On Mon, 2013-08-05 at 19:42 +0100, andy pugh wrote: > On 5 August 2013 18:34, Sven Wesley <[email protected]> wrote: > > As you might know (according to recent mail activity) I'm going to build a > > new machine. My plan is to use a mesa card setup and the machine will > > support 5 axis, but I will start with three... ...I think. This is where my > > need of decision support comes in. I have always used servo's even on > > smallest machines. But when I look at the stepper setups, they are like > > half price even if I go with beefy motors. > > My experience with steppers is limited, but the small NEMA 23s are > quite nice, however the bigger NEMA23s became noticeably more > "sluggish" which rather counted against the increased torque as far as > performance was concerned. > I can imagine that the big stepper motors continue this trend, and get > stronger but more ponderous. > > Having built a stepper machine initially I decided on a servo machine > for the second build, and have so far not regretted it. Just the > repeatability of index-homing is a big plus to me. Eh? however the bigger NEMA23s became noticeably more "sluggish" Maybe NEMA43's .....
I've been wanting to say this for years: If steppers were to suddenly disappear then this list would be surprising quiet. Most traffic comes for problems with steppers. I do think there is an initial learning curve with servos but once you get by that you tend to have less problems. Certainly if money is a problem then entry into servos may more phased but 10-12 years ago STG and Jon's PPMC were basically the only options. STG is ISA so pretty much out of the picture. Jon's PPMC is a high-end control (who else has 16 bits?) but there are much less expensive alternatives available today (12 bit) however I'm not aware of any in with 16 bit resolution. just my tuppence (not adjusted for inflation) Dave ------------------------------------------------------------------------------ Get your SQL database under version control now! Version control is standard for application code, but databases havent caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out. http://pubads.g.doubleclick.net/gampad/clk?id=49501711&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
