Lathe "work truing" tool

[olderdan]

Thanks for the pic Ed, that one is a real hoot cant help laughing every time I look at it.
Bichones are noisy little buggers but always entertaining.

[Ralphxyz]

Thanks Ed, now it is "starting" to sink in.

The item in the chuck has to have a flush finished face at 90° to the spindle, most of my work pieces do not have a flush face so I am still having trouble
understanding.

Like you said I can see the workpiece is repositioned and no longer wobbles, and then olderdan's comment "Maybe useful also to mention re tightening the jaws after use." makes sense. The work piece would not be firmly chucked, I rely on firmly tightening the chuck to "true" the workpiece if the chuck is tight then the tool would not be able to reposition the workpiece so I think I am still missing something.

Thanks for the help.
Ralph

[Frank S]

Tools such as these are handy for truing the work in both the cylindrical as well as the face plane this would be why the OP has a bearing on both ends 1 bearing would be used for truing the face as in the video while the other end when the tool is mounted in the tool post parallel to a cylinder would be used to lightly preposition the work in the chuck. You would never need to engage both bearings to the work at the same time
Using a tool like this would be a time expedient way a truing the work without the need to set up a dial indicator
As always re-tightening the chuck afterwards is a common practice using either method a truing tool or an indicator

[KA4993]

Glad you like it... I too have to chuckle every time I see it and if enlarged enough you can see that the mouth is open.... also that the pooch is wearing what appears to be a red Fireman's Helmet.

[Wmrra13]

Thanks, I've got an upcoming project that begging for one of these!

[Aussie48]

A very handy addition to the lathe tools thanks for posting, simple effective like all good inventions.

Dick

[philipUsesWood&Brass]

Yup, I watched it but did not see anything but the bearing rotating, what am I supposed to be seeing.

What does the tool do?

A few words and then the video might make sense.

Sorry but I am brand new to using a lathe.

I do not see where this would "true a lathe" it might indicate a lathe not being "true" or being true.

I do not understand a "trueing tool".

I can see how it might be used to indicate a tool post, if the tool post/tool holder was not perpendicular to the face of the
test piece that would be obvious, but that is an indicator not a trueing tool.

Ralph

When one installs work into a 4 Independent jaw chuck it typically is not "True to the Axis" of the Lathe.

The Jaws are only slightly touching the work. At the point the bearing Starts to touch the work, it will only touch @ one spot, gently tightening THAT jaw will move the piece in the opposite direction, NOW two sides will touch the bearing!

Countinuing that process UNTIL All sides of the work rotate the bearing. At that point it is "True to theLathe". Tighten all Jaws. THEN RECHECK!

That Recheck is like the carpenter's "Measure Twice Cut Once". Potential of moving a Jaw too Much is ~Frequent~ for Beginners, I know as I have been a Beginner for 25 years.

philip

[Ralphxyz]

"gently tightening THAT jaw"

We are talking about a 3 jaw chuck aren't we?

I see and understand and appreciate the function now, added to my to do list!!

Ralph

[philipUsesWood&Brass]

"gently tightening THAT jaw"

We are talking about a 3 jaw chuck aren't we?

I see and understand and appreciate the function now, added to my to do list!!

Ralph

Ralph, I rewrote that to clarify. I Am MUCH Too Tired these days from tearin down my shop equipment & house to MOVE to another location.

Sorry for the confusion, it was all on me.

philip

[Ralphxyz]

Well hey philip want to come over to my house and repair the termite and water rot on the entire perimeter of my 30' x 30' pool house?

I need to redo the sill plus 2' up around the entire building.

Ralph