Mcnaughton center saver with Bosch visualizer

[justaccord]

Anyone used these two together? I'd like to get some details on what equipment, fittings, etc are necessary.

Thanks.

Dave

 

[hockenbery]

Interesting concept.
I use the Bosch visualizer for hollowing.

I have used the mcnaughton too but not with the visualizer.
In hollowing the visualizer is fantastic as you can see where the cut is being made and use that to decide where to cut next at each step of the hollowing.

I can't change where the mcnaughton cuts after I set the guide gate.
I'm not sure the visualizer will be much help with the mcnaughton because you really can't change where you cut once you set up guide post. It will show you the track of your cut relative to outside of the bowl but you can't correct the cut on the fly. You would have to reposition guide post and start the cut again.

If I were to use the visualizer with the mcnaughton
I would cut a piece of cardboard 2" wide in the shape and length of the each mcnaughton blade and mark lines on it every 1/4". Then to core a wall thickness i can hold the cardboard against the blade and trace the that wall thickness on the screen overlay.
I then have a thickness line along the blade that should be close to the outside of the bowl as I core. Of course, Bowls are rarely the exact profile of a blade so some deviation is expected but I can see what is happening. Could be a great for a coring demo.

When I set the mcnaughton gate I hold the selected blade over the bowl to see where it will cut. So I know where the wall will be thicker or thinner than the entry cut width.
This is what I would see in the visualizer. If I have already seen it with the blade above the bowl i don't need to see it on the visualizer screen.
I suppose the visualizer would show me how close I am to cutting the core free.

 

[Bill Boehme]

I would cut a piece of cardboard the shape of the mcnaughton blade 2" thick and mark lines in it every 1/4". Then when you get ready to core a wall thickness you can hold the cardboard against the blade and trace the appropriate wall thickness on the screen overlay.

I can visualize, if you'll excuse the pun, that it might be a good way to graphically determine the entrance angle for the blade. Sketch the blade position on the overlay and then project the trajectory of the blade ahead of the cutter tip by an amount that equals the curved section of the blade. The two initial conditions that you know are the desired diameter of the core and the depth at the center. With the tip of the blade touching the blank at the desired radius, adjust the entrance angle until the projected trajectory crosses the centerline at the right depth. Maybe this is what you are suggesting in making the cardboard template that matches the blade radius, Al. This could potentially reduce the need to back out and widen the entrance of the kerf.

 

[john lucas]

I theory the blades are part of a circle. My homemade are definitely part of a circle. so I'm trying to visualize (and having trouble this morning) how it might work if you drew a circle on the screen to match the blade size. Then as you move the blade around before inserting it that would move the circle and you could position it on the bowl blank to give you the cut you want and the cutter would then still be on the outside. At that point just lock the gate in position. I haven't used my McNaughton in several years now and still don't have all the parts I need for my Visualizer so I'm kind of guessing here.

 

[justaccord]

Well, my thought was that you would use the visualizer just the same as with hollowing. You could set a wall depth and keep the tool at a constant distance from the bowl exterior. The difference is that the mcnaughton tool has a somewhat set trajectory, unlike a hollowing tool. But you can change the trajectory by changing the kerf. Knowing ahead of time that you were going to go through the wall would have to be helpful information, wouldn't it?

 

[Bill Boehme]

I theory the blades are part of a circle. My homemade are definitely part of a circle. so I'm trying to visualize (and having trouble this morning) how it might work if you drew a circle on the screen to match the blade size. Then as you move the blade around before inserting it that would move the circle and you could position it on the bowl blank to give you the cut you want and the cutter would then still be on the outside. At that point just lock the gate in position. I haven't used my McNaughton in several years now and still don't have all the parts I need for my Visualizer so I'm kind of guessing here.

The McNaughton blades are circular curves although one of my blades has a bit of a kink in its get-along.so I might need to bend it to fine tune the curve.

The circular arc that you draw on the screen remains stationary while the front of the blank pivots about the point where the tip of the cutter is touching it.

 

[Emiliano Achaval]

I use the McNaughton a lot. The only thing in my opinion that will help is a laser like with the Lyle Jamieson system, to see where the point is at..

 

[hockenbery]

Well, my thought was that you would use the visualizer just the same as with hollowing. You could set a wall depth and keep the tool at a constant distance from the bowl exterior. The difference is that the mcnaughton tool has a somewhat set trajectory, unlike a hollowing tool. But you can change the trajectory by changing the kerf. Knowing ahead of time that you were going to go through the wall would have to be helpful information, wouldn't it?

You can see where the cutter is inside the bowl if you draw its outline on the screen overlay.
You can't correct the cut as you are making it.
You have to pull the tool out and start another cut.

You could like Bill suggested, draw the trajectory of the cutter on the overlay ahead of the cutter.
This would show the cut you are about to make. You can adjust before making the wrong cut.