My Cnc build

[kingcreaky]

Kingcreaky, thanks for the reply and you mentioned reducing the x axis....is this a solution only if my steppers and the controls havent got a good enough resolution?

It does go very slow to extremely fast depending on the settings.
Cheers for now Tommy

Due to a lack of response of any more concise, studious, or literate members I shall do my best to try and explain. However Id urge you to check this explanation before taking it as gospel.

assuming your gantry is being driven by 1 stepper either side, each stepper direct driving a cog running on the rack.. Il assume that one turn of the cog, will move the gantry about 1" or say 25mm. Im unsure of exactly why, and this is the basis of my argument, so Il hold my hand up if im wrong, but although the stepper drivers allow you to go to a crazy resolution (ie say 3200 steps per revolution) its not wise to be running in this setup. Ive always been advised to set them to something like 800 steps per rev. This maybe because all my machines have always ran direct off parallel port and I see you have a smooth stepper.

so, assuming one revolution of your drive cog, moves 25mm along the rack. that means, when your setting up mach and you have to tell it your steps per mm your figure is going to be

800 / 25mm = 32 steps per mm

essentially, the greater you can make the steps per unit, the greater the resolution of the machine... but of course, lower top speed etc


hence my comment, I would expect to see that pinion cog being driven by a belt. and the the belt changing the ratio of the drive from 1:1 to something like 12:1

just bear this in mind, its not necessary a show stopper.

Love the pictures though... keep them coming

matt