RE: [CAD_CAM_EDM_DRO] Re: Converting a rotary table

Ok, thanks. I had to "wiggle" the worm assembly out. By the way, is there
a preferred/suggested gear lubricant that's better suited for these
motorized applications? Also, would denatured alcohol, mineral spirits, or
something completely different be recommended for cleaning these things?

Andrey

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of cutsgems
Sent: Thursday, July 28, 2005 11:54 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Converting a rotary table

There are two setscrews on the side of the table. One allows you to
rotate the worm assy and adjust the backlash or disengage the worm.
the other retains the entire worm assy. Loosen both setscrews and the
worm assy. will pull free of the table. On the bottom there is a
large ring with a compression lock scheme. You loosen the locking
Screw then remove the ring and the table will come out of the base
casting.

My replacement table should be here today or tomorrow and I'll have
to disassemble it for cleaning. I'll photo document the proceedure
and post it to a website along with my mounting setup.

--C


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Andrey Lipavsky"
<alipavsky@i...> wrote:

> Are you saying you removed the worm gear and all? If so, how did

you get

> the thing apart?
>
> Andrey
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of cutsgems
> Sent: Wednesday, July 27, 2005 9:38 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Converting a rotary table
>
> I'm working on converting the LMS 1810. I have the mount made but I
> had to send the rotary table back due to the worm binding, waiting
> for a replacement.
>
> Basically what I did was disassemble the whole thing and solvent
> clean it. Relubricated with quality grease. Removed the handle and
> all associated parts leaving only the exposed shaft. The shaft is

8mm

> so I need either a Ruland 8mm to .250 coupler or I'll make one.
>
> Took a .375" thick 2.25" square aluminum and bored it to fit the OD
> of the worm body for a mount. Drilled for two set screws to secure
> it. Using ~ 2.25" spacers to attach the motor to the mount. I'll

post

> some pics in a few days when the replacement table arrives. I may
> remove the worm and machine the the ecentric piece that it fits

into

> so that I can put ball thrust bearings on either side to reduce
> friction.
>
> Resembles this commercially made product:
>
> http://jfettigmachines.com/images/hv1.JPG
>
> From this website
> http://jfettigmachines.com/
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Andrey Lipavsky"
> <alipavsky@i...> wrote:
> > Have any of you converted one of the "Little Machine Shop" rotary
> tables and
> > would be inclined to share your experience and/or advice? I
> scanned through
> > the files section but nothing jumped out at me.
> >
> > Thanks,
> > Andrey
> >
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of ibewgypsie
> > Sent: Tuesday, July 26, 2005 1:36 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: Windows timing subroutines, how do
> they work?
> > JitteryMonkey pic
> >
> > Howdy Mariss..
> >
> > Are ya after my heart and mind? I'll check it out. If you don't
> know
> > me, I love new toys.. Anything to make my machine better, quicker,
> > stronger, shinier.. (I bolted some polished stainless to it)
> >
> > I found your Jittery Monkey..
> > http://home.alltel.net\dec4857\jitterymonkey.jpg
> > http://home.alltel.net\dec4857\jitterymonkey1.jpg
> >
> > My page..
> > http://home.alltel.net\dec4857\index.htm
> >
> > David
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
> > <mariss92705@y...> wrote:
> > > David,
> > >
> > > Has happened already. Conventional constant contouring

techniques

> > > use "look-ahead" schemes and complex math to move at a constant
> > > velocity along a concatened line segment path.
> > >
> > > The G101 uses a velocity-word stream to the step pulse engine.
> This
> > > allows for a unique and very simple constant contouring method

I

> > > call "look-behind". Simply put, the generated velocity-words
> (along
> > > the concatenated path, no accel/decel) are passed thru a moving
> > > average filter whose output goes to the pulse engine.
> > >
> > > Some advantages over conventional techniques is this method
> requires
> > > no analysis of the line-segment coordinate data, uses only add,
> > > subtract and division by powers of 2 (bit right-shift). It
> natively
> > > adapts to the requested vector velocity, automatically

increasing

> the
> > > rounding at line-segment nodes the faster it goes. The filter

can

> be
> > > switched in and out on the fly to allow accel/decel where sharp
> > > direction changes are required.
> > >
> > > If you want to see it run, please see www.geckodrive.com, go to
> > > the 'support' page and pick the very last item listed (video).
> The
> > > pen in the video is tracing at 300 IPM on a 6" by 6" XY stage
> having
> > > 5 TPI screws. The motors are 3A/phase PK268s at 24VDC. The

drives

> are
> > > G201s. It could go much faster but the screws sound very

unhappy

> > > above 1,500 RPM.
> > >
> > > The file is about 5 megabytes so having a broadband connection

is

> a
> > > real plus.
> > >
> > > Mariss
> > >
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ibewgypsie"
> > > <ibewgypsie@h...> wrote:
> > > > What is probably needed? One Timing generator running at a
> obscene
> > > > speed, smaller processors that get a bluetooth into buffer

dump

> for
> > > > distance or usb, or? Each processor handles one axis, reading
> the
> > > > encoder to adjust it's own loop-feedback, running pulse ratio
> per
> > > main
> > > > engine. All interpolated, All with a error out line back to

main

> > > > source to err-out. Each axis dedicated to itself. Then here-

we-

> go..
> > > > Look ahead software that processes speed changes per gcode

line

> and
> > > > pid's it all to that frequency to make desired end of line
> > > directional
> > > > changes without losing it's interpolation between axis. Ramp
> up,
> > > Ramp
> > > > down each line is not a good way to machine, but the only

thing

> I
> > > have
> > > > saw on my machine.
> > > >
> > > > Will it happen, probably not.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <thom@t...>
> wrote:
> > > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
> > > > > <mariss92705@y...> wrote:
> > > > > > In my opinion it should not be the task of a PC to do
> > > the 'donkey
> > > > > > work' of generating step pulses be it Linux, DOS or
> Windows.
> > > That is
> > > > > > a task that belongs to dumb dedicated hardware.
> > > > > >
> > > > > > A PC is an 'intelligence engine'. It's task is to do a

lot

> of
> > > math
> > > > > > and make decisions. Its output product should go to
> a 'pulse
> > > engine',
> > > > > > hardware finely tuned to the task of generating of
> producing
> > > pure and
> > > > > > clean frequencies on demand from the PC.
> > > > > >
> > > > > > These are tasks are so diametrically opposed it's like
> using a
> > > claw
> > > > > > hammer for a screwdriver. In a pinch you can do it but

it's

> not
> > > > > > pretty.
> > > > > >
> > > > > > That also pretty much surmises what I have seen from most
> PC
> > > based
> > > > > > CNC programs. The step pulse phase jitter is horrible

even

> from
> > > the
> > > > > > most popular out there. The motors sound like a barrel of
> > > agitated
> > > > > > monkeys and I have the scope pixs to prove it.
> > > > > >
> > > > > > If things are going to be done right, the PC has to
> interface
> > > to some
> > > > > > kind of step pulse engine.
> > > > > >
> > > > > > The 'agitated monkey' part. Motors that sound like that

are

> > > being
> > > > > > robbed of their potential torque especially at high

speeds.

> > > Phase
> > > > > > modulation imposes unnecessary torque demands (infinite
> > > impulse
> > > > > > functions) on the motors. Said more simply, you pay for

all

> > > that
> > > > > > noise in performance.
> > > > > >
> > > > > > Mariss
> > > > > >
> > > > > >
> > > > > The problem in the past and currently in the present, is

that

> > > there is
> > > > > no "standard" for an external pulse generator so you end up
> > > having to
> > > > > buy a "system" that is composed of software and matching
> > > hardware.
> > > > > Your options start to dwindle and if you want/need/desire

to

> > > change
> > > > > the software you have to throw away the entire system. It
> would
> > > be
> > > > > like every car manufacturer deciding to use non-standard
> tires
> > > that
> > > > > only they provided or each TV network broadcating in a
> different
> > > > > format so you had to buy a set specifically for their

signal

> > > format.
> > > > > From a pure engineering standpoint it might make sense to
> hand off
> > > > > signal processing to another circuit like a DSP card, but

it

> > > needs to
> > > > > have an open set of standards that ANY software company

could

> > > write
> > > > > to. If it's going to end up as a PC perhipheral then it
> needs to
> > > have
> > > > > drivers or open standards that make it useful with

different

> > > > > programs. Show me a pulser card that is not single source,
> has
> > > open
> > > > > standards and is supported by multiple vendors (especially
> MACH)
> > > and
> > > > > I'll get in line to buy one.
> >
> >
> >
> >
> >
> > 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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> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,

wanliker@a...,

> > timg@k...
> > Moderator: pentam@c... indigo_red@q... davemucha@j...
> > [Moderators]
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> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this

to

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> > sister site to the CCED group, as many of the same members are
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> > List Mom
> > List Owner
> >
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>
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>
> Addresses:
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> [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:
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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

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you have trouble.
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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.
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