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quadrod
04-17-2010, 08:16 PM
The table on my mill was looking pretty sad. The shop where i got the mill just got an K O lee grinder, 24x48 table and i got to be the Guinea pig. Here is the before, a video of the grinding and an after shot. It is not perfect but a whole lot better than it was.
http://i157.photobucket.com/albums/t78/quadrod426/P6050063.jpg

http://i157.photobucket.com/albums/t78/quadrod426/th_PB040083.jpg (http://s157.photobucket.com/albums/t78/quadrod426/?action=view&current=PB040083.flv)

http://i157.photobucket.com/albums/t78/quadrod426/PB120001.jpg

mark61
04-17-2010, 08:59 PM
That is cirtainly an improvement over the shamefull condition of the table! How much did you have to grind off?

mark61

tdmidget
04-17-2010, 09:06 PM
How did they make sure it was co-planer with the ways?

mark61
04-17-2010, 09:26 PM
Use drill rod in the between the ways and the magnetic clamp.

mark61

quadrod
04-17-2010, 09:44 PM
We tried 1-2-3 blocks under the ways but the mag chuck would not hold the table through the blocks. So we put the table right down on the machined surface below the dove tails. We measured .002" from one corner to the other on one end of the table between the table and the mag chuck, but we also measured over .008" just in the table thickness from front to back on one end. When we started grinding it was very obvious that the table had quite a hump in it. We ground off .015" before the wheel even touched on one corner, took .020" before the wheel touched on all four corners of the table. So the table may not be perfect but as i said it is a whole lot better than before. Running a test indicator in the spindle and running the table from end to end reads .003 to 0 in the middle and .003 on the other end. the table is 42" so i can live with that.
So far the only draw back is now i have to tram the head in again, oh well i guess i need the practice.

Black_Moons
04-17-2010, 11:49 PM
Id wonder about the 'hump' you measured...

If the center was actualy thicker, you might of 'corrected' the bed
but if the center was just bowed up, you might of made the center 'thinner' now.

Put the bed on the mill and use a TDI to measure the vertical distance from the spindle to the suface of the bed and sweep the bed

hardtail
04-18-2010, 12:09 AM
Wow that looks great and the price was right.......sorry condition that someone left it in before........I've heard some cast iron powder mixed w JB weld makes the other divots almost invisible.........