Re: [CAD_CAM_EDM_DRO] Re: Manual to CNC Lathe Conversion -THREADING

Dave:

>>> This would be based on final part accuacy, no ?
>
> I mean that if there was a slow, the software would try to catch up
> and be either dead on the next pulse, or too short or too far.
>
> Assuming it was dead on, that would mean that at least on thread was off.
>
> It would go back to the old saying, accracy costs money, how accurate
> can you afford to be ?
>
> I think in practice, this is more of a problem in rough cuts and
> finish cuts should not see deviations is alignment.

Yes, this is all based on final part accuracy. Most who use MAch3 use a
simple test, does the nut thread on nicely? If so, it is declared a good
thread. As I said, I suspect Boeing woudl fine the threads deviant in one
way or another, we just found that almost any lathe can cut a thread with
little slowdown on the spindle if any. Lets face it, the spindle of a lathe
is not very stressed with a thread. (If it is, I woudl recommend another
motor or a lighter volume pass. ). Mach3 threads are volumetric, so once you
find a good first pass, the remaining passes take the same amoutn of
material, so the drag is, or should be, the same..


Thanks,
Art
www.artofcnc.ca

----- Original Message -----
From: "turbulatordude" <dave_mucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, August 13, 2005 1:42 PM
Subject: [CAD_CAM_EDM_DRO] Re: Manual to CNC Lathe Conversion -THREADING


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, art <fenerty@a...> wrote:
>> Hi:
>>
>> >>As I understand in, Mach(x) syncs up to the spindle once for each
>> pass, and assumes the spindle speed won't change when the cut
>> begins. If you need precision threads, that may not be good enough.
>>
>> Actually, MachX uses the feedback pnce per Rev, and adjusts the
> speed of
>> the Z if required. It can adjust several times per rotation, but it was
>> found that once per rotation is all thats required.
>>
>> Thanks,
>> Art
>> www.artofcnc.ca
>
>
> This would be based on final part accuacy, no ?
>
> I mean that if there was a slow, the software would try to catch up
> and be either dead on the next pulse, or too short or too far.
>
> Assuming it was dead on, that would mean that at least on thread was off.
>
> It would go back to the old saying, accracy costs money, how accurate
> can you afford to be ?
>
> I think in practice, this is more of a problem in rough cuts and
> finish cuts should not see deviations is alignment.
>
> however, it does add in spindle speed as a function.
>
>
> Dave
>
>
>
>
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