Brandenberger
Hot Rolled
- Joined
- Sep 19, 2017
Hi,
I’m (still) working on a VN22LU universal mill.
I had about .007” wear on the saddle ways mating the table,
Mostly as you would expect at the ends and less in the center.
There is also about .0015” wear on the flat undersides of the table.
I judged the overall wear on the saddle based on a small patch of
Scraping that was still visible.
I milled and then have scraped the saddle to .0005” or so.
My question is:
In the connelly book, they discuss the importance of maintaining
Alignment of the universal table pivot and the center t-slot. Indeed
Taking .007” off the saddle will move the center t-slot rearward by
By a few thou.
I could build up the saddle again, but with turcite I would want enough
Thickness for oil grooves cut in but not through it, so that would mean a lot more Metal removal.
A very reasonable question being “will I ever need to cut helical
Features which require t-slot centering?”
Maybe or maybe not, hard to say. I will also need to scrape the knee
But can build up the mating surface to offset. So I think the
T-slot center error would only come from saddle wear.
Picture of saddle prior to cleaning and scraping.
I’m (still) working on a VN22LU universal mill.
I had about .007” wear on the saddle ways mating the table,
Mostly as you would expect at the ends and less in the center.
There is also about .0015” wear on the flat undersides of the table.
I judged the overall wear on the saddle based on a small patch of
Scraping that was still visible.
I milled and then have scraped the saddle to .0005” or so.
My question is:
In the connelly book, they discuss the importance of maintaining
Alignment of the universal table pivot and the center t-slot. Indeed
Taking .007” off the saddle will move the center t-slot rearward by
By a few thou.
I could build up the saddle again, but with turcite I would want enough
Thickness for oil grooves cut in but not through it, so that would mean a lot more Metal removal.
A very reasonable question being “will I ever need to cut helical
Features which require t-slot centering?”
Maybe or maybe not, hard to say. I will also need to scrape the knee
But can build up the mating surface to offset. So I think the
T-slot center error would only come from saddle wear.
Picture of saddle prior to cleaning and scraping.