> From: Gene Heskett [mailto:ghesk...@shentel.net] > Subject: Re: [Emc-users] Mounting spindle sensors. > > 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.
> 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 Thanks Gene. Good suggestions. I started with a front panel from an old S-100 computer. Used the mill to cut the complete part. Then after I realized it was too thick I milled it thinner. I should have started with thinner aluminium to start with. Or some thinner steel sheet. Live and learn. Just a do over. Project #42. In fact all my projects are #42. BTW, in case you missed that from the book "Hitchhiker's Guide To the Galaxy" the #42 is the answer to Life, the Universe and Everything. And more interesting, although there are claims that it's a coincidence, if you take the letters of the alphabet and assign a number to each. A=1, B=2, C=3, ... Z=26 and add but the numbers for the word "MATH" you get 42. So in fact MATH is the answer to Life, the Universe and Everything! Some trivia for the last 3 minutes of Canada Day. John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
