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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: Carbide Parting inserts
31/01/2014 23:26:10

The main reason for carbide parting inserts grenading is that they mustn't be below centre. If they're below centre at the end of the cut, the work climbs up over them and simply pulls the end off the tip. A few (up to 4) thou above centre will protect the tip unless you're on a really rigid setup, when you can use less. Then They'll cut very well.

Thread: Workshop Heating
21/01/2013 22:08:48

My 30 m^2 shed was built with 6" Structural Insulated Panels for walls and roof. They've got 5" of PU foam inside them. The 8" concrete floor sits on top of 4" of polystyrene foam. Base contains 14 m^3 of concrete. Inside temperature changes by no more than 3°C per day in boiling or freezing weather, if I don't use the shed. Currently the lights, plus me, plus the machine tools I use in the evening are keeping it at 14°C with the outside temp at -3. In summer I have to open the door or use the air conditioner...

 

Shed construction

 

This isn't a gloat. Ruddy thing cost me more than the house did and took two years to build, just showing that insulation and thermal mass really make a difference.

Edited By Mark Rand on 21/01/2013 22:09:58

Edited By Mark Rand on 21/01/2013 22:11:24

Edited By Mark Rand on 21/01/2013 22:15:48

Thread: Announcement from Arc Euro Trade Ltd.
23/03/2012 23:23:24

Resurecting an almost dead thread:-

How's about having Gert sell tools and consumables from the van in the car park?

Thread: New Blocks on the Block
06/12/2011 23:33:23
Very late in the thread, but...
 
John S, What's the potential advantage/disadvantage of 1-2-4 over 1-2-3? I can see that 1-2-4 is a nice binary ratio and makes for less blocks to make a stack of a given height, but does it offer any advantages when making temporary jigs?
Thread: What happened to the Myford sale thread?
21/07/2011 23:58:55
Since "Price Includes VAT!!" and a large number of lathes are being sold, it may be assumed that "myfordlathes" is a business, or is acting as one.
 
This raises the interesting feature that the sales are also covered by the Distance Selling Regulations and the Sale of Goods and Services Acts. This is because they are buy it now, instead of auction type sales.
 
It would be good to get that recognised by them before parting with any money.
Thread: Rust and how to remove it.
16/07/2011 23:46:40
John,
Are you sure you haven't got that arris-about-face?
 
In the experience of most folk (me included) Hydrochloric acid fumes will rust anything in the same building in short order. So will fumes from a common salt hardening crucible. Phosphoric acid, in contrast, is relatively benign. Indeed, I've had a plastic dustbin full of (originally) 10% phosphoric acid in the workshop with a fish tank aerator in it for the last three weeks, evaporating the excess water so I can put it into a smaller container. it hasn't caused any corrosion problems at all.
 
On the other substances, Evapo-rust, molasses and to a lesser extent, citric acid, act as chelating agents. They will capture the iron oxide molecules and float them off. Gentle scrubbing with a wire brush every day will help the process.
 
Hydrochloric and phosphoric acid will both reduce the iron oxide, but both will also dissolve iron as well.
 
Electrolytic cleaning with sodium carbonate (washing soda) as an electrolyte will reduce the ferric oxide (rust) to black ferrous oxide, making it easy to brush off. Eventually, it'll reduce the ferrous oxide too.
 
 
Having tried all these methods, I'm currently a convert to diluted molasses, I hauled a milling machine table out of a 12"x56" pool of it in the workshop yesterday after two weeks of soaking. It's a lot slower than the other methods, but it seems to do the job very well. Makes the shed smell interesting too
 
Thread: What happened to the Myford sale thread?
14/07/2011 22:29:01
Posted by Tigertrev on 14/07/2011 20:27:58:
Tomfilery
 
'Mark' is the author of the italicised article I copied into the post so he's not likely to get your message. Sorry, I can understand the confusion in my post.

Trev
 
Yes, that was me in uk.rec.models.engineering. I had called them at lunchtime today about a new leadscrew. Second-hand stuff, completed machines and most of the plant were still available, but the staff no-longer had access to the stores.
 
Mark Rand
RTFM

Edited By Mark Rand on 14/07/2011 22:29:59

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