Thanks Marcus for the ideas.  Front of the motor drives a 25:1 planetary 
reduction.  It has a larger shaft and 3/8" socket adaptor.  This is all for the 
power draw bar.
John

-----Original Message-----
From: marcus.bow...@visible.eclipse.co.uk 
[mailto:marcus.bow...@visible.eclipse.co.uk] 
Sent: June 25, 2023 2:48 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Drilling holes in the back of a stepper motor

On 2023-06-25 10:33, andrew beck wrote:
> Adapter plate sounds easiest to me
> 

+1 for an adapter plate; its much safer and also more versatile.
Have you thought of mounting the encoder parallel to the stepper, and 
using a small pulley and belt between the shafts. That might give you 
more mounting options.

Another option would be if the motor have long bolts running through 
from front to back, those could be extended to hold an adapter plate.

Or could the encoder be driven off the front of the motor, using the 
existing belt (if your setup uses one).

Marcus





> On Sun, 25 Jun 2023, 21:01 andy pugh, <bodge...@gmail.com> wrote:
> 
>> On Sun, 25 Jun 2023 at 04:31, John Dammeyer <jo...@autoartisans.com>
>> wrote:
>> 
>> > Is there any reason I can't clamp the motor in a vice and pop in two
>> holes
>> > and tap them with a bottom tap at the spacing of the mounting flange?
>> 
>> I have done it in-situ, but there really isn't all that much metal in
>> there.
>> 
>> I think pulling the back cover off (leaving the rotor in place) and
>> choosing your mounting point carefully would probably be best.
>> 
>> Or, as Gene says, use the existing holes, very short screws, and an
>> adaptor plate.
>> 
>> --
>> atp
>> "A motorcycle is a bicycle with a pandemonium attachment and is
>> designed for the especial use of mechanical geniuses, daredevils and
>> lunatics."
>> � George Fitch, Atlanta Constitution Newspaper, 1912
>> 
>> 
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>> 
> 
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