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Making Tools with HSS Blanks

 
 
For under $5 you can obtain a set of HSS blanks from Harbor Freight.  Do this at a store, I have been so amazingly and expensively burned by online shopping with HF that I will never ever do that again.  The stores however are great as long as your are careful what you get.
 


 
One good way to mark a tool in preparation to grinding it is to cover it with tape first.
 
Taped Blank
 
 
I like blades with a bevel on one side only, like a lot of the finer Japanese Tools are made.  They are easier to sharpen to a single bevel, and reference flat to planes.  I cut apart the blades with an angle grinder and a cut off wheel.   Skew chisels, chip carving knives, all sorts of fine tools can be made from High Speed Steel.
 
Range of Blanks Cut
 
 
Bird cage awls, fine chisels, scrapers, simple gouges, and awls can be made easily.  The Awl is made by chucking the blank in an electric drill and spinning it against a grinding wheel.  It can be polished on sandpaper the same way.    This is HSS so the discoloration from over heating does not do harm to the blade.  It may even improve it.  Tempered HSS will hold a great edge, but it is less flexible than a lot of steel.  Push and pound it hard, don’t pry with it. If it does break, it was inexpensive to make so it will be inexpensive to replace.

 
When you are grinding HSS tools, don’t dip them in water to cool them.  This can cause fractures in them.   Instead, take a plant fiber paint brush, wet it and hold the wet brush against the blank as you grind.  When the water in the brush starts to boil then dip the brush in water again.
 
More Tool Ends
 
 
Once a blade is shaped all that is needed is for a notch to be made for it in a handle and for it to be epoxied into place. Epoxy is nice because if you have to replace a blade, you can heat the blade up until the epoxy lets go. This makes it easy to reuse a handle.
 
With Handle
 
 
The notch should hold it tight, but not very.  Too tight a notch can cause the tool to split later.
 
Tool In Handle Slot

 

Once the tool is in a handle, it is easy to clean it up, polish it and hone it to a fine edge.

 

Side view of tool
 
 
Here we are with some very high quality tools for very small change.
 
Finished Tools

 
Bob

4 comments to Making Tools with HSS Blanks

  • stonekutter

    Nice design work. Great thinking on the HF. The only draw back I see would be with making the cut for the handle. You are better off cutting all the way thru the handle , fitting/carving the blade inside and epoxying it together so you can drill a brass rod in the side. then carve your handle…. The blade may flip on you and do damage to ya.

  • Max

    I have been enjoying going through your site, I especially liked your information on lead content, that’s quite an important thing that I have never considered until now. Regarding high speed steel, you may already be aware of this, but one of the main reasons not to quench while grinding is that if it is hot enough when you quench it can actually ruin the temper, from what I understand. When I care to keep the tool cool while grinding (for example when holding the part in my hand rather than in a jig), I water cool it as you mention before it gets very hot at all… but being high speed steel you can grind on it until it’s red hot without hurting it, as long as you don’t burn yourself and as long as you don’t quench it. I don’t have a HF store near me, so I usually order my blanks from Enco – they’re cheap and I’ve had great luck with them. For many of my tools that I make (typically lathe attachments and watchmaking tools) I often use plain carbon tool steels which are great fun to heat treat yourself… but that’s an entirely different topic. 🙂

  • Fitzhugh

    I’m learning a lot from your site. I find making tools more fun than making stuff with the tools, unless it’s other tools 🙂
    Just curious, what are the two tools on the far left in the final picture? I can’t make them out. Is it a quick change socket? What is shape/angle of the handle on the second to left for?

    Thank you!

  • Bob Strawn

    This link will give you more detail, http://toolmakingart.com/2012/04/25/hex-bit-sockets-and-what-is-possible-now/

    The two tools on the left are taper-lock bit sockets. Apart from their being rendered inoperable by magnetic filings, they are absolutely the best bit sockets made. They will lock on any hex tool as solid as you want them. The angled socket is to allow for a blade set into the grip to have a different angle for use.

    Bob

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