Re: [CAD_CAM_EDM_DRO] Threaded Rod/Cable Driven Encoders

Just a quick note:

My CNC instructor pal mentioned that while the plastic nuts are good, you have
to be really anal retentive about keeping them clean. If a little swarf or
other abrasive material gets to them, they have a bad habit of commiting hara
kiri shortly thereafter.....

Bill

On Tue Jan 29 16:41:36 2002, vrsculptor, <vrsculptor@...> wrote:

>Gents,
>If I followed the thread correctly on threaded rod backlash isn't a
>problem if you use a plastic nut. The problem seems to be cumulative
>cyclic error. It seems to me that you could get around this problem
>pretty easily with a http://www.usdigital.com/products/ S2 or H3 2K
>pulse/revolution encoder driven by a cable streched along the axis
>and wrapped around a capstan attached to the encoders shaft. I recall
>seeing something about this last year where someone was using this on
>a lathe but can't find it now.
>
>Do any of you have any long term experience with cable driven
>encoders? Are they working out and staying accuarate?
>
>I'm still dreaming about builing a realy big router...
>
> Roger
>
>PS. My 3d laser stripe digitizer is coming along pretty well. Its now
>controlling the mill for automated scanning. I hope to post software
>and a tutorial in the next couple of months.

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