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mc #604251 10/07/21 10:52 AM
Joined: Dec 2001
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Originally Posted by mc
I have brownells thin bit set and they need to be annealed .i learned to file up my screw drivers from Len bull and Jack Rowe you can use a grind wheel in a drill press at slow speed to shape the tip of your tool.

I use a 1” diamond wheel in my drill press to reshape screwdrivers. Perfect radius for holllow grinding and for some reason doesn’t heat up the metal as a stone will. And I use a small machinist vice purchased on eBay to clamp the screwdriver in. Grind one side and flip the vice over and grind the other side. The result is a driver with perfectly parallel sides.


Everybody Is ignorant, only on different subjects. —Will Rogers
1 member likes this: mc
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Originally Posted by Joe Wood
Originally Posted by mc
I have brownells thin bit set and they need to be annealed .i learned to file up my screw drivers from Len bull and Jack Rowe you can use a grind wheel in a drill press at slow speed to shape the tip of your tool.

I use a 1” diamond wheel in my drill press to reshape screwdrivers. Perfect radius for holllow grinding and for some reason doesn’t heat up the metal as a stone will. And I use a small machinist vice purchased on eBay to clamp the screwdriver in. Grind one side and flip the vice over and grind the other side. The result is a driver with perfectly parallel sides.

Joe;

You are very correct 1 inch is an excellent size diameter to shape screwdrivers and the point you make about the diamond one is spot on.

As to the equipment to grind the shape of the hollow grind tip, the mini mill/drill is top notch and worth the money if you only were to use it for that task alone as you can mount your screwdriver in a milling vice and not have to move it to grind parallel sides. I have had mine for so many decades that they only cost $200.00 then if that much. There are dozens of things you can do on these little wonder drill/mills in repairing guns. Many people think the asian made mini mills and lathes are a piece of junk, but they are excellent for small tasks where you only need thousands of an inch accuracy vs. ten thousands of a inch accuracy. Of course a skilled machinist can take a worn out South Bend lathe that is 80 years old and produce very accurate work. I am using my mini drill/mill today as I make a barrel wall thickness gauge. https://www.grizzly.com/products/gr...02em48wIVja_ICh0A_AmrEAAYASAAEgJai_D_BwE

Nitrah #604289 10/08/21 06:00 AM
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Screwdrivers for those very narrow slots in the end after some use I found that they would eventually twist or break. so a long time ago I started to make my own but found that re purposing screwdrivers I in second hand shops and later car boot sales. The main problem a lot of folks find with re grinding screwdrivers for thin slots it was rather difficult not to draw the metals temper ending up with a soft blade. There is a grinder that is more akin to wood working though I now would not be without one though I am not suggesting that you rush out and purchase one but if you are a practical type of person you would wonder why you never purchased one a lot earlier. I am talking of a standard four inch fast grind er with a fast dry stone located at one end and a wet grind stone at the other, Ideal for sharpening hand plane blades and wood chisels to knives and scissors and everything in between. The water stone stops drawing the temper from the steel no matter how thin you grind it to so ideal for hollow grinding screwdrivers. I found that after rough grinding lathe tools from HSS blanks a quick touch up of the cutting edge on the wet stone I could skip the oil stone honing of the cutting edge, the one in the picture is a standard hobby type not a lot of money I have had one for a lot of years now replacing each stone twice for the wet and four times the fast stone.

[Linked Image from i.imgur.com]


The picture is a stock one but they all look the same also the cost of the grinder can vary dramatically depending what name is on the thing.


The only lessons in my life I truly did learn from where the ones I paid for!
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