On 14-05-13 05:55 AM, Viesturs Lācis wrote: > Hello! > > I would like to ask for some advice, hints or ideas for a pretty simple > machine. > The task is to build a machine which would process side edges of wood > boards. > The thing is that board width varies in range of 80 to 300 mm in a random, > unpredictable order. > There are 2 motors - one for each side. > What I have in mind - boards are based along a fixed slide, so one motor is > firmly mounted, the other motor is supposed to be repositioned for the > width of particular board by stepper motor. > > The problem is how to measure the width of board in most simple way. > I was thinking about some ingenious way of using quadrature encoder - > pulse counted by some Arduino, which would be programmed to issue step/dir > for repositioning stepper in some electronic gearing ratio (and home it to > a switch when dedicated button is pressed). > > I created a small sketch of my current idea: > http://picpaste.com/scheme-pemLgnsD.PNG > Basically it is a lever, fixed at one end and the other end attached to > timing belt or whatever, that turns an encoder. Initial gap is smaller than > minimum board width. There would be some small error as the attachment > point of timing belt on the lever end would not move exclusively > perpendicularly to board movement direction, but that might be acceptable. > > The problem with this is that once the board passes through, the spring > will return that lever to starting position very quickly and the motor > might not manage to follow, so I cannot think of a nice way to adjust, how > fast it returns back. > > I will appreciate any feedback! > > Viesturs > ------------------------------------------------------------------------------ > "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE > Instantly run your Selenium tests across 300+ browser/OS combos. > Get unparalleled scalability from the best Selenium testing platform available > Simple to use. Nothing to install. Get started now for free." > http://p.sf.net/sfu/SauceLabs > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Viesturs,
Would you be open to something mechanical rather than electrical? How are you planning to feed these boards (Belt, roller feed, hydraulic)? And what kind of spacing between each piece would there be? Allen ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
