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Maho Z Axis - Servo Conversion (Patreon)

Published:
2020-08-01 21:33:38
Imported:
2026-06
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Content

Am very excited to see the first pieces of the Maho under PC control!

Hoping to learn a lot about EtherCAT and servos.  So far, still black magic.

Files

Previews only

MAHO: Move'n On Up!

Today, automating the milling machine's Z axis. Tomorrow... the world! Finally started hanging servos on the machine.

Comments

Chris Cook

I knew he liked us best!

JC Wren

Very cool! What was the little handwheel thingie with the cord?

Scott

Does that shaft need oil lube at all? Was it previously filled with hyd oil? Would that dampen some noise too?

Micah winters

Please explain how a ball screw works. I looked it up and am still confused.

Micah winters

Please explain how a ball screw works. I looked it up and am still confused.

Chuck Kirchner

You couldn't get the spline shaft out BECAUSE you were probably using an ANALOG spline shaft remover when you should have been using a DIGITAL one. Geez, anybody who can't choose the right boring bar shouldn't be spline shaft removing, either!! Dammit!!, I pay you good money and I demand a return on my investment. Now get back in there and show me what you got!!! Also, stay safe

Denny

Next you tell us you check your german machine with imperial right angles.

Jeffrey Bellman

Absolutely fascinating. Great video, very interesting series. Thumbs up.

Graham Eida

Always good to know we Patreon’s are special 🤣

Graham Eida

Very brave to go for no limit sensors 😳 even with the full feedback 🤔

Stuart Young
>>41432252

Would also check the clearances for some of the pieces around there just to make sure there's no rubbing of that large belt gear, and also possibly ease the tension back a touch.

Josh Perlstein
>>41467589

Agreed, though I suppose he never said definitively that he won't be using some. Always good to have, even if not for a reference point, as a failsafe.

Josh Perlstein
>>41432252

Thinking it's more likely the edge of the belt rubbing rather than high tension. They do make tension meters though, for such timing belts. It may be prudent to have one. Or, just maybe... use gears. (Okay, I just want to see ToT make more gears)

Casey Smith

Regarding the Z axis acme vs ball screw debate, I just have this to say: Anything worth doing is worth doing right!

Josh Perlstein
>>41436744

Okay, so a lead screw is similar to a normal screw and nut except that the thread shape is a bit different to facilitate smooth motion. The screw rotates one way, the nut goes one direction (when prevented from rotating) along the length of the screw. The screw rotates the other way, the nut goes the other direction. A ball screw operates in the same way - with a nut that goes up and down the length of the screw as the screw rotates. The difference here is instead of a one-piece nut moving across [trapezoidal] threads, the nut now contains ball bearings which travel across rounded threads which act like a race for the ball bearings. Ball screws and ball nuts are chosen over their acme/trapezoidal lead screw and nut counterparts for their smooth and quiet operation under high load. The overall accuracy of lead screws versus ball screws merits its own debate; this is, of course, a moot point if you can accurately measure the location of the nut in real time.

Scott
>>41432252

Yep I want to see him make more gears too LOL I'm geared up for it!!

Denny
>>41467589

These servos have a non-volatile memory for stop positions and are enclosed in a way that you would have to take the servo off the machine to exceed them - given there is no other way to move the machine. That being said... as soon as the belt is removed it might be a problem. The definition of software defined limit switches is probably for machines without handwheels, but there are also absolute position encoders that could work with that. Hard to tell which ones are in there.