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Member postings for Mark Rand

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

Thread: How can you check that DVLA field of vision machine is OK.
24/04/2021 20:35:34

On a side note:- the minimum acceptable visual acuity is 6/12 for normal licenses and 6/7.5 in the better eye for lorry drivers. Many opticians and hospitals use reduced size eye chart at 3 metres distance. This really winds me up because my varifocal glasses are optimised for things such as keyboard use, screen use and distance use. 3 metres is not their optimal range, but 6 metres, as specified, is well within it.

Bah Humbug! angry

Thread: VAT changes post Brexit
20/04/2021 09:01:59

Thanks for that. I might have to raid the piggy bank for some replacements now!

Thread: Gear
18/04/2021 21:42:03

The reason that Hardinge (and some others, like Beaver) liked 22DP, at least for rack gears, is that the pitch is within .04% of 7tpi, Thus is quite useful for linear calibrations.

The other thing is that Hardinge didn't use a plain 22DP gear, they used 22/29 stub form gears (pitch 22DP, but with the height and depth of 29DP gears), so the diameter is less than one might suppose.

PS:- Pete. I really must get back to you about gearbox cover castings. I've been a bit distracted over the last several months and have kept putting it off. crying

Thread: Trademark Infringements
17/04/2021 19:05:30
Posted by noel shelley on 17/04/2021 11:02:13:

The OP does not say why he wanted, or needed a cert ? Just because he could or for a real need for one ? I had to get a part made that had to be as per original spec. The first task was an analysis of the material of the original part - this alone cost many £00s - in fact it cost as much as the manufacture of the part.

SO if you need a REAL cert expect it to at least DOUBLE the cost of the material. Noel

My original query to the seller was:-

"Dear *******,
What grade is the cast iron? Will you supply Mehanite certification with it?
- mark_rand ~

When I buy stock, I tend to buy specific alloys for specific tasks and would like the seller to at least identify the alloy they are supplying.

17/04/2021 09:37:12

Part of my point is that "Grade 250" cast iron is a BS1452 grade. It isn't any Meehanite grade that is made or licensed.

If the product were what it is purported to be, it would at least have the correct name.

Search for "Meehanite grade 250" and the only hits you get will be for UK model engineering suppliers...

Bah! Humbug! I'm off to eat a slice of Cuthbert the Caterpillar cake with Bramwell's pickle on it.

16/04/2021 22:10:08

There is a seller of steam related products in the Western part of the country that advertises on EBay. They consistently advertise continuous cast cast iron bar as 'meehanite', but when asked for certification or provenance cannot supply any, just say words to the effect of:-

"Hi, it is grade 250 cast iron and we do not have certification to send with it.
Kind regards

This winds me up more than a little bit, since the Meehanite process is more than a little bit specific, and only licenced by the Meehanite Company.

Thread: VAT changes post Brexit
14/04/2021 12:49:24
Posted by Michael Briggs on 14/04/2021 09:51:49:

I received a toolholder set from PeWeTools last week. The charges levied were 2.5% import duty and 20% VAT.

Did Peter/Pewe sell them without the VAT at his end?

Asking for a friend...

13/04/2021 19:59:27

VAT and/or import duties will be levied.

Got clobbered by this when the manufacturer sent some correctly working devices as a warrantee fix for equipment that had a fault without requiring the originals back.

Thread: Loctite or Draper? Much difference?
11/04/2021 20:31:34

There are sellers on fleabay who will ship 50ml of loctite 542 to italy for £25. I would have thought there would be local sellers who could match/beat that price.

Thread: The Workshop Progress Thread 2021
04/04/2021 21:19:49
Posted by Pete. on 03/04/2021 20:24:21:

Nearly finished my little press, need to cold black the new ratchet mechanism parts I just machined, and the new handle, just need a few broaches now.

Without the gas bottle by it's side, I'd be looking on the Stuart models website for the castings for that.laugh

Edited By Mark Rand on 04/04/2021 21:20:07

Thread: Magnetic bases - stored on or off?
04/04/2021 21:15:39
Posted by Simon Williams 3 on 04/04/2021 00:02:35:Magnets not made with rare-earth compounds are prone to losing their flux intensity (de-magnetising) if they are left open circuit ("ON" in this application) and without a keeper (Old Mart's bit of steel stanchion). But that goes back to the dark ages, and any magnetic stand made in the last (say) 60 years is not going to be made of materials with such a significant design weakness.



Actually, the situation isn't as good as that. I've got a very good Eclipse magnetic square that's not particularly magnetic at all. The AlNiCo magnet in it has lost most of its strength. It's on the to-do list with a selection of suitably sized NiB magnets and a block of aluminium for a carrier to re-power it. I have a number of other magnetic indicator stands that could probably benefit from the same treatment.

Basically NiB or samarium cobalt magnets will survive anything except being in a fire. Ferrite magnets (the dark grey ones), often used in welding clamps, aren't as strong, but will survive anything but shatter when dropped. AlNiCo can be as strong as the rare earth magnets, but have a low remmnance, and loose much of their strength the second that they are 'open circuited'. There are still quite a few mag bases etc. on the market with the latter magnets inside them.

Edited By Mark Rand on 04/04/2021 21:16:51

Thread: Mist Coolant (Fogbuster)
06/02/2021 10:00:17

Smith and Allan sell one at £125/20litre but that quantity might be more than you want.

Thread: Air Compressor Warning
31/01/2021 21:25:58

On the topic of the incompressibility of water. There was a bang and a rattling noise in our development office one day when I was beavering away. one day. A steam turbine cylinder was undergoing an hydraulic test before assembly and a 1/2" BSP blanking plug blew out of its hole. Went straight through the wall into the office...


Water isn't all that compressible (unlike oil) but steel is sufficiently expandable to store up a bit of energy under the wrong circumstances.

Edited By Mark Rand on 31/01/2021 21:27:37

Thread: Venturi calibration
31/01/2021 21:19:48

Beg, buy, borrow or steal a look at BS1042.

It'll tell you what you need to know.

Thread: So Much For CE Labels!
28/01/2021 19:37:51

My thought had been that, if the product was for the GB+Ulster market, as stated, and if there was an applicable British Standard, then paying for the inspection and license fee for the BSI Kitemark was a valid method.

Thread: Paint, what types available, most durable
27/01/2021 22:14:24

As Nicholas says, the 2-pack automotive paints are very robust and give good results when sprayed.

Whether you go for conventional enamel/alkyd resin or a 2-pack, it's a good idea to be careful about the use of high build primers. They can give a very flat finish with sanding, but the reason they are easy to sand is that they have a lot of talc filler and not much resin, so they chip easily. It doesn't matter how good the colour coat is, if the primer is thick and soft, the paint will chip.

The other thing is, whichever system you go for, it really can be a good idea to leave it alone for a month before putting the saw into use. Both 2-packs and alkyd resins do take a while to gain their ultimate hardness. Not so much of a problem with a car, but worth the wait for tools.

I discovered both of those after I rebuilt and repainted of my Hardinge HLV....

You should be able to get any RAL or BS standard colour mixed for a reasonable price.

If you are feeling cheap, use hammerite. cheeky

Thread: Smart Meters & temperature/BA thread size relationship
27/01/2021 16:20:06

Not unreasonable after 25 years of service, but if you look on the data plate, you will normally see that it states "class 2", that's what it was manufactured to,

Thread: So Much For CE Labels!
27/01/2021 16:05:57

Assuming the proper standards have been met, apply for and use the BSI Kitemark?

Thread: Smart Meters & temperature/BA thread size relationship
25/01/2021 19:57:23

They are becoming available since mid 2020

25/01/2021 17:22:09

VARs are not charged for in UK retail electrical contracts. End of.

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