On Wed, 22 Jul 2020, John Dammeyer wrote:
Date: Wed, 22 Jul 2020 09:06:38 -0700
From: John Dammeyer <jo...@autoartisans.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "'Enhanced Machine Controller (EMC)'" <emc-users@lists.sourceforge.net>
Subject: [Emc-users] Calculating table acceleration. Was: Need help with
Bostomatic BD18-2 to linuxcnc
Ho Jon,
I've changed the subject line to be more relevant and corrected the gravity
value.
Now we have 1703 In/Sec^2 for maximum possible acceleration given the load and
torque ratings.
Is this including the ballscrew+motor inertia? this may be larger than the
linear motions reflected inertia
On my system in imperial units I have 2.5 inches/second and I randomly picked
the accel as 3x that. Does that mean I could set MAX_ACCEL to say 1700 and
get away with that or is that number abnormally high? I know I can try it but
I'd like to know if the math is accurate.
Probably not because of the drop in motor torque with speed as Sam mentioned
plus 1700 IPS/S and 2.5 IPS means full speed in about 1.5 ms. I doubt the bare
step motor could do that...
MAX_VELOCITY = 2.5 MAX_ACCELERATION = 7.5 What I'm trying to do with this tool
is to take out some of the guesswork or the accidental divide instead of
multiply.
And second question. If someone is using metric units for their system what
units are used to describe MAX_VELOCITY and ACCEL?
Is it mm/minute? Or mm/second? Or meters/second? Is the weight specified in
grams or kg?
I want to be able to make the checkbox convert the imperial < = > metric
correctly.
Thanks
John Dammeyer
Peter Wallace
Mesa Electronics
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