Re: Hot rolled router frame

Hi Roger,

When I looked into what I needed to do here in the Phila area, I
found that stress releving on a large table can be done for as little
as a few hundred dollars. about the same as the cost of steel.

I also thought about grinding the table as in the files section.
(thanks Les) and then putting on a toolpost grinder and then using
the linear rails and a temporary table to final grind the bed for the
rails and then of course the rest of the table. I did want to get it
done in one lifetime though.

just some ideas.

Dave




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vrsculptor
<vrsculptor@h...>" <vrsculptor@h...> wrote:

> I'm still thinking about building a good size router. My 12X48 mill
> is too small for some of the architectural projects I'd like to
> tackle. I've found a firm in Miami (Smith Hamilton) with a large
> blanchard that could grind the frame for a 60" (or larger) router.

I

> was considering a moving table design using bolted 2X6 heavy walled
> hot rolled tubing for the table rails with linear slides. I've

never

> attempted anything precision on this kind of scale and would
> appreciate your input:
>
> 1. Is common hot rolled tubing likely to be straight enough as it
> comes from the manufacturer to use or do I need to order something
> special? Is a 5' or 6' piece likely to be straight withing .020-

.025"?

> 2. With a bolt together frame there are going to have to be some
> weldments and holes added before grinding such as end plates and
> bushings through the 2" width for bolts. Will the tube still be
> straight enough after arc or mig welding to grind?
>
> All input welcome... I prefer to learn from others experience

rather

> than my mistakes.
>
> Roger S