Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: DennisCNC on August 22, 2008, 09:42:26 PM

Title: Offset tangential control?
Post by: DennisCNC on August 22, 2008, 09:42:26 PM

I know its simple in Mach to do tangential control if the tool is directly under the rotating axis, what about something like this:
http://www.youtube.com/watch?v=vwrjVVu_Jms&feature=related

Or is it done in cam?

Thanks

Title: Re: Offset tangential control?
Post by: Overloaded on August 22, 2008, 11:19:44 PM

Hey Dennis,
That is pretty neat. Thought about doing something similar not too long ago.
Just subtract the distance from the inside edge of the saw to the radius point of the rotary axis, from the the actual radius of the finished part. Or offset that same distance to the inside in lazycam.
Never went any further with it though.
Thanks for the link, cool.
RC

Title: Re: Offset tangential control?
Post by: jimpinder on August 23, 2008, 04:14:50 AM

Looking at it, it appears to be a circular saw held on two axis. I assume the saw position can be moved into or out from the central pivot, and the central pivot is a rotary axis.

Cutting outside the shape, as shown, the centre of rotation will be from the inside edge of the saw, to the central pivot, the width of the blade as it swings just cuts outside the line.

It would be difficult to calculate if you were cutting an inside edge though.

Title: Re: Offset tangential control?
Post by: RICH on August 23, 2008, 06:07:36 AM

Well thats certainly different and interesting. Looks like an optional way of cutting granite instead of the conventional large profile machine. I wounder how they plan on edging it? I would be bet it's done in a cam program specific to the machine.
RICH