Brandenberger
Hot Rolled
- Joined
- Sep 19, 2017
Hi,
I'm scraping in my VN22L mill. So far, I've scraped in the column face, and
the ram's flat ways (top of the column) to perpendicular to the column face.
I've scraped the back of the knee to a good level of contact with the column,
and reasonable rough alignment with the column itself.
Now I have the knee back up on the column and the column vertical, to scrape
the top of the knee. The top of the knee excluding the scoring is well aligned
(perpendicular to the column face and parallel to the column top) within
.001" over 18" or better. So all I need to do with the top of the knee is scrape
"straight down".
The knee has bad scoring on the top dovetail, now that I've started scraping it
I've measured it to be about .015 - .020".
I decided to scrape this rather than have it ground, partly because I wanted to
monitor the alignments, minimize excess material removal, and generally cost and
logistics in having someone grind it.
However, I'm now removing say .015" x 24" x 9" of metal. The biax will do the job,
but fairly slowly. I'm tempted to try an angle grinder with a flapper sanding disc,
however I'm hesitant to risk digging a hole that could massively increase the metal
needing to be removed.
I think I'll try the sanding disc lightly in a small spot and measure how deep a "scrape" I
get with the sanding disc?
Then maybe a cross-hatch pattern like with a biax, periodically printing the knee with
the surface plate to monitor overall flatness?
How would you guys do this (aside from sending it out for grinding)?
Thanks,
Phil
I'm scraping in my VN22L mill. So far, I've scraped in the column face, and
the ram's flat ways (top of the column) to perpendicular to the column face.
I've scraped the back of the knee to a good level of contact with the column,
and reasonable rough alignment with the column itself.
Now I have the knee back up on the column and the column vertical, to scrape
the top of the knee. The top of the knee excluding the scoring is well aligned
(perpendicular to the column face and parallel to the column top) within
.001" over 18" or better. So all I need to do with the top of the knee is scrape
"straight down".
The knee has bad scoring on the top dovetail, now that I've started scraping it
I've measured it to be about .015 - .020".
I decided to scrape this rather than have it ground, partly because I wanted to
monitor the alignments, minimize excess material removal, and generally cost and
logistics in having someone grind it.
However, I'm now removing say .015" x 24" x 9" of metal. The biax will do the job,
but fairly slowly. I'm tempted to try an angle grinder with a flapper sanding disc,
however I'm hesitant to risk digging a hole that could massively increase the metal
needing to be removed.
I think I'll try the sanding disc lightly in a small spot and measure how deep a "scrape" I
get with the sanding disc?
Then maybe a cross-hatch pattern like with a biax, periodically printing the knee with
the surface plate to monitor overall flatness?
How would you guys do this (aside from sending it out for grinding)?
Thanks,
Phil