[JustPlaneSweet]

I ran across a Metronics Technology pastry cutter. Check out the [ame=http://www.youtube.com/watch?v=EOOtx4T7OcA]video here on YouTube.[/ame]

Is there a name for the two timing belt/trapped ring style CNC machine?

Thanks,

Stan

[txcncman]

I used to work for a company that built specialized machines such as this. We never referred to them as CNC machines though. We did use CNC's to build them.

[skmetal7]

I'm sure the math involved with calculating the trajectory paths must be fun!

[JustPlaneSweet]

I'm sure the math involved with calculating the trajectory paths must be fun!

That's where I was going with this thread. How does one describe the kinematics of this system?

Stan

[skmetal7]

It looks like some kind of double Polar Coordinate system.

[svenakela]

First thing that runs through my mind is:
-Why do you build a machine like this?
-Because I can!

It's like a French car. Really complex with no reason.

[txcncman]

Took me a while to think of it, but this is just 2 axis cutting with rotary axis substitution for one of the axis.

[Dman65]

It is early and this is just off the top of my head, but for a moving table design, doesn't this buy you a little smaller foot print for cutting a part of the same size compared to a linear moving table design?

If you have a moving table designed to move in the x and y axes and cut 24" parts, you pretty much need a foot print of 48" in both the x and y direction.

Using this design, to cut 24" parts you need 48" of travel in the x, but the table only needs a circumference of 34".

[eSilviu]

It is early and this is just off the top of my head, but for a moving table design, doesn't this buy you a little smaller foot print for cutting a part of the same size compared to a linear moving table design?

If you have a moving table designed to move in the x and y axes and cut 24" parts, you pretty much need a foot print of 48" in both the x and y direction.

Using this design, to cut 24" parts you need 48" of travel in the x, but the table only needs a circumference of 34".

if you pay attention at 2:53 in the movie, to cut a full length line, the cake is rotated 180 degree in the middle of the line.
So it seems to me that to cut 24" line, the table needs a lot less than 48".

but I agree with the feeling that it was build with the principle "Yes, we can!"

[Dman65]

I admit I didn't watch the entire video. But thinking about it, the spinning 180 degrees would make sense. in that case you only need about a 36"x34" footprint to have a moving table design to cut 24"x24". That is some good outside the box (or rectangle) design work to save what could be some important space. Going from a 16 square feet space to 8.5 square feet is pretty significant and it is done without the cutting device having to move at all so engineering a way to move the water supply line, etc. is not needed.

It makes total sense once someone else has done it lol.

[svenakela]

I admit I didn't watch the entire video. But thinking about it, the spinning 180 degrees would make sense. in that case you only need about a 36"x34" footprint to have a moving table design to cut 24"x24". That is some good outside the box (or rectangle) design work to save what could be some important space. Going from a 16 square feet space to 8.5 square feet is pretty significant and it is done without the cutting device having to move at all so engineering a way to move the water supply line, etc. is not needed.

It makes total sense once someone else has done it lol.

...which could easily be even smaller with a robot arm or a tiny moving gantry (specially the top mounted model).

[vegipete]

This is food industry equipment, which needs to be easily sanitized. That puts interesting constraints on designs...

[jasminder]

The design is very new to me and as a friend already said, it will be fun to write the g codes for it and see how it works (i bet i will create some country maps rather than some squares or rectangular pastries).

However, i don't see any future of this design in wood routers or metal mills.
the debris and the gear/belt aren't going to perform better than ballscrews and lm guides. But i admire the solution they found to get less footprint. For laser cutters, plasmas and water jets, it may be just a beginning of compact machines.

jasminder singh

[skippy]

Yumm! Soggey cake!