A little help

[functionbikes]

I was wondering i anyone on here can help me out with some questions, for the past3 months i have been building a 3 axis gantry router with a 4x4 work area I have used 25mm linear rails on x and y axises, the problem that I have run into is that I have dialed in the first set and they are out still .010 from being parallel over a 5 foot distance, which is compounded by having to shim a floating semi fixed work area which it seems that what ever i do still has a cup in the center of the work area of about .035.

could someone give me some advice

Jlittle

[functionbikes]

Anyone, Bueller?,Bueller?

[ger21]

Can you bolt one side down, and then let the gantry dictate the spacing between the two. Tighten it down as you move the gantry along the rail?

[functionbikes]

I would do that if I was farther, I am having trouble getting the rails to lay flat in the horizontal plane, I currently have them within .015 over a 5 foot span in both x and y

[ger21]

Check out the method used here. Lots of other good info too.

http://www.oneoceankayaks.com/madvac/madvac_index.htm

[BobF]

Once you get the gantry worked out, surface the table with the machine. That should eliminate your cup.