Re: [CAD_CAM_EDM_DRO]A question of size managenent.

Hi Again Marcus

Well,,,, I suspect that every owner of these Cad programs is faced with this size problem and if their CNC will not handle an arc
command they are simple forced to live with it. However my controller is conversational and does utilize the arc command and
would benefit from having a short conversion program that would convert line segments of arcs into arc commands. I don't imagine I
am alone with this problem. I would expect that thousands of guys are living with it as we speak.

Bill Darby


Marcus & Eva wrote:

> Hi Bill:
> I goobered my post of this morning a bit: where it said "Splines and
> arcs will output as line segments in most CAM software", it should have said
> "Splines and SURFACES..."
>
> If you created a swept surface and then generated toolpaths to follow the
> surface, you will have gotten code that was a whole bunch of short linear
> moves (G01 code).
> Depending on the sophistication of AUS CAD as a CAM program, you have
> several options to get code that includes arc moves.
> Mastercam, which is my main CAM program, allows spline to arc conversion,
> and also allows me to generate profiles from arcs with tapers in "Z".
> I have no idea if AUS CAD can do anything like that.
> If you can place points on your surfaces then you could construct arcs at
> each Z level that you want to cut, and create some kind of contour path
> along each arc.
> Or you can try to write a subroutine that offsets your base geometry by a
> set amount at each change in Z.
> This was what I was talking about earlier...
>
> " A lot of the guys I worked with, preferred to take a simple 2D profile and
> >> program only the first pass.
> >> They would then "loop" the program to create all the subsequent passes.
> >> That gave them only one short chunk of code to edit.
> >> If you have multiple copies of your profile to cut, it makes for a very
> >> economical program, but you have to know how to set up the loop commands
> in
> >> your particular controller."
>
> If they were making a parallel sided part, they would repeat the subroutine
> enough times to get to final depth.
>
> If they were making a tapered part, they would offset the geometry by a set
> amount for each change in Z.
>
> In each case they were making a single part: multiple passes from only a
> single profile.
>
> Marcus
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager