On Tuesday 07 July 2015 11:18:16 Gene Heskett wrote: [and snipped] Since I wasn't able to make brass standoffs that held the disk straight, I decided to make a spacer sleeve. Which with company was slow getting started, but I think I know where its hiding in a block of alu in the lathes chuck ATM.
ID is bored thru about 28mm of an alu 3x3 block, the OD was turned to give a clean surface, block turned around in chuck and re-centered to within half a thou, and the outer 21mm of the z is in process when the local radio station called & I had to round up enough stuff to go work on a 60 yo Gated 1kw transmitter. Rest of day shot. Company also decided to go hit her sisters place in Norfolk VA, so they left a day early. But that put way too many miles on these fading legs, so sleep was obtained in 2 hour bits, leg cramps, & eating tums for that like they were M&M's. Now, just to be consistent, when this 21 mm has been carved to the correct OD, that leaves a ledge the chuck is gripping, about 1/4" thick and a nice point to use to clamp it down on the small mill. I am going to put a switch var or 2 in the disk code so I can skip the very time consuming slot cutting, and added 2 more bolt holes offset 30 degrees from the other 6, so I can use those marks to drill a 3mm clearance hole about 22mm into the wall of this sleeve. I have also reduced to hold down holes to about .080" and will use those holes as spotters to drill about 1/4" deep with a 3/64ths drill and tap that for 0-80, using a flat headed 0-80 screw so the disk will be well self centered. The extra 2 holes, which will get 3mmx25mm cap screws will screw into the 2 holes in the top of the spindle drive, which do not rise & fall with the side crank, and which are currently holding the disk that drives the rpms display. Those holes will be expanded enough to allow the wrench for the 3mm cap screw to pass thru, and the sleeve will be relieved enough so that the head of the screw will sit just deep enough that the disk will not touch it. Once all the holes in the sleeve are made, chuck it back up in the lathe and slowly turn that mounting foot off, leaving me about 18mm of sleeve length, which will put the opto's, base end sitting on the motor mount plate at about the correct height relative to the disk. My opto kit will be on two boards, one to hold the opto's, and one to hold the logic (a 74ls06) that will make good waveforms out of the crap .8 volt swings I got with these opto units. Once thats been done, next question is, is there an ebay market for the sleeve, disk, and opto kit & screws to do this on anyone elses GO704? This is such a major PIMA to fit, it seems like there should be a market for it. The GO704's spindle, with the fixed height rotating parts buried so damned deep, it has likely discouraged others from doing this. And it locks them out of doing rigid tapping. So its going to work or else..... Yeah, I know, I am digging a deep enough hole I should stop. But thats just me, being me. Just like my solution for a z drive on the toy mill. As you can see on my web page, its butt ugly, but it works! 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
