Machines often have both ends fixed and the assembly preloaded by applying tension to the screw.
> On Dec 25, 2023, at 7:03 PM, Leonardo Marsaglia <ldmarsag...@gmail.com> wrote: > > 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 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
