Mendel software and hardware interface question

Hi,
I am trying to build a reprap printer and I need to understand some technical issues before I start.
- I am trying to understand the mechanics of the software and the hardware relation in the prusa.
- As we all know there is two types of prusa ( metric and SAE).
- my question is the following:
since the SAE and metric differ in the thread pitch which means the two produce different linear motion for the same servo motion which translates into scaling issues.
- Is there any easy way in the software to adjust for the differences?

Compensating for the pitch differences is extremely easy. All you have to do is calculate the steps per mm of travel of the axis, and input that in the firmware. That.s it.

Thanks for reply

- So there is a way to input such parameters in the firmware.
I assume that this could be used to adjust for any gearing issues in case I deviated from the original design?

Is there any firmware parameters that control the extruder feed rate ?

vortexflow2010 Wrote:
-------------------------------------------------------
> Thanks for reply
>
> - So there is a way to input such parameters in
> the firmware.
> I assume that this could be used to adjust for any
> gearing issues in case I deviated from the
> original design?

Exactly. I use a RepStrap with firmware that would run a Mendel just fine, however my parameters are way different. The steps_per_mm for each axis will change based on the microstepping you use too. The 5D firmware treats the extruder as just another axis, so you set the steps_per_mm of feedstock similarly. If you use the latest version of skeinforge, which is version 40 or greater, the steps_per_mm for the extruder needs to be set as the steps per mm of feedstock fed into the extruder. Earlier versions, and the RepRap host software (as far as I know) use a firmware setting of steps per mm of extruded plastic.

Thank you for your answers