Fun At Home Shop Projects ........commenly Known As " G " Or Government Jobs

mmcmdl

mmcmdl

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Cheap mans boring head . Not a Criterion nor Walhopter but will get you thru non-critical jobs .

Bore or drill a piece of stock in one end true to OD . Turn part around and turn an OD that is offset for your shank . Make another piece that fits your bore with an offset boring bar hole . You have created an eccentric in essence . You can adjust your toolholding piece as well as rotating your bar to achieve your desired size . DO NOT MAKE PLANS FOR G JOBS . ( that way you never make a bad part , it's re-engineering ! )

If accuracy is a must , it is possible to drill a hole to a known dimension and set this head to such hole .

Good luck and happy machining . Dave

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Very handy thread tool fixture . Has angles for 60 degree + Acme threads . For use on a surface grinder . I made this a solid holder but if you think you may have trouble with the square , either split the part and bolt together or just use a hole and reposition your set screw location .

Mill the crap out of it using whatever means you may have . Accuracy is up to you , sinebar or such . These are compound angles which give you your needed clearances on your finished tools . You may find it difficult calculating these angles , but it's half the fun . There will not be a square angle when you're done !!!

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Poor mans scissors type knurling tool . This one is self explanatory and is simple . Make no dimensions . You know why !!! Haha

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Disclaimer ...........please take no offense regarding my " poor mans " usage in these posts ...........


" I was born broke and have only a fraction of that left at this point " Oh well , all is good .
 
mmcmdl said:
Cheap mans boring head . Not a Criterion nor Walhopter but will get you thru non-critical jobs .

Bore or drill a piece of stock in one end true to OD . Turn part around and turn an OD that is offset for your shank . Make another piece that fits your bore with an offset boring bar hole . You have created an eccentric in essence . You can adjust your toolholding piece as well as rotating your bar to achieve your desired size .
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Click to expand...

Hi. This looks really interesting. I do not quite understand how that screw holds everything tight while boring. Does it bind against the piece with the shank? It doesn't seem to be threaded into the shank piece.
 
You got it Eric . That pin has a cam on it locking it onto the shankpiece . The bar set screw is tapped on the inner piece . Of course , when they rust together such as mine has , they are only good for boring one size . ! LOL . ( I threw the cam pin out of it while dismantling it in the garage ) I'll probably never see it again .
 
If it is like my stuff I only find it when I don't need it, then put it away so that I can find it when I do need it, but then forgot where I put it. Darn I guess I will just have to go get another one, or make something.
 
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