Home speed in RepRap host - how to contro it?

I have a junkstrap, that has a high gear ratio on my x an y axes , which limits my speed to around 1000 mm/minute.

In the host software - the jog panel pays attention to this setting - but the home buttons do not - pressing home attempts to move all axes at somewhere around 3000 mm.minute - which is bad for my hardware.

Is there anywhere I can adjust the speed behind the home buttons?

Thanks

Just a guess, but in the 5D motherboard firmware configuration.h at line 150 you have:

//our maximum feedrates
#define FAST_XY_FEEDRATE 3000.0

Perhaps you can change it there and thus force it to 1000 mm/min?

You can also set the feedrate in the preferences of the RepRap host. Are they ignored as well?

You may also need to turn off Accelerations, many repstraps don't like it enabled

Quote

[...] Accelerations, many repstraps don't like it enabled

Huh? I've heard of Skeinforge which can't get acceleration sorted in some recent version but other than that I don't see how the usage of acceleration makes a difference between different machines. Are you sure?

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Traumflug, t3kboi -

I'm no expert yet but at the start of Calibrating my Repstrap was fine when just jogging 10mm, but when I tried to Home it, then it started to use Acceleration and was not at all happy. So for my setup (and I expect many Repstraps/Junkstraps) I would recomend setting this to constant speed in the main Firmware, then you can tune it to your setup in Reprap host -

You need to change the Firmware (Config.h) to turn off Accelerations -
Towards the bottom of the file -

// Data for acceleration calculations
// Comment out the next line to turn accelerations off
#define ACCELERATION_ON

Change to ACCELERATION_OFF

You will also need to make sure Reprap Host has this set to -1
MaxZAcceleration(mm/mininute/minute)=-1

To Quote the Reprap manual -
"This is the maximum rate at which the machine can accelerate vertically (i.e. in Z). As G Codes are in mm/minute, this is in the rather eccentric unit of mm/minute2. If you want to run at constant speed, or you have RepRap firmware that does not support accelerations, setting this negative will turn off Z accelerations for the whole machine. "

Turning it off worked really well for me, but I plan to look again at Acceleration speed of my Repstrap at some point.

Sorry for the long delay - had relatives in town for the last 10 days.

So - my results: Changing the maximum XY fastfeedrates worked fine.

Acceleration - works fine on my repstrap (JacqueStrap - ee eez French..)

I set the acceleration start point to about 65% of my max feedrate - machine works well both with acceleration enabled or disabled.

I am tempted to leave it enabled - I figure there is a reason it was implemented.....

Thanks for the pointers.