On 5/13/2014 2:14 PM, Viesturs Lācis wrote: > 2014-05-13 21:40 GMT+03:00 Ralph Stirling <[email protected]>: > >> It seems to me what you really want is a jointer. You >> are just planing down the edge of a board of variable >> width, correct? That is what a jointer is for. >> > > Pretty much yes, except that board widths will randomly change from 80 to > 300 mm and AFAIK none of the existing solutions can handle that. All of > them have to be set up for particular width, but they cannot adapt "on fly" > and it is very difficult to rebuild them so that they could do so, that is > why I think that building such a thing from scratch is easier. But since I > feel stronger in mechanics, I had difficulties coming up with some way, how > to manage measuring boards and repositioning the motor. > > So it seems that lever with an encoder at pivot point and hydraulic door > damper will have to handle the measuring part.
Instead of driving the boards on their edges, drive on the broad surface with rollers like a surface planer. To auto adjust for thickness and have two rollers synchronized is a simple mechanism. Directly drive the fixed roller then from its other end run a chain to a double sprocket, then from the other half of the double sprocket to the second roller. Arrange the two chains in a V with the double sprocket in line with the pivot axis of the frame the second roller is mounted on. Springs or a a hydraulic door closer allow for automatic adjusting and holding pressure. If you must edge drive the boards, the same arrangement of chains would work. Use a smooth piece of stainless steel or UHMW for the boards to push the adjuster roller out. Combine this with a spring loaded pressure roller on the edge opposite the cutting head and you've an all mechanical system you can stuff boards through forever. Adjusting for width by moving the cutter and motor is just needless complexity. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ------------------------------------------------------------------------------ "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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
