ROBERT CHUBB

[myxpykalix]

Robert,
I saw your bowls on the flikr page and I recall you were going to give us some more indepth detail on how you cut them. Did I miss that or are we all overdue for your secrets? lol
(my memory is failing so if you posted something refresh me, i recall vaguely a set of them on a table but not sure). Did you give us all the details?
Also I was intrigued by your joint you designed.
thanks neat stuff

[myxpykalix]

bump?

[wberminio]

Jack
I found a picture of him here:

(http://www.flickr.com/photos/campshopbot/

[myxpykalix]

Thanks..He had posted a picture of his bowls and a drawing of how he held them down. And I was interested in how he registered them then how he ran his toolpaths and then turned them over and ran those toolpaths. I think this is real neat and wanted to find out more. He was going to let us in on how he does it.
I'm curious on what toolpaths he runs first then holds them to run the second toolpath, ect.

[wberminio]

I would be interested also.
I used to turn bowls on the lathe.
Haven't done it in years.Just so some nice apple logs...........

Erminio

[bcondon]

I have been thinking about making some (ROUND)collection plates out of wood for the church as a "challenge" project. The plates would mount wood and be roughed with a straight cutter and finished with a large ball cutter.

Without an indexer, I can see the projects done in a couple of ways and looking for comments.

1. Use the shopbot as it is suppose to be used.

A. hold the wood (mechanical or vacuum) to the table and run a tool path on the top, moving the cutter in X,Y,Z toolpath
B. Hold the prefinished bowl with vacuum in a molded fixture (the mold would be the inside of the bowl)

2. The second method which I have been thinking about is to mount the wood on a turntable that is spinning very slowly and then the toolpath would be a simple profile cut moved slowly so each move can be made and then you wait for the bowl to be spinn through at least one entire revolution and then move again...

The rotating table would have a small motor (1/25HP) like a sewing machine motor.


The challenge with this method is being able to able to vacuum through a moving table. I would assume that you would vacuum at the center of the table and that the fixture would need to be able to rotate (as in a Air Compressor Hose Reel)

comments?

[bill.young]

Hey Bob,

I've got no insights on your moving vacuum table question, but if you want to try your first option above, the Extruder Virtual tool has an option to sweep profiles in circles which might make it easy to try out some shapes. There's a simple example of a dished shape in the Extruder help pdf.

Bill

[myxpykalix]

Bob,
I recall seeing a pretty well thought out and depicted holddown system he had come up with but i didn't understand it fully, thus the start to the thread. But it was all mechanical. I don't think i would trust a vacumn holdown in this application.

Now in regards to your 2nd method you have been thinking about re: a spinning table, here is exactly what you want:

6633
I can see how you could easily attach a inexpensive stepper motor and make it a revolving table with a toolpath similar to how some have used a stepper to make a vinyl cutter.

However in the end I think it would be less expense without having to make a turntable to do it the way Bill suggests.
Although their may be designs that you could create that you couldn't otherwise do....hmmmm..