On Tuesday, February 01, 2011 09:39:56 am Mark Wendt did opine: > On 01/31/2011 12:08 PM, gene heskett wrote: > >> I was suggesting using your gantry as a planer head. > > > > So would I, but first, because its alu, I have to ask: Is is alu for > > some reason related to interaction with the bamboo?, or just for the > > expediency of construction? > > > > I would, because the alu will eventually wear, consider overlaying the > > alu with twin strips of steel, epoxied to the alu bed so that the > > vacuum slot is not effected, but raised by the thickness of the steel > > strip. This would, I think, give a longer wearing surface after the > > top of the strips were ground dead flat to whatever sag may be in the > > carriage rods, using the gentle touch of a drill doctor wheel to do > > the actual grinding. > > > > That would of course bring up the thermal effects on the flatness as > > it would probably only be truly true to the carriage at only one > > temperature, tending to warp up and down with the thermometer > > reading. I can think of ways to control that, all of which are a > > bigger PIYA though. > > > > Grinding the alu to flat is not a workable idea because of alu's > > tendency to plug up the grinding wheel, not even the drill doctor > > wheel would be immune to that. Thought, flood the alu with k1, lots > > of it, recycling the runoff, and still use the drill doctor diamond > > wheel, but turning slowly enough so as not to throw the K1 all over. > > This should help prevent the wheel from plugging up to a large extent > > by keeping its surface wet. Move the carriage slowly, say 2-4 hours > > to make one pass, feed it a thou closer and retrace, repeat till a > > clean cut is obtained. > > > > I have no idea how long an aquarium pump would last pumping k1, but > > that should be an ample flow rate to keep the area flooded and clean. > > You would, with the diamond wheel, be cutting an un-oxidized surface > > once the initial cut has been made, or as least an only slightly > > oxidized surface due to the oxygen reduction the film of k1 assures, > > making the wear of the diamonds much less. > > > > Can you show us a piccy of this track from the end on view? With a > > tape measure for scale? > > Okay, here's some pics of the hold-down bed and the cutting head. > > First, an unadulterated pic of the hold-down bed: > > http://farm6.static.flickr.com/5217/5407421436_d806332728_b.jpg > I am having trouble visualizing exactly where the bamboo strip lays, and have the saw blades been removed while you do this work?.
> Next, with Gene's tape measure... ;-): > > http://farm6.static.flickr.com/5011/5407421544_6c86112d0d_b.jpg Sorry, I meant crossways so I could get an idea of the width of the surface you are cleaning up. My bad for not saying so. It also appears that you are pretty space constrained around this machine. > > Quick and dirty view of the cutting head: > > http://farm6.static.flickr.com/5293/5407421640_9da64c20c4_b.jpg > > And last but not least, the entire cutting head: > > http://farm6.static.flickr.com/5254/5407421742_99bee52187_b.jpg If the surface being cleaned up is that nominally 1" wide face that looks like it has a row of holes in its top surface, then the grinding idea is probably not feasible because its alu & wider than the drill doctor wheel. That leaves the thought of mounting the file to the bottom of the carriage, and using the x motor to do a drawfile action if the file is sharp enough to cut with the light touch of just skimming the high spots. If you had a nema 34 motor that could be swapped into the x drive temporarily, that might work. Or it might be overkill because it would flex the frame with its power. Two other thoughts come to mind, one is that since I can see adjustable legs that appear to be supporting the relatively light crossbars this track rides on, how solid is this floor? Another thought might be to rig some rollers that would resemble a belt sander, with the belts backing platen being the lowest, active sanding area and wide enough to cover the track, but I'd say the construction time for that, effectively making a 'stroke' sander out of the carriage, would exceed the time it would take to finish scraping it with the file. Considering the relative lack of precision in the thickness of the backing media of whatever the belt might be made of, I don't see that as arriving at the desired final result. How are you 'marking' the high spots now? And how much error now remains? > I've got about 70% of it draw filed and scraped. I'm gonna need Gene's > hydraulic can crusher with all the spinach I've been eating. ;-) :) > Mark -- 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) <http://tinyurl.com/ddg5bz> You humans are all alike. ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
