Bill D
Diamond
- Joined
- Apr 1, 2004
- Location
- Modesto, CA USA
Basic linear scale reader head question
I understand the basics of how a dro reads notches on a glass or magnetic scale and counts the notches going by to measure how far it has moved. I looked and found no information on how it determines which way it is moving. AFAIK the notches are symmetrical so no help that way. Does it read in like three spots at a time and they are spaced at a logarithmic distance apart so it sees one before the other in each direction. Some what like a viener scale.
The cheap dro scales sold on ebay are they mostly magnetic these days or glass?
Bill D.
I understand the basics of how a dro reads notches on a glass or magnetic scale and counts the notches going by to measure how far it has moved. I looked and found no information on how it determines which way it is moving. AFAIK the notches are symmetrical so no help that way. Does it read in like three spots at a time and they are spaced at a logarithmic distance apart so it sees one before the other in each direction. Some what like a viener scale.
The cheap dro scales sold on ebay are they mostly magnetic these days or glass?
Bill D.
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