On 2/17/2016 9:17 PM, Jon Elson wrote: > On 02/17/2016 03:52 PM, Dave Cole wrote: >> I'm shopping for some linear/glass scales for a custom industrial machine. >> >> I only need to read 8" of travel. >> >> Does anyone know of an economical solution. I'd like full quad >> outputs - ttl would be ideal. >> I don't need super resolution or accuracy. .001" would be sufficient. >> >> > Most since the early 1980's are metric. So, 25 um > quadrature count is .0009843". Therefore, a scale with 100 > um line spacing would give you that resolution. Just look > on eBay. Especially, 8" or so scales should turn up, they > are less useful for machine conversions. > > If you want brand new, there are a bunch of outfits making > DRO systems, and many of them still use glass scales. > Check the Enco catalog, they used to allow you to buy just > the scales. > > There are also things that are essentially digital calipers > with the measuring jaws left off, and they generally do NOT > have quadrature output. Possibly they could tell you by > phone which is which. > > Jon
Are the Chinese glass scales on Ebay ok from what you have heard? There is at least one 8" device for $200 or less listed. I like saving $$ but if the device is unreliable it will cause a lot of issues. Never thought about the Enco catalog, good idea. The digital calipers; I think they have their own serial protocol? I could live with a 250 ms update time on the position so something like that could work if I could extract the position data without too much effort. Thanks, Dave ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
