Member postings for Donhe7

Posted by John Stevenson on 01/06/2013 12:59:46:

I must be the worlds most unlucky guy.

Went to a car boot sale and all i got was a mini boot lid........................

Posted by Dusty on 13/05/2013 14:50:53:

I don't think it matters if it is a rotary table or an all singing all dancing dividing head. If it was sold as a unit with all parts compatable. It must fall into being 'not fit for purpose' if part of the set up is defective.The plates must fit and be usable on the dividing head/rotary table without modification.

Posted by Graham Meek on 01/05/2013 21:20:02:

The problem with the modern suppressed ignition leads, (pre-engine management days and a coil per plug) was that they had a graphite type yarn core, with the flexing due to vibration from the engine and the extremes of temperature, these items would break down.

It was one of those Automobile manufacturers cost saving ideas that usually cost the mostorist more, in the days of the real Mini these new fangled leads were replaced with good old copper leads and suppression plug caps, fitted once they could be forgot about as long as the outside was kept dry and clean.

Gray,

Regarding the "Mini", here in Oz, it seemed that you only had to hold a PICTURE of a puddle of water in front of them and they would stop!!

donhe7

Posted by peter walton on 16/04/2013 10:16:07:

To get rid of the strobe effrct you will need some capacitance smoothing added.

If the amps are quite high then a lot of capacitance will be needed.

Peter

 

Just a little bit late with my post, I hadn't read the posts following Peter Waltons, and the purpose of my post here has been covered in subsequent posts, so is "surplus to requirements"!!! ............. please ignore it!!

As he is using 24v AC, he would need to rectify it first, then measure the DC voltage (It could possibly be 36v DC, after rectification and fitting of a capacitor to smooth the DC), then adjust the LED units so they have approx. 12v DC across each module, other than that, he would need to fit a fairly substantial resistor in series with the LED units so that their current ratings are not exceeded, with resultant shortening of their life

Posted by Russell Eberhardt on 28/12/2012 14:04:29:

A bit off topic but when I was working at the Mullard research labs in the 1970s we had some special CRTs sent over from Eindhoven for testing. The customs paperwork specified that they should be returned or destroyed after a certain date.

One day a customs officer came into the lab where I was working and asked to borrow a hammer. A couple of minutes later there was a loud explosion from across the corridor!

Russell.

Posted by KWIL on 30/12/2012 09:47:08:

What sickens me about all of this, is that some people think that other people's property should be free ro use, copy, share, give away or pirate. It does not seem to matter that those other people have spend their money and time writing computer programs, music, it does not matter what is is, just let me abuse your rights!

Posted by jason udall on 08/11/2012 01:27:21:

OK how about....

nano parsecs per micro fortnight?

Posted by Wolfie on 02/11/2012 19:48:06:

OK in my day job as wagon driver we regularly have to sheet steel loads. Such as the one in the photograph. Now we are getting trouble from the HSE because it involves drivers clambering around on top of the load trying to handle a heavy sheet often in windy weather and usually alone. So we need to design something that will do this automatically.

Posted by chris stephens on 15/10/2012 19:27:31:

chriStephens

PS if DC1 is reading this, why does the spell checker not recognise "collet", seems a bit odd for an engineering site.

Posted by Stub Mandrel on 11/10/2012 21:55:27:

.. but we can all go out and buy pressure cookers and cappuccino machines made of metals and with construction methods we would never be allowed to use for model boilers...

Neil

Posted by Wolfie on 27/08/2012 16:16:55:

When you buy a taper pin or a taper pin reamer, it only gives one size. Eg 1/8"

Now is that the large end or the small end of the pin/reamer?

Secondly, how do you ream a hole for a taper pin. I'm guessing you simply drill it to the larger size and then use the reamer.

Posted by Eric Clark on 30/06/2012 12:28:47:

Eccentric Engineering of Australia

I have attempted to email Eccentric Engineering alerting them to this as their sales blurb makes no mention of this problem.but their web site contact page will not accept my message as the telephone number field would not recognise a UK phone number even with the usual international prefix.

Eric, I have pasted a copy of your post in the "Contact Us" section of their Website, on your behalf, and await an acknowledgement from them, but it being late on Saturday evening here in Oz, I don't expect a response from them until possibly Monday, but it seems that my email was accepted, we'll wait and see what happens

 

donhe7

Posted by Russell Eberhardt on 29/06/2012 18:44:51:

It is far too generous when it only costs about 5p/kWh to generate it in a nuclear power station which also generates zero carbon emmissions.

Russell.

Posted by Alan Worland on 26/06/2012 21:04:14:

Thanks for that. I think what I have is a grease cup (it did have grease in it)

I have fitted it to the con rod journal which has a very small feed hole into the bearing, I shall fill it with oil and run it on compressed air to see the quantity of oil used, I could fit it with a wick to slow feed rate down if it all flows through too quickly.

I like the idea of the cup on the crank end, this could be used for all crank bearings I guess.

In hindsight I think oil might be more suitable than grease?

I think a lot of small steam engines seem to have lubricators for main bearings etc but the big end gets forgotten about!

Alan

Posted by Alan Worland on 25/06/2012 22:10:37: a suitably sized oiler with a screw cap which would be capable of retaining a more generous amount of oil.

Would it be better filled with grease and given a part turn every so often?

This method was used in a full-sized stationary engine which was built by IHC in the 1920s, which used a deep "grease cup" on the end of the crankshaft, from whence the grease was forced through a passageway to the big end , a periodic "pat" on the end of the grease cup would keep things lubricated.

The grease cup could be removed while the engine was running as required, by quickly spinning it between the hands faster than the slow-running engine was rotating, and replaced VERY carefully, after refilling.

donhe7

Posted by Ian S C on 22/04/2012 13:27:07:

As bike dynos go, a Sturmy Archer hub dyno would give you the most power output, you need to find an old junked bike, think they were about 9V, were as the ones that run on the tire are 6V, the hub dyno gives a good voltage at a fairly low speed, they all need a rectifier, but thats not much of a problem. Ian S C