Greetings everybody; Working on the drive shaft for the x screw in this Sheldon.
1. I have 1/2" A2 rod, IOW 12.7m's in diameter. 2. I've already cut 50 tpi threads, both straight and tapered, on the inner end. The tapered section will have 6 slots cut into it by EDM, and a tapered thread nut will then put the squeeze on the 6 fingers formed by the cuts, with the squeeze being the grip on the end of the screw. For both thrust and rotational forces. 3. I'd like to use a 12mm bore timing pulley on the outer end, and another 50 tpi nut to adjust the load/preload on the roller bearing thrust washers I am installing on the OEM crossfeed handle bearing screw-in that exists now but with a counterbore in the outside end, probably covered with a felt swarf washer. I have taken some pix, but they are still in the camera. But, 50 tpi's thread depth calculations tell me the bottom of the threads valley will only be 10.95mm in diameter. So in order to get the nut to the full depth threads behind what should be a fairly smooth 12mm shaft to fit the stock 12mm pulley bore, I am going to have to cut a partial thread the full length of the shaft just to get the nut to the full depth threads. Obviously I'm not excited about that. So, should I do that, or go ahead and turn the shaft on down to 10mm's and order pulleys accordingly? I have some fresh, green, threadlocker to enhance the grip in any event. And I have to chuckle at the vendor who sold me the 1500mm long 2505 screw kit. The end of the screw is 10mm's, and the flexible coupling to hook it to a motor? Its 6mm's on the motor end. But my motor has a 15mm double flatted shaft. No common sense west of the big pond... That too will be belt driven. And I'm scanning ebays offerings for a pair of rubber bellows type boots to cover this screw with. Just haven't found what I think I need yet. The *667 hall sensors, and a decent motor mount (assembled bass ackwards of course) fell out of the mailbox today, so some of it is coming together, faster than I can make use of it. But its progress I try to tell me. 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
