Repairing a jacked cat-40 toolholder

Awl --
An unremovable setscrew left me doing the unthinkable:
I ground the goddamm thing out with an 4.5" angle grinder, so there is
like a gash half-way into the nose of the 3/16" toolholder. If you held the
toolholder in the vertical, the ground-out region would be in the
horizontal.
From previous responses, the whole holder is hardened, so drilling/tapping
another hole will be semi-futile. If I *could* do this, this would work,
even with this gash, as the tool would still be substantially supported.
So I figgered I'd mebbe weld this gash up with some soft rod, or even braze
it, then drill/tap it.
I thought I'd stick some old 3/16 carbide in the holder, to keep anything
from "spilling" too far inward, and pray that nothing sticks to the carbide,
or that nothing warps so bad I can't get the carbide out.
This toolholder doesn't have to be superstrong or super accurate, as it will
doing lite stuff -- after all, these are only 3/16 tools, some engraving,
etc.
Any tips, caveats in pursuing this? Best fill rod? Brazing better?
Combo??
Heh, the good news is: At this point, I got nuthin to lose!!!
Reply to
Existential Angst
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Your time is obviously quite valuable..
Maybe you can use it for a doorstop.
Reply to
PrecisionmachinisT
EA,
Have you gotten advanced B.Coli again??
Take a look here for a brand new one...
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It cannot be worth the time to Futz with, except for a hobby, recreation.
Just get a new tool holder, and go back to making Product! Nobody will pay you to fix that tool holder, only for shipping product.
Now back to work!
Reply to
Cross-Slide
I forgot to add. For a small tool like a 3/16" you want a nice tool holder. Runout is always more and more critical the smaller the tool.
So, it ~might~ be worthwhile for a larger toolholder. a bigger tool can tolerate more runout without being hurt. For the small tools, only use good toolholders.
Reply to
Cross-Slide
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If you had used an old carbide endmill running fast you probably could have drilled it out. You would need a green wheel or a diamond wheel to sharpen the enmill to a point like a die drill.
John
Reply to
John
I'm not even a machinist, and even I know that you've rendered your toolholder useless. Like you said, you've got nothing to lose, but at this point I think you've got very little to gain by trying to save it, especially by weld bead.
To restore it to functionality would be more expensive than just a replacement toolholder; retire it. Maybe put it on your bookshelf and label it, "Don't Do This."
Good Luck! Rich
Reply to
Rich Grise
Like others have said, this one is ruined. But they can be machined. The first 50 thou is hard as glass and will dull damn near anything. After that regular carbide tooling works fine.
I've bored the top 3/4" out of several CAT40 holders so I could add an insert converting the holder to NMTB40. To do this, I took a stone in a die grinder to get rid of the top layer, then a quick boring job in the lathe.
Reply to
Karl Townsend
This sounds like you have already close to cut the holder in half?
You could press fit on a sleeve and put a longer set screw in the sleeve.
-jim
Reply to
jim
That is a very *elegant* -- even slick -- solution!! My only hesitation with that would be the increase in diameter of the small nose, which comes in handy in some ops.
Also, I think this should weld up perty easy, if the material is not too exotic, and then it would be the same drill/tap fix. My only concern would be warping and/or sticking of the weld material to any carbide I stick in there as a kind of shield.
To Cross Slide: Heh, if I get this fixed, this will be my most productive effort in about 3 months!!! Goodgawd..... Ahm like *inches* away from fame, fortune, riches, and bevies of wimmins with nice big asses..... but those few inches are filled with 4140 plate.... and hardened 4140, at that....
Too bad you cain't perfume up bein broke..... well, I guess you can, if you consider beer a kind of parfum, and a saloon a salon......
Reply to
Existential Angst
Snip usual drivel
ROFLMFAO
HTH, PaulS
Reply to
PaulS

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