03-11-2016, 01:40 PM
Something that has always bugged me about the table power feed on my mill is the POS power indicator lamp on the front of the unit. Unless you are sitting on the floor at eye-level with the indicator - you can't see if the lamp is on or not. Standing right in front of it, looking down at it, you can't see any light so you don't know if it is off or on. 
Table Feed.jpg (Size: 17.31 KB / Downloads: 108)
The power feed for my knee is a newer design that uses a ring light surrounding the rapid switch button, that is bright enough to see clear across the shop when it is on.
Knee Feed.jpg (Size: 19.11 KB / Downloads: 108)
While I have the table feed apart fixing other issues right now, I want to "upgrade" to the new style switch and power lamp. I have the new switch on order, but these Taiwanese schematics have me befuddled.
The power lights don't come on unless the power switch is turned on. But it looks to me like they are showing the power lamp connected directly to L1 and L2 coming in and not after the power switch. Makes no sense to me.
Anyway... IF I'm looking at this correctly - it appears that both lamps (new and old style) are fed line voltage through a 33K ohm resistor - is that right? So if I remove the old lamp from the PCB and solder the new lamp leads to the same terminals, life should be golden... right?
The whole reason for tearing into this is because the table feed has been getting progressively louder over time. (Growls & howls.) I've tracked it down to the lower bearing on the motor, but I am going to replace both bearings anyway. I'm waiting for the BBT to deliver them any time now...
Table Feed.jpg (Size: 17.31 KB / Downloads: 108)
The power feed for my knee is a newer design that uses a ring light surrounding the rapid switch button, that is bright enough to see clear across the shop when it is on.
Knee Feed.jpg (Size: 19.11 KB / Downloads: 108)
While I have the table feed apart fixing other issues right now, I want to "upgrade" to the new style switch and power lamp. I have the new switch on order, but these Taiwanese schematics have me befuddled.
The power lights don't come on unless the power switch is turned on. But it looks to me like they are showing the power lamp connected directly to L1 and L2 coming in and not after the power switch. Makes no sense to me.
Anyway... IF I'm looking at this correctly - it appears that both lamps (new and old style) are fed line voltage through a 33K ohm resistor - is that right? So if I remove the old lamp from the PCB and solder the new lamp leads to the same terminals, life should be golden... right?
The whole reason for tearing into this is because the table feed has been getting progressively louder over time. (Growls & howls.) I've tracked it down to the lower bearing on the motor, but I am going to replace both bearings anyway. I'm waiting for the BBT to deliver them any time now...
Willie