Re: [CAD_CAM_EDM_DRO] final finishing of steel bed

Surf it for flatness. "Seeing" these marks is irrelevant. They way to surf it is first obviously with a surf gage which few people have although, one can be made with a block with one ground flat surface and attach an interapid or other dial indicator along its side. Then just move it around the block and it will show variances is surfaces. Or put the plate on a surface plate and attach a dial indicator on your height gage and surf it that way. A fine grit boatstone or diestone with oil will work out all the maching marks. Will make a good flat surface for a router. Tram the mill head in with an indicator and resurface if there are lips that you can feel. Use new inserts in the cutter or keenly sharpened cobalt or at least high speed steel to cut down on deflection. If a fly-cutter is used dont swing it to wide.

Ron

Graham Stabler <eexgs@...> wrote:


I have just finished doing the final pass of my egg-box style steel
bed plate. It is 730mm X 730mm in size and I have finished it with
a shell mill with carbide inserts (only two inserted so it acts like
a fly cutter). If the overlap between the passes is small a very
slight lip is seen, this I think is due to the head of the mill not
being spot on vertical. To avoid this I have made the step over
half the diameter of the shell mill. However the fact it is carbide
means that it doesn't really like taking off tiny amounts. I have
ended up with a flat bed but the machining marks are unusual to say
the least, you cannot feel them but you can see patches near the
overlaps.

I would like to polish out the machining marks on the bed either
manually or using the big mill it is still mounted to. I don't want
to mess up the flatness so I am looking for ideas of what to do.
Could I for example just use a largeish fine oil stone?

I should mention the bed is for my router so it is on topic I hope.

Cheers,

Graham





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