 6 will serve you well.  If you mean hunting, food preparation or self-defense, then edges 1-3 will be ideal.


Dremel flex shaft adapted to serve as a toolpost grinder. The quick-change tool holder will also serve as a 1/2” boring bar holder (the one that comes with the tool post is for 3/8” boring bars, so I made this one).

Not sure how much actual use it will get. I dread cleaning the lathe thoroughly after every use of it. :/


Facing operations on a 4.25” disk of cast aluminum that will become an adapter for my spare 3” mini lathe chuck for use on a small rotary table or mounted directly to the bed of the milling machine. 

The raw aluminum was sourced (mostly) from old harddrives, cast once into ingots to remove the impurities and for more convenient storage, then sandcast into a rough disk shape for this purpose. 

Some deep porosity was encountered at the top surface of the casting, but it was eliminated upon facing to the final thickness. Minor porosity encountered on the bottom surface of the casting. No major inclusions were found. 

The surface did not finish very well compared to extruded 6061-T6, but that is to be expected considering no flux/degassing compound was applied to the molten aluminum, and the only turning tools available at the time were TiN-coated tungsten carbide instead of HSS.


Monday morning quiz : When was the last time you saw / used one of these?


According to Duke Engineering, their axial engine is the most efficient and lightest engine you can put in boats, light aircrafts, and generators—the mechanical engine of the (near) future! 

[Source] [Via]

(via enginedynamicsinc)