I'm wondering why people aren't considering the 2000 year old techniques used by architects in Japan (through to today) where you create a structure inside the structure you want to dampen that creates balanced movement to counteract the troublesome movement.
I'm not a mechanical engineer so this is over my head. But, from an idea perspective, it's got to be better than dangling cinderblocks over your head.
P.S. All my forum emails go to an account I never look at. Big timesaver...
--- In GrizHFMinimill@yahoogroups.com, "Rob Potter" <rob@...> wrote:
>
> Barry,
>
>
>
> I'd like to respectfully disagree a bit. I understand your point, but I'm as
> interested in "machine SHOP" as in machining specifically. I find an
> occasional side trip for discussions about shop setup useful (especially
> given how crowded my little shop is). And if I'm not interested in a topic
> that others want to pursue, I can always use the 'Delete' key. Unless, of
> course, we're using up some type of resource that I'm unaware of.
>
>
>
> Just my two cents.
>
>
>
> Rob Potter
>
> Portland, Oregon
>
>
>
>
>
> From: GrizHFMinimill@yahoogroups.com [mailto:GrizHFMinimill@yahoogroups.com]
> On Behalf Of Barry Young
> Sent: Sunday, January 22, 2012 8:49 AM
> To: GrizHFMinimill@yahoogroups.com
> Subject: Re: [GrizHFMinimill] Re: Counterweight Arrangement
>
>
>
>
>
> And now back to our regularly scheduled topic "machining"
>
>
>
> Everybody get off this ceiling joist misdirection and move back to machining
> now.
>
>
>
> Thank you
>
>
>
> Barry Young
>
>
>
>
>
>
>
> _____
>
> From: Richard <rwskinner@...>
> To: GrizHFMinimill@yahoogroups.com
> Sent: Saturday, January 21, 2012 10:24 AM
> Subject: Re: [GrizHFMinimill] Re: Counterweight Arrangement
>
>
>
>
>
> I've pulled many a 350 small block from wrapping a chain around the ceiling
> joist in the garage. I did it for years with no issue. I was pretty
> worried the first few times I did it. I was about 4 or 5 feet away from the
> garrage wall. Not even any cracked sheet rock.
>
>
>
> Richard
>
>
>
>
>
>
>
>
>
> ----- Original Message -----
>
> From: Leo Reed <mailto:lpreedzone@...>
>
> To: GrizHFMinimill@yahoogroups.com
>
> Sent: Saturday, January 21, 2012 10:35 AM
>
> Subject: Re: [GrizHFMinimill] Re: Counterweight Arrangement
>
>
>
>
>
> .... and ceiling joists tie the top of opposite walls together. Helps keep
> roof rafters from pushing outer walls out of plumb.(except for cathedral
> ceilings... where they don't exist! wonder if these walls should have
> buttresses on the outer walls?) 8-)
>
>
>
> Leo (pearland, tx)
>
>
>
>
>
> ----- Original Message -----
>
> From: Randolph <mailto:randolph@...>
>
> To: GrizHFMinimill@yahoogroups.com
>
> Sent: 1/20/2012 10:48:34 PM
>
> Subject: Re: [GrizHFMinimill] Re: Counterweight Arrangement
>
>
>
>
>
> Ollie,
>
> What kind of building do you live in?
>
> I've had to walk around in many attics to do electric work etc. and the
> ceiling joists hold my 200 pounds very well.
>
>
>
> Randolph
>
>
>
>
>
> On Jan 20, 2012, at 4:41 PM, Oliver Fick wrote:
>
>
>
>
>
>
>
>
>
> Be careful. Ceiling joists are only designed to support the weight of the
> dry wall and insulation. They are not designed to hold high point loads.
> This is what has discouraged me from using the ceiling joist option.
>
> Ollie
>
>
> _____
>
>
> From: GrizHFMinimill@yahoogroups.com [mailto:GrizHFMinimill@yahoogroups.com
> ] On Behalf Of kr98664
> Sent: Friday, January 20, 2012 1:37 PM
> To: GrizHFMinimill@yahoogroups.com
> Subject: [GrizHFMinimill] Re: Counterweight Arrangement
>
>
>
>
> Hi Roger,
>
> Thanks for the comments. As far as a pulley arrangement, I'd have to run a
> cable straight up to a ceiling joist if I wanted the lifting force applied
> at the spindle end. I wouldn't be able to use David's slick semi-hidden
> version inside the vertical column. Over the weekend, I plan to play, I mean
> do a controlled scientific experiment, to see if there any advantage to my
> idea. One big drawback is an overhead cable will get in the way, versus
> David's semi-hidden version. It could be that my cure is worse than the
> disease, especially where David says he is very pleased with his results. I
> will find out this weekend.
>
> Regards,
>
> Karl
>
> --- In GrizHFMinimill@yahoogroups.com
> <mailto:GrizHFMinimill%40yahoogroups.com> , "Roger Blair" <Roger.Blair@>
> wrote:
> >
> > Karl,
> >
> > (IMHO)
> >
> > Issue 1.
> >
> > To compensate some for gib play, attach the counterweight near the spindle
> end of the head, and ensure that it is heavier than the
> > head weight enough to hold the spindle/tool in the same angular position
> as when the tool loads into the work. (eliminating slack
> > motion)
> >
> > Issue 2.
> >
> > In theory, adding a second pulley at or near the spindle end of the head
> will introduce a much greater moment arm on the vertical
> > column than from the center of David's single roller to his attach point,
> and the higher the head position is on the column, an
> > extended arm will cause the column to bend more. If there is a measurable
> effect, only stiffening the column will correct for that.
> >
> >
> >
> > Roger
> >
> >
> >
> > From: GrizHFMinimill@yahoogroups.com
> <mailto:GrizHFMinimill%40yahoogroups.com>
> [mailto:GrizHFMinimill@yahoogroups.com
> <mailto:GrizHFMinimill%40yahoogroups.com> ] On Behalf Of kr98664
> > Sent: Thursday, January 19, 2012 02:09
> > To: GrizHFMinimill@yahoogroups.com
> <mailto:GrizHFMinimill%40yahoogroups.com>
> > Subject: [GrizHFMinimill] Re: Counterweight Arrangement
> >
> >
> >
> >
> >
> >
> > Hi David,
> >
> > I like your idea to use a nylon strap, especially how well the bend radius
> compares to the more typical steel cable. I had already
> > been planning to do that.
> >
> > While brainstorming the installation, I got to wondering if there was
> anything to be gained by applying the lifting force at the
> > spindle end, away from the gibs. There will always be some amount of play
> as the head rocks up/down on its gibs, so I'd like to take
> > out as much play as possible by lifting the spindle end of the head.
> Granted, the pulley arrangement would no longer be as clean and
> > simple as your design, so there would be a trade-off.
> >
> > --- In GrizHFMinimill@yahoogroups.com
> <mailto:GrizHFMinimill%40yahoogroups.com>
> <mailto:GrizHFMinimill%40yahoogroups.com> , "a3sigma" <dcclark111@> wrote:
> > >
> > > Hi Karl,
> > >
> > > My counterweight scheme continues to work very well for me. See my files
> at:
> > >
> > > http://groups.yahoo.com/group/GrizHFMinimill/files/D.C.%20Clark%20stuff/
> > >
> > > Note also my thrust washer file. I have several sets remaining, and my
> offer still stands to give a set to any member who sends me
> > a SASE. Email me off list for my address.
> > >
> > > David Clark in Southern Maryland, USA
> > >
> > >
> > >
> > > --- In GrizHFMinimill@yahoogroups.com
> <mailto:GrizHFMinimill%40yahoogroups.com>
> <mailto:GrizHFMinimill%40yahoogroups.com> , "kr98664" <kr98664@> wrote:
> > > >
> > > > Hello All,
> > > >
> > > > I've been looking at options to minimize the Z-axis drop on my
> Micro-mark mill. I've read plenty about gas lifts and
> > counterweights. In both cases, the upward force is close to the vertical
> column. No matter how well the gibs are adjusted, any play
> > is magnified and the spindle end can still tip down a tiny bit.. My
> thoughts are if I apply the lifting force (via a counterweight)
> > near the spindle, this will practically eliminate any Z-axis play, even
> more so than a gas spring or counterweight nears the gibs.
> > > >
> > > > Any thoughts? Am I out in left field?
> > > >
> > > > Thanks,
> > > >
> > > > Karl
> > > >
> > >
> >
>
> size=1 width="100%" noshade color="#a0a0a0" align=center>
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com/>
> Version: 2012.0.1901 / Virus Database: 2109/4755 - Release Date: 01/20/12
>
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