Still undecided as how to resolve the tool change challenge.
I am deliberating on two solutions
Option #1 Use a DC servomotor like a Homeshops 850 oz-in
and a drive like the Gecko 320. This will allow positioning the
spindle with plenty of accuracy and spin my cutter at around 3,000
RPM. Since the Gecko drive has a step and direction input I hope to
be able to reconfigure the HAL code to use A step generator to control
the spindle rather than the PWM generator.
The one downside is less horsepower than I would like. Using the
servomotors I have seen with a gecko 320 delivers a shaft power output
less than 1HP, I would prefer 2HP. I continue looking for alternative
motors and drives that could provide more HP. Suggestions welcome!
Option #2 Use a Variable frequency drive like a Durapulse GS3 this has
A flux vector mode (as suggested by Andy also thanks for the video clip)
and a inverter grade induction motor. I have talked with techs that work
for vendors of these types of drives and have received conflicting opinions
as to whether I could position the spindle with enough accuracy for my
tool change. I suspect this would work but it could also be an expensive
disappointment!
It would be very helpful if I could locate some one who has real world
experience using these new variable frequency drives, particularly if they
are using EMC2 also.
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