Originally Posted by RICHARD ZASTROW  Gkohl, From the info given to you, it seems like somebody is using the specs from an advertising brochure. If that's true, find out what the vendor is selling.
One spec. you use is .0005" (resolution /degree) with repeatability +/- 2 seconds. Thats 2 different types of measurement. .0005" @ what dia.? Resolution more or less indicates what the readout will display, not the accuracy of the device. Repeatability tells you that the device will return to the same location within that tolerance. Unfortunately that could mean it will return precisely to the same wrong place.
What you will need to find are the system accuracy requirements in arc second (angular) and repeatability in arc seconds (angular) OR dimensional accuracy at a given diameter (.0005" at a 6.0000" diameter with a repeatability of +/- .0002" at a 6.0000" diameter).
Does the device locate at any or all positions (ex. 243 deg 3 min. 27 sec.)? Or known incremental positions (4 divisions, 90 deg.; 6 divisions, 60 deg. etc.), typical of indexers using M code induced movements.
It's really not all that complicated if the terms are understood. Hang in there, it'll soon be clear as mud. lol
Dick Z |
Yep, that's exactly what happened.
I found out the foreman was approached by a dealer peddling the following line. He went to my boss, and then they asked me if I could find an established high end brand that has the same or better stats.
http://www.yuasa-intl.com/products_indv.aspx?pid=1
They want the equivalent to the 220 and 400 versions of this table