Before I go and damage the spindle/spindle bearings

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Hawk
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Before I go and damage the spindle/spindle bearings

Post by Hawk » Sun 02 Aug , 2015 15:33 pm

Hi all. I'm taking the headstock bearings out to check them and clean them if they're ok, if not replace them.
Before i get carried away and ruin some bearings or better yet, the spindle. Is there anything else I need to do to get the spindle out?
I've taken all covers off and lockrings. It looks like the spindle is just sitting there now.
I understand from Dazz' previous posts that i'll need to make some adjustable spacers (bolts with long nuts) to help make sure the gears inside don’t get damaged.
After that's done, do I get my copper headed hammer and tap away at the gearbox side of the spindle, Or is dazz' method with the threaded bar and wooden blocks a better idea?

Thanks!
Attachments
2015-08-02 14.44.22.jpg
Gear side as it is now
2015-08-02 14.44.22.jpg (209.28 KiB) Viewed 5734 times
2015-08-02 14.44.14.jpg
chuck side with no cover
2015-08-02 14.44.14.jpg (185.58 KiB) Viewed 5734 times

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dazz
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Hardware/Software: Viceroy TDS 1/1GB lathe, Imperial, stripped down and rebuilt.
Viceroy Taper/Tracer attachment, Shop made cross slide tracer attachment, VSD.
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Re: Before I go and damage the spindle/spindle bearings

Post by dazz » Sun 03 Jan , 2016 23:22 pm

Hi
In the absence of any other replies, I still think my method is the best option.
If you find a better way, please let everyone know.
Regards

Dazz

davidA
Posts: 3
Joined: Mon 04 Jan , 2016 12:54 pm
Hardware/Software: Viceroy 280 Synchro.

Re: Before I go and damage the spindle/spindle bearings

Post by davidA » Wed 27 Jan , 2016 12:44 pm

Dazz, Hi,

How did you get on with your problem ?

Maybe you can help me here.
How do you adjust the spindle front bearings ?

I believe that they just need a light pre load, but how do you actually make the adjustment ?

David.

davidA
Posts: 3
Joined: Mon 04 Jan , 2016 12:54 pm
Hardware/Software: Viceroy 280 Synchro.

Re: Before I go and damage the spindle/spindle bearings

Post by davidA » Wed 27 Jan , 2016 12:47 pm

Quick reality check,

I may have posted this in the wrong place.
My machine is a 280VS.

David

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dazz
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Posts: 230
Joined: Sat 19 Aug , 2006 11:31 am
Hardware/Software: Viceroy TDS 1/1GB lathe, Imperial, stripped down and rebuilt.
Viceroy Taper/Tracer attachment, Shop made cross slide tracer attachment, VSD.
Location: New Zealand

Re: Before I go and damage the spindle/spindle bearings

Post by dazz » Wed 27 Jan , 2016 13:42 pm

Hi
I actually ended up with quite a lot of pre-load.
On the left hand end of the spindle are two nuts.
These are left hand threaded..
Just tighten the nuts until you get the desired pre-load.
Regards

Dazz

rpwilson
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Re: Before I go and damage the spindle/spindle bearings

Post by rpwilson » Wed 27 Jan , 2016 14:03 pm

If David has a 280VS, the procedure is different, because the adjustment is in a different place! The adjusting nuts on a 280 are under the headstock cover, behind the front main bearing. There are 2 locknuts, which if I remember correctly are left hand thread. You need a couple of big C spanners for this, unless you are prepared to use a punch and hammer for the job. If you can wait until this evening, I'll check what Denford's recommended method was - believe me it wasn't anything sophisticated!. My 280 Synchro chattered badly when I first got it, so I adjusted the bearings, I think the adjusters went up by about 1/8th of a turn, now everything is fine. There were paint blobs on both nuts, in line with each other, so I suspect that this might be how the factory fitters marked things, so its easy to tell if anything works loose. If thats so, mine hadn't been adjusted since it had left the factory 30 years earlier.

Richard

Pete.
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Re: Before I go and damage the spindle/spindle bearings

Post by Pete. » Wed 27 Jan , 2016 21:25 pm

Headstock detail...
280VS Headstock Arrangement.pdf
(113.87 KiB) Downloaded 245 times
The adjustment method is to add preload and measure a rise in temperature at high speed over a set time. Can't remember the details.

EDIT: Found it. Pic attached.
preload.JPG
preload.JPG (67.25 KiB) Viewed 5379 times

rpwilson
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Joined: Tue 03 Jun , 2014 15:20 pm
Hardware/Software: None. I own a pre CNC Denford 280 Synchro lathe.

Re: Before I go and damage the spindle/spindle bearings

Post by rpwilson » Thu 28 Jan , 2016 2:35 am

Its worth noting that the reference to the transducer gear is only applicable to 280s with the electrical speed control. 280s with manual speed control don't have the transducer gear, they have 2 slotted nuts. Thread is still left hand though.

Pete.
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Re: Before I go and damage the spindle/spindle bearings

Post by Pete. » Thu 28 Jan , 2016 7:16 am

Actually, my VS is manual speed control and has the transducer gear fitted. It has no transducer, but the gear is there. I assumed that it was fitted either to maintain spacing or (more likely) so that they could fit up any headstock for manual or electric speed control as orders dictate.

rpwilson
CNC Expert
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Posts: 139
Joined: Tue 03 Jun , 2014 15:20 pm
Hardware/Software: None. I own a pre CNC Denford 280 Synchro lathe.

Re: Before I go and damage the spindle/spindle bearings

Post by rpwilson » Thu 28 Jan , 2016 10:00 am

Oh well, you learn something every day. Mine hasn't got the transducer gear, so I foolishly jumped to the conclusion that all manual control 280s were the same. Wrong again.

Richard

Pete.
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Re: Before I go and damage the spindle/spindle bearings

Post by Pete. » Thu 28 Jan , 2016 18:33 pm

Don't be glum Richard :rain: :)
Could be mine was meant to have speed readout but they changed their mind and it was cheaper to leave the ring in there than spend time pulling the spindle.

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