New Machine Build- Bridgeport Series II Interact CNC Backlash

[Malzra]

Hello does anyone know how to tighten up the backlash on a Bridgeport Series II Interact?

The big problem is on the X axis the Y axis I think is still ok.


Thanks in advance

[gus]

Its a ballscrew, you do not adjust it

it is more likely the[end support] bearings. if the screw has backlash you send it out to be reloaded

[Malzra]

I was reading this nice walkthrough somone had made at

http://www.metalworking.com/Dropbox/...&-backlash.pdf

and was really more curious if anyone had ever done tightened up the blacklash on a interact model.


I was wondering if there was any real differances I need to be aware of before I go tearing the bed apart.

[Malzra]

Another day I figure out I need to spend more money and time to play.

Turns out my "Thrust Bearings" on ither end of my saddle are just fine, So only two options left.

Ither my "Ball Nut" in the center under the bed is trashed (Of which I think it is) or my "Ball Screw" is just that bad out and needs refurbishing. Anyways here's the pics thus far on my teardown of the bed.

Oh and by the in case anyone is wondering the bearing replacements for the FAFNIR Ultra Precision bearings that comes with this machine cost $501.80 PER SET!!!!!!!

Oh and another thankyou very much to BP for makeing me have to build a custom "Spanner SOCKET" to take the spanner nuts off

[polaraligned]

I have a BOSS 6 that pretty much looks the same. I had the ballscrews re-balled and I still have .002" backlash. Bearings are also new. I need to dig further to see what is going on.
Let me know what you find.

[Malzra]

Update:

Well I lifted the bed today and it was quite a easy process when you have all the right tools.

I have access to the entire Ball Screw and Ball Nut now and I'm trying to get the Ball Nut off the Screw and there are some black bearings on ither end of the Screw that is preventing me from removeing it. I can't find anything about them from of the manual so anyone have any ideas before I go hacking at it?

Pictures as always

[dreammstr6]

most of the time if you remove the ballnut from the ballscrew it not pretty and is costly. but yours may be different i would ask someone who knew before i risked it.

[Malzra]

I've heard the same from a few people, Saying when you pull them out the ballbearings fall out and makes a huge mess.

So my thoughts are If I remove the ballscrew with the ballnut attached and send it out to winter engineering and see what can be done with it

I've heard good things and good prices out of thier shop.

Next up! Saddle removal to get to the Y axis to see why the hell is it "Sticking"

[dreammstr6]

that sounds like a good plan. when i took my ez-trak's apart to move them in i did the same. took the screws off complete with nuts installed. y axis you have to be really careful with on a ez-trak. nothing stops you from screwing the ballnut off the back side of the screw which is a major no no. maybe you will get your mill straightened out for a reasonable price.

[polaraligned]

If you remove the ballnut, you will be sorry.
Just send the assembly out to be re-balled. Hopefully it is not too late. You probably want to replace the angular contact ballscrew bearings. Not cheap.
I had mine re-balled and replaced the bearings and have zero backlash now

[Malzra]

Fair enough if you just had yours redone where did you sent it and about how much was it if you don't mind me asking?

Edit: when you say angular contact ballscrew bearings? you mean the ballnut itself that the bed attaches to or the bearing on ither end of the table?

[ichudov]

I have a question, how exactly do you guys know that you have backlash?

How do you establish that, as a fact?

i