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Magnetic Indicator Holder

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vtsteam:
Pekka are you sure the ways are worn? A varying thickness of the milling table will have the taper cutting effect. It seems like the distance between an end mill and the ways at the point of contact with work would not change as the table traverses, even though ways were worn to an incline. But it would change if the table thickness varied.

If the ways are off, shimming the column -- traming --  can bring the head into alignment with the ways. If the table upper surface itself is the culprit (which it sounds like), You could mill it with a big enough single tooth carbide fly cutter (I made a big one to mill my tractor head).

Maybe I'm not understanding your problem correctly, and apologies if I've got it all wrong here.

vtsteam:
Thinking about it further there's a point of confusion for me -- I thought you were talking about the ways, but i think you mean correcting the table slides. I think of the ways as the base portion.

You want to remove the table and use the upper table surface as a standard by putting it on a surface plate, and bring the table slides into alignment with that. That is another method of creating a constant thickness for the table, besides trueing up the table top surface with a fly cutter in the mill itself.

Which is preferable is up to you. If the table slides are not linearly worn, then fly cutting the top surface will add curvature there, so doing the slides would be better.

If the variation is linear or close enough, and relatively small over the length, then you could true up the top, if you wanted.

NeoTech:
Making a one hand indicator stand should not be that hard ?? Its just two rods with a 45 degeree in the ends and block that forces them outwards when its screwed tight. Harden the 45 deg. surfces and use a volfram ball or similar for wedge.

PekkaNF:
VT. the ways/slides are worn on the middle. I verified this with repeated measurements parallels/clocks and loaded/unloaded. Gibs loose and gibs tigtened.

Only table has dovetails tightening them will pull table middle down a little....looks like table is worn only it's mating surface.

The table is nicely formed rectangular cuboid (sans projecting dovetail) and luckily top is fairly flat. In priciple it should measure same on every corner and then ways should be parallel and in the same plane. But this needs verifying, double check and then corrections have to be applied.

I'm going to try build simple fine adjustment on indicator holder. Actually I tried last one last night and I'm not happy with the original construction.

Pekka

vtsteam:
Pekka, well yes if the slides and ways are worn curved, then there's nothing for it but to scrape them to a reference.

How will you scrape the ways without a straightedge? A surface plate isn't practical here. Well, I guess you mentioned you do have a shorter straightedge....is it the length of the ways?

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