Some pics & a few gotcha's.
Before I did this I tore the lathe down & painted it, seemed like a good time to do it.
While I had it apart I added O rings to the selector lever shaft bushing as it was starting to get dribbly there
I went with the iSV synchro motor & the 6:1 reduction. The change gear intermediate shaft got repurposed to hold the combo cogs.
The control panel got mounted in the change gear cabinet, while I was at it I took the opportunity to move the power & direction switches there as well- I never liked having them down on the lead screw control box
The encoder mounts to the end of the change gear drive shaft but the first time I fired it up it shook so violently I thought it was going to fly apart. It turns out the end of the shaft where the gear fits is off center by 4 thou and even worse the bolt hole is out by 16 !?!
I have no idea how the factory managed that but I ended up fabbing a corrective adapter with an off-center bore.
Eccentricity is now less than 2 thou.
The encoder mounts to a fork that bolts to a piece of square tubing welded to the cabinet. There's enough room left that I can put the change gears back in in case of a power outage
The electronics go in a utility box of the type commonly seen housing security systems etc. Found it in the trash at work
A bit tight but everything fit. I did add some vent holes in the back of the box.
Although it was working quite happily with plain ribbon cables & loose wires I did go shielded for the final install; I was careful every shield got bonded at one end only & each connected to a single point ground.
Some obligatory idiot proofing-
& it's Done.
Before I did this I tore the lathe down & painted it, seemed like a good time to do it.
While I had it apart I added O rings to the selector lever shaft bushing as it was starting to get dribbly there
I went with the iSV synchro motor & the 6:1 reduction. The change gear intermediate shaft got repurposed to hold the combo cogs.
The control panel got mounted in the change gear cabinet, while I was at it I took the opportunity to move the power & direction switches there as well- I never liked having them down on the lead screw control box
The encoder mounts to the end of the change gear drive shaft but the first time I fired it up it shook so violently I thought it was going to fly apart. It turns out the end of the shaft where the gear fits is off center by 4 thou and even worse the bolt hole is out by 16 !?!
I have no idea how the factory managed that but I ended up fabbing a corrective adapter with an off-center bore.
Eccentricity is now less than 2 thou.
The encoder mounts to a fork that bolts to a piece of square tubing welded to the cabinet. There's enough room left that I can put the change gears back in in case of a power outage
The electronics go in a utility box of the type commonly seen housing security systems etc. Found it in the trash at work
A bit tight but everything fit. I did add some vent holes in the back of the box.
Although it was working quite happily with plain ribbon cables & loose wires I did go shielded for the final install; I was careful every shield got bonded at one end only & each connected to a single point ground.
Some obligatory idiot proofing-
& it's Done.
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