On Dec 27 2015 10:14 PM, Jon Elson wrote: > On 12/27/2015 10:05 PM, EBo wrote: >> What is the stepcount on the encoders? If they are not >> wicked high, you might be able to replace them with one of >> the AMT capacitive encoders (which have a programmable >> resolution). That might get you up a bit, but the wear >> will have to be addressed by adjusting or rebuilding most >> likely. > > The AMT encoders are mediocre at best, they have high lag in > the interpolation under high acceleration. > I'm sure the encoders on this machine are fairly high > resolution. Anyway, this is a machine that cost over $100K > 15 years ago, it is VERY high quality. But, the software is > all in ROM, and there are NO documents at all on internals. > So, changing the encoder resolution would be difficult. Why > do you assume low encoder resolution is the cause of > un-repeatability? it is almost certainly mechanical in > nature (worn ballscrews/nuts or linear slides). The > programmable resolution of the machine is 0.01mm, I'm just > guessing the encoder resolution is somewhat higher.
I was unaware that the AMT encoders had any lag problem. I will need to look into that. I also did not assume that it was an encode issue, thought if you could bump it up then you might be able to eek out a little more res from your machine. That would likely be at the expense of speed. I thought this was on a machine you had code for, but I stand corrected on that, and as mentioned in my comments that a rebuild was most likely needed (meaning ball screws, rails, etc.) >> It would take someone who either has the will to retrofit >> a machine for funzies, or wants to build something like >> the BlackToe PnP machine I linked to before. I do not have >> a need for a PnP machine at the moment. Maybe someone else >> has one with a blown controller they do not mind having it >> played with. > > Yes, those can be found on eBay from time to time. but, it > would not be a weekend project! I take on plenty of projects that are not weekend projects, but I have no need for a PnP. EBo -- ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
