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Member postings for DerryUK

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

Thread: Metre rule - metal
18/12/2015 17:46:54

I want to buy a metre rule in mllimetres only. I have found this ... **LINK**

Anyone know of any other?

Derry.

Thread: Myford motor failure?
24/09/2014 16:38:16

I can report that my motor is now fixed. It was a broken wire on motor terminal Z.

I need to change the motor operation in that today it would run FWD and REV with the drive belt removed. I could also hear the centrifugal switch operating in both directions. However if the drive belt was refitted then all the motor would do on applying power in either direction was hum.

After talking to Les I measured the resistance between the live and neutral mains plug terminals. It was 8.4 Ohms. Referring back to here ...

http://www.instructables.com/id/Dismantling-a-Brook-Crompton-AC-motor-from-a-Myfo/step5/Electrical-resistance-readings/

It should have been 4.2 Ohms or thereabouts. Now referring back to the website above 10.2 and 7.4 Ohms in parallel comes to 4.2 so in my case it would appear that one element was missing, perhaps the start winding?

On removing the motor wiring terminal access plate there was a red wire floating free. To confirm I had the correct terminal I removed the clamp nut on Z and a piece of broken copper wire fell free.

Reconnecting the red wire to Z and refitting the drive belt the motor now operates as it should in both directions.

Many thanks to all for your help.

Finally I should add there is no capacitor on my motor.

Derry.

21/09/2014 17:58:47

Yes I am coming to agree about the switch. It seems odd that both forward and reverse contacts are U/S but to be honest I cannot remember EVER having run the motor in reverse previously. We'll see.

20/09/2014 20:58:24

I did find this link for a strip-down. Be interesting to see if it is the same as mine.

http://www.instructables.com/id/Dismantling-a-Brook-Crompton-AC-motor-from-a-Myfo/?ALLSTEPS

The writer also quotes resistance values for me to compare.

18/09/2014 19:33:20

Thanks for the feedback.

Les, with the drive belt removed the motor will only run with the switch in the forward position. When moving the switch to the reverse position the motor does not run at all.

I can't get my hands on the motor again until next Wednesday but I have a multimeter so I'll use your thoughts to make more checks then.

18/09/2014 14:37:38

I've just been to use my Speed 10 and it won't start, I have not used it for 6 months or so. If I remove the drive belt it will run forwards but not backwards. If I replace the drive belt it won't run again.

Is the motor broken or is there something else I can check?

The motor is a standard Brook Compton Parkinson 50Hz 250W(?), is there a suitable alternative at all? I want to keep it single phase.

Any help appreciated,

Derry.

Thread: What Electronic Projects are you working On
23/05/2014 17:11:44

I am building an Arduino ECU for my '69 T100. It has several clever and unique features.

Derry.

PS well I hope it does by the time I finish it, I've been at it long enough!

Thread: MEW 214
09/03/2014 09:19:47

<after 4 issues trying to follow the "Beginners' Guide to Home Metalworking">

Yes but it's £50 a page irrespective of what's on it. MEW articles don't seemingly get edited so follow Dave's guide to making money, I can't blame anyone for wanting too.

I blame me for moaning and still buying MEW.

Derry.

Thread: Spontaneous Combustion
16/02/2014 20:01:18

From the above references can someone devise a test so we can all give it a go?

Save a fortune in matches.

Thread: how to unsubscibe
13/02/2014 19:35:53

Their email address is mytimemedia@subscriptions.co.uk or

expressmag@expressmag.com for USA and Canada

Thread: ARC Eurotrade
05/02/2014 16:31:44

<done more for carriers than for suppliers>

Undoubtedly . My postman rarely delivers other than things I have bought online.

Delivery charges are often more than the item I have bought.

Thread: Easy Aero Engine For First Timer
06/01/2014 12:44:31

Fellow Aussie Ron Chernich has a lovely model aircraft engine (making and using) web site so point your grandson at that for some reading.

http://modelenginenews.org/

Ron is poorly at the moment so the site is not likely to be updated however there is over ten years worth of monthly writings and contains many gems.

Derry

Thread: It looks like Ron at http://modelenginenews.org/ is gone
24/12/2013 14:38:27

He's poorly, but last time wrote this ..."Although there will be no more monthly editions, there are knobs to twist and levers to pull which will improve the existing presentation, and I mean to twist and pull with a critical eye. And, With no monthly pressure hanging over my head, I find I'm quite looking forward to the exercise. More, as we say, to come......... " so things may happen if he's up to it.

Thread: supercharged V12 2 stroke
07/12/2013 09:07:25

IIRC when MotoGP switched to four-strokes the two-stroke bikes were producing 360 BHP/ltr.

Thread: A Raspberry Pi controlled mini CNC Laser engraver
27/11/2013 15:26:20

I spotted this on the Raspberry Pi website http://www.raspberrypi.org/.

Mini Laser

An engraver based on an DVD drive.

Edited By David Clark 1 on 27/11/2013 19:06:06

Thread: Please don't do aYahoo!
01/10/2013 19:07:53

I don't use twitface so perhaps I am an innocent.

But I have no gripes with the new Yahoo format.

The one thing that is constant in life is change.

Thread: slow rpm, high torque model steam
26/09/2013 17:22:50

I presume you've used a torque wrench Thomas? How would you increase torque with one of those ?

First apply more force (muscle) to the end of the wrench. To do that with a steam engine you would up the steam pressure and increase the area (diameter) of the piston.

How else can you increase torque with a wrench? Double the length of the wrench. In a steam engine that equates to a long stroke.

So in your high torque engine you want high pressure, large diameter bore and long stroke.

If you think about it, with a steam engine you can get maximum torque with the engine stationary, all you need is for the angle between the con-rod and crankshaft to be 90deg.

But like most things in life steam engines are a compromise.

Thread: Universal Grinding machine construction series?
11/09/2013 16:38:55

Diane is Editor of ME and doing her best for her magazine. Bravo!

Should still be in MEW though.

Thread: ME/MEW Articles?
07/09/2013 16:47:36

I'd like to read 1, 3, 4 and 6. Especially 3.

<The magazines employ an editor and a designer; if articles are too long, rambling or unclear then the editor is at liberty to, well, edit! >

Sadly on MEW that doesn't appear to happen, the standard is pretty poor at times. It would help tremendously if the originator submitted their article to friends, colleagues, wife/partner for review before publication. The review can be technical and non-technical.

Thread: Please don't do aYahoo!
30/08/2013 16:41:58

Apparently that page has changed but you only see it if you log in (or something.)

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