Old CNC Lathe Teardown: Part 2 

33:35 the conclusions are great man thanks for such an awesome teardown

I think those Clearpath motors have the ability to home by resistance. You just drive them slowly into a hard stop and they sense the home point by the rising motor current.

Life hack, is an Allen key screw is stripped, use a torx!!! Works every time. If it's the threads that's stripped....You SOL 😂 Of you need any help at all, let my know. I am an apprentice to a guy that's been machining for like 35 years and I'm learning so much so fast.

Seeing you tinkering with this lathe is strangely satisfying.

I am so pumped for this project! Thanks for sharing!

very cool and loved the idea of 3D printing parts first, look forward to the new machine!! As SKIPPER2384 mentioned you can use the clearpath "hard stop homing", it will save you a lot of trouble installing sensors or switches, we also support this on MASSO now so should be easy for you to setup. For the spindle encoder we are releasing an optical encoder which will be a perfect fit for your machine, will send one unit once they are in production so that you can add the size and mounting points to your design, good luck!

I know this is a few years late but im about to go down this path for a purpose built lathe for a specific operation. You mentioned epoxy granite, but im going beyond that and the base of the machine is going to be a Starrett PINK surface plate. yea... I know

thank you for sharing wonderful video!

You need space for drills boring bars and taps, which will stick out and take up space on the z axis. This being the case if wanting to turn, drill, bore, or tap in one operation. Add max stock stick out from chuck plus clearance plus max drill length plus cross slide width to figure out appropriate z axis length and travel. Adding a tail-stock maybe double the length figured with out tail-stock support. The stick out from the face of your collect or chuck to the back, which would pertain to what is inside the working area of the lathe needs to allow long bits/tools clearance in z, so they don't touch the back. The back being in the z- direction

You are not the only one who has an Alen key problem

aluminum and steel are corrosive together thats why the screw was rusty

3:11 that might be galvanic corrosion between the steel and the aluminum

Awesome project! If you keep it a chucker consider a direct drive spindle. It could end up a similar length to what you have, considering the shortened Z.

I wouldn't be too worried about running a belt on any of the axis. I've worked on a lot of Indistrial machines and more often than not they have a belt driven axis or two. You can also view them as an IFP ( intentional failure point) important design concept to keep in mind with CNCs: plan where you want your failure and save your motion components. Better to have a stripped belt than a sheared motor shaft any day of the week. Side story: when I was a kid in my dad's shop my dad would hand me a coffee can of bolts and a box of mismatch Alan keys. He'd have me grab a bolt and try to grab the right key. It's paid dividends as an adult lol. Many many hours of guessing and stripped screws have been saved 😂

Encoder wheel bit is super cool, never heard of that before.

Are you sure about your comment about the factory bk12 support? Most of the cheap ones dont have angular contact bearings in them. I took apart 3 or four of different sizes and they all had deep groove bearings. A 7001angular contact bearing will fit in the bk12 bearing support. The dimensions are 12mm id 28mm od 8mm thick.

You should scale that up. Instead of "desktop" do "benchtop." You'll have yourself less. Make is small once it works the way you want it to and looks the way you want to.

The abec bearing rating scale is a measure of precision and tolerance. It goes up in odd numbers to 9 (9 having the tightest tolerances). There are three companies called abec 7, abec 9 and abec 11 who all manufacture abec 5 or less bearings. I did some digging this year when I went the local extreme sports shop and bought a pack of 12 super precision abec 9 bearings for £10...

A small cordless drill or impact driver with hex bits works wonders in speeding up disassembly. Just don't try to torque up fasteners with them during assembly, that's what torque wrenches are for.

I'm also using an AC servo for my spindle, and I want to know how do you send the Index Pulse from Ac servo to Mach3?

I totally understand the idea of just wanting to build something cause you can, but what do you foresee yourself making on this mini cnc lathe?

Hi, Your are working nice, more accuracy in your projects. I searched out your channel but there is no any video where you have explained about the electronics of the CNC Lathe Machine, because i want to know about the control system of your machine that you are showing here, so please make an videos what kind of controllers, softwares, drivers you are using here.

As for control side of the the lathe i say switch to Linuxcnc. The ability to customize how the machine run and operates is all most endless. Plus I think Linuxcnc can replace those little Arduino control boxes for the two turrets with little work. I know you're thinking that you need a big old PC to run Linuxcnc but that's not true now. Machinekit a fork of Linuxcnc run on the beaglebone black a computer smaller than that maso controller. It would work with all the clearpaths motors you have plus the encoder.

The mail reason lathes and mills are made of cast iron is that cast iron doesn't deform. Rolled steel and aluminium will go into plastic deformation overtime.

Not sure about the impedance comment, i always just thought about back emf which is proportional to speed hence you need higher voltages for higher speeds

Ntn has colored seals for proper assemby (Duplex)

Are you sure that encoder disk isn't translucent to infra red?

mark allen keys and fasteners in matched colors?

Hi is in possible to her this cad files?

Just a heads up, the link to your instagram in the description goes to a dead page. I think it should be instagram.com/tabletop_machine_shop/. I'm looking forward to seeing how the project develops!

5:46 You should look into CPC Linear Rails, they are relatively Cheap, have a stainless Chipguard and these things that prevent the balls from coming out if you take them off. I don't know where you are from, but i ordered mine at www.dold-mechatronik.de . They ship to Germany, Europe and Switzerland. Edit: I watched the Video to the End and now i know that you are from Canada, so yeah. I hope it still helps you.