ball screw question

[sml2010]

Hi to all


Can some one help me and tell me: In the ballscrew with 25 mm diameter, which kind of bearing(fix or support bearing) and how bearing install in the end ballscrew shaft?



Fix bearing ?



Support bearing ?


Can you please tell me about install of bearing in end shaft?



Thank you

[79TigerPilot]

Since there have been no replys I will give it a try. Looks like the left end of the shaft is setup for a pair of anglual contact bearings at locatin "C". It looks like a collar/spacer goes on next followed by a nut with an M20x1 thread. The nut is tightened on the spacer which clamps the bearing inner race to the setp on the lead screw. The right end looks like it's set up for a plain bearing as the journal is much shorter. It also has a spacer then a nut but I would bet the bearing if semi floating in the bearing block to allow for thermal expansion.

This is exactly how my Bridgeport is setup.

Craig

[sml2010]

So i must use Fix bearing in both side?

Yes?

[RICHARD ZASTROW]

The bearing on the right end is designed to "Float" or move within the end support housing. As Craig said, this allows the bearing to move axially if the ball screw grows due to thermal (heat) expansion while preventing radial motion (whip).

Dick Z

[79TigerPilot]

Just to be clear, the angular contact bearing set on the left constrains all the axial load in both direcitons the right side bearing floats in the holder and just constrains the radial load of the ball screw.

Craig

So i must use Fix bearing in both side?

Yes?

[sml2010]

hi to all

Thank you for your answer.

I understand that we must use float bearing on the right side but my question and my confuse is for instal float bearing in this location, because :

this location have a thread in the right side like thread that is in the left side . I all bearing that have nut and spacer, Doesn't have movement throw the holder.
And if i use float bearing, the float bearing doesn't have nut and spacer for fasten and locate the bearing in the shaft

can you please tell show me a bearing with nut and spacer that can float throw the holder?

sorry if i don't understand your teach and ask again

Thank you

[RICHARD ZASTROW]

The nut on the right end holds the bearing in place on the shaft. The outer race of that bearing is not held in place axially within the bearing support block. The support block has room that allows that bearing to move axially, it "floats" axially.

Dick Z

[sml2010]

Thank you for your kindness