On Tue, 15 Jun 2021 at 01:31, andrew beck <andrewbeck0...@gmail.com> wrote:
> I have a two speed gearbox in my cnc lathe > > with hydraulic solenoids to change gear You have the same setup and the same requirements as me, so I expect that my HAL component will work for you. It uses a 3-position switch to select auto, high or low ratio. It also monitors motion-mode and will try to do a "double declutch" gearshift during a G0 move if it is in the wrong gear. This is currently at best a "partial success" as it tends to get confused during facing operations (it gets to a small diameter, decides that it needs to shift to high, goes in to neutral as the tool moves back to the OD with a G0, then realises that the commanded speed is slow again, by which time it can't quite catch it before the spindle coasts to a halt. This also happens on up-shifts (just like it does on our 1916 fire engine with a crash box, for exactly the same reasons, the motor runs down slower than the spindle so the motor can't "catch" the spindle) Whether it will work better for you depends on the responsiveness of your VFD and spindle. If you have realtime spindle control and a braking resistor is will probably work better for you than for me. I need to pull the lathe away from the wall to access the VFD so have not taken the simple step of fitting a braking resistor and increasing the motor ramp-down rate. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912
gearchoice.comp
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