Understanding Lathe/Mill Cutter Comp Startup Moves

[angelw]

In reality, the surface speed relative to a point gets lower and lower and lower then goes up and up and up ... in between going slower and slower then higher and higher there must be a point where it is zero.

For each diameter the surface speed is calculated on, it's the same circumference on either side of Zero, therefore, it's not a case of the speed going down and down, then up and up. For the surface speed to be zero, the diameter must be zero and therefore, it doesn't exist

 

[EmGo]

For the surface speed to be zero, the diameter must be zero and therefore, it doesn't exist

That's what makes it interesting, because we can be pretty sure that the center of a cylinder does in fact exist.

Or maybe it really is the entrance to a hole in the time-space continuum, and if we could only go there, we could travel anywhere in the universe instantaneously

 

[sinha]

The cutting velocity is directly proportional to the radial distance between the tool tip and the axis. Therefore, it is indeed zero at the center. However, by the time the tool reaches this point, the facing is already complete. Nothing left to be machined with zero velocity.

 

[rjwalker1973]

For each diameter the surface speed is calculated on, it's the same circumference on either side of Zero, therefore, it's not a case of the speed going down and down, then up and up. For the surface speed to be zero, the diameter must be zero and therefore, it doesn't exist

Then it must be schrodinger's surface speed

 

[EmGo]

Then it must be schrodinger's surface speed

So that's where the damn cat went !!

 

[rjwalker1973]

So that's where the damn cat went !!

Bill is Schrodinger's cat? But he is so well mannered.

 

[EmGo]

Bill is Schrodinger's cat? But he is so well mannered.

I think he's trying out the 'getting closer' experiment but so far results don't match theory

 

[empower]

What are you going on about? It's absolutely necessary on the lathe. Heck, it's probably more necessary than on the mill. You can't cut a 0.010" chamfer or radius (or any radius really) if the tool has 0.032" TNR. If there's a taper, it will be in the wrong place and size. If there's a precisely sized radius, it won't be round, etc, etc.

And while night shift is here arguing about truncating the dodecahedron, where has @empower been?

christmas vacation, what'd i miss? lol

 

[angelw]

That's what makes it interesting, because we can be pretty sure that the center of a cylinder does in fact exist.

Therefore, on that basis, there can't be Zero peripheral speed.