Draw an "X" Across the Surface Plate.
Using the Height Gage and Gage Block measure the difference (Readings) and
record. At a starting point on the Surface Plate (Use the left Front Corner
as a Ref) Take a reading at every 6".
along the X you have generated on paper .
Your margin of error will give you the wear points
on the plate. To get the greatest margin of error use a rectangle block.
It has the least surface area. Square blocks are larger and may miss a
deviation. You could also use a steel ball. This would be a bit more
difficult but would find the greatest wear on the surface of the plate.
This is accurate as far as measurement goes, not necessarily for a surface
plate.
With your size plate it should take no more than an hour TOPS to calibrate.
If you do it every 24 - 36 months - depending on use you may be much more
ahead of the game. What I have given you is a gross error method only, and
problem a lot cheaper.
Regards,
Randy Bock Sr.
Bryce
[log in to unmask]
203 729-5370 Ext 239
----- Original Message -----
From: "Franklin D Asbell" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, January 30, 2003 3:22 PM
Subject: Re: [TN] Calibration/Verification of granite-surface block
> Height gage??? I've got a hieght gage, and blocks...how are those
applied...
>
>
> ----- Original Message -----
> From: "Randy Bock Sr." <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, January 30, 2003 1:51 PM
> Subject: Re: [TN] Calibration/Verification of granite-surface block
>
>
> > A height check with a .0001 indicator and a rectangle gage block.
> >
> >
> >
> > ----- Original Message -----
> > From: "Franklin D Asbell" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Thursday, January 30, 2003 2:18 PM
> > Subject: Re: [TN] Calibration/Verification of granite-surface block
> >
> >
> > > We'll be using this one for the same purpose, do you calibrate
in-house?
> > If
> > > so, what do you use to verify it...thanks...
> > >
> > > Franklin
> > >
> > >
> > > ----- Original Message -----
> > > From: "Mark Hargreaves" <[log in to unmask]>
> > > To: <[log in to unmask]>
> > > Sent: Thursday, January 30, 2003 10:31 AM
> > > Subject: Re: [TN] Calibration/Verification of granite-surface block
> > >
> > >
> > > > Hi Franklin,
> > > > Our granite surface plate is used strictly for warp & twist
> measurement
> > of
> > > > pcb's (very light use). It's on our recall list. The calibration
is
> > > rather
> > > > expensive. I was able to move from yearly cal to 3 year cal by
> > > downgrading
> > > > the plate from "A" (inspection grade) to "B" (shop grade, I believe)
> > which
> > > > is still well within our accuracy requirements.
> > > >
> > > > Regards,
> > > > Mark Hargreaves
> > > >
> > > > -----Original Message-----
> > > > From: Franklin D Asbell [SMTP:[log in to unmask]]
> > > > Sent: Thursday, January 30, 2003 10:57 AM
> > > > To: [log in to unmask]
> > > > Subject: [TN] Calibration/Verification of
> granite-surface
> > > > block
> > > >
> > > > Can anyone describe to me the method of
calibrating/verifying
> a
> > > > surface
> > > > block???
> > > >
> > > > Also, in regards to calibration recall, would this need to
be
> on
> > a
> > > > recall
> > > > list or would it be verify it once in it's lifetime, what
> would
> > be
> > > a
> > > > cause
> > > > of initial calibration being voided...
> > > >
> > > > Thanks,
> > > >
> > > > Franklin D Asbell
> > > >
> > > >
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