The Micro Lathe: New Tool Changer Electronics 

Love seeing more about this project. Thanks for the update.

I have had problems with floating inputs causing my tool changer to pizza when it was supposed to french fry. I had a bad time.

You are definitely a good engineer

Another idea, you could electrically insulate the inside of your case with the conformal coating that electronics manufacturers spray on circuit boards.

I've heard that there are little things called ferrules that you can crimp onto the end of stranded wires which get you a long way away from stranded-wire-screw-connector hell. Saw it in one of the most recent AvE videos about VFDs, if you check those out (which you probably already have) you could see more on that. Looking great though! What version of Tormach mill is that?

@08:49 Multi-core wires have to terminated with a ferrule to prevent them from fraying / reducing their cross-section / coming loose when used in a screw terminal. Here's what you're looking for: www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Dtools&field-keywords=ferrule+crimp

I am rebuilding my CNC turret And I also use stepper motors The original small motor Probably not a suitable choice I put the position sensor installed in the back of the stepper motor, the use of Hall sensors In fact, I have conceived the stepper motor placed inside, but there is no way to change the motor shaft, if there is a way to replace the motor shaft, perhaps smaller size My work is relatively busy, not too much free time to diy, so It will take a long time for my small CNC turret to finish

I think you need a atc mill project!

don't worry about a bar feeder, make a bar puller! we use them in industry

to heat sink to the case maybe try adding some of the rubber thermal pad to the top of the heat sinks you already have? nice a squishy so tolerances can be quite rough

great video.. congratulations.. nice job.. we are working on a similar project, you can check our machine in our channel man..

A bar feeder is a must have. No, just kidding. For home use i would be pretty happy with a small lathe with such a tool changer ;-)

lol was the billet case really necessary? awesome project though!

Awesome looking enclosure. Would look fantastic to see anodized. I did have to look up definition of "diminutive machinists." :)

9:00 put ferrules on your wires edit: to combat the pulling I mean

Great video- I'm a bit confused about your stepper scheme- are you using the hall sensor to index position instead of just programming the stepper driver to move (Y) steps to the relevant tool position? Or are you using it as a home switch just to find tool position #1? My first few CNC projects used connectors like those DB-9's because I figured the wire was shielded and the connectors would not get full of chips- however, I have since quit those and am using either amphenol connectors or Chinese aviation-style connectors, which IMO are WAY better, and still pretty inexpensive. The DB-9's tend to get coolant and grime into the housings and the pins are really not up to passing motor currents over 2A or so.

I can't help think that you should have used D connectors with threaded fixing bolts to prevent the connectors working loose. I think the aluminium case, whilst it looks great, is a risk when it comes to potential shorts. Be aware that the more voltage you drop with your voltage dropping Arduino power board the more heat it will produce and heat sinking may be required at 24 volts. Your tool turrets look great!

The machined enclosure is very beautiful, forget extruded profiles with caps or 3D-printed plastic. If something shorts out one day, it will be worth it, haveing had the pleasure of looking at the machined case.

Great looking case. It's easy to line it with Kapton sheets. You can get them from McMaster Carr and some have a silicone adhesive backing. If you have your controller track what tool position is currently active, and if your controller knows how many steps between tools, when a change tool command comes, it's not hard to figure out how many steps to get to the target too, plus a wee bit more so you can back up and hit the ratchet pawl. But your motion control scheme should be a reiterative loop that minds the speed ramp starting out and lets you accelerate to max speed and automatically know when the number of remaining steps to go is below a certain value to start ramping the speed down. The trick with steppers is to minimize rotating mass and friction.

this is so cool, cant wait to see the machine going with full tool changes, great job!

11:15 jaws anyone?

Do you sell these?

I would totally buy the turret from you. :)

Or you can buy a cast alu Hammond enclosure.