Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive

on 2003-01-04 00:00:29 UTC

It's not current and I don't have a pic of it as of then. It's not hard to
sketch out though, just put motor inline with the screw and draw in a link
running off parallel to the plane of motor flange and tangent to the bolt
circle.

At 08:08 AM 1/3/03 -0800, you wrote:

>Hoyt,
> I'd really like to see a photo of that arrangement, if if you have one
>available.
>
>Marv Frankel
>Los Angeles
>
>----- Original Message -----
>From: <bjammin@...>
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Sent: Friday, January 03, 2003 8:34 AM
>Subject: Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive
>
>
>> At 08:17 AM 1/3/03 -0000, you wrote:
>> >With direct drive, unless you are very confident of the alignment of
>> >motor spindle with the screw, you should always use a coupling that
>> >is tolerant of misalignment;
>>
>> Not at all ... I hung motors directly on screws once using rigid
>couplings,
>> which I made in one op for good concentricity. The motors just overhung
>the
>> screw ends, right out in space. The motors were drag-linked to the machine
>> frame using a stay from flange to the anchor point. The stay can be
>> slightly flexie from side to side as long as it doesn't stretch or shrink
>> when torque is applied. This is the most rigid arrangement possible for
>> transmitting torque, and the motor and screw bearings have no trouble
>> supporting the motor weight. Try it, it's clean, simple, quick and very
>> effective.
>>
>> Regards, Hoyt McKagen
>>
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>OFF Topic POSTS: General Machining
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aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.

>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a

sister site to the CCED group, as many of the same members are there, for
OT subjects, that are not allowed on the CCED list.

>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.

DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........

>bill
>List Mom
>List Owner
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>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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>

Regards, Hoyt McKagen

To prevent virus propogation, please don't put this addy in your book
Belfab CNC - http://www.freeyellow.com/members/belfab/belfab.html
Best MC - http://www.freeyellow.com/members/batwings/best.html
Camping/Caving - http://www.freeyellow.com/members/batwings/caving.html
Two-Wheel-Tech List - http://batwings.freeyellow.com/2whfaq.html
Religious strife proves that there's no God

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