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Member postings for Stub Mandrel

Here is a list of all the postings Stub Mandrel has made in our forums. Click on a thread name to jump to the thread.

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Thread: 2 questions - threading silver steel; tightening bar in the chuck
07/05/2010 21:00:13
Posted by John Stevenson on 06/05/2010 08:24:10:
Posted by Stub Mandrel on 05/05/2010 19:40:47:
Posted by Ian S C on 17/04/2010 12:11:00:
Meyrick, iI imagine that your mic is a digital one, as I'v never heard of a mechanical type with that sort of definition, you would just about need temperature controled condions to maintain accuracy, you realy need that for 0.0001" let alone a 1/10 of that. Sorry we're wandering. Ian S C
 
0.00001" is about 0.00025mm - 250 nm. That's less than a wavelength of red light. So i vote with Ian's scepticism here
 
Neil

 Pity Myfords don't work to the same tolerances...............

 They should invest in mini-lathes - smaller lathe, smaller work

Thread: How do I demagnetise tools and parts of machines
07/05/2010 20:54:50
My Dad used to have a degaussing coil for TV tubes - It was about 10" diameter on (IIRC) a tufnol frame and you demagnetised a tube by pressing a button on the (mains) coil and waving it around the tube then walking slowly away to, I think, about 10' distance.  I don't know how many turns the coil had, but I can imagine it would work well for fair sized tools. Note it didn't have a steel core - the steel core on a transformer traps the magnetic field. I'm sure demagnetising tables must have steel cores, but with open poles at the demagnetising areas.
 
When I had a blue spot on an old CUB computer monitor some ten years ago, I managed to demagnatise it by waving a ceramic speaker magnet at it - but it took a few goes! Not sure THAT would work for tools
 
Neil
Thread: Model Engineer 4377
06/05/2010 21:42:15
Well done David Abbott for his tin can engine!
 
I have no problem with long series - although preferably not more than three locos at a time please - but short series about simple or unusual models or gadgets can be equally engaging.
 
David's engine could be straight out of a 1940's edition of ME, a time when ingenuity was more important than having the latest kit. This is a good article because it is something a beginner could tackle as an introduction to the thrill of making a first working model. It also puts to shame those of us who keep putting off making a stirling engine!
 
Give the pear can engine an honorary gold medal for capturing the true spirit of model engineering.
 
Neil
 
P.S. - safely gloved hands in can cutting pic duly appreciated!
Thread: 2 questions - threading silver steel; tightening bar in the chuck
05/05/2010 19:40:47
Posted by Ian S C on 17/04/2010 12:11:00:
Meyrick, iI imagine that your mic is a digital one, as I'v never heard of a mechanical type with that sort of definition, you would just about need temperature controled condions to maintain accuracy, you realy need that for 0.0001" let alone a 1/10 of that. Sorry we're wandering. Ian S C
 
0.00001" is about 0.00025mm - 250 nm. That's less than a wavelength of red light. So i vote with Ian's scepticism here
 
Neil
Thread: 5" Rocket
02/05/2010 19:50:50
Thanks Geoff,
 
I had a feeling Ian Bradbury was wrong .
 
Neil
Thread: Take care of your eyes!
01/05/2010 22:16:32
I don't know what it was but I got something in my eye today. I had been milling (wearing goggles), rough sawing timber, hauling around broken, used breeze blocks and a trashed storage heater, spray painting and using jenolite. (Busy day, eh?)
 
I just had the usual 'gritty eye' sensation, and tried tio wash whatever it was out under the tap a few times.
 
Well a bit later my wife had to take me to A&E after my eyeball started blowing up with a bag of yellow fluid on the front. After the three hour wait it had begun to go down again, but I've scratched my cornea and really upset the rest of my eye. Luckily no serious damage.
 
As I say I don't know what it was, but I'm going to just try to a bit harder to remember goggles, especially when milling.
 
Neil
Thread: Plated Morse taper
01/05/2010 22:09:55
Another dustbin diving session today. two draper morse adaptors 3MT to 1 and 2 MT : )
 
Surface rust but otherwise really bright (brighter than my new ones), but it isn't chrome but very fine ground steel.
 
Neil
Thread: 5" Rocket
01/05/2010 22:06:47
There was a beautiful solid silver model of Rocket built by (?)Ian Bradbury that I#ve seen in ME back issues. I think Mike Chrisp built the OS rocket and serialised his experiences. There's also the rather cruder Hornby live steam version.
 
So no reasons why 5" one shouldn't suceed.
 
Neil
 
Thread: Darjeeling Saddle Tank 0-4-0 New series starting in ME 4378
01/05/2010 22:01:05
Eric,
 
I remember seeing an 0-4-0 shunter without a boiler, just a big reciever for high pressure steam. was it at the Bass Museum (AKA Coor's Visitor Experience!!) or Coalbrookdale?
 
Neil
Thread: "Foundation" book has got me worried
29/04/2010 19:52:28
I dry lined an ancient concrete 8 by 16 garage. No problems, except the day I pressure washed the outside and water got in under the eaves (idjut me).
 
Your biggest problem is the bikes. Wet, warm bikes will mean condenstaion. if you don't use it for a car I'd divide it into two. 3x2 timber studding is MUCH cheaper than most timber that size, plasterboard is cheap and so is polystyrene to fill in  the gaps. It's easy to run wiring in the walls and arrange the framing to support benches/shelves as required.
 
I also put a plastic mebrane behind the plasterboard and on the concrete floor. On the floor I then put down plastic DPC below wooden beams, then a floor of ODB. Since then I've used chipboard flooring for a utility room instead which I think is a little more rigid.
 
Neil
Thread: Single Phase motor speed control
29/04/2010 19:38:15
Thanks Folks,
 
I followed the Drives Direct advert over here -------->
 
and they do a 1/3hp motor and speed controller for £145
 
I think I'll fit a few pulleys and keep the Hoover for my Pott's spindle and a few things like that, and save up for one of the above as a guaranteed solution.
 
Neil
Thread: Cutting Bevel Gears
27/04/2010 21:54:16
Thanks EB; all mine have been matched pairs. I'll make a note in the book.
 
I made a mistake on the Z-height for one of a few mm and ended up with a skew gear - surprisingly it meshes fine with an ordinary gear, although I haven't used it.
 
Neil
Thread: Single Phase motor speed control
27/04/2010 21:52:02
I was given a 1/3 hp Hoover 1,420rpm capacitor start/run motor two days ago. It's probably 1974 vintage, beautifully made with tiny oilers at each end!
 
It's a nice size to replace the DC motor on a mini-lathe, but is there a cost-effective source of speed controllers for SINGLE-PHASE AC motors. A variable volatge and frequency inverter would be needed.
 
Any suggestions?
 
thanks
 
Neil
Thread: Can Anyone Name this Engine?
27/04/2010 21:37:29
Posted by Steve Garnett on 21/04/2010 00:19:53:
Posted by Nicholas Farr on 20/04/2010 21:50:31:
Hi, it looks a lot like a Briggs & Stratton engine I once had on my cement mixer.

 It certainly doesn't look like a Colt engine - the arrangement of head bolts is different, for a start...

 I think it is. Les sent me  a set of scans of the full drawings. Almost every other part is identical but it seems there is an old 78cc cast iron block version (mine) and two larger (98cc and a bit bigger) with an alloy block. Oddly some parts are still available for the early one buit not the other.
 
I've welded up a cowling from some storage heater - my first bit of arc-weld fabrication, rather than patching over rust. A few minutes on the bench grinder and a double dose of P38 and it looks, well, like a rusty old but restored original. Now I'm having a go at hand pin-striping it...
 
Paint stripper has brought the carb up a treat. A Zenith 13 TCA. All sorts of holes and the cutout contact painted over, its amazing if it worked like that! Found two asbestos gaskets too
 
Two questions for Les, if you'd be so kind - can you give me a rough idea of the governor flap spring - on mine it's been replaced by a bit of brass which will defeat the governor action? Also, can you let me know the spark plug type?
 
Many thanks
 
Neil
Thread: How to sharpen centre drills?
27/04/2010 21:28:39
I have an ocassional problem when centre drilling from the tailstock - once in a blue moon* the drill wanders off centre and creates a circuilar groove, and forcing it snaps the drill
 
Keeping a close eye on things and forcing the drill back on centre can cure it just as it starts, if I am quick. I think the cause is an over-extended, unlocked tailstock.
 
Neil
 
*my cussing turns the air blue too...
Thread: Cutting Bevel Gears
27/04/2010 21:22:36
What is the error Brian Perkins found? I have cut about eight bevel gears using Ivan Law's method without problems, all quite small.
 
Out of curiosity has anyone made a Eureka? I have some 2 1/2" EN1A and some 1 1/2" silver steel ready, but he specs EN8. Would EN1A cope (I might only make a couple of cutters a year).
 
Neil

Edited By Stub Mandrel on 27/04/2010 21:24:17

Thread: Do you get what you pay for ?.
27/04/2010 21:10:03
Taps are a lottery. I have a set of even number (0-8) BA carbon steel LAL taps and dies that belonged to my Grandfather (pre 1960s) and I was only using some a week ago. I have bought various ones recently -  a full set of BA was cheaper than just the odd ones, some small metric and BA sizes and various ME sizes - and some are excellent some are dodgy with no obvious indicator price or material, though HSS seems to be more resistant to breaking than carbon steel.
 
Oddly the best set of taps I have, I got on a market for £19 - a full HSS set of three taps and a die for M3 up to M10. I have tapped everything up to stainless with them without any breakages (touches wood).
 
But I suggest starting with a fairly cheap set, and replacing the odd breakage with better quality HSS.
 
Neil
Thread: Ball Nose Mill Cutter, did I break it?
27/04/2010 21:03:38
FWIW I used a round file when I built my 10V...
 
Neil
Thread: Diesel engine
27/04/2010 20:59:31
A few years ago there was an article on a Lanz Bulldog tractor. If I recall correctly it didn't use hot bulb ignition, although it had a working blowlamp!
 
The problem with hot bulb is scale effects I imagine. I can see no reason why injectors should not work, as long as you can meter small enough amounts of fuel accurately.
 
Neil
Thread: Dilemma - neither lathe nor mill working
20/04/2010 20:48:30
Check it isn't 3/8" whitworth first!
 
Neil
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