On Thursday 27 March 2014 09:23:24 aaron moore did opine: > Hi > I am having trouble getting my router to run a fourth rotary axis > nicely. It does the job. but rapid and cut speeds both seem very > inconsistant. I notice that there is a configuration page for such a > machine on the wiki site, but it looks pretty complicated. What > benefits does it have over simply configuring with the stepper wizard, > and if it does improve performance, I would be grateful if someone > could talk a complete ejit through setting it up. Here she is speeded > up x a zillion http://www.cnccraft.co.uk/3-dimensional-work/ Thanks > Aaron
I have been doing this intermittently myself but usually in steel. But my rotary axis is a 4" 90/1 table I motorized. What I see (poorly, video stutters on this machine) would represent about the top speed my table can do with air injection. That section of my .ini file: [AXIS_3] TYPE = ANGULAR HOME = 0.0 MAX_VELOCITY = 36.0 MAX_ACCELERATION = 100.0 STEPGEN_MAXACCEL = 200.0 SCALE = 320.0 FERROR = 1 MIN_FERROR = .25 MIN_LIMIT = -100000000 MAX_LIMIT = 100000000 HOME_OFFSET = 0.0 HOME_SEARCH_VEL=0.0 #HOME_SEQUENCE=3 BACKLASH = 0.056 velocity's are in degrees/second, meaning it would take 10 seconds to turn one full turn. But because I have the bearing pulled down tight to try and constrain the backlash when its at position, there has been a air port drilled into it, and a small groove cut into the castings mating face, to allow an air hose to pressurize it, lifting the table free enough to turn when it needs to turn. Otherwise I had better run it much slower, giving the 252 oz/in motor enough torque to move it. For most of what I use it for, like drilling the flash-holes in a #209 nipple, or carving the hex wrench flats on the nipple, the tool is not in contact with the work until it has reached position. You didn't say how your table is being driven, and the video doesn't show it, but for fancy engraving or carving (table?) legs such as I see there, I think that since the wood doesn't need the holding power of a 90/1 worm drive, I would use a timing belt setup with a high, say 10/1 tooth ratio. Maybe even in 2 stages to control the size of the pulley's. From a 425 oz/in motor, that should be more than enough holding power to carve that oak, white ash, or cherry at speeds high enough to control cherry's want to burn if the tool is kept clean and sharp. With enough voltage into the driver, I'd guess you could do a turn a second or more while maintaining a small fraction of a mm for accuracy. > Tel: 01209 890084 > Mob: 07805686188 > Email:[email protected] > Web: > www.cnccraft.co.uk > www.re-formfurniture.co.uk > ------------------------------------------------------------------------ > ------ _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
