> As soon as you need to compensate something isn't right ;-)
What is the lead accuracy of the best ball screw you can find? What is
the typical diameter of a homebrew PCB pad? What is the hole diameter
in that typical pad? Truth is, you won't even have to compensate for 10
thou backlash unless aesthetically dead center means a lot to you.
> 10mil in a foam cutter is probably below what you consider too much.
I'm willing to bet the farm (if I had one) that more than 50% of all
industrial CNC setups have backlash > 10 thou. Either because greater
accuracy was never required or due to lack of maintenance. Whatever,
provided the end product isn't being impacted, nobody cares. Search
Google on >milling backlash thou< to get a better feel of what is
tolerated in milling circles where backlash is most important.
--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
> On Wed, 29 Jun 2005 17:36:34 +0200, derekhawkins <derekhawkins@y...>
> wrote:
>
> >
> > What does "work right" mean? There are tolerances in dimensions and
> > targeted positions after motion. Do you consider 10 mils of backlash
> > in a foam cutting CNC setup the result of a poor design for example?
>
>
> As soon as you need to compensate something isn't right ;-)
>
> 10mil in a foam cutter is probably below what you consider too much.
>
> ST