Changing pulley on a Family Sew motor

[mikesc]

Just a test ..

https://leatherworker.net/forum/topic/67110-will-the-150-chinese-servo-motors-from-ebay-work-on-an-old-adler-68/

OK tested..it seems happier if I leave out the "external nofollow"..which normally , when I link on my own sites , I would never use nofollows, I only include them here because most of the links in source code that I've seen here have had them nofollowed ..( apparently the IPS board software rewrites them that way ) ..so..I thought when adding HTML tags by hand.."when in Rome"..But checking your edit to the source code..and my link in my last post..the external nofollow is not present, even though I included it..So possibly on links within the same site it gets stripped, or maybe there has been a "silent upgrade" that strips it..

Either way I'll leave it off in future..and try to remember to test my posted links..

The "nested and re-nested quote" divs that the board software puts in each time I edit a post are the ones that catch me out unless I anticipate and strip them.. :)

Now..back to pulleys and speed reducers ( I make my own speed reducers with combinations of bearings , shafts and "bought" pulleys at 5:1 ) ..making pulleys I'd need a lathe, and space for a lathe for.. :(

Edited June 9, 2019 by mikesc

[SolarLeatherMachines]

On 6/9/2019 at 11:42 AM, mikesc said:

The problem with Imperial,is that it is inconsistent, it changes it's base multiplier or divider depending on "the size"..or "the thing"..

1000 thou' per inch..or 8 eighths or ( "this many" "whatevers" per inch ) ... and then it changes again when going from (12 )inches to a foot ,and again when it goes from feet ( 3 ) to a yard ( 220 ) yards to a furlong, not to mention (40 ) rods per furlong..( which means that a rod is 5 and half yards..or 16 and half feet , or 198 inches ).. and 1760 yards per mile..No logical progression at all, measurements that do not relate to each other by any common denominator..apart from that of one inch ( which used* to be based upon an "average" man's thumb from the joint to the tip..Mine ( because I'm big..is one and one half inches ), someone else's measurement there is different again..

Btw..Both the USA and Canada use currencies which ( no-one living in those "non metric" countries has any problem with ) are divided by 100..and neither has 12 dollar bills, or 36 dollar bills etc..The attachment to "imperial" is just that, an attachment to a measuring system imposed by the British Empire..and even the British currency went metric ( I grew up with their old guineas, pounds, crowns , half-crowns, two shilling pieces, shillings, sixpence, three penny bits, pennies, halfpennies, farthings etc ...nightmare for most people to "make change" without a piece of paper and a pencil to calculate it, and even then getting "short changed" was an every day occurrence, which many did not do deliberately, nor notice if they were on the receiving end, unless their mental arithmetic ability was above that of the average person ) ..The weights and volumes were on different bases again..and as you note, the gallon varies depending on where you are..

Metric base 10 ) is consistent , easy to calculate, and the same base is used for currency, weight, volume, everything, only one thing for children to learn..how to divide or multiply by 10..

*People are getting bigger with each generation , in all countries, due to better overall nutrition, more food, imperial is even less relevant to current humans than it was before, where not all people in all countries were of equal size, they still are not..

Europe is entirely metric..and is a bigger market than North America, so change to being supplied in metric will happen..even if as a result of Brexit the UK were to revert to imperial, the numbers are in favour of metric worldwide..even India is moving steadily towards metric, they currently use both, what they manufacture marked in inches and metric sizes, like plumbing supplies is primarily for the USA market..China and Russia are already using metric , again they manufacture and mark some things in imperial "equivalents" for the USA ..

You'd avoid all these "shims" and "reaming out to fit" and "adjusting" if everyone went metric..your money already is..

Yah.  I've worked for over a dozen years as an aerospace design engineer for Boeing, Lockheed, Raytheon, Triumph, etc.  I'm fluent in both systems, and can attest that the metric system is easier in all calculations.  Americans don't like it because we generally have no point of reference, i.e. we don't know what 30 centimeters look like, but we know what a foot length is.   Especially when working on machines, I prefer metric.  The metric system for fasteners is vastly easier, provided you have the tools.  most people don't have a full set of metric tools and that causes issues.  The USA will change over to the metric. It's already happening.  The most important industries (robotics, medical, automotive) are now mostly metric.  Another generation, and it will be full adopted.  

[DrmCa]

Imperial or metric really makes no difference for CNC but if you have a manual lathe, it does one or another but not both.

Imperial fractional wrenches and socket heads are very straightforward: they either do not fit over the bolt head, or spin freely. With metric sockets it might feel like you got an 11mm bolt, but in reality it is 10mm and you have to test 2 sockets, or you are rounding it. I hate metric bolt heads even though I was born and received my engineering degree in Europe.

Standard metric M threads are finer than standard fractional imperial threads. Each has its own uses. Imperial thread as fine as the standard metric thread requires a non-standard hard to obtain tap or die.

US and Canada should stay with imperial and Europe should stay with metric. Says a European expatriot.

[mikesc]

Europe being a bigger market, the Chinese and the Indians ( who Europe, the USA, Canada? Australia , New Zealand, Africa, South America, Russia, Polynesia etc etc * ) get most of their manufactured goods from, will eventually make all metric..The reason an 11mm will fit over a 10 mm and "confuse" is because metric nuts and bolts "increment" in smaller "jumps" ( millimetres ) than imperial nuts and bolts..which tend to go up in "eighths"..which are each around three times bigger than a millimetre..I have tools for all kinds of systems ( comes from owning old classic and vintage motorcycles and cars )..one can never have too many tools :)

Could be worse..

Singer threads, nuts, bolts and screws..

* Some states, regions and countries left out for brevity..

Edited June 10, 2019 by mikesc

[Northmount]

3 minutes ago, mikesc said:

Singer threads, nuts, bolts and screws

Off the main topic:

I worked in a electric utility plant.  We had 2 steam turbine generators built by Parsons (UK).  One was purchased and installed before WWII.  The other was purchased and installed post war.  Both were the same capacity, but the threads were different for each unit.  So had to have 2 sets of common parts, and 2 sets of wrenches.  Couldn't even have common British/Imperial units!

I inherited a set of taps and dies.  Didn't notice at first that they were Witworth threads instead of our common NC of NF Imperial measures.  Messed up a number of bolts and threaded rod!

Tom

[mikesc]

I feel your pain Tom..
Speaking of sets of taps and dies..Whoever makes and sells a set of Singer tools ( including taps and dies for the old ones ) will get my business ( and I think, that of many others ) , problem is that Singer seem to have changed their threads "back in the day" depending on the weather.

Edited June 10, 2019 by mikesc

[DrmCa]

China works in Imperial  and Metric depending on the order. I own custom order taps in fractional inches made in China and their quality is superb. As they use almost 100% CNC machines, it matters not what unit the blueprint/model uses. North America can continue using imperial units just fine even though it gets much of its goods from China.

[mikesc]

China works in Imperial and Metric depending on the order. I own custom order taps in fractional inches made in China and their quality is superb. As they use almost 100% CNC machines, it matters not what unit the blueprint/model uses. North America can continue using imperial units just fine even though it gets much of its goods from China.

For now..but as a result of "recent trade disputes with the USA"..Chinese companies are looking ( and finding ) more "stable" partners..Beginning with Telecoms equipment ( Huawei's deal with Russia, and pending deals with various EU countries ) ..China is all about "stability", they can ( and do ) turn off the supply of things ( or increase the export prices ) to countries that they do not consider to be stable partners..

The supply of "Rare Earths" is a lever that they have recently begun to apply pressure on..Taps, Dies, Nuts , Bolts, and so on that the USA and Canada needs to buy from them, could be a very effective additional lever, such items may yet see their export prices rise , or delays in orders get longer.."trade pressure" can be applied in many ways..including "both ways".

Edited June 10, 2019 by mikesc

[Gregg From Keystone Sewing]

[DrmCa]

The temptation of 3d printing a small pulley is almost irresistible. I am going to try it tonight.