Re: [CAD_CAM_EDM_DRO] Lead screw compensation

Greg Jackson wrote:

> Does anyone know if CNCpro or other inexpensive parallel port G-code
> interpreters offer compensation to make the rolled thread ball screws work
> as accurately as the ground thread screws?

EMC is the only one I know. This runs under the real time Linux operating
system.

> It has been suggested to me
> that I would need a laser interferometer to do the compensation but, if I'm
> only looking to correct to 0.001", I should think that a center drill
> making holes every 1/2 inch or so could produce a reference plate that I
> could then use with a surface plate and a height gage to create my
> correction table.

You can lay the height gage on its back and read 'height' from a fixed point
to a rod in the spindle. You can also lay a stack of gage blocks on the table
and have a dial test indicator touch the last block. As you move the machine,
you slip in blocks until the DTI reads zero, and then add up the blocks to
get the reading.

Jon