mike calabrese
03-18-2022, 2:43 PM
Hey gang
new here and woodworking again after about 20 years printing tee shirts.
An interesting thing happened with my new Grizzly G0733 lathe I will share for what it is worth.
Note I am not much on electronics but have kind of an engineering background.
I just built a 17 inch diameter donut chuck using 3/4 birch ply, (it has a lot of inertia once spinning). working on a couple larger diameter bowls I used the speed change knob to shut down the spindle.
My heart stopped when I tried to restart the spindle........ the motor was dead, nothing going on not even digital readout on the headstock.
I thought I fried something on a brand new lathe.
Fortunately after about 3 minutes I was able to restart normally and all is good again.
I suspect what happened is some kind of feed back electrically from the rotating spindle back into the inverter or some of the electronics???????
What i noticed was on spin down (using the speed knob) there seemed to be a drag on the spindle speed and it slowed kind of quickly to a stop.
Conversely when cutting the power either with the forward / reverse switch or start / stop buttons the roll down to stop took considerably longer and was a smooth roll down transition.
So what I am suggesting / guessing, and will do from now on is cut the power when I have a high inertia load and possibly save the inverter or some other electronic component.
calabrese55
new here and woodworking again after about 20 years printing tee shirts.
An interesting thing happened with my new Grizzly G0733 lathe I will share for what it is worth.
Note I am not much on electronics but have kind of an engineering background.
I just built a 17 inch diameter donut chuck using 3/4 birch ply, (it has a lot of inertia once spinning). working on a couple larger diameter bowls I used the speed change knob to shut down the spindle.
My heart stopped when I tried to restart the spindle........ the motor was dead, nothing going on not even digital readout on the headstock.
I thought I fried something on a brand new lathe.
Fortunately after about 3 minutes I was able to restart normally and all is good again.
I suspect what happened is some kind of feed back electrically from the rotating spindle back into the inverter or some of the electronics???????
What i noticed was on spin down (using the speed knob) there seemed to be a drag on the spindle speed and it slowed kind of quickly to a stop.
Conversely when cutting the power either with the forward / reverse switch or start / stop buttons the roll down to stop took considerably longer and was a smooth roll down transition.
So what I am suggesting / guessing, and will do from now on is cut the power when I have a high inertia load and possibly save the inverter or some other electronic component.
calabrese55