Search:

Thank you! At least now I know how the REAL spindles are made :)

For my hobby purposes, though, this is overkill. I intend to spend $20-50 on the bearings and use the spindle at speeds under 10000...

Great! This really simplifies the design.

What kind of bearing should I use? Shielded? Sealed?

Also, what kind of belt should I use for the spindle? Vee-belt or maybe belt with teeth?...

Like so?


Can you please explain this?

The proven arrangement being double row angular bearing in the front and deep groove ball in the back? I'll probably do just that, as you can see in my last attachment.

The question is now what is...

I am looking at the double row angular contact bearings, and can't get the following: how they are preloaded axially? In fact, are they supposed to be preloaded axially at all?

In such a setup,...

I think you're right. Now, is that a good thing or a bad thing?


Is grinding done in a lathe? The way I imagine it first the bulk of the material is taken away with a chisel, then the rest is...

Well, I will ask a friend who operates a lathe to do it :)
My understanding is that is with the first pass he will get the outer diameter right. Then he will reference off that, making seats for...

Does adding a spacer (purple) seem like a good idea?

Also, I've found the following on another forum:
A common design error (my Chinese lathe and minimill) place the bearings at opposite ends of...

So, per Dragonfly's advice I am putting in angular contact bearings. And per mactec54's advice the whole assembly is held together with a screw from the back (only hole shown).

I've put a cap on...

Gotta wait till the shank/collet arrive!

Great success! :)

The one that I originally ordered has an M10 threaded hole on its end!

You're right! They haven't shipped it yet so maybe there's still a chance. Thank you!

Darn. I already ordered this one:
ER20 20MM 150MM LONG SHANK COLLET CHUCK CNC MILLING LATHE TOOL & WORKHOLDING F67 | eBay

Doesn't say it has a hole.

Oh, so your shank actually comes with a threaded hole in the center!

Thank you! I'm looking at your design, but I can't understand how it is all held in place. Perhaps you can show a drawing or an exploded view?

It seems that I will not be able to thread the shank,...

That's a great idea! Now, do you think it's possible to machine the shank? Perhaps they make it out of some super-hard stuff?

These bearings you mention... Can you point them out here?
Bearings,...

Hi!

Let's say I have a ER20 collet with shank (shown in green). Let's say I put it into some housing (black) along with two tapered roller bearings (dark and light blue). The lower bearing rides...

Does this look better?

Here's what it looks like with the table. I'll try adding the extra 2 bearings on the z-axis.

Something like this?

I was actually considering to mount the spindle on a dovetail plate so that I could mount it higher or lower if I needed it.

I plan to build the uprights out of 40x80 mm...

Or were you referring to how high the Y-axis is above the table level?

The Z-axis travel turns out to be 246 mm. The thing is, I already have a ballscrew that I intended to use in the Z axis. I could probably make it smaller or get a new one. Do you think it's a good...

Hi!

This is my first machine that I decided to design from scratch. I am planning to build it from chinese parts that are available on ebay and a bunch of other places.

I plan to use the SFU...

Thanks, Paul!

So let's say the weight is not a concern, as the rails are mounted on a stationary gantry. Would it be a good idea to use a 40mm wide strip of steel as a shim? Do you think making...

Hello!

I am relatively new to the t-slot profiles, so once I got a scrap piece in my hands I saw something unexpected:
http://i052.radikal.ru/1208/35/cc142b562c2e.jpg

The parts marked with...

Thank you!

Hi!

This machine is truly a masterpiece. Good job, Don!

I would like to ask some questions about the design, though. I see that the table is mounted on SBR-type rail system. Yet the other axes...