On 2/21/21 10:15 AM, nkp216 wrote:
How to calculate the accuracy of the resolver?
1.Does this calculation make sense?
https://forum.linuxcnc.org/27-driver-boards/39629-1988-fadal-4020-conversion-thoughts-mesa-6i24-7i49?start=10#176312
2. And if the gear ratio is made 1:5 ?
On 2/21/21 10:15 AM, nkp216 wrote:
> How to calculate the accuracy of the resolver?
>
>
>
> 1.Does this calculation make sense?
>
https://forum.linuxcnc.org/27-driver-boards/39629-1988-fadal-4020-conversion-thoughts-mesa-6i24-7i49?start=10#176312
>
> 2. And if the gear ratio is made 1:5 ?
FYI - My Mazak had IIRC a 7:1 gearing from servo shaft to resolver on
the end of the motor.Resolvers tolerate rpm rather well. The problem is
not so much accuracy as it is enough counts to yield good servo
control. More is better as it helps the quantization error at low
speeds. I went with Koyo 4096 cpr encoders on the end of the ball
screw. 10 mm pitch on the ball screws. Jon Elson had a good post on
this many years ago.
I drive an encoder off a small idler for the Z on my small mill. Gets me
something like 100K c/in.
There was a real difference in the ease of tuning when I went from glass
scales at 5000 counts/inch to encoders at 16384 c/in. Ideally one uses
both. Shaft encoder for velocity and glass scale for position. See the
wiki for details.
Dave
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