Hello Linden, For your first question. I would mount the motor on a fixed end just to be sure, so that would lead you to make both ends fixed. I guess you can mount your servo on a non fixed end if the machine is not going to be used for heavy cuts on hard materials but I would go the extra effort and make the assembly fully supported.
Second question. I don't know what's your max rpm for the spindle or what's the softer material you're planning to machine but with 3000 rpm of max speed on your servo you can easily do a 2 to 1 reduction (if you have the room for the pulleys). That would give you 7500 mm/min for rapids. I don't know what power and torque your servo can provide but I assume 2 Nm at least on continuous so with your 5 mm and the 2 to 1 on the pulleys you can have 4000 N of linear force on the carriage and I think that's more than enough. Hope this helps! El lun, 25 de dic. de 2023 21:08, Linden via Emc-users < emc-users@lists.sourceforge.net> escribió: > Hello All, > > In the early stages of converting a 13 x 24 inch manual Chinese > lathe to run with Linux CNC. > > I have 2 questions regarding replacing the Z axis lead screw with a 3205 > ball screw: > > What I am thinking is mounting the fixed end in a pillow block at the > head stock end of the lathe and the floating end in a second pillow > block at the tail stock end of the bed. The question I have is there any > reason I shouldn't drive the ball screw from the floating end? My logic > for driving at the floating (tali stock) end is 1 I have more room for > belt reduction at this end and 2 with the fixed end of the ball screw > at the head stock end is that the ball screw will be in tension when it > is pulling the carriage toward the head stock during cutting and less > likely to flex or bend. > > The second question I have is what would be a realistic cutting speed > range for the ball screw in RPM? The servo motor I am using has a top > speed of 3000rpm and I am trying to figure out reduction ratio that is > realistic. > > Thanks in advance for any help or suggestions. > > > Linden > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
