Milling machine - video

[tonyfoale]

I built similar working power feed for Z axis and I faced a problem which made me stuck.

Lead screw nut (made from bronze) when knee going down starts vibrating a lot. Very loud, whole machine starts shaking. I tried everything even welding in again flange for nut to remove any missaligment but nothing helped.

It worked well only two days...

Lead screw don't run dry, it's oiled.

Do you have any ideas what else I could try to remove those vibration?

IIRC you have linear ball slides on the Z axis, that is very low friction. I am guessing but I do not believe this is a good match to a normal lead screw. Maybe you need a ball screw. Like I said this is a guess, but the forces provided by the slide friction from normal dovetails will relieve load off the lead screw and nut on the way down.

I am currently building a CNC surface grinder which with a change of grinding head to a milling spindle will also be a 3 axes mill. I am using linear rails and ball screws on each axis. However as it is a work in progress it is too early to come to any conclusions about vibration. I have my fingers crossed.

Here is an idea. On my Bridgeport mill I have added 4 assist springs to the knee to relieve load off the stock screw and nut. Here is post that I made A knee helper
maybe something like that would work for you???????

[SteelCraft]

Problem solved

Resonance was caused by slightly too loose chain between motor and clutch. I put more tension and all weird symptoms are gone.

[mwmkravchenko]

Problem solved

Resonance was caused by slightly too loose chain between motor and clutch. I put more tension and all weird symptoms are gone.

So this is loose chain on your power feed?

And yes a resonance can do this. The other thing that may allow it is incorrect lubricant. Perhaps a light wheel bearing grease on the screw and nut?

Mark

[SteelCraft]

. Perhaps a light wheel bearing grease on the screw and nut?

Mark

I use LAN-46 machine oil, meant for gearboxes, hydraulics and slide guide ways.

[SteelCraft]

New Video:

Part 19 Building power feed for all axis:

[SteelCraft]

Hello

I added flood coolant to my DIY milling machine. It's build to be easily replaceable.

[DIYer]

Thanks SteelCraft! We've added your Flood Coolant System to our Machining category,
as well as to your builder page: SteelCraft's Homemade Tools. Your receipt:

Flood Coolant System by SteelCraft

tags: coolant

[SteelCraft]

Hello!

I finally managed to finish build of new improved head for my milling machine. Let's say it's third version but second one existed only as 3d model.
Quill, motor, pulleys, fine feed worm gearbox are from old head. Still needs some tweaks before recording test and publishing built video.







Hopefully I will change current mt3 spindle shaft to custom made iso30 taper spindle shaft and then install power drawbar.

[tonyfoale]

Hello!

I finally managed to finish build of new improved head for my milling machine. Let's say it's third version but second one existed only as 3d model.
Quill, motor, pulleys, fine feed worm gearbox are from old head. Still needs some tweaks before recording test and publishing built video.


Hopefully I will change current mt3 spindle shaft to custom made iso30 taper spindle shaft and then install power drawbar.

The spindle change is a good move. I always wondered why you didn't pick R8 or iso30 instead of MT3.
There is a contributor on this forum "ThreadExpress" who did a very interesting comparison of R8 and iso30. He may have included a MT3 but I do not remember exactly.

[SteelCraft]

I always wondered why you didn't pick R8 or iso30 instead of MT3.

MT3 spindle was dirt cheap on aliexpress, literally 50 USD. Back then I didn't know if whole machine will even work as mill and plan B was fancy drill press - that's all.