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Top slide std positioning

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Mike Poole12/03/2018 12:37:24
1309 forum posts
38 photos

I keep mine parallel to the bed as I have no scales on my carriage so it is useful for shoulders and facing cuts. I don't bother to set it any more accurately than the zero mark. I am not averse to moving it for any task that needs it and if it fouls the tailstock.


FMES12/03/2018 15:37:10
445 forum posts
1 photos

Taught by the Royal Navy many years ago, it was always a requirement to leave a machine in a certain state on the completion of training.

The top (compound) slide was always left at 90 degrees to the bed, no reason given - it just was!

Just imagine how untidy it would look if 130 odd lathes were all left in different states.teeth

Can't bring myself to leave it in any other condition today.



Neil Wyatt12/03/2018 15:57:53
13410 forum posts
576 photos
68 articles
Posted by FMES on 12/03/2018 15:37:10:

The top (compound) slide was always left at 90 degrees to the bed, no reason given - it just was!

Probably so no-one would assume it was set parallel when it was actually set to a fine taper.

A good policy when different people use the same machine.


thaiguzzi13/03/2018 16:47:45
376 forum posts
104 photos

So, it's a score draw at half time then....

colin brannigan13/03/2018 17:02:25
34 forum posts
1 photos

Parallel to the bed every time except when machining angles.

Mark Rand13/03/2018 20:41:06
362 forum posts

I run mine parallel to the bed except for turning angles and threading. I suspect that a large factor in preference is how much work it is to change the angle, whether there's a scale on the topslide base and what sort of toolpost is being used. A retractable topslide, like those used in Hardinge lathes, or the G. H. Thomas one, encourages the topslide to be set over for threading because it makes it so easy.

Edited By Mark Rand on 13/03/2018 20:45:16

FMES13/03/2018 21:04:25
445 forum posts
1 photos

I asked one of the ancient and wise today, and apparently its to do with the cutting load being placed on the gibs during longitudinal cuts and not the compound slide screw thread when said compound is at 90 degrees to the bed.

Amazing really that after all these years we just took it for granted, and never bothered asking the question.



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