Re: Warm left/rear bearing

Steve Wells


I too love building cnc projects, I built a precision mini mill several years ago to engrave

South Bend Dials:


And to all those out there waiting on me to finish your projects, they are coming.

Soon, no later than late spring after fishing time, lol,  I promise, now that I have retirement

time, I can catch up, this machine is for turning the mount bushings and the dial blanks!


This lathe has been a long project, I started in the spring of last year…lol, after looking for years

for a South Bend MagnaTurn 612 to convert, I decided to just build something,

just to get a little experience with the conversion until I find the elusive 612, that I know,

is out there somewhere.


On my South Bend 2S mill, I see now that having a chip guard and chip collection system

would have been nice! I filled up my shop vac twice cleaning up.


Some machine porn and specs on my build:

The donor lathe was a late 1980’s Elgo KL-26 12.5 inch stubby turret lathe.


The Z-axis is a Thompson 2HB20, with the covers installed, it has about 12 inches of travel.


The X-axis is a Newport TR12x12, has the same travel, about 12 inches,

which I have off-set to the Turret side.


The tool turret was built by Dave DeCaussin formerly of FADAL before he passed away.

It's an 8-station stepper driven, pneumatic lock/un-lock and it's bi-directional.

with coolant nozzles. I have the plc macro code for it written but have not tested it yet.

I still must install lock/un-lock sensors on it, these were beta units for the discontinued

Fadec HTC10 and I assume, not totally completed for error logic yet.


The AC servo drives are Teknic ClearPath SDHP integrated, NEMA 34 on Z, 23 on X,

and a 134 4-HP for the C-axis spindle drive. I will be running a Centroid Acorn CNC12 controller.


Nasty grease clean-up on the spindle, and getting the clean Kluber 15 in, see photos.

The spindle has a 5c nose, a set of SKF B7212-P4S, 25-degree angular contact bearings.

running in DD(><) config in the front and an Nu310 roller bearing in the rear.

I am adapting it to drive with HTS sprockets / 8 mm Pitch, 50 mm Belt Width.

That's todays project, finishing the spindle pulley, and align it to fit in the belt pocket.

So much fun to have time to play in the shop!




From: <> On Behalf Of motopreserveshop
Sent: Sunday, February 14, 2021 7:12 AM
Subject: Re: [SouthBendLathe] Warm left/rear bearing




Looks like a cool project, but might I suggest you turn your considerable skills to developing a robotic chip sweeper? :) That floor in front of the mill looks like progress, progress, progress!!!


I designed and built a small DIY gantry-style CNC a few years ago - chassis is mostly alum tooling plate and extrusion. THK linear rails and trucks. Cheap import ball screws. Gives me a work zone of about 18x24 which I needed for some of the custom motorcycle parts. A very challenging project, but well worth the effort. And yes, many moments of stepping back, assessing, crying, and then diving back in :)


Have you settled on a control software yet?

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