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I usually leave between 0.002" and 0.004" (yes thou). I'd experiment a bit because it really depends on a few factors (type of tooling, grade of aluminum, table flatness etc.) but that should be a...

Wait a minute.. Maybe I missed this in your video, but is the driven end of that ballscrew unsupported??? It looks as if you've got the end just connected to the stepper via a coupler. Any sort of...

Yup! These are 4 row bearings so they can be used in any orientation (4 rows, all opposing each other). It's actually done quite often on z axis, but I'm on mobile and can't pull up any examples....

Evening gents,

I've got some THK HSR15's that I'm using for a build.. Only trouble is they're 0 preload blocks. I'm looking to repack the blocks with larger balls but can't figure out a good way...

https://docs.google.com/spreadsheets/d/1hE_d21qDdjVfYfrjV38PR97wZr-ND2jJ0cEJWxTC8u4/edit#gid=0

Hey guys, just found this super neat spread sheet of all the marker spaces in Toronto! These are all...

Ha! You wouldn't happen to be talking about a certain ad up in Guelph Ontario, would you?

In short yes... You'd typically like to see light to medium preloads for routers.. But if you intend to machine aluminum I'd recommend a medium preload (see...

This guy built a cnc lathe/grinder accurate to 1um...

https://www.youtube.com/watch?v=sFrVdoOhu1Q

This guys put together a pretty "straightforward" looking balancer.. I think it's more an issue of the software and actual measurement equipment used. He's also using it to balance rotors (for a 4th...

I'm literally drooling at those pictures haha. Glad to see you've got some quality components at your disposal.

One thing I might add though.. Not sure you much thought you've put into cable...

Looks like a really interesting build. Any reasoning behind the hollow core in the column? It looks like one complex mold to build, you'd have to cast the entire column from top to bottom to maintain...

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Ahh yes Tobias Merten.. He's got some videos on the tube. Really impressive machine, actually quite a similar design.

https://www.youtube.com/watch?v=fDiEi2bOXgs

Looking awesome by...

I can think of two options off the top of my head. Either some sort of geared reduction ie. Harmonic drive (zero backlash, very high reduction possible, but expensive) or a timing belt setup...

Check this out: https://www.youtube.com/watch?v=KOew0RzdaYE

The design is pretty straight forward. Plus you can use the probe for digitizing objects as well. I've heard of people getting...

Why not scrap the idea entirely and use a cheaper method of power transmission? A simple belt driven axis will work perfectly for a laser driven machine (as there are no "cutting" forces, and a low...

I agree with Ian. If you're able to, threadmiling is the way to go. Now I bet some guys are gonna cringe, *buuut* I've had good results with a handheld drill. Just set it to its lowest speed and go...

It's called "tramming" if you want to look it up

Not to mention that decoupling the motor form the frame could introduce backlash as the motor can "twist" slightly under load

You should check out Dbsharp's build (http://www.cnczone.com/forums/cnc-wood-router-project-log/159262-dbsharps-aluminum-cnc-4.html). He also decided to go an aluminum frame and the result is one...

Nice, glad that worked out. I sometimes wish I could find a set of those thk roller bearings on fleabay. They have rollers which provide a much larger contact area and according to the site provide...

Are the balls caged or contained in the block? The previous owner could have puuled the bearing off the rail and lost a few balls. It's a bit tricky to add more balls (some manufacturers afternate...

It could be a number of things.. If you are sure it's nothing related to the drive mechanism I would check for faulty wiring between the stepper and the drive. Sometimes a loose connection can cause...

Hey Louie, how's the build coming along?

Thank you so much for clearing that up for me James. Certainly answered a lot of my questions. I have dove a little more into slight modifications of the TB6560 driver and I've decided to give some...

happy new year to all!!!!!

I have recently purchased a 3 axis driver (the generic cheap ebay one) and I am quite happy with it so far (almost a year still running, $78 bucks, can't go wrong). I...

I purchased the mentioned 3 axis driver and I am quite happy with it so far (almost a year still running, $78 bucks, can't go wrong). I have been using 78oz-in NEMA 17 motors on my pcb machine, but...

hoping this thread isn't too dead but I have a few questions of my own...(sounds a bit like a nursery rhyme :))

I purchased the mentioned 3 axis driver and I am quite happy with it so far (almost...

quick question...

I have recently acquired 3 stepper motors from a local surplus store. They are 4 phase unipolar steppers rated at 12v and 120ma per phase... I am planing on purchasing bigger...