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DRO switch

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Redpiperbob	22/01/2011 06:55:16
92 forum posts 41 photos	Hi All I have a mill with a 3 axis dro setup on it and a lathe with 3 axis dro each uses Allandale scales. I have only one display unit what I would like is an electronic switch that would allow me to switch between the two different inputs. can anybody help with a curciut. Sorry if this is the wrong place to put this but I could not find a beeter heading. Thanks in advance Bob
Les Jones 1	22/01/2011 10:34:13
2292 forum posts 159 photos	Hi Bob, I am making the assumption that these are the quadrature scales with TTL outputs. Here is one way to switch the scales over. (NOTE this will NOT work with the Chinese scale that use 2 x 24 bit protocol.) Be aware that you can not switch back and forward between machines without resetting the zero reference. This is because quadrature scales do not give out absolute position information. They only tell the DRO that they have moved one unit of resolution up or down. There are many alternative ways to solve this problem for example one of the switches used to switch a parallel port printer between computers. Les.
Redpiperbob	22/01/2011 11:57:03
92 forum posts 41 photos	Hi Les Yes they are Sino scales and you sir are a star that is exactly what I was looking for. Now to Eagle to make a board Thank you very much Bob
Les Jones 1	22/01/2011 12:46:17
2292 forum posts 159 photos	Hi Bob, I drew this diagram with eagle so if you want the file send a message using this forums message system with your email address. I think that method is safer than putting your email address in these pages. If I was building a one off of a simple circuit like this I would use stripboard. If the DRO is capable of providing enough current you could leave the + 5V connected to both sets of scales rather than switching it. Les.
Redpiperbob	22/01/2011 14:01:22
92 forum posts 41 photos	Hi Les The offer of the file is very good of you but as you say there is very little in the curcuit so I think I will use stripboard. Thanks Bob
Billy Mills	22/01/2011 14:22:20
377 forum posts	Another way would be to use a multiway connector on the display and matching connectors on the machines so you could have the display in just the right spot for each machine. If everything is grounded down there is no static risk in swaping the display over but keep the ground on the display. Regards Alan.
Redpiperbob	23/01/2011 07:06:56
92 forum posts 41 photos	Thanks for that sugestion Alan but the board is made and the box for it is almost done Bob
Redpiperbob	08/02/2011 06:41:50
92 forum posts 41 photos	Hi Les just thought you would like to know the switch is up and running. on the mill and the lathe . It works a treat. Thanks once again Bob
Les Jones 1	08/02/2011 09:46:31
2292 forum posts 159 photos	Hi Bob, Thanks for letting me know it works. When designing something no matter how simple it is always possible to overlook something. There is always this slight doubt when you have not built and tested the circuit yourself. Les.

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