The Shop > Tools
Is your 7x lathe really off?
steampunkpete:
I can confirm what has been said:
The "Forward-Off-Reverse" toggle switch disconnects the motor from power.
The speed control knob has no "Off" position (what would be the point when the "Forward-Off-Reverse" toggle switch has an "Off" position?).
Leaving the "Forward-Off-Reverse" toggle switch in either "Forward" or "Reverse" whilst working on the chuck should be avoided; I've seen my chuck suddenly make a few turns when I've left the toggle switch in "Forward" and the speed controller at minimum. I suspect the cause is a fluctuation in mains voltage causing a transient in the controller.
The toggle switch has an "Off" position for a reason; it would be wise to get into the habit of using it.
If your lathe is second-hand the speed control pot may have been replaced with a pot with an integral switch, or you may just have an idiosyncratic pot.
modeldozer:
The switch incorporated with the speed control pot is a safety mechanism, forcing one to turn the pot to minimum before switch on. It does not disconnect power from the controller. The NVR on/off, e-stop should be used for switching on and off.
Cheers
Abraham
steampunkpete:
--- Quote ---The switch incorporated with the speed control pot is a safety mechanism, forcing one to turn the pot to minimum before switch on.
--- End quote ---
I haven't got that on mine - yet another variation on the theme.
SwarfnStuff:
Hi and thanks again all,
As I posted this on the Yahoo 7x12 site too I have got many responses and good input. Of particular interest to me was from John Lindo that by setting the gear lever to neutral it gives better feel when threading by hand in the lathe plus avoids the possibility of getting caught by suddenly moving bits. All agree that cutting the power by some positive means, preferably unplug power or press emergency stop when hand cranking or adjusting the chuck etc is just plain good safety practice.
John B
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