Re: [CAD_CAM_EDM_DRO] Re: Re: Servo Motor Shaft Modification

Scott and John,

I am importing some nice size 34 stepper motors with a 1/2" shaft with a
flat. I have two different sizes 640 oz/in and 1200 oz/in.

Bob Campbell
Bob@...
www.campbelldesigns.com
Breakout board
THC board sets
CNC router plans
Stepper Motors
VisualMill Basic

----- Original Message -----
From: "John Stevenson" <john@...>
To: "CAD_CAM_EDM_DRO@..." <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, April 30, 2005 6:13 PM
Subject: [CAD_CAM_EDM_DRO] Re: Re: Servo Motor Shaft Modification


>
>> First off, John you are a true craftsman.
>> Second,
>> I don't agree with you about the 3/8" shaft "hardly being strong
>> enough". NEMA 34 steppers have a 3/8" shaft and are made in
>> multiple stacks up to 2000 oz-in. Maybe they use a stronger
>> alloy for their shaft but they transfer a tremendous amount
>> of power through a 3/8" shaft. I don't know how much torque it
>> would take to twist a 3/8" shaft, but I'll bet it is more than
>> you are putting into the bridgeport. Someone correct me if I
>> am wrong.
>>
>> Scott
>
> Scott, possibly it would but I have taken a motor off the Bridgy that
> carries a H series timing belt and it's on 16mm bore.
> I can't swop the pulley on the Z axis spindle without a lot of bother as
> it's the integral one.
> Perhaps I go for overkill in mechical design but it seemed easier to me to
> use the existing
> pulley, belt and the rest and just mod the motor shaft to 16mm to match
> the pulley than
> to mod the motors shaft and pulley and loose rigidity in the meanwhile.
> If at a later date I can get some of the rare 90 volt servo's that some
> Beavers had fitted then
> these will just bolt on in place of the treadmill motors.
>
> One other point is I need the total length of 2" to clear existing casting
> and line up.
> Those type 34's on 3/8" do not use long slender shafts and limit them to
> about 1".
> I hate shaft extenders as they work the same way under side load as a
> milling cutter
> does in a drill chuck, they walk off, had to repair and replace many.
>
>
>
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