Lathe headstock bearing access

Lathe headstock bearing access

This topic has 3 replies, 3 voices, and was last updated 6 October 2024 at 14:36 by Dave Halford.

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6 October 2024 at 10:34 #757597
Mike Hurley
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@mikehurley60381
I need access to a bearing in the headstock of my old BV-20 lathe. The ends of all he gear trains are covered by a ‘plug’ which I need to remove. Each has a small (5mm) tapped hole in the centre.

I assumed this thread woud allow me to either a) fit a screw and use it to ‘jack’ the plug off or (b fit a lashed-up extractor to pull it off. Neither method has been successful. The threadsize is so small I don’t dare put to much force on it as it’s so light it may just shear off (have tried until I literally couldn’t turn the allen key any more.)

So, anybody seen / done this before? It seems overkill to start drilling holes / applying excessive force at this stage. Any suggestions appreciated

Mike
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6 October 2024 at 11:01 #757600
mgnbuk
Participant
@mgnbuk
That style of plug was usually removed with a slide hammer when I used to work with such things. All the fitters had some form of slide hammer in their toolboxes – usually “home made” and with interchangeable threaded ends to suit different applications.

Nigel B.
6 October 2024 at 12:00 #757620
Mike Hurley
Participant
@mikehurley60381
Many thanks Nigel, hadn’t thought of that one. I’ll lash something up when I have chance and give it a go.

Regards Mike
6 October 2024 at 14:36 #757626
Dave Halford
Participant
@davehalford22513
The same plugs are used on the 2a/b Centec’s, which probably explains why most of them have thread damage to the bolt hole if they had slide hammers used on them.

I used a 2 ” long slab of 6mm steel drilled for the plug hole and another 2 holes tapped m8 which bear either side of the cap. Fully tighten the m5 till it bottoms and then tighten m8 bolts alternately to jack the plug out.

You may find the bearings need to be tapped out with a drift as well unless there are C clips.
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