Re: [CAD_CAM_EDM_DRO] Re: Measuring accuracy

Doug, that's what I thought, but which software under 1000 USD actually
does this? I've tried several and running a G02 is much more accurate
for cutting a circle than any of the CAM software I tried.

Greg



doug98105 wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Gregory Kamysz
> <smsupply@a...> wrote:
>
>>I just found out that the accuracy of my setup won't be defined my
>
> the
>
>>mill but by the software I'm using. I've looked at all of the sub-
>
> 1k$
>
>>software and they all seem to work the same. There is always some
>>rounding in the numbers. Much more tolerance than accuracy in the
>
> mill
>
>>would cause. If I write the G-code, it's not a concern but if I
>
> use a
>
>>software to generate G-code I'll be lucky to get +/-.05mm before I
>
> even
>
>>start the spindle.
>>
>>The error I'm talking about is when using a .25mm step over and my
>
> part
>
>>edge falls somewhere in between a step. Sure, I can cut parts
>
> at .01mm
>
>>stepover but who is going to wait weeks for a part to run on the
>
> mill?
>
>>If I want something pretty to look at, it's not a concern, but if
>
> I want
>
>>to use the part in an assembly, it's unreasonable.
>>
>>Am I missing something?
>>
>>Greg
>>
>
>
> Huh??????? Yeah, you're missing something.
>
> CAM software does not limit the accuracy of your parts. The
> software will make a partial step over on the last pass, but never
> going past the part profile. Actually, it depends on the software.
> For instance, if you're removing material up to the part profile and
> it's done in two step overs. Lets say 1/4" has to be removed and
> you specify a step over of 3/16". The software could do it several
> ways, take a 3/16" step plus a 1/16" step. Or it could take two
> 1/8" steps. Which ever way I've never seen software that would go
> past the part profile because of specified step over amount.
>
> Getting back to accuracy testing....there are all sorts of ways. I
> prefer cutting rather than testing with indicators with no load on
> the machine. The load on the machine is what will determine play or
> lack of rigidity in the machine.
>
>
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
> Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
>
>

--
Gregory Kamysz
Crystal Lake, IL
USA

Electric Ducted Fans
www.edfinfo.com