Re: [CAD_CAM_EDM_DRO] Re: final finishing of steel bed

>

interapid ? Isn't that a brand name like the Starrett LAST WORD ? I
think the generic name is test indicator....

///We usually refer to the push-rod type indicators as "dial indicators" and the swing probe type as "interapids". The latter being much more commonly used. They are more stable and can read at virtually any angle. Its a term everyone understands for that type of indicator. Maybe it's a local thing?////

The machine lines are just that. the cutter has to be a little
deeper in one area than another so will cut a radius.

Also, when it does not cut, it will push or burnish the metal, also
making a mark.

You are exactly correct that carbide is better utilized with a deep
cut and not a small dusting. They do make cobalt and HSS inserts
for most of the most common sizes so, that might be one solution.

you could use some jewelers rouge or some grit and a flat block to
lightly skim the surface. the higher side will be indicated by that
ridge grinding off leaving that polished look.

On one hand some would warn against hand lapping, but if you
considder that your tooling marks are deeper and a light grit and few
strokes will not effect the surface to any measurable degree, it is a
valid test for ridges.

///Stoning/lapping is very common and an excellent way to achieve and maintain flat surfaces. All machinists stone their tables occasionally when needed to remove build-up and the occasional nick from accidently dropped items on the table. The secret is a fine diestone and slow definite circles with the stone, taking care to never let it rock over any edges. Never move it in a straight line and stone the whole surface equally. It's part of the QS-9000 procedure for machine set-up and maintanence. This method would be ample for a router table. When a vise is pulled from a table after a long period and using water soluble coolant. lapping is required. One trick I discovered to almost prevent this is either a liberal coat of paste wax or white lithium grease between the surfaces. It doesnt totally eliminate it however it does reduce the clean up required.

////

A warning about lapping, if you take two equal sized plates and slide
them over each other with grit, the centers will see every part of
every stroke and the edges that hang over will only see half of every
stroke. This results in the center being worn/polished more than the
edges.

But, the question is about the need for ultimate flatness. If you
have the gantry, you can put on your dial indicator on it and run it
around the table to see how perpendicular they are.

And, taking a note from the making of the Hubble Lense, you can map
your table, put in a small 'thing' and grit and lap the table with
your software, in only the high places.

As I understand, the Hubble mirror was flat with a Capitol F.

In scale, it was flatter than the thickness of a dime as compared to
the Gulf of Mexico.

Dave








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