> -----Original Message----- > From: Dan Henderson [mailto:luvtof...@gmail.com] > Sent: May-06-20 10:22 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder > > My steppers are set for half stepping and are working well enough just not > blazingly fast. I�m only pushing 36v to them at the moment. The drivers I > have are limited to a max of 50v > > My main issue is the spindle motor rpm fluctuation. I�m in the process of > trying a different BOB that doesn�t appear to use isocouplers between it > and the outputs. It does however use them for the inputs. I�ll post up what > I find. I�m hoping for better results with this different brand of BOB.
Try and find someone with a real scope so you can look at the signals. I needed to capture RS232 signals and decode them for timing a few years back. The UART module for my scope is $1200 and I didn't buy it at the time because I thought I'd never need it. I have CAN bus and SPI/I2C and they are great. But instead of spending $1200 I bought one of these. https://store.digilentinc.com/analog-discovery-2-100msps-usb-oscilloscope-logic-analyzer-and-variable-power-supply/ If you can find the funds for something like this you won't be disappointed. With it I was able to discover the sender of the RS232 packets was breaking up the messages in half with a delay between that caused timeouts. Long story short I haven't used it since because I have a really nice TEK scope but it solved a problem and I'd recommend it to anyone. For example, it has a waveform generator. You can simulate an encoder with it. John Dammeyer _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
