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Hardness tesrters

 
Edited

Here pass from 1970’s patten too.
A ball drop
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Today's hardness tester?
A ball drop notice the size?
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[COLOR="#800000"][b] [CENTER]???? ? ??? [/CENTER].? ?[/B][/COLOR]?
This side I use on I purchased in the mid 1970’s I have posted this side only? since 1999. one first got the Kro printer for drafting in 1979 I hardness for ?" plate since most die work using ?" stickand only side showed?
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============= other brand =============
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This today's $279.00 you buy new 2025
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=====The day I purchasedin mid 1970’s====
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This is how came brand new in mid 1970’s.?
The above is side post since 1999 on groups.
They used Millimeter in the mid 1970’s?
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WHAT I SAY IS Hight lite to see answer?
?COPY CAT?
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WHAT DO YOU THINK??
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Re: On the Funny Side

 

Re: On the Funny Side

 

Lucky dog
  1. Warm teepee?
  2. Scrape?
  3. Only do guard duty while sleeping?
  4. Health care?
  5. Bed?
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Dave?
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Re: On the Funny Side

 

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Re: Magnetic North vs True North

 

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It's hard to find current data, but the movement of the poles has been speeding up.? You can see it some from 1980 to 2015 but it's moved quite a bit in 10 years.? The south pole is headed for the Indian Ocean.? Also the strength has been dropping which can cause instability in a compass.

Getting current data is again not easy.? Some sources have the rate of decrease accelerating past this chart.




On 28-Feb-25 7:49, davesmith1800 wrote:

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Here little data on magnetic north vs true north.?
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Re: Magnetic North vs True North

 
Edited

Here a web site show the magnetic north vs true north.? The compass part may work if you have the magnetic senor?
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Dave?
Magnetic North vs True North

 

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Here little data on magnetic north vs true north.?
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Re: Sextant design & build

 

Here chart on miles vs degrees?
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Re: Sextant design & build

 

Here is small version? 4" x 4" [100mm x 100mm] if note the find adj? had removed.
It could be more work to get down to 3" x 3"?
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Dave?
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1A_ SEXTANTSmaller ver.pdf
1A_ SEXTANTSmaller ver.pdf

Re: On the Funny Side

 

Re: My project thread

 

Looks great?
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Dave?
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On Thu, Feb 27, 2025 at 02:14 PM, Nitro wrote:

Mini alternator kits for nostalgia drag racing.
There are three different kits available, one which caters to the small block Chevrolet crowd, one for the 348/409 racers and of course the Mark IV Chevy big block series.
What these offered was a relocation to the original power steering location, a deep grooved pulley on the alternator and a 65 amp alternator that weighs in at about half the weight of the 35 amp AC Delco units.
The smaller size of the one wire Denso alternators allows them to fit where the steering pumps used to reside.
My kits eliminate the flimsy stamped bracketry in favor of substantial 3/8ths inch 6061 T6 ones too.
Each kit was delivered with a hardware package, so all that was necessary was the install and a one wire hookup to use them.
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I also provided a deep grooved? 5 inch diameter crankshaft in the kits that slows the alternators down.
That gives you back a little of the power lost from winding one up.
The smaller unit saves space, withstands higher revs better and has about twice the output of the AC Delco units.
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Re: On the Funny Side

 

Re: My project thread

 

Mini alternator kits for nostalgia drag racing.
There are three different kits available, one which caters to the small block Chevrolet crowd, one for the 348/409 racers and of course the Mark IV Chevy big block series.
What these offered was a relocation to the original power steering location, a deep grooved pulley on the alternator and a 65 amp alternator that weighs in at about half the weight of the 35 amp AC Delco units.
The smaller size of the one wire Denso alternators allows them to fit where the steering pumps used to reside.
My kits eliminate the flimsy stamped bracketry in favor of substantial 3/8ths inch 6061 T6 ones too.
Each kit was delivered with a hardware package, so all that was necessary was the install and a one wire hookup to use them.
?
I also provided a deep grooved? 5 inch diameter crankshaft in the kits that slows the alternators down.
That gives you back a little of the power lost from winding one up.
The smaller unit saves space, withstands higher revs better and has about twice the output of the AC Delco units.
?
?
?
?
?
Re: mini spot welder

 

Sounds great?
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Dave?
Re: mini spot welder

 

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The welder cost under $20 USD and we had already bought it for battery packs.

Looks like batches of a dozen at a time, don't know how many.? First batch is out for market test.



On 27-Feb-25 20:55, davesmith1800 wrote:

That tuff one main reason is keeping the cost down.?
They make good equipment for this work but all cost money.?
It sounds like for advertising. I do not know the number you need ,look at soldering for a low production number.?
For larger number look for company that does for advertising.?
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Very thin is very difficult with its own problems.? Heavy has very different problems that what did most life.?
Thin was just hobby in one's and two's and level is different set of problems.? This one I a roll of very strong silver well solder bandsaw? blades and a low temperature silver solder. Both Great for a few parts.
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How many do you need to make?
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Dave?
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On Thu, Feb 27, 2025 at 09:28 AM, Jerry Durand wrote:
It's a bunch of clips that hold paper.

this thickness is close to the range of battery packs, only for batteries it's nickel to stainless.? The nickel comes in 0.1mm, 0.12mm, 0.15mm, and 0.2mm.

On 27-Feb-25 20:18, davesmith1800 wrote:
That is 0.012"?
Very hard to weld . The only way I ever did was silver solder to avoid buying the correct equipment found in electronic industry. I was in heavy steel.?
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What are you building??
?
Dave?
Re: mini spot welder

 

That tuff one main reason is keeping the cost down.?
They make good equipment for this work but all cost money.?
It sounds like for advertising. I do not know the number you need ,look at soldering for a low production number.?
For larger number look for company that does for advertising.?
?
Very thin is very difficult with its own problems.? Heavy has very different problems that what did most life.?
Thin was just hobby in one's and two's and level is different set of problems.? This one I a roll of very strong silver well solder bandsaw? blades and a low temperature silver solder. Both Great for a few parts.
?
How many do you need to make?
?
Dave?
?
On Thu, Feb 27, 2025 at 09:28 AM, Jerry Durand wrote:

It's a bunch of clips that hold paper.

this thickness is close to the range of battery packs, only for batteries it's nickel to stainless.? The nickel comes in 0.1mm, 0.12mm, 0.15mm, and 0.2mm.

On 27-Feb-25 20:18, davesmith1800 wrote:
That is 0.012"?
Very hard to weld . The only way I ever did was silver solder to avoid buying the correct equipment found in electronic industry. I was in heavy steel.?
?
What are you building??
?
Dave?
Re: mini spot welder

 

开云体育

It's a bunch of clips that hold paper.

this thickness is close to the range of battery packs, only for batteries it's nickel to stainless.? The nickel comes in 0.1mm, 0.12mm, 0.15mm, and 0.2mm.

On 27-Feb-25 20:18, davesmith1800 wrote:

That is 0.012"?
Very hard to weld . The only way I ever did was silver solder to avoid buying the correct equipment found in electronic industry. I was in heavy steel.?
?
What are you building??
?
Dave?
Re: mini spot welder

 

That is 0.012"?
Very hard to weld . The only way I ever did was silver solder to avoid buying the correct equipment found in electronic industry. I was in heavy steel.?
?
What are you building??
?
Dave?
Re: mini spot welder

 

开云体育

0.3mm

On 27-Feb-25 20:07, davesmith1800 wrote:

2mm is rod size opps?
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What gauge is metal ?
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Dave?
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Re: mini spot welder

 

2mm is rod size opps?
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What gauge is metal ?
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Dave?
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