Re: [CAD_CAM_EDM_DRO] Just How Accurate Is CNC?

Some physicist have just managed to condense light into a crystalline fluid
like state, slowing it down to around a few miles an hour.

I kind of like the idea of being able to run along infront of a beam of
light.

Now we just need some way to implement a multimillion pound system into a
desktop mill, for around $100. Then we're cooking on gas! :^)

John

> Hi Chuck,
>
> I am afraid you have got your units slightly mixed up. At 20MHz the pic
> is executing each instruction in 50ns. We need a resolution of 0.000150
> ns.
>
> Light is just too damn fast :-)
>
> Les
>
>
> Chuck Rice wrote:
>
>>
>> So 150 fs = 0.000150 ns
>>
>> A crystal 20 MHz PIC can run at 5,000,000 instructions per second.
>> Doesn't that give a headway of 75 instructions per required resolution?
>> Perhaps my math is off, but if not, with a PIC chip, you can do a
>> lot in 75 instructions. If you wanted to drop it a notch tighter,
>> 15 fs would give you 7.5 instructions per second. That might be
>> pushing it.
>>
>> I doubt that I have enough knowledge to do it, but I think that
>> someone will be doing it soon. Too many of the pieces are becoming
>> available at low price points.
>>
>> Seems, even if you wanted to laser engrave a scale on the bottom of a
>> table, you could read it much the way we read a micrometer. You
>> could have a set of LEDs that read the course scale and another set
>> matched the fine scale. The two readings together would give you
>> a pretty fine resolution.
>>
>
>
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