How to go about a lathe CNC conversion with no lathe modifications. 

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-pAftLQ4Ak4w.html check this one out too mate, it is an elegant example of an easy CNC conversion

... I just measured t-slot bed to center height and it seems like my lathe (Sieg SC4) is quite a bit smaller than yours, so it turns out I will have to spend some time fighting Fusion, but at least there's an excellent starting point to refer to!

Thanks! I've recently created a v2 of this in steel. When I get a moment, I'll publish the 3d model.

@@girvawPlease do, thanks for sharing

Thanks !

Thanks for your feedback.

Thanks. The PC requirements for LinuxCNC do not appear to be too critical. Until recently, I used a 15+ years old i686 32 bit machine running Debian Wheezy. It ran fine using the built-in parallel port to drive the steppers. Due to unsupported packages on x32 I recently replaced the motherboard with a 10+ years old i7 x64 board. This board doesn't have a built-in parallel port, so a PCI parallel port was added. This revealed some compability problems. I eventually settled on a NetMos parallel port. Unfortunately the outputs were unable to drive the opto-isolated stepper driver inputs, so I ended up constructing a buffer using 2 x 74HC541 octal buffers. Works fine now on Debian Buster.

Thanks. It would be possible to produce these, although I doubt that it would be a very profitable venture - the linear guides and carriages aren't particularly cheap. That said, it's been a tremendously useful tool. With careful setup, it can produce parts of excellent quality and precision.

Indeed. That would be a good addition.

Exactly i was bamboozled when he said we can't thread kek

Hi. Thanks! This has been an extremely useful tool. I did a significant upgrade to it last year, replacing the aluminium plates with 15mm steel plates. It's now extremely rigid and very precise with all linear rail mounting surfaces having been surface-ground. It can already do thread-cutting: See my video on the making of a spindle encoder.

@@girvaw prosze o film z modyfikajcą modułu - płytami stalowymi 15mm

This has been a very useful project that I use relatively often. There are a couple of ways to use the tailstock. If your lathe bed is long enough, take the tailstock off and put it on the chuck side of the carriage. You would also want to position the z-axis stepper off to the side to keep it out of the way of the saddle. Another way is to make your own saddle that is fixed to the CNC table. Good luck!

@@girvaw thats great info thank you! do you happen to have a parts list for what you used?

@@guitarchitectural I don't have a formal parts list. When I have a moment, I'll put one together.

Thanks. I'll publish the 3d model to Grabcad when I have a moment. Will message you when it's up.

@@girvaw That would be great! Thank you very much!

In fact, I had already uploaded the design to Grabcad ! grabcad.com/library/lathe-cnc-table-add-on-1 Good luck if you decide to build one. I've found it to be a very useful tool indeed.

Nice! I'll go give it a try, hopefully it turns out as good as yours . . thanks again William!

C'est effectivement une très bonne alternative, le seul souci c'est que tu peux pas faire de filet. J'imagine que ca dû coûter moins de 750$.

@@laurentc.8742 peut-être pas son système à lui, mais j'ai vu d'autres qui se connecte avec un encodeur sur le mandrin et en mesure de faire les filets

Hi. I'll publish a parts list when I have a moment.

@@girvaw Thanks

@@girvaw parts list would be amazing!

Some people don't want to irreversibly modify their lathes, or want to retain the capability for full manual use, so your entire comment is pointless.

@@trevfindley5704 if you want to retain the capabilty of manual operation, converting to cnc is pointless.. if you want automatic threading, ditch the handwheels and go cnc.. there is no way in between..

@@JanBinnendijk For myself, others in the comments, and of course the video creator, this seems like a really useful way of having both capabilities. Why are you so invested in disagreeing? It just comes across as really rude and mean-spirited...