Re: Max feedrate

"knives01us <knives01@a...>" <knives01@a...> wrote:

> I'm kind of new to Flashcut & CNC myself, but when I was setting up
> my machine I discovered that it will only tolerate about 1/3 the
> seperate axis feedrate when doing a 2 axis move. Test it yourself
> with a simple G code program like:
>
> G01 X5 Y3 F (fill in your test feed rate)
> G01 X0 Y0
>
> and check to see if steps are lost. I got the circular

interpolation

> figure much the same way, having the machine do a 2" circle drawn

in

> Cad and converted to G code until I found a speed that didn't drop
> steps, which was only about 1/6 of the fastest single axis move
> possible.
>
> Once you get the fastest feedrates for these 2 settings, you'll
> probably want to derate them to %70 of their values for reliability.
> Now that I have the machine setup right, it will run hours on end
> with no step loss.

Hi,

I have a Dan Mauch 2A board driving Sherline supplied stepper on a
Sherline mill, wired half coil, set for half-stepping.

It can only manage 18ipm before the motor begin to stall. I don't
have a dial gauge so I have to guess the setting for max. feedrate.

> my machine I discovered that it will only tolerate about 1/3 the
> seperate axis feedrate when doing a 2 axis move.

Would the above mean I should set the max. feedrate to only 6 ipm?

Is that a reasonable figure or should I be more ambitious?

Thanks

Pete