Re: [CAD_CAM_EDM_DRO] Liners Encoders and such....

There are all sorts of expensive measuring equipment that use ball-bears as a basis for the coarse steps. The ball are manufactured to very close limits. These machines are not seen very often these days because the electronic twiddly things have taken over.

----- Original Message -----
From: D.F.S.
To: CAD_CAM_EDM_DRO@onelist.com
Sent: Thursday, March 16, 2000 4:01 PM
Subject: Re: [CAD_CAM_EDM_DRO] Liners Encoders and such....


From: "D.F.S." <dfs@...>

All the talk of linear encoders has wandered all over the map.

Several years ago there was a thread like this in the metalworking
newsgroup.

At the time some people were talking about "Induction" (If I recall)
sensors based on very close precision bearing balls.

They were simply packed tightly in a non-magnetic tube of a slightly
larger diameter.

This seems like the best option from several standpoints including
toughness. Obviously it is more compled to read, but once you make
the step to a uController, it should simplify the task greatly.

Marc




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