On Friday 02 July 2021 01:42:25 John Dammeyer wrote: > Progress. This will ultimately be metal since I don't trust the > plastic to be stable and the encoder disk is perhaps a tad thick for > the slotted sensors. What you see underneath the yellow plate are > stiffeners. Likely a 6mm thick steel plate wouldn't need this. John
Looks real good John. I'd think 1/8" alu panel stock would be plenty stiff enough for that. 1/4"|6mm steel seems like serious overkill. With regard to the comment about disk thickness, its a small effect, but the thicker disk has more effect of the edge diffraction, so you would get sharper rise and fall times from a thinner disk. One way to reduce the rise & fall time if it is a problem would be to cut the disk with an engraving tool, because the 60 degree v would leave a single sharp edge but that would also tend to give small errors if your z depth is shakey or the disk isn't optically flat. If using the engraving tool, turn the disk over to put the sharp edge, narrower opening towad the led in the interruptor, less chance of an errant reflection from the angled face that way. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
