Re: [CAD_CAM_EDM_DRO] Gecko problems - What is going on?

My Z axis is on the spindle and takes very little force . It is running
an 840 oz/in geared about 1.5 to 1 on a ball screw .
I can get you a picture of the Z drive if you want it ?
The knee on this mill takes a gorilla to crank , as the table must weigh
about 1,000 pounds , it is 30'" X54" & over an inch thick .

Ron K

George Taylor, IV wrote:

>Ron,
>
>I would like to put a servo on my Bridgeport knee.
>What motor did you use, geared/direct drive, and did
>you have to do the springs/pneumatic cylinders thing to
>get the knee to move? Putting a drive on the knee seems to
>provide a lot of advantages in setup, tool changing etc.
>plus, I don't really like driving the quill for the Z.
>Any pics of your setup? What did you use for a knee screw?
>
>Thanks
>
>George
>
>
>-----Original Message-----
>From: R Rogers [mailto:rogersmach@...]
>Sent: Friday, April 08, 2005 10:28 PM
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: Re: [CAD_CAM_EDM_DRO] Gecko problems - What is going on?
>
>
>I totally agree Les. I rarely read about a G320/340 blowing. I lost one
>because I didn't have the 100 volt 1000uF capacitor at each drive. My
>machine was idle and there was a few loud clunks and pops. Consulting
>Jon Elson and others it was determined that it was obviously spikes on
>the line coming in and the power supply was making that noise. Lost a
>drive as a result and it only blew the $2.00 cap inside the drive that I
>replaced and its back in service. Adding the large Caps at each Gecko is
>a must. They help protect the drives from line spikes and also assist in
>filtering the current going to the drive. Before I added them the Z
>motor driving the Bridgeport knee would warm significantly after an
>hour. Now I can drill holes all day and it stays cool. Made a world of
>difference.
>
>The stepper drives are the ones that are problematic. It really isnt the
>drive itself, they just require more care in setting up and are not as
>forgiving as the servo drives. They are much more complex from what I've
>read. Servo drives rarely ever blow. Bad connection on a stepper drive
>its gone. Bad connection on a servo drive and it just doesnt move until
>its reconnected.
>
>Ron
>
>Les Newell <lesnewell@...> wrote:
>
>It is the stepper drives that seem to have a high mortality rate with
>bigger motors. As far as I know the servos are rock solid. I have
>toasted 2 stepper drives but the servo drives are still working fine.
>
>Les
>
>lcdpublishing wrote:
>
>
>
>>There appears to be a number of people reporting problems of "Blowing"
>>Gecko servo drives. As Gecko has such a solid reputation overall
>>(many, many, positive posts), I am wondering what is going on.
>>
>>Is there something inherent in the design, wherein if you do "this"
>>then the drive will "Blow"? Just seems very strange that something
>>that works for a couple of months (years whatever), can suddenly blow.
>>I am planning a servo driven machine right now and I sure don't want to
>>
>>
>
>
>
>>end up watching the drives blow every couple of months because I
>>did "Something" that no one can determine what the cause is. This is
>>sort of "X files" spooky stuff.
>>
>>
>>
>>
>>
>>
>>
>>Addresses:
>>FAQ: http://www.ktmarketing.com/faq.html
>>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
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>>
>[Moderators]
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>>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>>
>>OFF Topic POSTS: General Machining
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>>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,
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>
>>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
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>THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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>>bill
>>List Mom
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>
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>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
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>Moderator: pentam@... indigo_red@... davemucha@...
>[Moderators]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto:
>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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>Yahoo! Groups Links
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>[Non-text portions of this message have been removed]
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>Addresses:
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>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
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>Moderator: pentam@... indigo_red@... davemucha@...
>[Moderators]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto:
>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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>Yahoo! Groups Links
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>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
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>Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto: 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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--
Ron Kline

American Precision Ceramics



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