[Azalin]

Thanks hanermo.

I just started to drill. I think this will take some time.

[Azalin]

I'm not planning to cut a labyrinth seal for the back (upper) side. However I'll cut a cover which has .01-.02mm gap to the shaft. Also the 80mm dia pulley will be very close to the cover, maybe the same gap which is .02mm. So the pulley and the cover will act as a labyrinth together. What do you think?

[G59]

I'm not planning to cut a labyrinth seal for the back (upper) side. However I'll cut a cover which has .01-.02mm gap to the shaft. Also the 80mm dia pulley will be very close to the cover, maybe the same gap which is .02mm. So the pulley and the cover will act as a labyrinth together. What do you think?

If the pulley is that close it will act as a slinger when running. When stopped then don't immerse it in coolant.

Did you finish boring?

[Azalin]

Yes and it's better than a labyrinth I guess.

If the pulley is that close it will act as a slinger when running.

I have strong migraine attacks these days as the weather is very unstable so not much progress.

[G59]

I have strong migraine attacks these days

Not fun. Hope you feel better soon.
I enjoy following this build. It reminds me of the way I used to build them.

Slowly but surely you'll get there.

[Azalin]

Thank you.

[Azalin]

The exterior of the body is almost ready. I left .1mm material for grinding. Now I can bore the inside.

Is it recommended grinding the bearing houses on the body or just cutting to the right dia is OK? If grinding is needed I'll have to make a hole grinder.

Sent from my GT-I9300 using Tapatalk

[G59]

Why grinding of the exterior? That's estetics only. The bearing surfaces benefit the most from grinding. But, it doesn't have to be. Just keep your tolerances in check and check for "roundness" of the bearing surfaces.

Nice job.

[Azalin]

Cool. Because grinding on lathe is a real mess.

[RotarySMP]

You got a nice finish on that.
Mark

[Azalin]

Thanks Mark. Yesterday I started to bore the inside. It wont take long to complete the interior.

Next thing is to drill the holes on the outer labyrinth seal. I'll do this on my CNC.

[Azalin]

Still working on it. Small lathe small passes.

[Azalin]

I was about to cut the inside for the bearings but to get the best squareness I checked the housing with my dial indicator. It seems like the chuck isn't that precise. I used a piece of 0.05mm SS sheet between the jaw and the workpiece. It solved the problem perfectly.

https://youtu.be/Q6TXCyBnkmQ

[pippin88]

Are you unchucking and rechucking the workpiece in a 3 jaw? That will never be accurate. You need a 4 jaw (independent jaws, not self centering).

[Azalin]

It's a 4 jaw chuck but self centering.

Everything went well until now. Next is to drill the holes in the labyrinth outer part. I'll do this with my CNC.


It comes together:

[G59]

Looking good. You ground the OD I can see. If not then, nice finish. Carbide or HSS for finish?

[Azalin]

Thanks. The OD isn't ground. Just turned with carbide indexable. There is a .1mm material left on the OD for grinding. I'll do that when everything else is done.

The gears on my lathe is set to 0.01mm per revolution. That give me a nice finish.

[Azalin]

By the way, I got some 6xxx series bearings. I'll do all my tests fittings etc with them. That way my angular contact bearings remain new and clean. : )

[pippin88]

By the way, I got some 6xxx series bearings. I'll do all my tests fittings etc with them. That way my angular contact bearings remain new and clean. : )

Are the bearing specs (precision / fit class) the same? You may adjust fit for the 6xxx and find it is not right for your AC bearings.

[mark.colford]

Nice work on the spindle! I used to have a Bridgeport R2E4 CNC and it had a NTMB30 spindle. I still have end mill holders and collet holders as well as bench block for tool changing and TOL micrometer stand with micrometer. If interested I will sell for a reasonable offer. I can supply photos if you request.