9x20 Lathe Spindle Motor E-stop
Last updated on
Sunday, September 07, 2014 06:06:51 AM Eastern US Time Zone

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E-stop, Switch Wiring, Upgraded Lathe Control Group

WARNING: SHOCK HAZARD.
FIRST UNPLUG THE LATHE MOTOR FROM THE 110VAC OUTLET
It is good practice to activate the E-stop button while setting up the lathe.

E-stop

An emergency stop button for the BD-920N Jet lathe. The housing was cut at 38 from an aluminum enclosure.

Switch Wiring

The stop button interrupts the hot, 110VAC line-in (L1). 
BD-920N manual
The two red switch wires pass through an insulating rubber grommet.


Though over-rated, the two switches (STDP) were wired in parallel for redundancy & less current per contact.


The back panel bracket extends down to allow attachment to the lathe's
steel switch cover using two, 10-32 bolts screwed into tapped holes.

Upgraded Lathe Control Group

Red E-stop, ON/OFF (Inhibit), variable speed potentiometer, & CCW/CW spindle rotation direction.
The E-stop cuts the 110VAC to the entire lathe but the spindle ON/OFF circuit utilizes dynamic braking.
This is a good E-stop location for me as this is where I rest my left hand to manipulate the controls.
I also feel that when one is working close to the lathe & the red button is located at the front of the
machine, it will be harder to hit stop due to the crowding of one's arms & torso in that area. It is easier
to extend an arm & swat a button down than to retract & push inward. These are personal preferences.
Also see the E-stop for the Taig CNC mill & the variable speed DC spindle motor modifications.

E-stop, Switch Wiring, Upgraded Lathe Control Group

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