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Impressive tools people come up with

Impressive tools people come up with

Far Canal
3 years ago

Quoting Hoodeng on 01 Aug 2021 09:02 AM
I am thinking the rulers are used where material gain is encountered, if you mark out a flat sheet of material and then fold it, you gain in the bends as the material bends on a surface not on a center line of the material. Bit like a tube bender that has gain calculated into the degrees when bending.
As to the scales ???.

Quoting Far Canal on 01 Aug 2021 09:35 AM
You are very close Hoodeng.
The rules are actually for where material loss is encountered.
They are very obscure, from a certain engineering trade that I stumbled into as a lad.

Quoting Wideglider on 01 Aug 2021 12:02 PMedited: 01 Aug 2021 12:10 PM
Very good, I learn something everyday.
So it's seems the pattern makers pretend a measurement is not really what it is, so then adjust it to suit their particular needs - not an engineering rule!
Rather than measuring and then applying a correction factor, make a fake rule.
Pattern-makers - carpets, curtains, cushions?

It is true Wideglider there is an occupation called Pattern-maker that has something to do with making clothes etc.

However an Engineering Patternmaker makes patterns usually out of timber. These patterns are used to make sand molds. The patterns are taken out of the molds and into the molds molten metal is poured to make a metal casting. That is how they make all sorts of metal items like engine blocks, pistons, cylinder/blocks, propellers for ships, pipes etc etc etc. Because different metals shrink different amounts from molten to solid you make the patterns using these contraction rules to allow for the shrinkage so that the final casting ends up the correct size.

Grease Monkey and fatbat like this post

keith
3 years ago

Years ago prior to many now used computer programs , these rulers were common in the mining industry used Geologists, engineers, and mine planners etc. Easy tool required for map reading. Still one have tucked away.

Hoodeng
3 years ago

I did the divisions of 1/50th and 1/60th into an inch and came up with 2% and 1.5% and could not make it work with gain in bends as that percentage of cross section is higher. But with what we know now those percentages are the shrinkage of metals in castings. Cast aluminium is 2% smaller than the mold and steel/iron is 1.5%.
Many years ago i did molds off a set of Hurricane triple clamps that were prone to cracking, the foundry informed me at the time that my finished parts would be 2% smaller than the original castings that i used. They turned out ok.

Cheers.

fatbat
3 years ago

Quoting Far Canal on 01 Aug 2021 09:35 AM
You are very close Hoodeng.
The rules are actually for where material loss is encountered.
They are very obscure, from a certain engineering trade that I stumbled into as a lad.

Quoting Wideglider on 01 Aug 2021 12:02 PMedited: 01 Aug 2021 12:10 PM
Very good, I learn something everyday.
So it's seems the pattern makers pretend a measurement is not really what it is, so then adjust it to suit their particular needs - not an engineering rule!
Rather than measuring and then applying a correction factor, make a fake rule.
Pattern-makers - carpets, curtains, cushions?

Quoting Far Canal on 01 Aug 2021 11:32 PM
It is true Wideglider there is an occupation called Pattern-maker that has something to do with making clothes etc.

However an Engineering Patternmaker makes patterns usually out of timber. These patterns are used to make sand molds. The patterns are taken out of the molds and into the molds molten metal is poured to make a metal casting. That is how they make all sorts of metal items like engine blocks, pistons, cylinder/blocks, propellers for ships, pipes etc etc etc. Because different metals shrink different amounts from molten to solid you make the patterns using these contraction rules to allow for the shrinkage so that the final casting ends up the correct size.

bloodog
3 years ago

this guy is a fucken tool

steelo
3 years ago

Far Canal
3 years ago

Any chance of a few pics of the lense, or what ever the round bit is Steelo?.

Ratbob
3 years ago

Quoting steelo on 02 Aug 2021 12:12 PM

Those stylus brush/inspection tools are worth a bit now Steelo.
Have you got the Discwasher brush, liquid, and Antistat gun to go with it?

steelo
3 years ago

Thanks for q fc. Well guessed rb. It is indeed a stylus inspection / cleaning tool. Mirror is concave to magnify. Soft bristles on the back side.
Has a clothes lint style brush and fluid for cleaning records.

Far Canal
3 years ago

Steelo, that brush? item in the second picture is something else. Is it hollow so that the other bit with a mirror fits into it?

steelo
3 years ago

Thanks for interest fc. The brush handle is made out of a solid piece of walnut with a void to put the fluid bottle into. Fits into little box better. I’ve had it for about 40 years. Based on what rb said, I looked online and sadly they're not that expensive second hand with postage being more than the product.

Ratbob
3 years ago

Here’s the whole kit, sold it recently for about $200. Sold instantly too on StereoNet.

steelo likes this post

Far Canal
3 years ago

Quoting Ratbob on 03 Aug 2021 07:51 AM
Here’s the whole kit, sold it recently for about $200. Sold instantly too on StereoNet.

Not surprised it sold instantly really. No one these days would make a brush with a hollow handle like that in walnut!.

steelo
3 years ago

How come FC? The wood doesn't do a lot of work and there's not much pressure. The brush just removes lint and dust from LP surfaces

Far Canal
3 years ago

Try and make a hollow handle like that. There is a lot of mucking around to do it. And you are right, the wood does not do anything except look, and feel good. Things have changed a lot since that little kit was made.

Ratbob
3 years ago

Quoting Far Canal on 01 Aug 2021 09:35 AM
You are very close Hoodeng.
The rules are actually for where material loss is encountered.
They are very obscure, from a certain engineering trade that I stumbled into as a lad.

Quoting Wideglider on 01 Aug 2021 12:02 PMedited: 01 Aug 2021 12:10 PM
Very good, I learn something everyday.
So it's seems the pattern makers pretend a measurement is not really what it is, so then adjust it to suit their particular needs - not an engineering rule!
Rather than measuring and then applying a correction factor, make a fake rule.
Pattern-makers - carpets, curtains, cushions?

Quoting Far Canal on 01 Aug 2021 11:32 PM
It is true Wideglider there is an occupation called Pattern-maker that has something to do with making clothes etc.

However an Engineering Patternmaker makes patterns usually out of timber. These patterns are used to make sand molds. The patterns are taken out of the molds and into the molds molten metal is poured to make a metal casting. That is how they make all sorts of metal items like engine blocks, pistons, cylinder/blocks, propellers for ships, pipes etc etc etc. Because different metals shrink different amounts from molten to solid you make the patterns using these contraction rules to allow for the shrinkage so that the final casting ends up the correct size.

Yeah FC, I’ve been reading a book, Rare Trades, which includes Pattern Making and I was surprised by the shrinkage rates. Imagine factoring in the shrinkage for something complex like the Rolls Royce Merlin engine in the Spitfires or even the first 1969 Sandcast CB750. Very clever.
All computerised now.

Humbug likes this post

Ratbob
3 years ago

Quoting Hoodeng on 02 Aug 2021 01:27 AM
I did the divisions of 1/50th and 1/60th into an inch and came up with 2% and 1.5% and could not make it work with gain in bends as that percentage of cross section is higher. But with what we know now those percentages are the shrinkage of metals in castings. Cast aluminium is 2% smaller than the mold and steel/iron is 1.5%.
Many years ago i did molds off a set of Hurricane triple clamps that were prone to cracking, the foundry informed me at the time that my finished parts would be 2% smaller than the original castings that i used. They turned out ok.

Cheers.

Bloody impressive Hoody.

bloodog
3 years ago

steelo
3 years ago

Veerrry Interesting BD!!

Edit: Half / part of a gravity die cast mold?

Far Canal
3 years ago

Nice vernier calipers Bloo.
What is that thing behind them?

steelo likes this post

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