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Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?
Yes, the metrification of plywood drives me nuts!? At least the other dimensions are correct.? Another change is the length and width of 5mm (3/16") luan; it used to be exactly 4x8', but now I always check because sometimes it's accurate, most of the time it's about 1/8-3/16" too long, and sometimes both length and width are too big.? I think it depends on the country of origin.? -Dave
On Friday, September 15, 2023 at 11:07:47 AM PDT, pat goodyear <pgoodyear@...> wrote:
So now that you mention it a 4x8 sheet of plywood from the local Home Depot is not 3/4" thick it is 19mm which really screws up projects when you come out off a 32 or 64.? Pain in the Axx if you ask me.? ? I have engineering rulers graduated in 10ths, 12ths, 16ths, 32nds, and in metric also they have scales that adjust to divisions or multiples thereof.? I bought them years ago for scaling projects to size..? ?They come in quite handy when I need them.? ? pat |
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Re: Off Topic measuring units
A tum is the thumb width.? What part of the thumb I'm not sure.? I always assumed the knuckle, but mine would be 1.15 tums without pressing against the scale.? The width at the base of the thumb nail is right on, but of course, everyone is different! -Dave
On Friday, September 15, 2023 at 11:07:01 AM PDT, Peter Brooks <peter@...> wrote:
Isn’t an inch supposed to be one division (section) on the thumb? Might be the same origin.
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Re: Older Unimat PC power supply Solved!
开云体育I figured it out!?? After dismantling the electrical components, it appears that the Off switch was actually stuck down, i.e., not popping back up.? I got some contact spray into in and the unit is running once again. ? ? Ron L ? From: Ron L"Herault <lherault@...>
Sent: Wednesday, September 13, 2023 10:38 AM To: '[email protected]' <[email protected]> Subject: Older Unimat PC power supply ? Hi Folks! ? I have an older Unimat PC (so it says on its tag) which just stopped. Fuse is good, motor spins, no smell, and I did not let any smoke out.? Can anyone point me in the right direction to fix it??? Might the capacitor have died?? Transformer was warm but not exceedingly hot. ? Thanks! ? Ron L in exceedingly damp North Attleboro, MA |
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Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?
So now that you mention it a 4x8 sheet of plywood from the local Home Depot is not 3/4" thick it is 19mm which really screws up projects when you come out off a 32 or 64.? Pain in the Axx if you ask me.? ? I have engineering rulers graduated in 10ths, 12ths, 16ths, 32nds, and in metric also they have scales that adjust to divisions or multiples thereof.? I bought them years ago for scaling projects to size..? ?They come in quite handy when I need them.? ?
pat |
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Re: What is the 'BEST' Unimat ?
Jerry; you popped a memory bubble.? ?Back in Naval Nuclear Power School (1974) in order to grasp unit conversions, we had all sorts of goofy conversions to do.? One was to convert furlongs per fortnight to inches per second, to mm per second .....? ?As? some of our calculations dealing with forces inside a reactor at power could be mind numbing.? ? Anyhow thanks for the blast from the past.? ?
Pat |
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Re: Off Topic measuring units
Perhaps a "thumb" is a digit (1/24 of a cubit). [:-) Martin P.
On Friday, September 15, 2023 at 01:29:23 PM EDT, Dave Seiter <d.seiter@...> wrote:
I have a ~4" vernier caliper from the around the time Sweden was changing their measuring system around 1875. Three of the scales I've ID'd, but one is really odd- the unit size is about 1.6".? One of the scales is "tums", (thumbs), which were about .97". -Dave |
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Re: Off Topic measuring units
There are subtle differences I think between some US and UK measurements I think, fluids I think? I never liked fluid ounces etc, I’ll stick to pints, quarts and gallons (and of course gills and jacks).
The yard (three feet) is meant to be the length between the nose and the end of the finger of an outstretched hand (outstretched to the side that is, not in front). In guesstimating distance it is reckoned to be a stride. All this talk of measurement makes me wonder how people managed in times gone by. I have an interest in film photography and old lenses, and have been particularly fascinated by the UK company Taylor, Taylor, Hobson (who eventually introduced and manufactured the famous ‘Cooke’ lenses). They were early adopters of the RPS standard which used Whitworth threads in specific sizes for lenses and fixing flanges, 24TPI or 12TPI, depending on size. The fit of these items is truly delicious, made in the late 1800s. ?(TTH also made and sold machinery, including engravers and measurement equipment. One of their lesser known later inventions is dimples on the golf ball !) Then we have clocks… I was lucky enough to see some wonderful, beautiful Harrison clocks at an exhibition at the Greenwich Observatory (London) in the millennium year, 2000. The tale of Harrison and the competition set by the Navy to solve the problem of accurate navigation is quite well known and drove their development I think. How on earth did he achieve such accuracy, so long ago? The horologists among us may know… It seems stuff is all too easy these days, calculators, computers, DRO, CNC, digital everything. I’m just pleased to have discovered dial indicators (having spent the vast majority of my 66 years blissfully unaware of their existence :-) |
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Re: Off Topic measuring units
I have a ~4" vernier caliper from the around the time Sweden was changing their measuring system around 1875. Three of the scales I've ID'd, but one is really odd- the unit size is about 1.6".? One of the scales is "tums", (thumbs), which were about .97". -Dave
On Friday, September 15, 2023 at 08:59:20 AM PDT, Martin P. via groups.io <mdupreno1@...> wrote:
I will readily admit the Metric system (Actually S.I.) is more logical and calculation-friendly. I grew up with U.S. Customary, so that is most natural for me. That said, I do like the color (colour) of U.S./Imperial system. The foot was originally supposed based an English king's foot. Someone here knows which one. The mile is from Latin mille, 1000. Originally 1000 Roman long paces (about 5'). IOW, based on something tangible. The meter was like that originally, one ten-millionth of the distance from the to the along a . Redefined several times into something arbitrary. Which adds another wrinkle to U.S. Customary. Now we have two different feet, the common or officially the International Foot, which is based on a metric conversion. The U.S. Survey Foot, which corresponds to the original foot used in historical surveys. (1 FTUS = 1.000002 FT) It can make a significant difference when using State Plane Coordinates, which here in Florida the Northings and Eastings run into six digits left of the decimal. Martin P.
On Thursday, September 14, 2023 at 09:23:02 PM EDT, Gerald Feldman <gfeldman2904@...> wrote:
Metric rocks <snip> furlongs per fortnight. ? Jerry F. ? ? ? |
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Re: What is the 'BEST' Unimat ?
I have a couple of Brown & Sharpe 6" rules that have tenths and hundredths on one side.? One has 32nds and 64ths on the reverse, but the other is blank.? I don't know how many times I've picked up the blank one wanting to use the fractional scale and ended up estimating using 10ths scale.? When I took drafting and architectural drawing in high school, we had one drafting table out of the 30 or so in the class where all the scales were 1/10 and 1/00.? It was rarely used.? -Dave
On Friday, September 15, 2023 at 07:43:06 AM PDT, Martin P. via groups.io <mdupreno1@...> wrote:
As an engineer working with land surveys and building design, I routinely use 10ths and 100ths of a foot, as well as feet and inches and fractions. As a shooting aficionado, I am used to caliber (100ths of an inch), and millimeters. So I have no problem visualizing dimensions in any of these.
On Thursday, September 14, 2023 at 02:03:04 PM EDT, Peter Brooks <peter@...> wrote:
You engineering types have all been decimal for years… tenths, hundredths, thous… |
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Re: Off Topic measuring units
I will readily admit the Metric system (Actually S.I.) is more logical and calculation-friendly. I grew up with U.S. Customary, so that is most natural for me. That said, I do like the color (colour) of U.S./Imperial system. The foot was originally supposed based an English king's foot. Someone here knows which one. The mile is from Latin mille, 1000. Originally 1000 Roman long paces (about 5'). IOW, based on something tangible. The meter was like that originally, one ten-millionth of the distance from the to the along a . Redefined several times into something arbitrary. Which adds another wrinkle to U.S. Customary. Now we have two different feet, the common or officially the International Foot, which is based on a metric conversion. The U.S. Survey Foot, which corresponds to the original foot used in historical surveys. (1 FTUS = 1.000002 FT) It can make a significant difference when using State Plane Coordinates, which here in Florida the Northings and Eastings run into six digits left of the decimal. Martin P.
On Thursday, September 14, 2023 at 09:23:02 PM EDT, Gerald Feldman <gfeldman2904@...> wrote:
Metric rocks <snip> furlongs per fortnight. ? Jerry F. ? ? ? |
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Re: What is the 'BEST' Unimat ?
Carl's post reminded me to add that, as he pointed out, some liquids at the grocery are measured in fluid ounces, some in liters. Canned foods are typically in ounces of weight (avoirdupois, troy ounces are for precious metals). Fresh meats and vegetables in pounds and ounces. But take a look at the required nutritional information on any packaged food, and you will see grams! Land mph, on the water, knots. Even though we (in the English-speaking world) tend to think the push to metrification started in the 1970s, not so. In WWII, U.S. Navy used artillery bore in inches, range in yards. While at the same time U.S. Army had bore in millimeters, range in meters. My father was Army artillery in the Pacific campaign, fired 155 mm "Long Toms", the most powerful artillery the Army had. Sometimes they had to call on the Navy to defeat Japanese hardened concrete bunkers. 16" guns fired from (nautical) miles at sea. They had better get the conversion correct! The medical profession in USA has long used metric units. Martin P.
On Friday, September 15, 2023 at 10:43:05 AM EDT, Martin P. via groups.io <mdupreno1@...> wrote:
As an engineer working with land surveys and building design, I routinely use 10ths and 100ths of a foot, as well as feet and inches and fractions. As a shooting aficionado, I am used to caliber (100ths of an inch), and millimeters. So I have no problem visualizing dimensions in any of these.
On Thursday, September 14, 2023 at 02:03:04 PM EDT, Peter Brooks <peter@...> wrote:
You engineering types have all been decimal for years… tenths, hundredths, thous… |
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Re: What is the 'BEST' Unimat ?
As an engineer working with land surveys and building design, I routinely use 10ths and 100ths of a foot, as well as feet and inches and fractions. As a shooting aficionado, I am used to caliber (100ths of an inch), and millimeters. So I have no problem visualizing dimensions in any of these.
On Thursday, September 14, 2023 at 02:03:04 PM EDT, Peter Brooks <peter@...> wrote:
You engineering types have all been decimal for years… tenths, hundredths, thous… |
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Re: What is the 'BEST' Unimat ?
Unimat? I can do .5, ,6, .75, .8, .9, 1.0, 1.25, and 1.5 on my DB.
On Thursday, September 14, 2023 at 11:04:33 PM EDT, Dave Seiter <d.seiter@...> wrote:
One of these days I'm going to get a small native metric lathe specifically for metric threading.? ?Eventually... -Dave |
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Re: What is the 'BEST' Unimat ?
Bringing the discussion back to Unimats. Re-read the Unimat manuals written for the U.S. market (Miniature Machining Techniques). The 1963 version, at least, speaks of the .04" you mentioned. Though most camera, optical and instrument parts are setup with metric system threads, you may prefer to work in inches. One millimeter equals .03937 inch. For all but the most exacting work, you can round off this decimal to .04", the amount of feed in one turn of the handwheel. In inches, each small mark is a feed of .002'" It is important to remember that when you are cutting across the lathe bed, that you reduce both sides of the workpiece at once. Thus, turning one calibration actually removes double the feed, 004": a complete turn of the handwheel, .08".
On Thursday, September 14, 2023 at 12:49:03 PM EDT, Charles Kinzer <ckinzer@...> wrote:
Here is how they have "English" units on a lathe that is natively metric.? One turn of the handwheel is 1 mm or 0.0394 inches.? That's pretty close to 0.040 inches, so they just mark the wheel in 40 increments as being "close enough."? It seems that most buying these (amateurs and hobbyists) are not bothered as they tend to measure otherwise for the final cut otherwise or something.? Or spend most of their hobby trying to improve the lathe otherwise as an end in itself.? Or don't know.? Or don't care. |
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Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?
开云体育Hello Chris: I just checked and a pound (US) equals 453.5924 grams. I do
find package sizes very interesting. Often I think they use
odd sizes to make price comparisons difficult. Different
packages of the same product will be in even ounces, pounds,
kilos or grams and sometimes not an even amount of anything! Carl. On 9/15/2023 5:32 AM, Dr Chris Woodcock
wrote:
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Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?
The confusion is worse, arguably, in the UK.? Here we measure milk and petrol (gas) in litres but beer in pints.? Jam and marmalade is still sold in glass jars of standard size 254 grams (exactly equal to one pound).? And our road signs always give distances in miles although the media and other "official" reports insist on using kilometres.? Sadly, our delightful?currency of pounds, shillings and pence seems to be long gone!? Fortunately, most engineering tape measures still show an imperial scale on one side and metric on the other, which provides a handy quick conversion. Chris Woodcock On Thu, 14 Sept 2023 at 18:39, Bill in OKC too via <wmrmeyers=[email protected]> wrote:
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Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?
开云体育Mike, ? I was hatched in the 1940s, and because most of my classes in school and university were in science-based subjects, I had to learn both imperial and the “old” metric system.? And then around 1960 the S.I. in France got to work and started to reorganize all of the metric units to base them on the Meter-Kilogram-Second (MKS) basic units instead of the centimeter-gram-second (cgs) units.? This, of course, meant learning how to redefine all those combination and special units.? When I became a health physicist, I became very used to dealing with the old radiation units (such as curies for activity, and rads for absorbed dose).? Then in the 1970s, I had to learn the “new” units (such as the Becquerel for activity, and the Gray for absorbed dose – amongst others) and to convert from one to another.? As all work since then used the new units, it made my brain hurt to think in terms of these new units instead of those with which I was already familiar).? For some reason I found this much more difficult for me to do than going from imperial to metric. ? Jerry F. ? From: [email protected] [mailto:[email protected]] On Behalf Of Mike Gidley
Sent: Thursday, September 14, 2023 10:23 PM To: [email protected] Subject: Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ? ? Hi All |
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Re: Mensuration, was Re: [Unimat] What is the 'BEST' Unimat ?
Hi All
Being old born in the middle of last century. I started life using Imperial Units which is slightly different to the US customary Units and then in the 1970s we (Australia) converted to Metric. I was one year into an Engineering Degree and I had to learn everything in Both Systems. I never convert one system to the other as this causes mistakes and confusion. If you start in one don't try to find a comparison to the other e.g. 1/3 of a metre for 1 foot.? This dosen't apply to Critical measurments for retro fitting a part. When we do designs we just use millimetres (yes Australia uses the French spelling of the units) This avoids decimal places in large projects.The decimal places are for smaller machining size projects. And my last word The best unimat is what you have or what you can afford to own. My best Unimat is a Unimat3 and an old worn out Sherline, all backed up with a Optiturn1503 TU Chinese made (German lathe).? |
Ronald LHerault
Carl
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