Re: [CAD_CAM_EDM_DRO] Digest Number 1120
Posted by
Bill Griffin
on 2001-02-10 17:05:10 UTC
----- Original Message -----
From: CAD_CAM_EDM_DRO@yahoogroups.com
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Saturday, February 10, 2001 12:05 AM
Subject: [CAD_CAM_EDM_DRO] Digest Number 1120
Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
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bill,
List Manager
FAQ: http://www.ktmarketing.com/faq.html
------------------------------------------------------------------------
There are 11 messages in this issue.
Topics in this digest:
1. Re: cast iron
From: machines@...
2. Re: Sherline Z backlash Nut/fix
From: "tauseef" <alieron@...>
3. Re: Building a CNC Router
From: "Doug Harrison" <prototype@...>
4. Re: Building a CNC Router
From: wbhinkle@...
5. Sorry Jon, it wasn't there....
From: dougrasmussen@...
6. Cams on
From: dragonpit@...
7. Cast iron: one can of worms, pull up resistors another?
From: "Donald Brock" <don.pat.brock@...>
8. RE: Cast iron: one can of worms, pull up resistors another?
From: "Tim Goldstein" <timg@...>
9. cast iron and lurkers
From: "R. T. Robbins" <rtr@...>
10. Re: cast iron and lurkers
From: davemucha@...
11. Re: Sorry Jon, it wasn't there....
From: dave engvall <dengvall@...>
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Message: 1
Date: Sat, 10 Feb 2001 00:03:25 -0000
From: machines@...
Subject: Re: cast iron
Just my 2 cents worth.
A few years ago we were modifying vintage motorcycles into vintage
racing motorcycles - worth more money <g>
All the old frame lugs were made from mallable iron and pinned and
brazed on. Made enquiries at local foundries and found mallable iron
was no longer cast. We were advised to use SG Iron [ Spheridol
Graphite <sp> ] as it was a nearer to mallable. After being cast
these were sent for heat treatment which was about 24 hours at
something like 1200 degrees and a slow cool down. Once we got them
back we could split them with a hacksaw, heat them up and spread them
open so they fitted over the tubes. Once closed up they were then
brazed up. I noticed on working these fittings that they performed
more like steel than cast iron. No way even heating a cast iron lug
up you could expand it to go over a 1 1/2" tube without cracking.
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Message: 2
Date: Sat, 10 Feb 2001 00:41:19 -0000
From: "tauseef" <alieron@...>
Subject: Re: Sherline Z backlash Nut/fix
sorry smoke! my fault! and yes it is getting closer to valentines
hehehe! sorry.
tauseef
--- In CAD_CAM_EDM_DRO@y..., "Smoke" <gordonr@r...> wrote:
> Can anyone tell me why I'm getting this post from tauseef so many
times?
>
> I've gotten it about 8 times already!
>
> Smoke
> -----Original Message-----
> From: tauseef <alieron@h...>
> To: CAD_CAM_EDM_DRO@y... <CAD_CAM_EDM_DRO@y...>
> Date: Friday, February 09, 2001 3:28 PM
> Subject: [CAD_CAM_EDM_DRO] Sherline Z backlash Nut/fix
>
>
> >Hey guys,
> >I found my z axis to have a whopping 0.26mm of backlash in it!
After
> >some thinking this is how I fixed the problem. Not sure if this is
> >the "best" way but it works well.
> >
> >I used the Z axis lock (came with the mauel mill) that they tell
you
> >not to use when converting to CNC. I tapped it, then turned it so
it
> >almost locks the axis (taking out the backlash) and then put a
braket
> >to hold it there. My backlash on my sherline 5410 went from 0.26mm
to
> >0.07mm! I also made the hole a little longer as to make the
backlash
> >nut adjustable as everything wears down. I put a pic up case anyone
> >wants to see and try it. Its under BACKLASH.
> >
> >http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/Tauseef%20Pics/
> >
> >So far excellent results!
> >thanks
> >tauseef
> >
> >
> >
> >
> >Welcome to CAD_CAM_EDM_DRO@e...,an unmoderated list for the
> discussion of shop built systems, for CAD, CAM, EDM, and DRO.
> >
> >Addresses:
> >Post message: CAD_CAM_EDM_DRO@y...
> >Subscribe: CAD_CAM_EDM_DRO-subscribe@y...
> >Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@y...
> >List owner: CAD_CAM_EDM_DRO-owner@y..., wanliker@a...
> >Moderator: jmelson@a... timg@k... [Moderator]
> >URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >bill,
> >List Manager
> >
> >FAQ: http://www.ktmarketing.com/faq.html
> >
> >
________________________________________________________________________
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Message: 3
Date: Fri, 9 Feb 2001 19:51:42 -0500
From: "Doug Harrison" <prototype@...>
Subject: Re: Building a CNC Router
Fudd;
If you do a search for "cnc router" you will find several sites where DIY
types have posted their projects. Seems everyone is getting into it.
Here are some good places to start:
http://www4.bcity.com/datacut/
http://www.bmumford.com/index.html
http://www.boondog.com/
http://www.campbelldesigns.com/
http://www.torchmate.com/
http://www.diversi-tech.com/autorout.htm
http://www.larkencnc.com/
http://www.super-tech.com/
Doug
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Message: 4
Date: Fri, 9 Feb 2001 19:54:01 EST
From: wbhinkle@...
Subject: Re: Building a CNC Router
campbell-designs is in the Dallas, Tx area. i have meet Mr. bob Campbell at a
meeting there. He is a real interesting person to talk to.
bill hinkle
in Oklahoma
[Non-text portions of this message have been removed]
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Message: 5
Date: Sat, 10 Feb 2001 02:20:33 -0000
From: dougrasmussen@...
Subject: Sorry Jon, it wasn't there....
Jon,
I went to Boeing to find your thingie. Looked all around the area
where Dave said he'd seen it. Wasn't there. Not surprising, some
things move out of there so fast you'd never know they were ever
there.
Speaking of a trip to the area to shop at Boeing. That can be
worthwhile or a dead end. Us locals like to gloat about the deals we
get, but keep in mind we don't tell you about the many times we come
up dry. Like yesterday, I couldn't anything to buy.
Doug
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Message: 6
Date: Sat, 10 Feb 2001 02:58:01 -0000
From: dragonpit@...
Subject: Cams on
Got the x-axis nut fixed on the plotter/engraver
maybe I'll be able to let it do its good now.
cams at
http://dragonpitdesigns.com/lathecam.html
I'm doing a photograph in wax of a dragon
I'll be casting out of brass for my front door
then I'll get on with the mini h-mill
Henry ( Wood Dragon at http://dragonpitdesigns.com )
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Message: 7
Date: Sat, 10 Feb 2001 03:09:46 -0000
From: "Donald Brock" <don.pat.brock@...>
Subject: Cast iron: one can of worms, pull up resistors another?
I have another can of worms I want to open up. I'm sure I'm going to
get many opinions on this one but, let us see.
My question today is what value resistor(s) work best for use as pull
up resistors. I would like to know what value would be the best
choice and on what that recomendation is based on.
I've purchased two of the Camtronics interface boards since October
of last year and on one Dan supplied 4.7 K resistor networks and on
the other 10K resistor networks. The first was used with his 5A
stepper drives the second was intended to be used with a Gecko 320's
setup (and yes I know the pull up resistors are in the drives already
eliminating the need for external pull-up resistors) but I am
wondering about why the huge differance in values in the pull-up
resistors supplied. What formula should be applied when choosing
these values and why?
The reason I ask is that I am breadbording my own interface for use
with EMC on a mill/drill. Anyone care to comment?
Donald Brock
________________________________________________________________________
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Message: 8
Date: Fri, 9 Feb 2001 21:55:44 -0800
From: "Tim Goldstein" <timg@...>
Subject: RE: Cast iron: one can of worms, pull up resistors another?
My non-expert seat of the pants answer is that either one is fine and is
considered an normal value for a pull up. On a 5 v line the 10K will let .5
ma through and the 4.7K will let 1 ma through. So, if it was very important
to minimize current consumption (batteries) then the 10k would be better,
but if swinging the line faster is more important than the 4.7k would work
better.
I am sure on of the electronic pros on the list will give you the real
explanation.
Tim
[Denver, CO]
> I have another can of worms I want to open up. I'm sure I'm going to
> get many opinions on this one but, let us see.
>
> My question today is what value resistor(s) work best for use as pull
> up resistors. I would like to know what value would be the best
> choice and on what that recomendation is based on.
>
> I've purchased two of the Camtronics interface boards since October
> of last year and on one Dan supplied 4.7 K resistor networks and on
> the other 10K resistor networks. The first was used with his 5A
> stepper drives the second was intended to be used with a Gecko 320's
> setup (and yes I know the pull up resistors are in the drives already
> eliminating the need for external pull-up resistors) but I am
> wondering about why the huge differance in values in the pull-up
> resistors supplied. What formula should be applied when choosing
> these values and why?
>
> The reason I ask is that I am breadbording my own interface for use
> with EMC on a mill/drill. Anyone care to comment?
>
> Donald Brock
> FAQ: http://www.ktmarketing.com/faq.html
________________________________________________________________________
________________________________________________________________________
Message: 9
Date: Fri, 09 Feb 2001 21:03:48 -0800
From: "R. T. Robbins" <rtr@...>
Subject: cast iron and lurkers
This list has quality people - the regular contributors and the lurkers.
The regular contributors have great insights on a wide range of relevant
subjects. The lurkers add their considerable experience when appropriate.
It is silly to judge a list by the number of posts. The quality of the
posts is so good that strings like "cast iron" are a joy to all of us.
We are all busy people. Filling this list with garbage reduces the
membership because we then have to wade through too much stuff that isn't
relevant to our interests, or to which we have nothing useful to add.
Twenty or 30 posts a day from this large list maintains high quality. I
know really good people have had to leave the list because they don't have
time to wade through 40 or more posts on a daily basis.
On to CAST IRON! I have done substantial work in the plants of the makers
of large machine tools. I saw large, expensive castings rusting in the
snow and asked about the reasoning for tieing up the working capital in
castings aging in snowbanks. I was told that they (In agreement with
earlier postings.) had to cycle through long seasonal changes, and that
there wasn't enough temperature changes in the sunbelt.
I suspect there are other historical reasons for machine tool builders
locating in less pleasant climates, but the argument for thick cross
sections needing these long temperature cycles, sometimes lasting more than
a single year, is, in part, that this source of energy is cheap and
effective. There is little invested in a raw casting sitting out in the
weather. During recessions, they just continue to sit outside, consuming
relatively little cost, but they are ready when orders pick up again.
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Message: 10
Date: Sat, 10 Feb 2001 06:20:08 -0000
From: davemucha@...
Subject: Re: cast iron and lurkers
I too have really enjoyed this long thread.
It was after reading about ageing cast iron for days, then watching a
show on PBS about world war II figher planes.
The extradinoray developemnt of technology in such a short time, from
bi-planes to jet fighters... OK, so back to cast iron.
Obviously there was absolutly no time to age an engine block for a
fighter plane or even the huge blocks for freighter ships and tank
engines. Many planes and ships were lost well before the engine
block even started to stress relieve itself from natural causes.
I know that we chase molecules for accuracy, but how bad was it in
those days? did they have head gasket leaks or siezed motors? or
just sloppy fits and let the grease and oil fill the gaps? We may
never know becasue this thread doesn't go back that far. :)
From what I've gathered, heat treating can do a goodly amount of
relieving the pressures, both crystiline and stress, and the aging
cycle does even more. Seems if I was to build a new machine, I'd be
too impatient to wait. If I had the funds, I'd get two castings.
I'm waiting for my 7x10 to arrive. HF, ordered in late Janurary,
already got my first notice it's B/O. :( I will be very careful to
inspect the linearity of the ways, and will put it on a surface plate
to check the parellel tolerance of them too.
I almost want to order a second, and leave it in the back yards for a
few years. If I went that far, I'd have to chrome the ways for
longevity.
This site is invaluable to someone like me. No experiance because
the lathe hasn't arrived yet, but I already know what to look for.
Thanks all.
Dave
--- In CAD_CAM_EDM_DRO@y..., "R. T. Robbins" <rtr@n...> wrote:
> This list has quality people - the regular contributors and the
lurkers.
> The regular contributors have great insights on a wide range of
relevant
> subjects. The lurkers add their considerable experience when
appropriate.
> It is silly to judge a list by the number of posts. The quality of
the
> posts is so good that strings like "cast iron" are a joy to all of
us.
>
> We are all busy people. Filling this list with garbage reduces the
> membership because we then have to wade through too much stuff that
isn't
> relevant to our interests, or to which we have nothing useful to
add.
> Twenty or 30 posts a day from this large list maintains high
quality. I
> know really good people have had to leave the list because they
don't have
> time to wade through 40 or more posts on a daily basis.
>
> On to CAST IRON! I have done substantial work in the plants of the
makers
> of large machine tools. I saw large, expensive castings rusting in
the
> snow and asked about the reasoning for tieing up the working
capital in
> castings aging in snowbanks. I was told that they (In agreement
with
> earlier postings.) had to cycle through long seasonal changes, and
that
> there wasn't enough temperature changes in the sunbelt.
>
> I suspect there are other historical reasons for machine tool
builders
> locating in less pleasant climates, but the argument for thick cross
> sections needing these long temperature cycles, sometimes lasting
more than
> a single year, is, in part, that this source of energy is cheap and
> effective. There is little invested in a raw casting sitting out
in the
> weather. During recessions, they just continue to sit outside,
consuming
> relatively little cost, but they are ready when orders pick up
again.
________________________________________________________________________
________________________________________________________________________
Message: 11
Date: Fri, 09 Feb 2001 19:01:23 -0800
From: dave engvall <dengvall@...>
Subject: Re: Sorry Jon, it wasn't there....
dougrasmussen@... wrote:
> Us locals like to gloat about the deals we
> get, but keep in mind we don't tell you about the many times we come
> up dry. Like yesterday, I couldn't anything to buy.
>
> Doug
Too bad it wasn't there but life is like that. One learns to grab things when you see them because 5 min later
they may not be there. Had lots of dry runs....and remember I'm a solid 2 freeway ( @75) hours away.
Maybe next time. :-)
Dave
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[Non-text portions of this message have been removed]