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3d indicator design

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BillTodd:

--- Quote ---But do you anticipate any use for it in the Z axis, apart from levelling the top surface of a workpiece, or tramming a milling vice?
--- End quote ---

That's a good point  Andy . One quick fix for the wobbly vertical slide would be to remove it - i.e. fix the probe in to the XY-plane slide and just use it as a 2D probe  :thumbup:

BillTodd:

--- Quote ---Seems to work very well
--- End quote ---

Thanks Dave - it is, but just not quite well enough. For it to measure accurately, it has to move smoothly - it does not at the moment :( 

PekkaNF:
I'm not compentent on this issue, but my first advice is not to give up. Often when all looks lost, answer is just around corner. Has happend to me many times. On some aplications I see that there is an accurate hard surface as a reference and then a member is pushed against it. Really hard to get many close fitting parts work together.

Pekka

BillTodd:

--- Quote ---my first advice is not to give up
--- End quote ---

Thanks for the encouragement  :mmr:

Adding a threaded lock nut has fixed the zeroing problem and makes the whole thing feel better :) (although I won't be using a 40tpi thread on the next one - way too fine and far too easy to cross-thread !)

Thinking about it some more; The play in the vertical slide only messes up the initial zero measurement  i.e. the rest position will not be exactly 2mm from the centre of a 4mm probe. However, as long as the play is consistent in all directions (which it should be), the edge position should be reliable.

Next , I'll make a short 4mm diameter probe  and test it.

BillTodd:
Ok, a little more progress...

I've replaced the ballslide's  brass tube and washer design with a steel 'top-hat' & nut that runs directly on the balls.

The fit between the new brass bottom taper part and the ball-slide tube is now ten times better, and enlarged the top of the taper is less inclined to tip. All this has increased my confidence that this thing might work :)

I just have to tweak the depth of the shoulder in the body to suit the new parts and it should be ready to test properly  :thumbup:

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