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Posted by Joseph Gwinn on April 13, 2008, 11:17 pm
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The latest experiment was to use a grooving tool bit that came with the
lathe. The business end is 0.205" wide, tapering to a neck about 0.75"
back, so the sides of the groove being machined are not also
re-machined, and minor inaccuracies of perpendicularity (of tool to
work) are not important. This toolbit was ground out of a 5/8" square
HSS bar.
If not in back gear, it squealed and chattered badly. With the back
gear, grooving was possible, and largely without chatter or squeal.
But as the groove got deeper, and the diameter of the remaining stock
because small, the toolpost tipped more and more. Cutting was
intermittent, even under slow power feed. By hand, the chips were
0.203" wide and about 0.0045" thick. Eventually, the tool bit was
pulled under the workpiece, and the tip of the toolbit broke off.
While all this tipping was going on, I was feeling the lathe. It turns
out that it was the cross-slide (fixed angle, moves perpendicular to the
bed ways) that was loose, so I have been tightening the cross-slide gibs
up.
Joe Gwinn
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Posted by Electricky Dicky on April 14, 2008, 3:42 pm
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On Mon, 14 Apr 2008 12:11:09 -0700, Gunner Asch
>On Sun, 13 Apr 2008 23:17:48 -0400, Joseph Gwinn
>
>>
>>But as the groove got deeper, and the diameter of the remaining stock
>>because small, the toolpost tipped more and more. Cutting was
>>intermittent, even under slow power feed. By hand, the chips were
>>0.203" wide and about 0.0045" thick. Eventually, the tool bit was
>>pulled under the workpiece, and the tip of the toolbit broke off.
>>
>>While all this tipping was going on, I was feeling the lathe. It turns
>>out that it was the cross-slide (fixed angle, moves perpendicular to the
>>bed ways) that was loose, so I have been tightening the cross-slide gibs
>>up.
>>
>>Joe Gwinn
>
>
>In this case, consider replacing a gib screw with a long setscrew,
>tightening up that gib so it wont move, and use the compound feed
>screw to make your cut off.
>
>Next thing to do is crank in the crossfeed past centerline, put the
>cutoff tool on the backside of the part, rightside up, and run in
>reverse and see what happens
>
>Gunner
Cannot do that on my lathe the chuck would fall off <G>
Richard
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Posted by Wes on April 14, 2008, 4:45 pm
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>The latest experiment was to use a grooving tool bit that came with the
>lathe. The business end is 0.205" wide, tapering to a neck about 0.75"
>back, so the sides of the groove being machined are not also
>re-machined, and minor inaccuracies of perpendicularity (of tool to
>work) are not important. This toolbit was ground out of a 5/8" square
>HSS bar.
That is pretty darn wide for your class of machine. (not knocking it since
it is my class of machine also). I'd thin it down a bit.
Wes
http://wess.freeshell.org/clausing/Clausing.html
--
"Additionally as a security officer, I carry a gun to protect
government officials but my life isn't worth protecting at home
in their eyes." Dick Anthony Heller
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Posted by Joseph Gwinn on April 14, 2008, 9:17 pm
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>
> >The latest experiment was to use a grooving tool bit that came with the
> >lathe. The business end is 0.205" wide, tapering to a neck about 0.75"
> >back, so the sides of the groove being machined are not also
> >re-machined, and minor inaccuracies of perpendicularity (of tool to
> >work) are not important. This toolbit was ground out of a 5/8" square
> >HSS bar.
>
> That is pretty darn wide for your class of machine. (not knocking it since
> it is my class of machine also). I'd thin it down a bit.
Well, it came with the lathe. Perhaps it was for the other, larger
machine. But it would have worked had the toolpost et al not tilted and
self-fed into the cut. And I had the same problem with a blade 0.125"
wide.
It's the same as one gets when climb-milling with a mill that has too
much backlash. Self-feeding causing the machine to bite off more than
it can chew.
Joe Gwinn
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Posted by Joseph Gwinn on April 14, 2008, 9:21 pm
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> On Sun, 13 Apr 2008 23:17:48 -0400, Joseph Gwinn
>
> >
> >But as the groove got deeper, and the diameter of the remaining stock
> >because small, the toolpost tipped more and more. Cutting was
> >intermittent, even under slow power feed. By hand, the chips were
> >0.203" wide and about 0.0045" thick. Eventually, the tool bit was
> >pulled under the workpiece, and the tip of the toolbit broke off.
> >
> >While all this tipping was going on, I was feeling the lathe. It turns
> >out that it was the cross-slide (fixed angle, moves perpendicular to the
> >bed ways) that was loose, so I have been tightening the cross-slide gibs
> >up.
> >
> >Joe Gwinn
>
>
> In this case, consider replacing a gib screw with a long setscrew,
> tightening up that gib so it won't move, and use the compound feed
> screw to make your cut off.
The gib screws on the 5914 push the gib lengthwise, versus pressing down
on the gib from the side, so this won't work. I'd be afraid of pushing
the gib in far enough to lock cross-slide in place. It might prove
difficult to unwedge it.
> Next thing to do is crank in the crossfeed past centerline, put the
> cutoff tool on the backside of the part, rightside up, and run in
> reverse and see what happens
As an experiment, perhaps I can clamp the cross-slide to the saddle with
a C-clamp.
Joe Gwinn
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