Centec 2b y axis

This topic has 13 replies, 7 voices, and was last updated 10 March 2021 at 01:47 by Mark Williams 14.

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2 March 2021 at 17:24 #531257
jason evans
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@jasonevans10206
Hi guys

sorry got another question. Has anyone got pics of the Y axis lead screw setup on a centec mill.

would like to see my options for changing to ball screw before I start tearing it down.

thanks

jay
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2 March 2021 at 17:24 #14188
jason evans
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@jasonevans10206
2 March 2021 at 17:31 #531259
duncan webster 1
Participant
@duncanwebster1
The screw is very close to the underside of the table, I doubt you would get a ball screw nut in. The bronze nut isn't a full nut even. I'm happy to be proved wrong
2 March 2021 at 19:21 #531275
Dave Halford
Participant
@davehalford22513
Its in full view under the table on the righthand side and only held on by the big nut.
2 March 2021 at 23:23 #531316
not done it yet
Participant
@notdoneityet
My y axis nut is dead central and hidden from view.
3 March 2021 at 00:30 #531322
duncan webster 1
Participant
@duncanwebster1
Posted by duncan webster on 02/03/2021 17:31:14:

The screw is very close to the underside of the table, I doubt you would get a ball screw nut in. The bronze nut isn't a full nut even. I'm happy to be proved wrong

Doh! I was referring to the x axis nut, never seen the y
3 March 2021 at 07:50 #531346
Gary Wooding
Participant
@garywooding25363
I've never taken it out, but here's a photo of my Y-axis leadscrew nut. The clearance round the nut seems promising.
3 March 2021 at 12:50 #531414
jason evans
Participant
@jasonevans10206
cheers. there does seem a bit of room in there. is the brass nut just a push fit in the hole it locates in. cant imagine it is rigid.
3 March 2021 at 13:11 #531418
Gary Wooding
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@garywooding25363
Posted by jason evans on 03/03/2021 12:50:17:

cheers. there does seem a bit of room in there. is the brass nut just a push fit in the hole it locates in. cant imagine it is rigid.

I really don't know.
3 March 2021 at 15:49 #531460
T.B
Participant
@t-b-2
I ended up making a new screw and nut for the Y axis when I refurbished my Centec 2B.

I was too tight to make the whole nut from bronze so pressed a piece into a steel body.

From memory the original nut was a light press fit in the knee casting

Edited By T.B on 03/03/2021 15:51:10

Edited By T.B on 03/03/2021 15:53:08

Edited By T.B on 03/03/2021 17:17:30
3 March 2021 at 17:23 #531477
jason evans
Participant
@jasonevans10206
Excellent thanks for the pics. Just what I needed 👍🏻
6 March 2021 at 09:49 #532044
Mark Williams 14
Participant
@markwilliams14
I have fitted ballscrews to my Centec 2b ,x and y axis. No problem, tight squeeze on the y though.

regards

Mark
9 March 2021 at 23:34 #532873
duncan webster 1
Participant
@duncanwebster1
Mark, do you have any photos or other details? Not something I'm planning in in the near future, but if I ever do it copying yours would be a good start.
10 March 2021 at 01:47 #532881
Mark Williams 14
Participant
@markwilliams14
Duncan,

I am away from home for possibly another two months, so I can take pics then when I get back. From memory I joined a ballscrew to a stub shaft to replicate the original screw and made an adaptor for the ball nut to screw onto that fitted into the casting like the original nut did, I also added needle bearing thrust washers to the stub shaft. I had to space out the mounting flange casting from the y casting by 10mm to get it all to fit. I have a feeling I lost a small amount of y travel but not much. My ballscrew nut had a threaded end on it not a flange type like most seem to be so I think that made it easier.

regards

Mark
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