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Model Forum / General / Models / May 2006DRO for Lathe - Mixed Scales Possible?
Hi, I'd like to fit a cheap DRO system to my 6" lathe. With the potential error on the cross-slide scale being doubled I am concerned that if I use a typical chinese scale I will end up with less accuracy than I need (or can currently acheive with the dials). Would it be possible to run a cheap scale on the Y axis at the same time as running a better resolution scale on the X axis. I expect that I would use either a budget Asian 2 axis reader or a Shumatec. Any thoughts? Regards Keith > With the potential error on the cross-slide scale being doubled I am > concerned that if I use a typical chinese scale I will end up with less > accuracy than I need (or can currently acheive with the dials). The Chinese scales do have a resolution of 1" / 20480. That is about 1.2µm. The accuraccy is sometimes bad, but mostly a liear error that can be corrected. I don't know exactly how Shumatech handles averaging, but I think that he does a 3 times oversampling. > Would it be possible to run a cheap scale on the Y axis at the same time > as running a better resolution scale on the X axis. Yes, for the Shumatech existst a QE to Chinese-converter. It's called QE100, IIRC. Lester has them. > I expect that I would use either a budget Asian 2 axis reader or a > Shumatec. Any thoughts? The Asian DROs won't handle the QE scales (at least right of the box), because the glass scales need 5V to operate. The Shumatech has provisions for that. BTW: The QE100 converter works with YADRO too. And YADRO does a 10 times (can be adjusted) oversampling and averaging. Nick  SignatureThe modular DRO Available now in USA / Canada <http://www.yadro.de> ..|....|....|....|....|....|....|.. > > Would it be possible to run a cheap scale on the Y axis at the same time > > as running a better resolution scale on the X axis. [quoted text clipped - 12 lines] > The QE100 converter works with YADRO too. And YADRO does a 10 times (can > be adjusted) oversampling and averaging. Nick Thanks for the info and your link looks a very interesting project. I must admit that your answer has shown me that I need to do a lot more reading/understanding before I embark on the project. It will obviously not be as easy as just plugging in and so I will need to consider if my idea is worth while when I may only save about £100 by using one cheaper scale. I'll just need to save a bit longer. Best regards Keith > ... so I will need to consider if my idea is worth while when I may only > save about £100 by using one cheaper scale. I'll just need to save a bit > longer. Yes, it really is worth considering -in the long run- to buy only glass scales. They are more expensive, but their prize is dropping. And they are more relayable, accurate and better protected. I currentyl can't handle glass scales the way I'd like to do it, but I have already designed the schematics. But it will take quite some time to finish that project ... Nick SignatureThe modular DRO Available now in USA / Canada <http://www.yadro.de> ..|....|....|....|....|....|....|.. |
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