Re: [CAD_CAM_EDM_DRO] Re: Need some help!

Because there are two rollers, one on each side of the cam. If the cam
path is 90deg from the axis, the path is full width. If the path is at
a 45deg angle, the path is narrower. Hold two pens or pencils together
and draw a wave, you'll see the distance between the lines narrows. It
also isn't a simple matter of offsetting one line vertically from the
other, since you have to account for the diameter of the rollers.

Regards,
JJ

On Saturday, Nov 1, 2003, at 03:21 US/Eastern, stevenson_engineers
wrote:

>> --- In CAD_CAM_EDM_DRO@yahoogroups.com, John Johnson <johnatl@m...>
>> wrote:
>> Ed,
>>
>> I understand what you're talking about. Give me a little time to
>> work
>> on the math.
>> Basically, the approach to take is by creating the curve in the
>> flat,
>> that is, substitute X for the A axis. When machining, you can sub A
>> for
>> X. I'm working out roller and tool offsets and the like. What
>> you'll
>> need to do is find the angle perpendicular to the curve at some
>> point,
>> measure out along that angle for the radius of the roller, that
>> will be
>> the path the roller should be on. From the same point on the same
>> angle, move out the radius of the cutting tool, that will be that
>> actual cut path.
>>
>> If you have the curve designed, email it to me and I'll work with
>> it in
>> TurboCAD. I've been working on radius compensation using VBA in
>> TurboCAD, so this is along similar lines.
>>
>> More later.
>>
>> Regards,
>> JJ
>>
>
> Am I missing something here?
> If you have the path why not just program that path ????
>
> John S.
>
>
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