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Member postings for Russell Eberhardt

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

Thread: 2D and 3D Cad Software Recommendations
23/06/2021 09:51:30

+1 for Onshape. I have used Solidworks in the past (before retirement) and I find Onshape similarly intuitive to use, being produced by a group of ex Solidworks people, so I might be biased. It is free and shows no signs of disappearing after six years or so. It will export STL files for 3D printing and create 2D drawings from the model.

The only downside is that, being browser based it can get rather slow for complicated models. I have however managed to import a complete Antikithera mechanism into it so it will certainly handle most of our needs!


Thread: 2.5mm thick mystery 'Formica' type sheet. Is it still available?
14/06/2021 10:43:16
Posted by Robert Atkinson 2 on 13/06/2021 21:08:16:

If it is for an RF window I'd be wary of decorative materials. many of them are lossy at Radio Frequencies. A particular problem is melamine. It is very lossy at RF and is used a a facing material in formica and similar. Depending on frequency the phenolic board I linked to earlier may be OK.
Fibreglass epoxy board like that used for circuit board bay be the best material. Obviously you don't want the copper clad version

Names for this are FR-4, G10 and Tufnol "Glass". G10 at least is available in black.

Robert G8RPI.

Edited By Robert Atkinson 2 on 13/06/2021 21:09:02

For RF transparency I would avoid any black plastics as the common pigment used is carbon black which will make it rather lossy depending on frequency. For making printed UHF antennas we used to use clear high impact polystyrene but I guess that is not what the OP wants.



Thread: Machin guards
13/06/2021 16:24:05



Thread: Blueish steel
31/05/2021 10:34:32

I've found Abbey blue gel to be effective and long lasting. I've used it on an old Laguiole David knife that a visitor had put in the dishwasher and removed the original blueing! After use they should just be wiped down with a drop of red wine to clean and sterilise them. Just dip your finger in the wine that accompanied your steak!


Thread: College Engineering Supply Castings Alternatives?
19/05/2021 16:38:40

When I bought my first milling machine, about 17 years ago, I followed Harold Hall's "Milling a complete course" and found it very instructive. The first project after making T-nuts was an angle plate, again using the CES castings. While buying chinese angle plates is quicker and cheaper that doesn't give a beginner the same experience.

I commend the OP for trying to take that route.


Thread: Porsche 951
12/05/2021 09:49:54
Posted by Peter Seymour-Howell on 11/05/2021 18:34:30:

One of the secret weapons on this engine, the two balance shafts that give this big 4 pot the same smooth running as a straight 6.


Not much of a secret. Lanchester used that idea back in the 1930s they even used it with the shafts geared up to remove vibration harmonics on six cylinder engines.


Edited By Russell Eberhardt on 12/05/2021 10:03:46

Thread: Advice on removing column from mini-Mill
10/05/2021 10:21:41

If it's the X1 type mill the column should come off O.K. with the nut removed. I would try a bit of penetrating oil and work it up and down a bit as you pull. ARC have some dismantling guides on their websites for their versions that might help.


Thread: Ropey Radio Reception?
10/05/2021 09:04:46

Unfortunately very few FM radios are fitted with a proper aerial socket and the built in whip aerials are woefully inadequate. For best operation a whip aerial should be 1/4 wave, that is about 75 cm, long. The other problem is that in a house the signal will come from multiple paths each with a slightly different delay and interfere with each other. For compact reliable reception a WiFi receiver of some sort is much more reliable and easy to set up.


07/05/2021 10:37:32
Posted by Nigel Graham 2 on 05/05/2021 17:50:41:

Also I tend to rely on the radio for verifying my clocks and watches - have they sorted out the problem that DAB radio notoriously delayed reception?

If you have an Android phone or tablet the "ClockSync" app gives you clock time derived from NTP with better than 10mS precision. Alternatively there are GPS time apps but they (only !) give 300 mS precision due to deficiencies in Android.


05/05/2021 15:36:38

I have suffered similar problems for years with my FM radio alarm clock. Some days good reception of our local (about 15 km away) radio station other days reception would come and go as I walked about the room. DAB is not available in this area.

I spent about £40 on a Google Nest Mini and told it to set a daily alarm for 7 AM and play our local station. I can also use it to play any one of thousands of radio stations by just saying "Hey Google, play BBC radio three" for example. The sound quality is much better than I expected from such a small device but if I want real quality I can cast to my TV which outputs sound to my HiFi.


Thread: Reading glasses - frosted area
04/05/2021 11:03:09

If they are glass, use jeweler's rouge. If Acrylic use Perspex polish but note it's not suitable for polycarbonate.


Thread: Subscriber only content - can't access
03/05/2021 15:20:22

Just received a new subscriber number by email. It now works thanks.

Still can't figure out why it stopped working while the website showed that I still had about three weeks left of my subscription.


Thread: My new computer
03/05/2021 10:35:27
Posted by Nick Clarke 3 on 03/05/2021 10:17:30:
You don't have to buy Windows, you don't have to use Talk Talk - but if you wish to do so there are strings attached which are rarely negotiable

It's difficult not to buy Windows if you are buying a new computer. Very few vendors sell them without it so you pay for it even if you don't want it.


Thread: Subscriber only content - can't access
02/05/2021 09:23:36

O.K. Thanks and have a good bank holiday.

01/05/2021 22:06:14

Thanks Jason,

Yes, the ME one expired a few years ago. The MEW one was due to expire just before the end of May so should still have been valid, however I renewed it yesterday and still have no access to subscriber content.


01/05/2021 10:24:42

Yesterday I tried to read the latest MEW issue on this site as I haven't yet received it in France. When I click on Magazines in the top menu bar I am told that it is subscriber only content but I AM a subscriber and have been for many years.

My subscription was valid until the end of May but as the renewal date is not far off I decided to renew it anyway in case the date was a problem. After some trouble with the Captcha on the subscription site thinking my computer was giving automated responses I eventually got my subscription renewed.

I tried again and still no access to magazines. I checked my profile and it still has my subscription number entered so no problem there.

I can access the magazines on Pocketmags but I find the web preferable.

Can someone help sort this out?


Thread: pigeon timer
28/04/2021 09:14:58

Yes they are expensive for a one off job. You could try making one yourself. As you are not meshing with an existing wheel you could use involute gears I seem to remember John Stevenson published a method for making cutters some time ago.

Meking cycloidal cutters is described here at length: making-clock-wheel-pinion-cutters


27/04/2021 09:34:58
Posted by duncan webster on 26/04/2021 21:58:58:

The existing set up is 26:52 and 6:72. If I replace the 26:52 with 39:39 I get the desired result. As near as I can measure the centre distance is 21.26mm. Not easy to measure, so might be a bit off. The gears appear to be cycloidal

If I use divide 21.26 by 39 I get a module of 0.545mm which doesn't sound right, but if I try 40 dp I get a centre distance of 24.76, which is equally unlikely. Can anyone point me in the right direction?

Clock wheel and pinion cutters are made in increments of 0.05 module so 0.55 is what you are looking for. You can buy them on line from Meadows and Passemore.


Thread: B&D workmate
26/04/2021 10:35:30

I still have one of these. Bought in the early 70s. The diagonal bracing makes it much more stable than the modern ones.


The bench top is high quality 13 ply, doubled up at the clamping edge. None of your MDF here!


Thread: Small saw. Proxxon or something else
22/04/2021 13:57:49
Posted by JasonB on 22/04/2021 11:54:05:

Thanks for the 32 tooth correction.blush but that is still three thicknesses of metal to one tooth so you won't get 2 teeth in contact or even 1 on the 0.1mm material.

Yes you are right of course I must have shifted the decimal point. I claim old age sad


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