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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: Dykem Pens
25/07/2021 21:39:03

If the engineer's blue is spotting blue, then it's no good for layout work (it won't dry). If it's prussian blue mixed with shellac, then it's the right stuff. Alcohol or acetone works as a solvent.

A pen for it would be a struggle because it'll tend to dry out on the felt tip and need re-wetting to get it to work again.

A paint brush sealed into the lid of a bottle or jar, and kept submerged during storage works very well, as does a sheet of paper shop/kitchen towel rolled up tightly and dipped into the bottle (re-wet or use another next time).

Thread: Listed on ebay as easily repaired
24/07/2021 17:48:09

Probably why it got dropped then, someone tripped over with it in the dark.

Thread: ML7 lathe bed
20/07/2021 19:46:08

At 60 years old, she shouldl be narrow guide. In that case, the rear vertical is unused and can be used as a datum.

Thread: GigaFactory
16/07/2021 11:21:53

Bah! Humbug!

It'll never catch on. We'll always need the stables and the farriers.

In a way, it's a good thing that those who practice model engineering tend towards the old and decrepit, because many of the posts on this thread seem to think that progress is totally impossible.

I'm 63, when I was a kid, on average only one in four households had a motor car. if one wanted to drive from one end or side of the country to the other, it was quite probable that one would be travelling on the Fosse Way, Watling Street or Ermine Street etc. for some or all of the trip.

Things move on. The world can't afford for us to keep burning fossil fuels at increasing rates as if there were no consequences to such actions.

If you can't accept the change, stay out of the way!

Edited By Mark Rand on 16/07/2021 11:23:10

Thread: Powder coating quality of finish
11/07/2021 14:33:02

Re the corrosion:- Single coat powder coating is almost the worst process to use for long term corrosion protection if there is any chance of damage to the finish. Once there is a puncture in the coating that water can enter, rust will spread out from that point and lift the coating. As in, the Meriden Triumph spine tube motorcycle frames, which were powder coated very heavily and then had the frame number stamped on them.

Powder coating companies should offer to use a zinc primer layer for anything that is going to be outdoors or subject to damage. If they don't offer it up front, ask for it. My local coaters have been very good in that way.

10/07/2021 20:57:25
Posted by Sam Spoons on 10/07/2021 20:14:27:

It's light for a MTB at just over 10kg (the Orange is nearer to 14kg).

Same weight as my Reynolds 531 Dawes bike in 1974, although that was a road bike and five speed. cheeky

Thread: Chinese drip feed oilers
10/07/2021 20:50:29

The RDG and Amazon ones are almost guaranteed to be the same as the AliExpress ones, so will be the same or similar in performance and quality.

If you aren't happy with the possible risk, there's always the tried and trusted AdamsLube.

Thread: Drill sharpening?
08/07/2021 18:31:31

I've got a second hand drill doctor that produced passable results for a while before it started producing zero and negative relief grinds. I've also got a Picador Fig 9 jig that can produce good results when set up precisely, which takes time. Both have the limitation that they only go up to 3/4". I'm not interested in offhand grinding.

What I have been doing it pottering about with the cad program to sort out what's needed for a double size Duplex drilling jig based on the 1951 ME articles. To be honest, it'd be simpler to just make the bits to twice the given dimensions, but it's also an excercise in learning Alibre. smiley

Thread: re-magnetising magnetic base
07/07/2021 20:39:14

I have a 3"x3"x4" magnetic V block, the Alnico magnet of which has lost most of its strength (the reason it was scrap at work). I bought five wickedly powerful NIB magnets and have plenty of aluminium and steel to make a new rotor for it.

I'm still short of the round-to-it that is neccessary for the repair job.

Thread: Split cotters
03/07/2021 19:56:21
Posted by John Baron on 03/07/2021 18:09:17:

As far as a diameter for the cotter is concerned a larger area for the clamping surface simply means that the force required to lock a shaft is less than a small area.

Friction is a function of force, not area. A larger area won't make any difference.

Edited By Mark Rand on 03/07/2021 20:01:46

Thread: Which grease?
01/07/2021 19:15:17

You don't say what the lathe is, but the comment about Mazak nuts points towards a Myford. If that's the case, wind the cross slide and top slide out most of the way, then use the spout of an oil can to lubricate the screws from below.

Thread: ‘Right to Repair’
01/07/2021 10:14:19

Providing parts retailers can get the OEM parts from the manufacturer, there should be no problems. 30 years ago I ordered washing machine spares from the shop the machine came from because they had an account. Now I go online to buy spares.

Thread: How Elgin made Jewels for Chronometers
24/06/2021 16:01:20

Post deleted because it was more thread drift about poisons and stuff from a sexagenarian. laugh

Edited By Mark Rand on 24/06/2021 16:28:59

24/06/2021 12:25:53

I apologise, you are quite right. I don't know why I come across as an opinionated bottom (Unless I am one!). I should have remembered that Schoolfriend Keith Ayres's dad, who was a watch repairer, used benzene to clean watches in the mid '70s, Even to the extent that wiseguy me told him that it was poisonous!

23/06/2021 11:44:19
Posted by Ady1 on 23/06/2021 08:20:22:

Fascinating and Exhausting to watch the huge number of processes

Elgin watch company

"The operator puts a squirt of benzene onto the surface to stop the jewels sticking"

benzene is as nasty as it gets and should be totally avoided

Benzine, not benzene. Different product entirely

Thread: Cutting an exact diameter using a carbide tip.
12/06/2021 22:43:18
Posted by fizzy on 12/06/2021 21:25:13:

Andrew - have you spotted your deliberate error? LOL

 

It might be that he's got a lathe like my Hardinge that is calibrated in diameter rather than depth of cut. cheeky

 

The optimum depth of cut of a CCMT06040X insert is just under 6mm/.25" otherwise you're paying for a lot of insert that you aren't using...

 

Edit:- deleted inappropriate comment .

Edited By Mark Rand on 12/06/2021 23:00:27

Thread: What V belt cross section for use on a standard sized Picador pulley
10/06/2021 13:25:42

Could be any section that was ever made. Picador made a lot of pulleys,

belt-sections-sizes.jpg

Thread: Into the darkness
09/06/2021 19:41:54

I'm more than a bit narked about the plan to ban fluorescent tubes in the near future. LED tubes have, pretty much, exactly the same lumens/Watt as T8 triphosphor fluorescent tubes. The only ones that even claim a better output only emit over 180° of their circumference.

Thread: Hinckley C
08/06/2021 19:08:08

We'd have had a dozen new nuclear power stations if some bunch of pirates hadn't dismantled the CEGB and flogged off its component parts to Other nations' companies. It was called asset stripping when Tiny Rowland did it. it was called privatization when B****y Thatcher did it. angry 2

Edited By Mark Rand on 08/06/2021 19:12:33

Thread: Best place to buy materials
08/06/2021 18:59:40

This is another reason why it's a good idea to put your location in your profile or at least, mention it in your post. Without that, people cannot offer help as to local suppliers.

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