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Member postings for Rod Renshaw

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

Thread: Lidl Portable Bandsaw
22/10/2020 15:37:42

I have the Aldi £160.00 bandsaw and I am pleased with it. Mine is branded "Ferrox" and the vice and blade on mine seem okay. I used to have a 6 X 4 bandsaw and the Aldi one cuts as well, including on steel, but it can't be left to get on with cutting unattended as you have to keep the trigger switch depressed. I don't expect very accurate cuts but it seems good of it's type. The Lidl one seems essentially similar to the Aldi from the photo except that the plastic handles are different, mine has mostly hex socket screws rather than plastic handles.

Rod

Thread: Good YouTube videos
21/10/2020 18:20:41

"Tubal Cain" was the pen name of Tom Walshaw, a professional engineer and academic, and a very expert and prolific contributor to ME, and also author, until his death in 1998.

Since his death someone else has adopted the name ( which is a biblical reference) to make uTubes etc., I don't know anything about the new guy.

Rod

Thread: Evolution rage2
18/10/2020 21:00:33

i bought one of the £150.00 Aldi band saws and have been very pleased with it. It's fairly quiet, does not throw swarf about and it has variable speed for different materials. I have bought spare blades from Tuff saws but not yet had the replace the original blade. There was at least one thread on the forum on these saws, about 2 years ago. it was an on line -only offer, not sure if they still do them.

Rod

Thread: ME Fastener Suppliers?
18/10/2020 20:42:07

EKP list 10 BA steel studding

Rod

Thread: Drop on recoil escapement
16/10/2020 21:21:18

+1 for the video. I am not a clockmaker but I have often wondered how an escape wheel gave impulse to a pendulum. it is obvious that it must happen, or the clock would stop, but I found it difficult to understand how from drawings.. The slow motion of the video makes it all very clear.

Rod

Thread: Dressing a diamond wheel
15/10/2020 16:44:09

I think I read somewhere that diamond wheels should only be used to cut carbide and that using them to cut HSS will result in the steel in the HSS "eating" the carbon out of the diamonds, some sort of chemical reaction. I think this only happens at high temperature so that using a diamond slip or "oilstone" on HSS is okay. If true this is clearly important to bear in mind if changing from stone to diamond.

Anyone else have information about this?

Rod

Thread: Gear Train noise?
15/10/2020 11:31:22

All good stuff on reducing the gear noise at source.

When you have done all you can to reduce the noise you can sound insulate the cover to some extent. Thermal insulation products are not really effective - to deaden sound you need something heavy!

There are heavy sound deadening mats for reducing engine noise in cars and, as suggested above by Nicholas, you can used lead sheet. The thicker the better, wrapped or moulded to fit inside or outside the cover and with as few holes or gaps as possible.

Rod

Thread: Home Automation Technique
09/10/2020 09:47:40

Might need expert advice about this.

The temperature of the air inside and outside also matters. Warm air can have a lower relative humidity than colder air while at the same time holding more water. so any control system may (will?) need to factor the temperature difference in as well as the relative humidity.

A friend had a similar problem and during a spell of warm dry weather he ventilated his cold damp basement and found it getting wetter! this counter-intuitive effect is apparently because the warm outside air, which seems dry, can often contain more water as vapour than the same air can contain when it is ducted into a cold basement, so the surplus water condenses out.

 

Rod

Edited By Rod Renshaw on 09/10/2020 09:53:08

Thread: Whitening
07/10/2020 20:41:04

Emgee,

Thanks for posting that link, I had not seen it before and found it very informative about issues beyond piston rings.

Rod

Thread: Looking for a very small lathe.
06/10/2020 12:24:11

There is a website called "Adventures in Watchmaking" in which the author describes in almost poetic terms his work to make a watch from raw steel and brass stock on his Cowells lathe, a very superior machine, handmade in UK. Lots of lathe etc techniques to learn from, imagine making a watch!

Rod

Thread: Odd Spanner
03/10/2020 13:09:54

+1 for the Ideal Home Exhibition special. Worked OK for a time but snapped when it met a tight nut, and not really missed as it had a tendency to chew up the nuts.

Rod

Thread: 5BA Threads
02/10/2020 17:07:33

Thanks to everyone who contributed links to suppliers and thread tables to this forum thread, I now know of sources of supply I was unaware of.

Rod

Thread: Ball bearings and friction.
02/10/2020 11:10:42

Would bigger balls, with more stored kinetic energy ( cf big flywheel) extend the run time?

Rod

Thread: White rock salt
02/10/2020 10:56:04

When the temperature rises fairly quickly excess water will condense from the air onto any cold surfaces that happen to be around, which can include machine tools etc., as they are large and warm up slowly. This will happen even in hot climates, unless the climate is very dry.

But if one uses low consumption heaters on, near or under the covers of each machine then the machines will not have cold surfaces and the excess water will condense out onto something else, and the machines should not rust. The water has to condense out somewhere but better on the floor or walls than on the tools?

Better to have insulation so that the internal temperature cannot rise quickly, and best to have some background heating for comfort. Ventilation systems can also work by getting the warming moist air out of the shop as the temperature rises but these may require quite complex control systems or a lot of switching on and off by an attentive person to work effectively.

Thread: Where's this rust come from ?
01/10/2020 21:17:47

I don't want to labour a point but PVA does produce acetic acid, see " cameo.mfa.org/wiki/Polyvinyl_ acetate" and to quote from "Collection Risks" - "May release acetic acid on curing, ageing and deterioration."

I am not much of a chemist, and I had to look this up, but I understand that PVA was originally made by a German chemist, Fritz Katte, in 1912 by reacting acetic acid with ethylene in the presence of mercury. I don't know the precise reaction for the release of the acid but I imagine the PVA is partially decomposing as it cures. The aging and deterioration will be very slow so I don't think any acid release will be troubling after the initial cure.

Rod

01/10/2020 19:12:04

I accept that PVA glue as supplied may be chemically neutral and safe for children but that is not the end of the story!

PVA is a water based glue. The manufacturer adds water to the mix to make the glue fluid enough to be used.

When the glue is used 2 separate things happen. The water in the glue evaporates - and rusts anything nearby!

And the glue "sets", a chemical reaction which releases acetic acid, hence the smell of vinegar. Acetic acid is what a chemist would call a "weak" acid, as distinct from "strong" acids like nitric or hydrochloric, and it is not dangerous - but it will also rust anything nearby! (weak and strong in this context has nothing to do with concentration)

So if you use PVA, and it is cheap and effective, it is best to allow it to dry thoroughly and ventilate the job well before trusting it not to affect your tools.

Rod

01/10/2020 11:04:48

I agree with most of the above as possible reasons for the rust. The chest was most likely made abroad and shipped by sea and stored in unheated warehouse space and so has had every chance to get damp. The OPs workshop may be heated and drier so that the moisture is coming out of the wood and being trapped in the drawer spaces. Also, PVA may have been used to stick the "baise" down and this glue creates acetic acid as it dries (and may decompose releasing Formic acid? ) Perhaps best to locate a newly owned chest ( even an old one)  empty in the space it will occupy and with the drawers out, for a time, and to use VLC paper liners at least for an initial period. All these problems should disappear over time?

Rod

Edited By Rod Renshaw on 01/10/2020 11:25:20

Edited By Rod Renshaw on 01/10/2020 11:26:43

Edited By Rod Renshaw on 01/10/2020 11:28:49

Thread: 3/16 Cast Iron Rod
29/09/2020 17:40:01

I wonder if the sash windows in dolls' houses have cast iron sash weights?

Thread: Restoring a wooden tool box, help needed
27/09/2020 20:53:10

Thanks Ian. I will try the meths and fire, it sounds like something a wizard might do!

Thanks John. If the meths does not work I will get some oxalic acid and try that.

Rod

Thread: 5BA Threads
27/09/2020 10:26:53

+1 for EKP screws.

They make many of the screws themselves on Swiss automatic machines, all controlled by cogs and eccentrics etc., and which must be almost antiques by now.

Rod

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