Re: [CAD_CAM_EDM_DRO] Re: um, is the (Chinese scale) dro acting wierd?

thanks for the info. interestingly enough, the first time it happened was
when i changed a bit from the drill chuck.

the other thing i've noticed since the beginning was that there's "noise"
on the display. the digit counters lightly flash as if there was some
frequency disturbance.

i just wanted to make sure that it was NOT the display itself. is this
right?



On Thu, 18 Aug 2005 21:15:22 -0000, klauszietlow <klauszietlow@...>
wrote:

> This is indeed a problem with the Chinese scales.
> They are quite sensitive to noise (poor grounding, long unshielded
> cables...)
> A jump of 0.200" is just one bit flipping in the scale, since they
> count 0x5000 (hex) counts per inch. I have seen this as well on
> several occasions.
> It's quite annoying, but at 0.2" you at least have a chance of
> noticing it.
> There is a good chance that it skips other distances as well that you
> might not notice, but that will still ruin your part.
> Is there any correlation when it jumps to something you are doing,
> like turning on the spindle?
> This stuff is hard to deal with, since you don't know if it's fixed
> for good after you add lets say a cable shield or change the routing...
> Klaus
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, fignoggle <david@f...> wrote:
>>
>>
>> i just noticed this the other day when drilling a series of holes in a
>> plate.
>>
>> all measurements were spec'd, i just had to read off the dro to get my
>> locations.
>>
>> after the second hole going onto the third, i noticed that what i was
>> about to drill did NOT match up with the dro reading. it was off. so i
>> stop and check my math, etc.. this happened all throughout the
> operation.
>>
>> same operation yesterday and noticed it again after zeroing x and y.
>> knowing that something was wierd, i ran the axes to random points to
> check
>> before i started drilling.
>>
>> and then the strangest thing. i saw the dro literally jump by .200" by
>> itself. WTF? it happened all over the place and ONLY in the y axis.
> from
>> 1.000 to 0.800., etc..
>>
>> so, is this my scale? dro? cable?
>>
>> you can see the setup at my site. it's the chinese scales and dro
> like you
>> see at lathemaster.com.
>>
>> thanks!
>>
>> --
>>
>> here's the hf mini mill dro/cnc mod!
>>
> <http://www.fignoggle.com/~fignoggle/hFCn66Ghejx8Jwia3Kl32ReQ/themachine/>
>
>
>
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--

here's the hf mini mill dro/cnc mod!
<http://www.fignoggle.com/~fignoggle/hFCn66Ghejx8Jwia3Kl32ReQ/themachine/>