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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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Here what put book in 2015.
It from the hardness tester I have from 1970’s?
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I wrote book before I had 106 Chemotherapy treatments?
 

Chart on different hard scales?
 

Remember the surface being bounced test needs to clean of oil , any coating and Degaussing.
This note is not on drawings
 

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Any charts for ceramic bearings so you don't need to worry about magnetism??

BTW, I did a demo of magnetism with non-magnetic materials.? Dropped a strong magnet through 200cm of 10mm copper tube.? Took a while to fall out the other end, something nobody in the room had seen or expected.

I did include a wave of a Harry Potter magic wand, just for extra effect.

On 05-Mar-25 11:07, davesmith1800 wrote:

Remember the surface being bounced test needs to clean of oil , any coating and Degaussing.
This note is not on drawings
 

You need to make a chart for ceramic bearing balls.
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Blacksmith use for long time.
The machinist hammer ball is used for hardness too.?
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The one purchase in 1970’s the patten was in not losing the ball.?
Check against a Rockwell test it was mark every time .?
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Dave?
 

I know feeling of Harry Potter magic wand and dropping ball.
Back in 1970’s when first purchased it I would be ok for cast iron wheels and if work i would be happy.
I was very surprised how well it worked on everything
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Dave
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On Wed, Mar 5, 2025 at 12:11 AM, Jerry Durand wrote:

Any charts for ceramic bearings so you don't need to worry about magnetism??

BTW, I did a demo of magnetism with non-magnetic materials.? Dropped a strong magnet through 200cm of 10mm copper tube.? Took a while to fall out the other end, something nobody in the room had seen or expected.

I did include a wave of a Harry Potter magic wand, just for extra effect.

On 05-Mar-25 11:07, davesmith1800 wrote:
Remember the surface being bounced test needs to clean of oil , any coating and Degaussing.
This note is not on drawings
 

Should figure out how to measure the induced voltage. Would be a cool addition to the demonstration.?

Bill in OKC?

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Wednesday, March 5, 2025 at 02:11:43 AM CST, Jerry Durand via groups.io <jdurand@...> wrote:


Any charts for ceramic bearings so you don't need to worry about magnetism??

BTW, I did a demo of magnetism with non-magnetic materials.? Dropped a strong magnet through 200cm of 10mm copper tube.? Took a while to fall out the other end, something nobody in the room had seen or expected.

I did include a wave of a Harry Potter magic wand, just for extra effect.

On 05-Mar-25 11:07, davesmith1800 wrote:
Remember the surface being bounced test needs to clean of oil , any coating and Degaussing.
This note is not on drawings
 

开云体育

Voltage would be pretty low, but I'll bet the current is pretty good.

200mm long pipe, not cm.

On 06-Mar-25 18:34, Bill in OKC too via groups.io wrote:

Should figure out how to measure the induced voltage. Would be a cool addition to the demonstration.?

Bill in OKC?
 

Sounds great too?
It will work too.?
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It bouns that makes work to a senceres like you said a mini metal detector and time.?
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When purchased the first I play around with aluminum
Found about 18"? drop I could read reading of hardness of different aluminum. I had no real use as work in steel and iron. I also did have a way market the tester.?
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Like your ? idea
Dave?
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On Thu, Mar 6, 2025 at 07:34 AM, Bill in OKC too wrote:

Should figure out how to measure the induced voltage. Would be a cool addition to the demonstration.?
?
Bill in OKC?
?
William R. Meyers, MSgt, USAF(Ret.)
?
Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.
?
?
On Wednesday, March 5, 2025 at 02:11:43 AM CST, Jerry Durand via groups.io <jdurand@...> wrote:
?
?
Any charts for ceramic bearings so you don't need to worry about magnetism??

BTW, I did a demo of magnetism with non-magnetic materials.? Dropped a strong magnet through 200cm of 10mm copper tube.? Took a while to fall out the other end, something nobody in the room had seen or expected.

I did include a wave of a Harry Potter magic wand, just for extra effect.

On 05-Mar-25 11:07, davesmith1800 wrote:
Remember the surface being bounced test needs to clean of oil , any coating and Degaussing.
This note is not on drawings
?

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