Re: [CAD_CAM_EDM_DRO] Spindle Control, using Hydraulics?

Hi Dan

I have a Leblond lathe that is set up the same way. It is an older NC
machine that I am retrofitting. I believe the model is a 12/12 turret lathe
or something similar. The RPM and direction of the spindle is controlled by
a synchronous stepping motor (the kind that runs on 60Hz AC) which in turn
controls the pump flow. The is a little servo controller that drives the
motor one way or the other to maintain the spindle speed as measured by a
tach generator.

That part of it works just fine but I have been considering replacing it all
with a big brushless motor because the hydraulically operated clutches that
select low, medium or high gear all have bad seals. If your lathe is the
same, do you have any idea of what is involved in replacing the clutch
seals?

Bob

----- Original Message -----
From: "danieltmedlin" <danieltmedlin@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, January 21, 2006 7:50 PM
Subject: [CAD_CAM_EDM_DRO] Spindle Control, using Hydraulics?


> Would it be possible, within reason to control spindle speed with a
> hydraulic unit?
>
> On my Lebond lathe the electric motor turns a variable displacement
> hydraulic pump that drives hydraulic motor, which turns the
> spindle/chuck.
>
> I wonder if a stepper motor could move the stroke control for the pump
> in a closed loop feed back system using Mach3 with a signal from a
> encoder on the spindle?
>
> Daniel T. Medlin
>
>
>
>
>
>
> 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
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> 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
>
>
> Yahoo! Groups Links
>
>
>
>
>
>