MadModder
The Shop => Tools => Topic started by: mzt on September 12, 2012, 03:42:27 AM
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Some days ago, I had to apply a pipe to the handle of the box spanner I’m using on the mill, to remove an overtightened drill chuck:
ended with the business end of the spanner breaking into pieces, luckily the chuck was released at the same moment.
This is definitely not a fix, but I needed something made quickly (and it is still working after a few days. Might end up with
press fitting a collar to this one, someday)
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/01_IMG_1197.jpg)
But I want a more durable one (though the above one reminds me not to overtighten the chuck ANYTIME I’m using it).
Started with this
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/01_IMG_1200.jpg)
And drilled thru a portion of it to the distance between the flats of the square on the drawbar (8mm),
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/01_IMG_1201.jpg)
then some length of it to the distance between the opposite corners (10mm)
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/01_IMG_1203.jpg)
A quick visit to the marking bench
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/01_IMG_1206.jpg)
Then to the mill, to drill the four 1.5mm dia holes (some 12mm deep)
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/01_IMG_1208.jpg)
Took a picture of the other end, too, toghether with the next tool I’ll use, tomorrow.
(I wish I kew where the square file is gone: will do with the triangular one with a little more care).
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/01_IMG_1210.jpg)
Passing close to the vise, on my way to bed… ..it’s almost done now, but no pictures yet.
Marcello
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After some careful filing, that will be a great repair Marcello! :clap: :clap: :thumbup:
David D
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The spanner shaft (a 12mm bolt, should be strong enough for the job) turned to .07mm interference fit,
drilled for the handle, tapped for a set screw.
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/02_IMG_1216.jpg)
Now in the press, barely within the envelope of the machine
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/02_IMG_1219.jpg)
Here it is! I’m definitely satisfied with the fit and finish of the square socket.
May add a taper pin, or have somebody welding the parts together, someday.
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/02_IMG_1220.jpg)
Marcello
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Now I have a working replacement wrench, I can take the risk of fixing the broken one, finally.
First of all, I removed the jubilee clip and paper tape that were holding the loctited part in place,
then put it into the lathe to gain a round end: was not sure about applying intermittent cuts to a glued part,
but it did not move. That material is glass hard, btw.
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/03_IMG_1228_zps9b1a2fc0.jpg)
Next, I turned an alu. collar to press fitting diameter. I suppose steel would have done better, but there
were some alu. tubing odds into the box: too tempting.
Press-fitting the collar.
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/03_IMG_1230_zpse0ff414c.jpg)
The finished job.
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/03_IMG_1236_zpsae7c8300.jpg)
As for the homemade one, I managed to fit an 1/8" taper pin in it.
(http://i1226.photobucket.com/albums/ee403/mzetati/_Tools/Box%20Spanner/03_ITaperPin_zps3643d3e3.jpg)
I measured the diameter of the pin at (A) and (B), then divided the distance from A to B by the number of drills
I had... then it was only a matter of applying enough force to have the pin squeezed down the stepped hole.
Marcello