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australian electronic gold prospecting forum.com  |  Recent Posts
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 51 
 on: Tuesday February 20 2018 14:21:15 AEDT PM 
Started by Aziz - Last post by 6666
My DE-5000 arrived today  excited

did a couple of quick tests in Auto mode, seems to work, more testing later  smile

 52 
 on: Tuesday February 20 2018 12:05:20 AEDT PM 
Started by Aziz - Last post by Muntari
Hi All,

Here is the basic (very) idea of making your own spiral cutter.
2 Axis motor driven.

Make a simple gantry over platter so ball screw assembly is supported both sides.
You can adjust the ball screw assembly on gantry or platter assembly up and down to obtain required depth.

Its probably more rigid if you move platter as a Z axis assembly rather than the X axis.

What is not shown is the X axis support rail etc

Cheers

Muntari

 53 
 on: Tuesday February 20 2018 10:55:19 AEDT AM 
Started by Doug - Last post by Doug
  
link-https://www.dnrm.qld.gov.au/__data/assets/pdf_file/0007/197647/geology-of-queensland.pdf
doug smile

 54 
 on: Tuesday February 20 2018 10:48:17 AEDT AM 
Started by Aziz - Last post by Muntari
Hi Aziz and 6666,

Yes, both of your ideas will work. You just need some reasonable control over positioning at the wire spacing we are thinking of.
Aziz, I will try the same idea on XPS sheets too.

XPS and Foamed PVC machines very well, just use a 1 or 2 flute end mill as you want to clear the chips from the cut. Too many flutes and you will gum up and snap the bit.
A simple mechanical drive based on a turntable type platter and ball screw would do the trick. The platter holds the material, the ball screw holds tool.
You would drive them with variable speed motors to obtain required pitch, very simple setup.

I will try the creasing wheel idea but instead of heating the sheet of material,  I will heat the wheel with a ceramic heating element as used in 3D printer nozzles

Cheers

Muntari


 55 
 on: Tuesday February 20 2018 00:58:33 AEDT AM 
Started by Aziz - Last post by 6666
I'm thinking along the line of a PCB drill and some sort of router bit

 56 
 on: Tuesday February 20 2018 00:13:52 AEDT AM 
Started by Aziz - Last post by Aziz
Hi Muntari,

you can heat press XPS sheets to make mass production of XPS coil formers. And it is quite cheap.

And it seems, I can even make my own XPS spiral coil formers with soldering iron and a thin steel pin mounted onto it.
Manually by hand of course. But a mechanical tool is requied to make it easier.
 happy face
Cheers,
Aziz

 57 
 on: Monday February 19 2018 23:25:00 AEDT PM 
Started by Aziz - Last post by Muntari
Hi All,

After a long night in the workshop, with CNC cutting away at the large former, I had a bit of time to think of ways to reduce the amount of time it takes to machine these test pieces.

Basically I am going to machine up  a crease wheel similar to this

  
 and heat the Foamed PVC and try and crease the spiral pattern (only has to go 2-3mm in depth) in one pass.
The only gotcha is there will be a minimum diameter I could do this way because of the radius of the wheel but we will see.

Currently with a 1mm endmill, I have to dumb down the feed rate to prevent snapping bits.

I know from my previous tests I can press a 200mm diameter spiral pattern with the heat softened foamed PVC, so I'm hoping I can produce some results this way.

If it works then producing one off formers will be quick and easy, It is a thermo plastic so should work Ok

Lets see if it works  happy face

cheers

Muntari

 58 
 on: Monday February 19 2018 22:04:37 AEDT PM 
Started by Aziz - Last post by Muntari
  
Nice.

Thanks 6666,

Hey, did you get your meter yet?

Cheers

Muntari

 59 
 on: Monday February 19 2018 21:58:20 AEDT PM 
Started by Aziz - Last post by Muntari
  
Love ur work Muntari ..
going into production on these are we    lol

Thanks gef12,

Haha, nah, just force of habit , too many years in electronics design for manufacture and an idle mind  happy face

I'm interested to see how Aziz's theory pans out so just thought I would contribute to the cause..

Mind you, maybe I could do something haha  happy face

Cheers

Muntari

 60 
 on: Monday February 19 2018 16:52:22 AEDT PM 
Started by Aziz - Last post by gef12
Love ur work Muntari ..
going into production on these are we    lol

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