In order to determine possible cause of the lift and how to remove it all now so
that it can be reattached, you need to advise what you used to attach it
originally.

I use contact cement to attach laminate (standard for attaching laminate in most
situations involving laminate and wood - counter tops, etc.).  Depending on what
your altitude bearings are made of will determine ultimate method.  Assuming
plywood, apply one coat of contact cement to the bearings and let it dry
according to the directions, then apply a second coat.  When applying the second
coat to the bearings also apply a coat to the laminate.  After drying the
appropriate time, stick the laminate to the bearing and use a roller or clamp
jib to apply pressure and press the laminate onto the bearing.  This should last
a very long time.  (I use this method for my telescopes also when "laminating"
layers of wood together for furniture and cabinet making, etc.)

Tim Ulmer

--- In atm_free@yahoogroups.com, "davidfpitre" <davidfpitre@...> wrote:
>
>  Less than a year after attaching laminate to my 30" altitude bearings, it has
lifted up in the center....on both sides. Strange that it has separated in the
same place on both sides. It seems that it would have to have been pulled back
(from the end towards the center) in order to be raised in the center. Why would
it have lifted in the center?
>  I'm about to remove it and reattach it. Any advice on the procedure, or on
avoiding the same problem? The bearings are attached to the mirror box.
>  I'm undecided on contact cement vs 3M 77 aerosol.
>

----- Original Message -----

From: davidfpitre

To: atm_free@yahoogroups.com

Sent: Sunday, November 22, 2009 17:59

Subject: [atm_free] Attaching laminate to alt bearings

 

Less than a year after attaching laminate to my 30" altitude bearings, it has lifted up in the center....on both sides. Strange that it has separated in the same place on both sides. It seems that it would have to have been pulled back (from the end towards the center) in order to be raised in the center. Why would it have lifted in the center?
I'm about to remove it and reattach it. Any advice on the procedure, or on avoiding the same problem? The bearings are attached to the mirror box.
I'm undecided on contact cement vs 3M 77 aerosol.

Less than a year after attaching laminate to my 30" altitude bearings, it has
lifted up in the center....on both sides. Strange that it has separated in the
same place on both sides. It seems that it would have to have been pulled back
(from the end towards the center) in order to be raised in the center. Why would
it have lifted in the center?
  I'm about to remove it and reattach it. Any advice on the procedure, or on
avoiding the same problem? The bearings are attached to the mirror box.
  I'm undecided on contact cement vs 3M 77 aerosol.

Hi Berthold,  Nice video and yes much better spin in this lap action.  It looks
like the ZOC method of figuring.  You have about the correct turntable to
eccentric ratio.  I use 5.55:1.   You might want to check your ratio and make
sure it is not a rapidly repeating pattern.  If it is it can reduce radomization
of the figuring stroke.  Look on the Zambuto web group under the photos section
the diagrams folder and you will find an image for lap action.  This is the
pattern that the quil should make if it was marking on a piece of paper.  If you
end up with a 5 spoke repeating star I would try to alter the ratio.

Good luck Dave H.




--- In atm_free@yahoogroups.com, "Berthold Hamburger" <b-hamburger@...> wrote:
>
> Hi,
>
>
>
> I just uploaded a new video to youtube showing different offsets in an
> attempt to push correction to the edge. It is interesting to observer the
> swirl patterns especially in the last scene. This time the lap (140mm) is
> rotating according to textbook (for all of you who got a bit worried there
> ;-)
>
>
>
> http://www.youtube.com/watch?v=GAZgfZM0ofI
>
>
>
> Regards
>
>
>
> Berthold
>
>
>
> --
>
> Berthold Hamburger - Cellist/Spain
>
> Email: behambu@...
>
> http://www.artinso.com
>
> http://www.astro.artinso.com
>

What correction are you attempting to do?

Is the blank a sphere yet?

Rob

--- In atm_free@yahoogroups.com, "Berthold Hamburger" <b-hamburger@...> wrote:
>
> Hi,
>
>
>
> I just uploaded a new video to youtube showing different offsets in an
> attempt to push correction to the edge. It is interesting to observer the
> swirl patterns especially in the last scene. This time the lap (140mm) is
> rotating according to textbook (for all of you who got a bit worried there
> ;-)
>
>
>
> http://www.youtube.com/watch?v=GAZgfZM0ofI
>
>
>
> Regards
>
>
>
> Berthold
>
>
>
> --
>
> Berthold Hamburger - Cellist/Spain
>
> Email: behambu@...
>
> http://www.artinso.com
>
> http://www.astro.artinso.com
>

Wouldn't mind helping dave if there's something going on.

Tom

Dominic-Luc, I know you have had problems dealing with PP in the past, which
was why I said I know that it's not a perfect option, but it's the one that
is easiest for the greatest number to access. Which is also why I asked if
anyone had a better idea....

Personally I've never had a problem, but then I made a point of not
confirming anything but my address (9 years and two house moves ago), cards
and bank accounts remain unconfirmed. This means that I can transfer money
out of my PP account, but not into it, which means they can't dip into my
accounts, although they might be able to bill my CC, but that's real hard to
get away with now, and leaves the paper trail from hell. Besides PP went and
set up an Aussie arm, so they are now bound by not just US law, but also
Australian law, and our banking laws (no offence meant) are quite a bit
tougher than the US ones....

So I feel if not "safe" then acceptably low risk enough with the idea to
make the offer.

The next issue becomes one of if we go with the direct mail option, is Dave
ok with his address being passed around? Considering his sleeping
arrangements right now, I'd hazard it's a "no".

Just some thoughts to further things along.

Cheers, Thomas Janstrom.
Little Gems.
http://tjlittlegems.com
1 of 3 moderator "atm_free" yahoo group.

-----Original Message-----
From: Dominic-Luc Webb [mailto:dlwebb@...]
Sent: Monday, 16 November 2009 9:01 PM
To: Thomas Janstrom
Cc: 'Vladimir Galogaza'; atm_free@yahoogroups.com; 'ATM List'
Subject: Re: [ATM] [atm_free] Re: FW: David Harbour

On Mon, 16 Nov 2009, Thomas Janstrom wrote:

> So if anyone has a better idea or comment on this please chime in.
>
> Cheers, Thomas Janstrom.
> Little Gems.
> http://tjlittlegems.com
> 1 of 3 moderator "atm_free" yahoo group.

Paypal is very careful in hiding in the fine print that it IS NOT
a bank and some of us have been robbed by Paypal, especially those
outside USA where there is generally no legal recourse. Giving
money to Paypal is fundamentally no more secure than handing cash
over to a stranger on the street and hoping for the best. To that
end, people are better off sending money direct. After getting robbed
by Paypal (Jerry Brown offering greatest of support to Paypal, BTW),
it became clear to me cash in an envelope enjoys better security and
legal protection.

I would only send letter to David directly.

Dominic

Vladimir,

I'm quite happy to do the coordinating, but as I'm in Australia and you're
in Hungary, we'd have to find someone a bit more local to do the honours a
deliver whatever we end up with.

I know that the royalties from his book will add up to next to nothing,
being as you say he had to sell the rights to get it published, but for now
it's better than nothing.

So *if* we want to pass the hat around please let me know, and I'll set up a
special purpose PayPal account (I know about the problems with PP, but there
are few other options available that are as internationally accessible, if
you have a better option please let me know off list), and when the
donations stop (or at the end of each month if it works out that way) I will
find a way to get it all to him, even if I have to mail it to him, but I'd
prefer it if we could find a member to present the proceeds in person....

So if anyone has a better idea or comment on this please chime in.

Cheers, Thomas Janstrom.
Little Gems.
http://tjlittlegems.com
1 of 3 moderator "atm_free" yahoo group.


-----Original Message-----
From: atm-bounces@... [mailto:atm-bounces@...] On Behalf Of
Vladimir Galogaza
Sent: Sunday, 15 November 2009 5:01 PM
To: atm_free@yahoogroups.com
Cc: ATM List
Subject: Re: [ATM] [atm_free] Re: FW: David Harbour

I think that what Thomas proposed is closest to be efficient. Buying the
book
is unfortunately not, because David sold the rights to publisher and will
get
practically nothing. David told me that when  I ordered the book.
I  think that Richard (S) who cared most for David in "real time" and with
real actions,
can suggest what kind of help we can do to be practical and efficient.
I am in, and will accept his proposals fullhartedly.

Regards
Vladimir.

_______________________________________________
ATM mailing list http://www.atmlist.net/

Thanks Berthold
Wonderful Video
Are you doing C-O-C o r is the tool offset for deepening the center?
Ulhas

--- In atm_free@yahoogroups.com, "Berthold Hamburger" <b-hamburger@...> wrote:
>
> Hi Dave,
>
>
>
> Thanks for your input!
>
>
>
> Most likely a bit overpressed. However, contact is very good and as someone
> on another group mentioned that could be also the cause for it not spinning
> freely. The results of its action are nevertheless good and I will give it a
> good workover and microfacetting.
>
>
>
> Berthold
>
>
>
> --
>
> Berthold Hamburger - Cellist/Spain
>
> Email: behambu@...
>
> http://www.artinso.com
>
> http://www.astro.artinso.com
>
>
>
> From: atm_free@yahoogroups.com [mailto:atm_free@yahoogroups.com] On Behalf
> Of zway2bisfancyfree
> Sent: domingo, 15 de noviembre de 2009 10:39
> To: atm_free@yahoogroups.com
> Subject: [atm_free] Re: MOM figuring
>
>
>
>
>
> Hi Berthold. It looks like you have about the right ratio of stroke to
> turntable speed which is good for figuring but the lap should spin close to
> the turntable rate and indicates not perfect contact. This can be caused by
> under pressing the lap and over pressing the lap. It can also be caused by
> the channeling of the lap. When it is perfect it will spin at about 3.5 RPM.
>
> FYI Dave H.
>
> --- In atm_free@yahoogroups.com <mailto:atm_free%40yahoogroups.com> ,
> "Berthold Hamburger" <b-hamburger@> wrote:
> >
> > While the lap has to rotate during polishing, it is not supposed to do so
> > during figuring.
> >
> > Turntable and eccentric speeds are reversed for figuring, so TT turns at
> 3.5
> > rpm while eccentric turns at 20 rpm.
> >
> >
> >
> > Berthold
> >
> >
> >
> > --
> >
> > Berthold Hamburger - Cellist/Spain
> >
> > Email: behambu@
> >
> > http://www.artinso.com
> >
> > http://www.astro.artinso.com
> >
> >
> >
> > From: atm_free@yahoogroups.com <mailto:atm_free%40yahoogroups.com>
> [mailto:atm_free@yahoogroups.com <mailto:atm_free%40yahoogroups.com> ] On
> Behalf
> > Of Idle-Tyme
> > Sent: domingo, 15 de noviembre de 2009 4:14
> > To: atm_free@yahoogroups.com <mailto:atm_free%40yahoogroups.com>
> > Cc: atm@; zambutomirrorgroup@yahoogroups.com
> <mailto:zambutomirrorgroup%40yahoogroups.com>
> > Subject: Re: [atm_free] MOM figuring
> >
> >
> >
> >
> >
> > PRETTY COOL, BUT I WONDER ABOUT THE LAP NEVER ROTATING IF THAT IS
> EFFECTING
> > ANYTHING?
> >
> > JOE
> >
> > Error! Filename not specified.
> > The Original Rolling Ball Clock
> > http://www.idle-tyme.com
> >
> >
> >
> > Berthold Hamburger wrote:
> >
> > Hi,
> >
> >
> >
> > I uploaded a new video to Youtube that shows my M-O-M while applying
> > figuring strokes:
> >
> > http://www.youtube.com/watch?v=Vmi3FOs4Zwg
> >
> >
> >
> > Regards
> >
> >
> >
> > Berthold
> >
> > --
> >
> > Berthold Hamburger - Cellist/Spain
> >
> > Email: behambu@
> >
> > http://www.artinso.com
> >
> > http://www.astro.artinso.com
> >
> >
> >
> >
> >
> >
> >
> > _____
> >
> >
> >
> >
> >
> > No virus found in this incoming message.
> > Checked by AVG - www.avg.com
> > Version: 9.0.707 / Virus Database: 270.14.65/2503 - Release Date: 11/14/09
> > 13:42:00
> >
>

Hi Berthold.  It looks like you have about the right ratio of stroke to
turntable speed which is good for figuring but the lap should spin close to the
turntable rate and indicates not perfect contact.  This can be caused by under
pressing the lap and over pressing the lap. It can also be caused by the
channeling of the lap.  When it is perfect it will spin at about 3.5 RPM.

FYI Dave H.

--- In atm_free@yahoogroups.com, "Berthold Hamburger" <b-hamburger@...> wrote:
>
> While the lap has to rotate during polishing, it is not supposed to do so
> during figuring.
>
> Turntable and eccentric speeds are reversed for figuring, so TT turns at 3.5
> rpm while eccentric turns at 20 rpm.
>
>
>
> Berthold
>
>
>
> --
>
> Berthold Hamburger - Cellist/Spain
>
> Email: behambu@...
>
> http://www.artinso.com
>
> http://www.astro.artinso.com
>
>
>
> From: atm_free@yahoogroups.com [mailto:atm_free@yahoogroups.com] On Behalf
> Of Idle-Tyme
> Sent: domingo, 15 de noviembre de 2009 4:14
> To: atm_free@yahoogroups.com
> Cc: atm@...; zambutomirrorgroup@yahoogroups.com
> Subject: Re: [atm_free] MOM figuring
>
>
>
>
>
> PRETTY COOL,  BUT I WONDER ABOUT THE LAP NEVER ROTATING IF THAT IS EFFECTING
> ANYTHING?
>
> JOE
>
> Error! Filename not specified.
> The Original Rolling Ball Clock
> http://www.idle-tyme.com
>
>
>
> Berthold Hamburger wrote:
>
> Hi,
>
>
>
> I uploaded a new video to Youtube that shows my M-O-M while applying
> figuring strokes:
>
> http://www.youtube.com/watch?v=Vmi3FOs4Zwg
>
>
>
> Regards
>
>
>
> Berthold
>
> --
>
> Berthold Hamburger - Cellist/Spain
>
> Email: behambu@...
>
> http://www.artinso.com
>
> http://www.astro.artinso.com
>
>
>
>
>
>
>
>   _____
>
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.707 / Virus Database: 270.14.65/2503 - Release Date: 11/14/09
> 13:42:00
>

The Original Rolling Ball Clock
http://www.idle-tyme.com

Hi,

 

I uploaded a new video to Youtube that shows my M-O-M while applying figuring strokes:

http://www.youtube.com/watch?v=Vmi3FOs4Zwg

 

Regards

 

Berthold

--

Berthold Hamburger - Cellist/Spain

Email: behambu@...

http://www.artinso.com

http://www.astro.artinso.com

 

No virus found in this incoming message.
Checked by AVG - www.avg.com Version: 9.0.707 / Virus Database: 270.14.65/2503 - Release Date: 11/14/09 13:42:00

Richard,

>What if, due to a defect in the light source, the illumination on the
>mirror
>is not uniform... One side is getting more photons than the other?  What
>kind of test can correct for such an error?

  Phase Shifted Interferometry with Bath interferometer aka   "PSI-Bath".

Much simpler, faster and more accurate than Foucault with Couder mask.
Uneven light distribution is non-issue for this method.

Regards
Vladimir.

Wow! Thats a shame.  Would having him give talks to club meetings help?  I have
his book.

brian

--- In atm_free@yahoogroups.com, "Thomas Janstrom" <t_janstrom@...> wrote:
>
> Just an FYI from one of the moderators....
>
> I really think this needs our support, he's one of our own and in need of
> helping hand, the below is a great idea to give him that help.
>
> 'nough said.
>
> Cheers, Thomas Janstrom.
> Little Gems.
> http://tjlittlegems.com
>
>
> -----Original Message-----
> From: atm-bounces@... [mailto:atm-bounces@...] On Behalf Of
> Berthold Hamburger
> Sent: Tuesday, 10 November 2009 6:57 PM
> To: atm@...
> Subject: Re: [ATM] David Harbour
>
> Richard,
>
> I don't know what his revenues are on his publication, but maybe we should
> all buy a copy of his "Understanding Foucault" book?
> http://netzaripress.org/understanding%20foucault.htm
>
> Taking in consideration the number of ATM's on the relevant Yahoo lists +
> European ATM's, I think however small his returns are, it definitely would
> help him. And his book should be on every ATM's bookshelf anyway.
>
> Berthold
>
> --
> Berthold Hamburger - Cellist/Spain
> Email: behambu@...
> http://www.artinso.com
> http://www.astro.artinso.com
>
>
> >
> > This is a great shame and very saddening. Is there anything one could
> > do?
> >
> >
> >
> >
> > > >
> > > > I received a snail mail from Davey today.  He is alive, but in
> > > > constant pain.  He visits the Enid cemetary every day, as if he
> > > > expects to move in there.  He is in great poverty, as he can't eat
> > at
> > > > the soup kitchen any more.  He sleeps with his Glock because of
> > death
> > > > threats.  It does not look good.
> >
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>

Indeed, and I'm the guy who build it. Last issue I'm trying to resolve, as both
Jan and Mel will know, is some micro-slippage in the Altitude bearing [small
nylon wheels and hard-rubber on the sectors]. Any advise is more then welcome.

Martin
--- In atm_free@yahoogroups.com, "Jan van Gastel" <jhm.vangastel@...> wrote:
>
> It is a 12" f/5.3,  with Mel's stepper motor drive system.
> I know the person who built the scope (and the scope).
>
> Jan
> http://members.ziggo.nl/jhm.vangastel/Astronomy/
>
>
>   ----- Original Message -----
>   From: trulyyours05
>   To: atm_free@yahoogroups.com
>   Sent: Wednesday, November 11, 2009 8:23
>   Subject: [atm_free] Re: a new scope comes on line
>
>
>
>   Ah-ha. Let me guess... 18-20" at a little over f4.5??? Nice. Someone is
having fun.
>
>   Al
>

Just an FYI from one of the moderators....

I really think this needs our support, he's one of our own and in need of
helping hand, the below is a great idea to give him that help.

'nough said.

Cheers, Thomas Janstrom.
Little Gems.
http://tjlittlegems.com


-----Original Message-----
From: atm-bounces@... [mailto:atm-bounces@...] On Behalf Of
Berthold Hamburger
Sent: Tuesday, 10 November 2009 6:57 PM
To: atm@...
Subject: Re: [ATM] David Harbour

Richard,

I don't know what his revenues are on his publication, but maybe we should
all buy a copy of his "Understanding Foucault" book?
http://netzaripress.org/understanding%20foucault.htm

Taking in consideration the number of ATM's on the relevant Yahoo lists +
European ATM's, I think however small his returns are, it definitely would
help him. And his book should be on every ATM's bookshelf anyway.

Berthold

--
Berthold Hamburger - Cellist/Spain
Email: behambu@...
http://www.artinso.com
http://www.astro.artinso.com


>
> This is a great shame and very saddening. Is there anything one could
> do?
>
>
>
>
> > >
> > > I received a snail mail from Davey today.  He is alive, but in
> > > constant pain.  He visits the Enid cemetary every day, as if he
> > > expects to move in there.  He is in great poverty, as he can't eat
> at
> > > the soup kitchen any more.  He sleeps with his Glock because of
> death
> > > threats.  It does not look good.
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/

_______________________________________________
ATM mailing list http://www.atmlist.net/

----- Original Message -----

From: trulyyours05

To: atm_free@yahoogroups.com

Sent: Wednesday, November 11, 2009 8:23

Subject: [atm_free] Re: a new scope comes on line

 

Ah-ha. Let me guess... 18-20" at a little over f4.5??? Nice. Someone is having fun.

Al

Ah-ha. Let me guess... 18-20" at a little over f4.5??? Nice. Someone is having
fun.

Al

I see. Texereau was one of those I consider gifts to astronomy.

Thanks, Al

--- In atm_free@yahoogroups.com, "toolontop" <toolontop@...> wrote:
>
> No, he died around '92, according to
http://astro.umsystem.edu/atm/ARCHIVES/OCT97/msg00279.html
>
> Best,
> Mark
>
> --- In atm_free@yahoogroups.com, "trulyyours05" <algermaine@> wrote:
> >
> > Good points. Is Texereau still alive. He would be 90. He was a world class
professional telescope maker. IMHO, his book "How to Make a Telescope" is
required reading.
> >
> > Al
> >
>