Re: Rack and pinion

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "dex367" <dexlabboy@l...>
wrote:

Dear Sir:
We used rack and pinion exclusively in our oxyfuel and plasma shape
cutting machines. We would spring load the pinion into the rack with
the resultant backlash being zero. We used 20 degree pitch angle
gears as they ran smoother. The separating force for 20 degree
components is tan 20 degrees or about .364 x the driving force. Hence
you can decide what preload you need. Most of the drive force on
these machines was due to acceleration forces. One could use a
lighter spring load for normal drive forces and use a rigid
mechanical stop placed maybe .025 inches away to handle acceleration
only forces.
Because we had good performance from rack and pinion, I tend to fafor
that means of drive.

Regards,
Jack C.

> I am starting a design of a system with a x axis using a rack and
> pinion. What amount of back lash would I expect using this type of
> system?
>
> Dex