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All squared away.

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philf:

--- Quote from: DavidA on March 14, 2015, 04:36:00 PM ---
I know how I would do it.


--- End quote ---

Dave,

Are you brave enough to tell us yet?

Cheers.

Phil.

Fergus OMore:
Actually, you can do it with a child's lazer pen- hence my Moonbeams

Norman

AdeV:

--- Quote from: Fergus OMore on March 16, 2015, 12:36:56 PM ---Actually, you can do it with a child's lazer pen- hence my Moonbeams

--- End quote ---

First, catch your child....

DavidA:
What I did is fit my faceplate then take a very light skip across to the centre.

(That's why I excluded the use of a faceplate in the hypothetical case above)

I then placed a straight edge right cross the plate.
Only if the headstock was square  to the bed would there be no gaps at any point.

If the chuck end of the headstock was toward me then I would get a concave cone,  if it was away from me I'd get convex cone.

Of course, this won't do much good it your chuck back plate isn't square. So I suppose if you treated that the same way then everything should fall into place.

Then you can put a bar in the chuck and do the tests mentioned above.

The truth of the back plate and how well it fits the register and the thread seems to be critical to all this.

Dave.

vtsteam:
Assuming the saddle slide is square to the ways.

All these problems can come up in building a new lathe.

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