Table floating measurements

1

I decided to measure how much is my A350 machine table floating… i used the grade B
gage block set

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for dose who not sure what is that mean, grade B is excepted all over the world as accurate measurement for most organizations
like automotive, moulding, medical, etc by ISO, QC and such…

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grade A and AA would be used by military, nasa etc… but we don’t build space ships here :joy:
so i measured the left and right side, the front, central and back …

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and that’s the result i got
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to me it is a lot of floating…
but it could be normal…
my question is… it is normal?
I only have imperial gage block set… so… 0.001”=0.0254mm

the reason i start measuring is, because i wanna build a rail system under the carriage
My worries is if put a rail system and it’s forces this floating to go even, it may gets to much for the motor. is it?

I just find the only GD&T reference on line about the A350 carriage…

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the flatness shows 0.15mm (0.0059”) is this for each side? or between top and bottom from centre of carriage? or from front to back?

2

it doesnt sound further off than anyone elses is unfortunately.

Several members have machined replacement bases that are flat, should not be much of a problem afaik.

I personally just went with a glass bed since i havent really toyed with the cnc or laser at this point.

3

  1. cast base is a poor reference for true flat

  2. yes, looks out of tolerance. Frankly your options are
    a) accept it
    b) beg support for replacement, this is the option I went with: the replacement is just as wonky, so I’d recommend against it as a permanent fix except it allows for c) with less risk
    c) machine it flat (less risky when you have a backup)
    d) shim with rails like some others have done

If you’d like to relive me losing my mind:

1 Like
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thx guys… that actually make feel better… now i know that this is the normal of this machines and not only mine is one of the kind… i now gonna design the real system, to improve the floating… and i hope that will fix my tool stalling tooo​:thinking::pray::+1: