Re: [CAD_CAM_EDM_DRO] Torsion Test Results

Speaking of loads and twists...what would the load/twist etc. be if I had a
two hundred pound casting (being machined) on a table/cross slide assembly
which weighs about 150 pounds. The driven table uses a 54" long ball screw.
1-1/4" diameter.

Smoke
-----Original Message-----
From: Jon Elson <jmelson@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Saturday, November 11, 2000 11:32 PM
Subject: Re: [CAD_CAM_EDM_DRO] Torsion Test Results

>
>
>Mariss Freimanis wrote:
>
>> Hi,
>>
>> Ok, as promised, here's the results of my tests.
>>
>> The short answer is there is no significant difference which end of
>> the leadscrew the encoder is on.
>
>> The leadscrew simply did not twist enough to make any difference.
>> Pulsed torque 275 oz-in, 3/8" leadscrew, 30" travel.
>
>Fascinating! I'm amazed that you didn't see much twist under
>this setup. Now, one question - did you have a load on that
>leadscrew? (The significant difference between this test and the
>earlier one you reported was the big, heavy wrench on the end
>of the bar, which dramatically enhances the effect. The tiny rotational
>inertia of the encoder doesn't compare.)
>
>Jon
>
>
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