RE: [CAD_CAM_EDM_DRO] EMC2 DC-servo controlled minimill

Les wrote.
A good way to check if a motor is likely to do well is to run it from a 1.5V D cell. If it turns smoothly you are on to a winner. If it won't turn at all or is very jumpy then it probably won't be very good.


Never thought to try that. Makes sense.
Thanks Les!


To: CAD_CAM_EDM_DRO@yahoogroups.comFrom: les.newell@...: Tue, 13 May 2008 09:12:45 +0100Subject: Re: [CAD_CAM_EDM_DRO] EMC2 DC-servo controlled minimill




I have to admit I was slightly surprised at how well they work. I think the key is that they are designed to drive a treadmill smoothly over a wide speed range. A good way to check if a motor is likely to do well is to run it from a 1.5V D cell. If it turns smoothly you are on to a winner. If it won't turn at all or is very jumpy then it probably won't be very good.Note you won't get anything like the quoted power out of these motors when using them as servos. They are designed to run fast with forced air cooling. Servos tend to run slowly and you don't want to have to use forced air. I use 220V motors, driven with 80V on my BP. With 0.2" pitch screws, a belt ratio of 4:1 gives me reliable rapids of around 2.5m/min (100IPM) with plenty of torque.Lesshawn c wrote:> I'm using two for sherline spindle motors. I assumed that they would be a little coarse for servo motors judging from the comutator segments, but if they work for you guys maybe I'll give em a wirl. Whats the best motor encoder for EMC? I use 500ppr's for Mach and I have quite a few US digitals laying around. Do you guys recommend higher resolutions?Shawn>







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