¿ªÔÆÌåÓý

  1. 7x12MiniLathe
  2. Messages
Expanded Topics Messages
Date
Re: detection of alluminium

 

I assume by from a picnic table you mean it is a frame or part of a frame. If it looks like a cast part, then if it is magnetic, it is not aluminum. If it isn't magnetic, it could be aluminum or magnesium. Aluminum is 2.7gm/cm^3 and magnesium is 1.74 gm/cm^3, so if you can weight it and measure the volume (Archimedes), you can figure out which one it is.

you can also check out searching for "test aluminum versus magnesium"

Here is one example



On Tue, Sep 24, 2024 at 6:05?AM Jacques Savard via <jacquessavard=[email protected]> wrote:
?
I have? some? metal? from? picnic table? whit glass?
2 interrogation
A? howto? verify? it is alluminium? ?maybe? magnnetic? ok? but? do you have? any other? method? like? acid? vinegar? or so
B? ?is it possible to? make a check? playing? dising? whit? sand blasst? on? these? kind? of? tenpered glass table? or? no? everything? exploded
?
jack 47 71
?


--
Buffalo John
Re: detection of alluminium

 

Not sure if it is a shape you could figure out its volume. If it is you could weigh it and see if that is the correct for that volume of material. Paul M
detection of alluminium

 

?
I have? some? metal? from? picnic table? whit glass?
2 interrogation
A? howto? verify? it is alluminium? ?maybe? magnnetic? ok? but? do you have? any other? method? like? acid? vinegar? or so
B? ?is it possible to? make a check? playing? dising? whit? sand blasst? on? these? kind? of? tenpered glass table? or? no? everything? exploded
?
jack 47 71
?
Re: Brazing (was: Re: Large work holding)

 


I? verify? on? the? box

it is? mark? 50? amp

it? look to me? a bit? to hight? but? that? is? 500w? around?

the ok

jack 47 71


nb? the first? messge? said? server? was? bad? configured ??
Re: Large work holding

 

It's not just the lower melting temperature; the cadmium makes the liquid flow better.
?
Roy
Re: Turning Brass on 7x16?

 

Good find! The picture is better than my text ;-)
?
Roy
Re: Brazing

 

¿ªÔÆÌåÓý

??? interesting , whats the power source ?

??? thanks

animal

On 9/22/24 8:01 AM, Jacques Savard wrote:


here? the photo? of? my? special? carbone welder

the black part? are? insulated? ?and? the 2 part? can be? move? to? touch or? a bit? distenced for? plasma? building

jack 47 71


Attachments:
Re: Brazing (was: Re: Large work holding)

 

¿ªÔÆÌåÓý

I used sil-phos in refrigeration. Doesn't need flux, prepping is minimal, stands up to relatively high pressures; Needs higher temps though.
Re: Brazing (was: Re: Large work holding)

 


here? the photo? of? my? special? carbone welder

the black part? are? insulated? ?and? the 2 part? can be? move? to? touch or? a bit? distenced for? plasma? building

jack 47 71


20240922_103757[1].jpg
20240922_103737[1].jpg
20240922_103733[1].jpg

Re: Turning Brass on 7x16?

 

I've turned brass fitting many times on the LMS 5100.? ?Never went to specific bit geometries - just used the indexable carbides from low-priced sets or other chinese turning tools.
--
Lone Tree, Colorado? ?USA
Re: Large work holding

 

I ALWAYS use cadmium-bearing alloys because of their lower melting temperature. I keep a window open in my basement shop and a fan blowing from one side? so any fumes get diluted and blown away from me.? I'm still vertical. So far.

Mike Taglieri?


On Sat, Sep 21, 2024, 7:15 PM Roy via <roylowenthal=[email protected]> wrote:
The 95/5 alloy is the nicest Pb free plumbing solder! I still miss the Cd containing brazing alloys for their ease of use; that's with my head - the rest of the innards are happier not being exposed to it.
?
Roy
Re: Turning Brass on 7x16?

 

It might not be clear to everybody what "stoning a tiny flat" really means.? This is called "dubbing" a drill and here is a pretty good photo I found online.

It isn't really a less sharp edge (you still want a very sharp edge), but one with zero rake angle.? This prevents the drill from corkscrewing in with soft metals or plastics.? It is a VERY handy little trick.? As another bonus, it is safer when drilling soft materials because it is far less likely the drill will "grab" into the material as a sudden surprise.

Inline image

Charles E. "Chuck" Kinzer
On Saturday, September 21, 2024 at 04:21:52 PM PDT, Roy via groups.io <roylowenthal@...> wrote:


The main things are no top rake & stoning a tiny flat (instead of a sharp edge) on drill bits.? Those sharpening differences keep the tool from pulling itself into the work.
?
Roy
Re: Turning Brass on 7x16?

 

The main things are no top rake & stoning a tiny flat (instead of a sharp edge) on drill bits.? Those sharpening differences keep the tool from pulling itself into the work.
?
Roy
Re: Large work holding

 

The 95/5 alloy is the nicest Pb free plumbing solder! I still miss the Cd containing brazing alloys for their ease of use; that's with my head - the rest of the innards are happier not being exposed to it.
?
Roy
Re: Large work holding

 

I try to avoid the phrase "silver solder" nowadays because people use it to mean two entirety different things: silver brazing alloys and soft solder that's 5% silver and 95% tin. The latter is just one of the many lead-free soldiers used in plumbing now, but manufacturers love to call it "silver solder" on the package because it sounds so elegant and fancy.??

So now I always say "silver brazing alloy" or "5% silver solder."? ?No point in confusing people.

Mike Taglieri?


On Sat, Sep 21, 2024, 9:28 AM terry.moore50 via <terryimoore=[email protected]> wrote:
Don¡¯t forget silver soldering. A number of model boilers are sealed using easy flow flux with silver solder. You can¡¯t mix it with soft solder though! Any old soft solder residue has to be completely removed which is not easily accomplished. Terry UK.
Re: Turning Brass on 7x16?

 

I turn brass all of the time on my mini lathe.
Use high-speed steel tool bits.
High-speed steel can be sharpened better than carbide tools.
This is a mini lathe, so cutting speed is not too critical.
Regards,
John Mattis (retired mechanical engineer)

On Sat, Sep 21, 2024 at 5:46?AM CBJessee-N4SRN via <cbjesseeNH=[email protected]> wrote:
I made a 5in brass cannon from 1.25" C360 brass on a big Southbend lathe at my local Markerspace and plan to try it again on my LMS 7x16. What tooling and speeds are recommended?
Re: Turning Brass on 7x16?

 

C360 turns nice with flat on top HSS on the 7x in my experience. Really sharp with a tiny nose radius worked great for me. I turned almost 50 feet of 3/8" into little 1/2" long orifices and never found anything that cut as well as flat HSS. It did not like carbide or any top rake on the steel in my experience. I spun it around 8 to 900 rpm and fed .002" per rev and got a really nice surface finish.?

Ryan
On Sep 21, 2024 at 8:46?AM -0400, CBJessee-N4SRN via groups.io <cbjesseenh@...>, wrote:

I made a 5in brass cannon from 1.25" C360 brass on a big Southbend lathe at my local Markerspace and plan to try it again on my LMS 7x16. What tooling and speeds are recommended?
Re: Brazing (was: Re: Large work holding)

 

Mike,
Yes, a welder can provide the juice. I have a carbon arc torch (cheap one) that I've used quite a bit with my AC arc welder. Gives you a lot more heat than gas torches.
Roger Cardon
Re: Large work holding

 

Don¡¯t forget silver soldering. A number of model boilers are sealed using easy flow flux with silver solder. You can¡¯t mix it with soft solder though! Any old soft solder residue has to be completely removed which is not easily accomplished. Terry UK.
Turning Brass on 7x16?

 

I made a 5in brass cannon from 1.25" C360 brass on a big Southbend lathe at my local Markerspace and plan to try it again on my LMS 7x16. What tooling and speeds are recommended?
501 - 520 of 120319