Re: [CAD_CAM_EDM_DRO] Encoders on stepper motors.

Now that I think of it I did try the G340's on the first motor I mounted on
the Sherline and the G320's on the second motor I tested on the Sherline.
It is really amazing that some of my customers will not hesitate spending
$50 for an encoder but balk at the $29 difference between the G320 and G340.
You are absolutely correct that the G340 with a 500 CPR encoder would be a
better choice than the G320 with a 200 CPR on a Sherline.
I haven't used EMC for about a year now so I really can't comment on your
other question.
Dan
-----Original Message-----
From: Tom Eldredge <harmonyt@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Monday, March 26, 2001 8:43 AM
Subject: Re: [CAD_CAM_EDM_DRO] Encoders on stepper motors.

>Dan,
>
>Please comment on this configuration:
>
>EMC outputting step/direction, driving a gecko 340 drive, with the encoder
>feeding both the gecko drive and your emc/encoder feedback board.
>
>Thanks,
>
>Tom Eldredge
>----- Original Message -----
>From: Dan Mauch <dmauch@...>
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Sent: Sunday, March 25, 2001 11:45 AM
>Subject: Re: [CAD_CAM_EDM_DRO] Encoders on stepper motors.
>
>
>> In a properly constructed driver, with the properly set software
>> configuration and a proper machine you shouldn't lose any steps,

however,

>> in addition to what other folks have mentioned there is stepper motor
>> resonance problems to content with. Just take some steppers and lay them
>on
>> the bench and do a G02x1.y1.i2 command and watch the motors as the
>> transition from one direction to the other. That is generally when you
>will
>> note stepper motor resonance. The use of encoders and the software that
>can
>> utilize encoders helps, if not eliminates this problem. Deskncrt and EMC
>> both use the Kulaga/Mauch DRO boards to take encoder feedback and compare
>it
>> to values set in the .ini files. If the error is greater than the
>> zero(error) it tries to speed up the motor and if successful continues

the

>> toolpath. If the error is greater than the set value then the program

stop

>> all three axis and an error message is displayed. If you want to add
>encoder
>> feedback to your program MC5 then I would be willing to donate an
>assembled
>> board for the task. I guess the source code can be found in EMC
>> Dan
>> -----Original Message-----
>> From: Art Fenerty <fenerty@...>
>> To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
>> Date: Sunday, March 25, 2001 8:31 AM
>> Subject: [CAD_CAM_EDM_DRO] Encoders on stepper motors.
>>
>>
>> >Hi All:
>> >
>> > I might be missing something here. I have heard alot about encoders on
>> stepper motor systems increasing accuracy. Am I wrong or is the only
>purpose
>> of an encoder in a stepper
>> >motor system only used in the case of a stepper missing pulses? If the
>> stepper never misses a pulse, the encoder does not do anything. The motor
>> can only be positioned to a multiple of its stepping resolution, right?

If

>a
>> motor misses pulses, isn't this an indication of a poorly powered stepper
>> >system? I get the strange feeling I'm missing something obvious.
>> >
>> >Thanks,
>> >Art
>> >
>> >
>> >[Non-text portions of this message have been removed]
>> >
>> >
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>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems, for CAD, CAM, EDM, and DRO.

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