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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: For all you Myford owners
28/06/2022 18:08:39

On the comments about the poor perception of flat ways compared with prismatic ways, I'd suggest that the 80 tonne capacity flat bed Waldrich Seigen at work was a far better machine than the two prismatic way Ravensbergs. laugh

It was a bit bigger as well,

V-flat and prismatic bed lathes are poorly suited for milling, which was a major capability for the 7 series.

Thread: THE MIDLAND - THE ONLY SHOW IN TOWN !
28/06/2022 12:24:33

Twelve miles each way. I'd be a fool not to invest in a litre and a half of Diesel, wouldn't I?

Thread: Telephone Ringback Code?
23/06/2022 17:56:52

Do you know what the combined REN (Ringer equivalence number) or the impedance of the combined phones in the property are? The standard allowance for BT landlines was 4, which equates to an impedance of 1000 Ohms. Can you selectively remove phones from the network until you get a ringing working?

Thread: There are locomotives.... and there are locomotives.
23/06/2022 10:22:50

While we're nitpicking, It would have been so much simpler and more elegant to have made slip eccentrics as used on some gauge 0 locos than the belt reverser. crying

Thread: All things Beaver Mill
20/06/2022 12:33:04

Need a ventilation cowl on the roof, just above the spindle. laugh

Thread: Edge finder lubrication
19/06/2022 21:15:58
Posted by Nigel Graham 2 on 19/06/2022 17:09:11:

I'm not sure about Mark Rand's "anything toxic" remark though; and his cleansing of everything in acetone. Toxic to him or to the edge-finder?

As far as I'm concerned, WD40 and 3-in-one oil are products that have no place in any workshop as lubricants. They both end up, after time, leaving a sticky mess that defeats the functioning of any fine mechanism.

If you want something that doesn't gum things up, you need something that is pretty much all straight alkanes. Try PlusGas for very low viscosity, medicinal paraffin or hydraulic oil for higher viscosities.

Thread: Thoriated tungsten electrodes
18/06/2022 19:44:04

In the early '80s we had 400kg of mercury in the stores, but we had stopped using manometers for flowmeter and condenser vacuum measurements in steam turbine performance testing.

I proposed to our management that we should sell the mercury, since it was valuable, but we had no further use for more than about 20kg of it. I was informed by a very unimpressed departmental manager that the company as a whole would get the benefit and that neither the department or our small section would see anything from it, other than the hassle of the sale. So it was not allowed.

A decade later, a large sum of money had to be paid out to dispose of 400kg of toxic waste!

Thread: Edge finder lubrication
18/06/2022 15:16:12

Absolutely nothing. That seems to work very well with my edge finders... If they got contaminated with anything toxic, like WD40, 3-in-1 or similar, they'd get cleaned with acetone, then allowed to dry.

 

Note:- my shed is dry and has a stable temperature.

Edited By Mark Rand on 18/06/2022 15:17:01

Thread: 13G?
16/06/2022 09:34:24
Posted by Hopper on 16/06/2022 06:36:18:

But those foreign johnnies would struggle to work out the standard Whitworth system anyway, being born and raised on the entirely rational metric system!

Ah, but they will be familiar with the concept, since they use BSP for their metric standard pipe fittings! surprise

Thread: Engine scale
12/06/2022 20:30:01

For a 10" swing lathe, without a gap-bed, you are probably looking at a 1 1/2" to the foot scale for most traction British or European engines engines. That's to be able to turn the hind wheels. If they aren't a problem then 2" to the foot should be well within the capability of the lathe,

 

Note:- I haven't made a model traction engine, even though I've got a set of 1" Minnie castings.

 

Note 2:- I type too slowly. laugh

Edited By Mark Rand on 12/06/2022 20:30:49

Thread: Fiber optic cable
12/06/2022 20:21:54

Actually, .The outside diameter of the cladding will be 0.125mm. The fibre itself will be 0.05mm for multimode fibre (good for a few hundred metres) or 0.009mm for single mode fibre (good for kilometres).

Thread: Telephone Ringback Code?
11/06/2022 19:35:09

As I stated in the fourth post. The ringback code (simple, not the full diagnostic menu) is 1475. That is for BT though...

Edited By Mark Rand on 11/06/2022 19:38:51

Thread: Curiosity about an Aldi belt sander
11/06/2022 19:28:27

Coming a bit late, but I'd suggest the Bosch PBS75A, except that they've cheapened the design slightly over the last 15 years and I don't know it it's as good as the original.

The GBS75AE is the one to go for. Built like a brick outhouse and with easy spares and accessories availability.

Thread: Telephone Ringback Code?
11/06/2022 12:11:50

1475

laugh

Thread: Connah’s Quay Power Station
11/06/2022 09:51:35

The significant thing about the units is that they were the first single shaft combined steam and gas turbines. The gas turbine is at the front and the steam turbine part is in the middle, with the generator and exciter at the back. The heat recovery boilers in the chimney stacks take heat from the gas turbine exhaust to provide low pressure steam for the gas turbine.

There was a bit of a problem during early commissioning. The units had been run for long periods with just the gas turbine providing power and no steam going through the steam turbine.

Even with the condenser air pumps running, there is still some pressure at the condenser end of the steam turbine. With no steam flow, there was no cooling of the last row blades. Some blades left the turbine... The LP cylinder end-bells were a bit of a state when they came to Rugby for repair.

Thread: pyrex is not PYREX
09/06/2022 08:59:42

This has been the case for a number of years. In the UK and EU, you'll find PYREX borosilicade kitchenware. In the US you'll find pyrex tempered soda lime kitchenware.

Thread: Mill Bolt Source?
06/06/2022 19:12:31

EN16T is the stuff to use but If I made it, it'd come with a 3/4" AF head, because that's what I've got.. smiley

Edited By Mark Rand on 06/06/2022 19:14:19

Thread: Hardening clock pinions in EN8 steel
06/06/2022 10:30:45

Given the amount of time involved in making the pinions, I'd be tempted to buy a small length of EN24T rather than using EN8 just because I had it.

I now use my wife's pottery kiln for tool steel hardening because it's got a good programmable PID controller and temperature measurement, but that's just because it's there and she lets me use it (if I ask very nicely).

The hardening temperature for EN24 is 830-850°C and this is just a little over the melting temperature of table salt (801°C), so one can use that as the heating medium. Doing so and moving the part directly into an oil quench will also eliminate scaling. The downside is that the fumes from the salt have a tendency to make nearby items go rusty. I used this method to harden all the gears and shafts that I made to rebuild the apron gearbox on my Hardinge HLV

Thread: Warning buyer beware
04/06/2022 18:52:09

Description and photographs in the relisted item seem reasonable.

04/06/2022 14:02:49
Posted by Howi on 02/06/2022 10:08:20:

This is where the Chinese have found the loophole, PayPal states the item MUST be returned to the seller and you MUST submit proof of posting and seller MUST state that the returned item has been received.

PayPal will, actually, reimburse your postage when you return an item. The problem is that the limit is/was £15. This is too little even for a return to Europe, let alone to China. Discovered this when I bought a Roomba replacement battery from Belgium that wasn't accepted by the machine.

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