On Wed, 23 Apr 2008 [EMAIL PROTECTED] wrote:
> Date: Wed, 23 Apr 2008 09:14:49 -0600 (MDT)
> From: [EMAIL PROTECTED]
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Very low PRM system.
>
> Hi
> I want to describe my understanding for low feed system.
> I will use direct drive mounting and that mean 5 revolutions for 1 inch of
> travel per minute.
> 5 revolution times 360 degree is 1800 degree per 1 inch per minute.
> 0.0001 travel per minute means system will have 1.8 degree per minute.
> My system generate 8192 pulses per quadrate so 4 times 8192 =32768pulses
> per 360 degree of revolution.
> So, if I divide 32768 by 360 I will have pulses per 1 degree of
> revolution, = 91 pulse per degree.
> For 1.8 degree per minute I will have 1.8x91= 163.84 pulses per minute.
> Finally, in the case of feed 0.0001 inch per minute I will have 163.84
> pulses per minute.
> Per second it will be 163.84/60 = 2.731 pulses per second.
> So, is this enough pulses?
Enough for what? At that slow rate (with n o dynamic load) the servo system
will basically step one count at a time at the 2.7 Hz rate but each step will
only advance 600 nano inches, Are your mechanics good enough that this
matters?
Even with a variable load +-10 counts should be easy, this is only +- 6
micro inches...
Peter Wallace
Mesa Electronics
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