Tool Grinder Attachment

[matthewsx]

I bought this really cool small tool grinder a little while back.



It was set up for grinding reamers but not much else so I started doing some research. All I could find online was the original patent filing from 1933, it showed another piece that I didn't get which looked perfect for grinding drills and end mills.



So I decided to try and duplicate it based on the drawing. There weren't any dimensions so I had to figure those out, fortunately I had a few pieces of steel that looked about right. I started with the base.



Then I needed to have some kind of tool holder. Fortunately I had an ER32 - MT2 collet holder and a Hardinge MT2 - straight shank taper thing I bought off eBay to work with, I made a knurled piece to serve as a drawbar holder (5/16 cap screw).



I had a piece of scrap left from my other project that was about the right size but since it was from the end of the bar it was pretty buggered up. I squared it up on the lathe and bored and offset hole for my collet arrangement.



I wanted a nice finish inside with a good slip fit so I did the final sizing with a makeshift tool post grinder (HF mini die grinder).



Roughed out a pedestal for the base and started removing material from the collet holder block.



Much layout, cutting, drilling, tapping, grinding, filing, and sanding and I think I have a pretty passable copy of the original from the patent drawing.



Ready to go to work sharpening tools.



Thanks for looking.

John

 

[Latinrascalrg1]

Nice work. But dont stop there......
Extend the shaft that is holding the end mill and allow it to easily slide without slop within the locking collar then add a guide pin to ride in/against the flutes along with a different wheel and you can Sharpen the entire end mill!

 

[brino]

Nice work!

I am currently collecting ideas for extending the use of a Darex E90 from an end mill sharpener to a more fully functional "tool and cutter grinder".

Thanks for sharing this.
-brino

 

[matthewsx]

Nice work. But dont stop there......
Extend the shaft that is holding the end mill and allow it to easily slide without slop within the locking collar then add a guide pin to ride in/against the flutes along with a different wheel and you can Sharpen the entire end mill!

It might not be clear from the pictures but the assembly that holds the er32 collet rotates and slides in/out. I do have a guide pin assembly I got with it so will have to see if that will work or if I need to make something else.

Thanks,

John

 

[cjtoombs]

You could add another axis and a holder for square tools to grind lathe toolbits. There are a number of commercial toolholders for T&C grinders that are made that way for lathe tools, you could probably find one on eBay as well. The kind that you built with a spindle tend to be pricey, and may be too big for your machine. Nice work.

 

[Choiliefan]

What size is your work envelope or travels?

 

[matthewsx]

What size is your work envelope or travels?

Z travel is about 6"
the motor rotates on the Z column and can move in/out about 2"
X moves about 8"
The attachment just rotates and tilts through an arc that's about 3". Should be plenty for any tool I own or am likely to use in my shop.

Next project will be a table for surface grinding probably.

John

 

[Grinder74]

If an air bearing would fit, that would be a great little grinder to have. I will be looking for one myself.

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