northwest Recent Posts
Welcome, Guest. Please login or register.
Saturday February 24 2018 23:08:09 AEDT PM
Home Help Login Register
News: Welcome to the Australianelectronicgoldprospectingforum founded in July 2010, an add free totally independent forum with over 70 boards and paid for and managed by the Admin.Total forum Topics: 8,946   Total forum Posts:43,065 Members:708 Total page views:10,002,638  Admin and  forum and domain name owner :marjen at optusnet.com.au. Guests can only see a limited number of boards at present and cannot see any hot links. Guest cannot post and never will be permitted too!Registration of new members must be approved by admin.Anyone known to have any past or present association with Codan/ML or acting on their behalf as a proxy or intermediary  will not have their registration approved. All  original Photos and posts and  original materials displayed on this site are COPYRIGHTED and remain the property of the poster and the  Austalian electronicgoldprospectingforum.com. All messages on this forum express the personal views of the author and should not be interpreted as necessarily being in accord with those of the forum owner and neither the owner of this forum and its domain name nor SMF or the forum software developers or the forum host shall be held responsible for the content of any message. Admin reserves the right to remove any offensive or objectionable posts. No defamatory material or politics/religion or issues of race will be permitted.
HOT Topics!
The need for big deep gold detectors.
link-http://australianelectronicgoldprospectingforum.com/detector-coils/the-need-for-big-deep-gold-detectors/msg44569/?topicseen#msg44569
QED on the beaches
link-http://australianelectronicgoldprospectingforum.com/new-board-109/qed-on-the-beaches/msg44567/?topicseen#msg44567
More B/S from the idiot climate denier Inhere on Finders! 
link-http://australianelectronicgoldprospectingforum.com/climate-change/more-bs-from-the-idiot-climate-denier-inhere-on-finders!/msg44571/?topicseen#msg44571

australian electronic gold prospecting forum.com  |  Recent Posts
Pages: 1 2 3 4 5 6 [7] 8 9 10

 61 
 on: Monday February 19 2018 16:33:21 AEDT PM 
Started by Aziz - Last post by Muntari
Hi Autitch,

Just had a good look at those coils and can see what you are saying.
I'll work on that with a similar solution, thanks again

Cheers

Muntari

 62 
 on: Monday February 19 2018 16:13:08 AEDT PM 
Started by Aziz - Last post by Muntari
  
Nice work Muntari.
The 18” coil size will be a killer.  Just an observation or two.   You may want to look to reduce the stress raiser at the mounting shaft clevis outside corners.  This is an area of especially high stresses especially as the coil increase in size.  I have seen quite a number of coil housing failures due to poor transition in this area.  As inspiration the NF clevis mount is very robust but necessitates an injection moulded component (could be 3D printed).  For a vacuumed formed arrangement  I like the way Coiltek do this detail on the 14” round coils and by contrast the way they do it on the 14x9 is terrible, a real recipe for cracks which from all reports they have had a few.
The location of the cable entry may not be optimal as the cable path is appears to be slightly obscured to be able to go down the arm.
AuTitch


Hi Autitch,

Thanks for your comments and observations.

Yes, it is not optimal for sure, and good point on the corner stresses, I would normally spread the load radially and have a broader sweep so there is enough cavity to fill with epoxy. I haven't done the stress analysis on it yet and something I will do.
Thanks for the heads up on Coiltek and NF housings, I deliberately avoid looking at other products when doing a first draft  design and then take a peek to see where it can be improved, old habits  happy face

Again, great input, its always good to get feedback, I appreciate it.

I've got to go into workshop tonight and machine that 18" former which will take 3.5hours.

When the design is finalised, I will make an aluminium tool piece with inverted pattern of former.
I did some tests with the 200mm Foamed PVC former and found I can heat soften the material and then press a 2mm deep x 1mm spiral pattern into it quite easily.

If this works on a larger scale (18+") then it will be happy days.

Cheers

Muntari

 63 
 on: Monday February 19 2018 15:44:01 AEDT PM 
Started by Aziz - Last post by autitch
Nice work Muntari.
The 18” coil size will be a killer.  Just an observation or two.   You may want to look to reduce the stress raiser at the mounting shaft clevis outside corners.  This is an area of especially high stresses especially as the coil increase in size.  I have seen quite a number of coil housing failures due to poor transition in this area.  As inspiration the NF clevis mount is very robust but necessitates an injection moulded component (could be 3D printed).  For a vacuumed formed arrangement  I like the way Coiltek do this detail on the 14” round coils and by contrast the way they do it on the 14x9 is terrible, a real recipe for cracks which from all reports they have had a few.
The location of the cable entry may not be optimal as the cable path is appears to be slightly obscured to be able to go down the arm.
AuTitch

 64 
 on: Monday February 19 2018 15:26:11 AEDT PM 
Started by Aziz - Last post by 6666
Nice.

 65 
 on: Monday February 19 2018 14:49:41 AEDT PM 
Started by Aziz - Last post by Muntari
Hi All,

This is a draft of the 18 inch mono housing which will be machined from laminated Foamed PVC then eventually vacuum molded.

The TX/RX variant will be a modified version of this with slightly larger diameter housing.

Cheers

Muntari

 66 
 on: Monday February 19 2018 13:48:07 AEDT PM 
Started by Doug - Last post by Doug
Kalgoorlie gold
  
doug smile

 67 
 on: Monday February 19 2018 13:40:55 AEDT PM 
Started by Doug - Last post by Doug
Cervantes Re-Invigorates a West Australian Gold Field
  
link-http://www.cervantescorp.com.au/pdfs/2017-06-15-082723170615_-_Cervantes_Announcement.pdf
doug smile

 68 
 on: Monday February 19 2018 13:37:58 AEDT PM 
Started by Doug - Last post by Doug
Climate-change–driven accelerated sea-level rise detected in the altimeter era
R. S. Nerema,1, B. D. Beckleyb, J. T. Fasulloc, B. D. Hamlingtond, D. Mastersa, and G. T. Mitchume
aColorado Center for Astrodynamics Research, Ann and H. J. Smead Aerospace Engineering Sciences, Cooperative Institute for Research in Environmental
Sciences, University of Colorado, Boulder, CO 80309; bStinger Ghaffarian Technologies Inc., NASA Goddard Space Flight Center, Greenbelt, MD 20771;
cNational Center for Atmospheric Research, Boulder, CO 80305; dOld Dominion University, Norfolk, VA 23529; and eCollege of Marine Science, University of
South Florida, St. Petersburg, FL 33701
Edited by Anny Cazenave, Centre National d’Etudes Spatiales, Toulouse, France, and approved January 9, 2018 (received for review October 2, 2017)

Using a 25-y time series of precision satellite altimeter data from
TOPEX/Poseidon, Jason-1, Jason-2, and Jason-3, we estimate the
climate-change–driven acceleration of global mean sea level over
the last 25 y to be 0.084 ± 0.025 mm/y2. Coupled with the average
climate-change–driven rate of sea level rise over these same 25 y of
2.9 mm/y, simple extrapolation of the quadratic implies global mean
sea level could rise 65 ± 12 cm by 2100 compared with 2005, roughly
in agreement with the Intergovernmental Panel on Climate Change
(IPCC) 5th Assessment Report (AR5) model projections.

  
link-http://www.pnas.org/content/pnas/early/2018/02/06/1717312115.full.pdf
doug smile

 69 
 on: Monday February 19 2018 13:30:03 AEDT PM 
Started by Doug - Last post by Doug
  
link-http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.914.1460&rep=rep1&type=pdf
doug smile

 70 
 on: Monday February 19 2018 12:43:49 AEDT PM 
Started by Doug - Last post by Doug
Ballarat East
  
link-http://www.portergeo.com.au/database/mineinfo.asp?mineid=mn787
doug smile

Pages: 1 2 3 4 5 6 [7] 8 9 10
australian electronic gold prospecting forum.com  |  Recent Posts


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2006-2009, Simple Machines
Simple Audio Video Embedder

BisdakworldClassic design by JV PACO-IN
Valid XHTML 1.0! Valid CSS!