I am busy with mine at this very moment. What I did to overcome the quill issues was to remove the hand wheel and spring assembly and fit a motor with reduction directly to the shaft that turns the quill up and down. Mine has a very tight fit and no noticable backlash. The small hand wheel on the other hand was poor. I tried to use the spring to counter the backlash but it was not a good plan. I use nema 34 motors on the whole conversion. If you are interested, I could pass the design files on to you.
On 2013/06/21 11:02 PM, Tomaz T. wrote: > I'm thinking about converting my jet jmd-18 mill/drill with round column, but > thing that worries me the most right from the start is, if Z axis would be > accurate enough. > > There is one solution by reversing quill spring so it is forcing axis all the > time downwards and this way you get rid of backlash on worm gear, next thing > is how solve problem with quill lock, which is meant to be used when quill is > in desired position (height) so you lock it to increase stiffness (and > accuracy) on Z axis. > So did anyone here did any similar conversion and have a solution or > suggestion for this? > > here is machine's pic: > http://www.rustan.ru/sites/default/files/JMD-18F.jpg > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 130621-2, 2013/06/21 Tested on: 2013/06/22 12:13:56 PM avast! - copyright (c) 1988-2013 AVAST Software. http://www.avast.com ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
