What Did You Do Today (2017)

[Anonymous]

Posted by Neil Wyatt on 14/07/2017 10:56:06:

As an electronic analogy, I think a governor is nearer to a linear controller rather than PWM

It's a PID controller, without the D. And I'm not sure I see how the I would be implemented, so probably just P. Which suggests that the gain needs to be high to minimise speed inaccuracy, ie, a steady state error. But not so high as to be unstable.

Actually I was beaten to the description. Apparently James Clerk Maxwell developed a lot of the control theory in a paper entitled 'On Governors'. I'll have to see if I can get hold of a copy. The local university library, being a copyright library, must have a copy if all else fails.

I'll contemplate starting a separate thread on steam engine governors, although I wonder how long it will take for the 'experts' to wade in with insults, like they did on steam injectors.

Andrew

 

EDIT, dedicated Governor thread can be found here

Edited By JasonB on 15/07/2017 14:29:23

[Colin HeseltineParticipant @colinheseltine48622]

Collected a part completed Anzani 'Y' engine. This will be a long-term project I think. Crankcase is machined and bearings fitted. Cylinders fully machined and valve guides fitted, liners and pistons machined. Rings made but need heat treatment. Have all gears and bushes. Crank 90 % made but has a slight bend issue, which I need to see whether is resolvable or a piece of scrap. I know its not the crankcase as a dummy crank spins freely. This has no crank webs or big end. It may be possible to use this as a base for a fabricated crankshaft and used pinned webs and big end. Not sure how feasible this would be as oil feed holes are required through the first main bearing into the crank, up through the web, across the big end, down through the second web and into the second main bearing. The pins might get in the way or weaken the crank.

Anyway I'm sure it will provide lots of fun and games over the next years or so, plus lots of bad language as I cock things up.

Colin

[Phil PParticipant @philp]

I went to look round a private car collection in North Yorkshire today, they must have more rare and early veteran cars and tractors and motorcycles than all the other museums put together, the sheer quantity and quality of the exhibits was mind blowing.

If ever you get a chance to visit the Ward Brothers Collection, dont miss it.

Phil

[Cornish JackParticipant @cornishjack]

As part of my current 'make the workshop habitable/useable again' efforts, collected an ex-school multi drawer unit which MAY provide tool storage and the ability to find things!! Felt very virtuous, so treated myself to a 'wallow' in the First Night of the Proms and Ludwig V-B's 3rd Piano Concerto – Bliss from the 'beetfield'

rgds

Bill

[BazyleParticipant @bazyle]

Just back from the EDMES club meeting. I entertained or bored them to death with slides of a few recent shows but as I now mostly only take pictures of what I haven't seen before it was a bit lopsided.
Good news is we a 'not no' from the authorities to submit plans for a track on the grade2* listed property provided we don't dig more than 4 inches deep.

[thaiguzziParticipant @thaiguzzi]

Posted by Martin King 2 on 13/07/2017 15:06:48:

Hi All,

Bit off the wall but I have been messing about with the bits and pieces left over from a large haul of micrometers and milliing cutters and finally came up with this but not sure which 'shade' looks best (if any!)

Its been fun doing it and even 'The War Office' approves!

I am clearly losing the plot…. Cheers, Martin

Very nice. Right up my street. Sort of stuff i used to have in the house back in Blighty days.

[john carruthersParticipant @johncarruthers46255]

Today I started thinking about how to fit stepper motors to the prototype AWR 'PEM mini'. (little brother to the PEM telescope mount).
Brackets, motor and 3:1 pulleys to fit.
All stainless, (except PB wormwheels) ~ 25kg.

 

Edited By john carruthers on 15/07/2017 14:10:28

[Neil WyattModerator @neilwyatt]

Just seen Andrews posting…

Went to Tesco, got a 128 GB Sandisk SD card for £12 – cheaper than 64GB and 16GB cards in the same speed class. Not sure what's going on, but it was the only on left!

Neil

[Neil WyattModerator @neilwyatt]

Posted by john carruthers on 15/07/2017 14:09:43:

All stainless, (except PB wormwheels) ~ 25kg.

How are you sourcing your wormwheels?

Neil

[Nick_GParticipant @nick_g]

.

Friend of mine has a jobbing workshop. One of his machines is a Colchester Triumph 2000 that is of 1984 manufacture.

It needed a new cross slide feedscrew and nuts as the amount of backlash was becoming far too great. I used it a couple of months ago when making the cylinder liner for my hit and miss engine and inspite of this issue was a lovely machine to use.

This machine has done a lot of work over the years and this will be it's 3rd leadscrew. The original one. One he replaced a number of years ago and now this one. Not an item at £680 plus the VAT for the screw and nuts that one would want to replace too often now is it.?

He wanted to replace it on a Saturday so that he was not getting pestered by the phone ringing while doing it and I said I would give him an extra set of hands.

Said machine. (with 10" thick wall tube in the chuck)

New parts that are encased in protective plastic wax stuff (no idea of it's correct name. Perhaps someone will inform)

And the old leadscrew removed. The wear on it can be clearly seen by looking at the crests of the thread in the middle and then at the outsides where they do not get so much use.

Nick

[Mark RandParticipant @markrand96270]

Crocell Dip

[john carruthersParticipant @johncarruthers46255]

>>All stainless, (except PB wormwheels) ~ 25kg.

How are you sourcing your wormwheels?<<

Alan Buckman (AWR) gets them from Beacon Hill, I haven't tested one yet but they look good.
They have a new gear hobbing guy so it will be interesting to see. He's set up a new hobbing machine.
Either PB wheel and a SS worm, or ally wheel and a brass worm.

John.

[Chris Evans 6Participant @chrisevans6]

Today I took some stuff to the local Air Ambulance charity shop and found whilst dropping it off a set of "Bisley" drawers. These are the kind with 15 A4 size drawers in. Now got another project to make and fit dividers and store my taps and dies etc. I have been looking for a set of these drawers for a long time and £8 was a real score.

[Michael HornerParticipant @michaelhorner54327]

Repaired the top bearing on my Bultaco 250T by fitting a sleeve bearing. The shaft runs directly in the aluminium which had worn considerably. The shaft itself has worn but when I put it all together it's not bad. I did buy materials to repair the shaft but the work involved to remove a few thou' play didn't seem worth the effort plus I realised I made a mistake in my measuring so could have ended up with a locked up shaft.

[paul rushmerParticipant @paulrushmer83015]

Chris

try searching bisley insert on Ebay not cheep but very use full.

Mite be helpful

Paul

[JasonBModerator @jasonb]

Few strips of wood stuck to a thin MDF or ply base makes cheap dividers

[Neil WyattModerator @neilwyatt]

Posted by john carruthers on 16/07/2017 07:41:08:

>>All stainless, (except PB wormwheels) ~ 25kg.

How are you sourcing your wormwheels?<<

Alan Buckman (AWR) gets them from Beacon Hill, I haven't tested one yet but they look good.
They have a new gear hobbing guy so it will be interesting to see. He's set up a new hobbing machine.
Either PB wheel and a SS worm, or ally wheel and a brass worm.

John.

Thanks. I bet prices are scary

Edit –  a little intimidating, but not quite as scary as I expected. What an awful website!

Edited By Neil Wyatt on 16/07/2017 10:20:15

[SillyOldDufferModerator @sillyoldduffer]

Posted by Chris Evans 6 on 16/07/2017 09:20:53:

Today I took some stuff to the local Air Ambulance charity shop and found whilst dropping it off a set of "Bisley" drawers. These are the kind with 15 A4 size drawers in. Now got another project to make and fit dividers and store my taps and dies etc. I have been looking for a set of these drawers for a long time and £8 was a real score.

Another vote for Bisley.

Original Bisley Cabinets are rare where I live. Local charity shops and a large secondhand furniture store failed to deliver after a 2 year search so I bought new off ebay or Amazon, about £50 depending on colour.

A modern Bisley is of lighter construction than those of my youth but still amazingly useful for organising small tools etc.

No dividers made for my dividers (groan!) I simply lined the cabinet with rubber mesh drawer liner. Mostly because I'm lazy, partly because it leaves more space in the drawer.

Dave

[Neil WyattModerator @neilwyatt]

Final results of my camera butchery. Other people's experience suggests I may get as much as 30 degrees C of cooling.

This is a comparison of a 1-second exposure at 22 degrees ambient, and a 10 minute exposure with cooling, both stretched about 32 times to make the noise in apparently black images visible. The second has very slightly more noise. I should be able to take very long exposures of faint objects without losing them in the noise now.

[NigeParticipant @nige81730]

Nice visit to the Peterborough Model Engineering Society summer steam event today. Lots of small traction engines on show in the field, mostly Burrels but there were others there as well. Grandchildren enjoyed the train rides too. The model boat club were also there with a fine display craft, everything from an amphibious jeep to a great crested grebe! It was very nice to finally meet up with Howard Lewis and take a look at the items he has built. Knowing I was coming along he very kindly made me a small stand that will hold my imperial sized DTIs, Thank You Howard, a very kind gesture and not the first from the members that inhabit these forums.

Nige

[Anonymous]

Not a lot, but I did start machining the central tubes for the governors from 5/16" rod. They're 3-9/16" long, although I'm sorry to say that one of them is a couple of thou short.

There is a 4.2mm hole drilled all the way through, roughly half way from each end. I'm feeling slightly smug that the long series 4.2mm drill shown goes smoothly through the holes by hand, so the two holes must have met pretty much spot on. The 5/32" rod that will form the spindle for the governor is a nice, slightly rattling, fit; so no problems there from friction.

Of course being smug about the holes probably means that I'll bog up screwcutting the 5/16" 32tpi threads on the ends later this week.

Andrew

[Martin ConnellyParticipant @martinconnelly55370]

Not done today but over the weekend. Some 110mm long spacers in nylon and delrin (I don't know any sub type, I was given it to make the parts from). The centre part was machined with a 6mm button insert at 1000rpm, 200mm/min feed and 0.5mm doc. Any faster and heat starts to become a problem. Surprisingly too slow also causes heat problems with a very poor finish. The ends were machined with a tangential (diamond) tool.

Martin C.

[RobboParticipant @robbo]

Bisley cabinet dividers – for a quick job I use plastic angle cut to length and stuck on with double sided tape.

Angle available in various widths and colours and 3 metre lengths from builders merchants

[Martin KyteParticipant @martinkyte99762]

Posted by Neil Wyatt on 16/07/2017 15:43:04:

Final results of my camera butchery. Other people's experience suggests I may get as much as 30 degrees C of cooling.

How much shake do you get from the fan?

regards Martin

[V8EngParticipant @v8eng]

Posted by Martin Kyte on 18/07/2017 09:40:29:

Posted by Neil Wyatt on 16/07/2017 15:43:04:

Final results of my camera butchery. Other people's experience suggests I may get as much as 30 degrees C of cooling.

How much shake do you get from the fan?

regards Martin

I expect the hands frozen to the camera at -30 degrees cancel it out.

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