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Member postings for Robert Atkinson 2

Here is a list of all the postings Robert Atkinson 2 has made in our forums. Click on a thread name to jump to the thread.

Thread: Bayonetes
05/05/2020 17:52:53

I would certainly look at getting them to dealer or collector. Too much historical stuff is being scrapped as it is.
Value depends on model (I assume it's a 1907), make, age and condition but likely to be in tens of pounds, not scrap value. You can buy scabbards on ebay but they won't let you sell the bayonet.

Robert G8RPI.

Thread: Fake Mitutoyo indicator on Ebay
27/04/2020 18:29:47

The lathe listing is agiasnt ebay rules because it avoids their fees with contact info in the listing and is not a tangible item. The say "membership" starts at £1 a day but are charging £95 for a month. it's not at all clear exactly what you get for that. I'm sure the won't let anybody use a lathe 24/7 for a month for £95.

This sort of fee avoidance is common with car brakers, the list the car and then say £1 for a wheel nut or similar and gives a phone number to call if you want anything else.

Robert G8RPI.

Thread: Holding glass lens for grinding
27/04/2020 08:42:57

Hot melt glue makes a good alternative to pitch.

Robert G8RPI.

Thread: Cutting down a linear glass DRO encoder
27/04/2020 08:39:20

An abrasive / diamond disk should cut the glass scale without issues. Make sure that if it has an index mark that you don't cut that end off.

Robert G8RPI.

Thread: Painting cast iron - What have I done wrong?
26/04/2020 14:49:59

Anyone who thinks leaving the EU will relax environmental legislation is deluding themselves. Firstyl most are based on international agreements, not just the EU. Second companies will still have to comply with EU rules if they want to trade with the EU and they are not going to make two versions of the same product.

Robert G8RPI.

Thread: Any Idea What Lathe This Is?
26/04/2020 09:39:20

It looks like a Myford ML4 to me. Do you hav the tailstock or any other bits for it?

If not excessively worn it's a capable little lathe.

Robert G8RPI.

Edited By Robert Atkinson 2 on 26/04/2020 09:41:14

Thread: ML4
23/04/2020 19:50:08

Hi Ivan,

The "manual" is available online as a PDF,

http://vintagemachinery.org/pubs/detail.aspx?id=6592

An earlier copy of "The Amateurs Lathe" by L Sparey is also a good reference for this class of lathe.

I have a ML2 but it has been over a year since I've done anything to it due to other pressures.

Robert G8RPI.

Thread: Fake Mitutoyo indicator on Ebay
23/04/2020 18:37:02

You should report it to ebay and ask for a refund for item not as described. This type of seller does not care about feedback. They do care about not getting their money. Selling it as a "Mitetoyo" is OK, buyer beware, but putting Mitutoyo in the titile and description is fraud. If people don't complain ebay won't do anything.

Robert G8RPI.

Thread: Central heating woes.
21/04/2020 16:45:39

Yep,

Hydrogen to be exact. Water (H2O) + Iron (Fe) = Rust (Fe2O3) leaving Hydrogen (H2).

Robert G8RPI.

Thread: An Odd Screw
20/04/2020 22:01:01

Not just loudspeakers, but that as a common appliction. Used in all sorts of wooden cabinets with mechanical fixings. The one pictured is a bit long for loudspeakers.
There are similar looking wood screws with a different "thread" on the shank that is supposed to reduce the driving torque when installing but keeping the screw tight when installed..

See also pronged tee nuts, not the type used in machine tables.

Robert G8RPI.

Thread: "I'm gobsmacked", Mi' Duracell's leaked.
15/04/2020 21:44:20

This is a RoHS problem.

Several years ago the addition of mercury to batteries was banned. The old Duracell and Energizer alkalines had a small amount of mercury which aided recombination of hydrogen which is produced in the cell. Thse cells had a leakproof warranty. When the mercury was removed so was the warranty. The mercury free cells tended to leak even when not left flat. In the last few of years they seem to have solved the problem. Certainly in the USA Energizer have brought the warrty back. I have 20 year old cells that are fine but 5 or six year ones that have leaked. Recent ones seem to be OK for both brands.

Robert G8RPI.

Thread: Serious Readers, serious prices
14/04/2020 21:06:58

Google GU5.3/MR16 5W LED pick a beam angle and "colour"

e.g. https://www.ledbulbs.co.uk/products/philips-5w-led-gu53-mr16-very-warm-white-71063 (I don't know this supplier, do your due dligence)

At a few quid it's worth a punt. pretty sure it will fit and OK electrically.

Robert G8RPI.

Edit MUST TYPE FASTER!

Edited By Robert Atkinson 2 on 14/04/2020 21:08:03

Thread: Colchester Student Mk1 Won't Start
11/04/2020 13:23:28

Normal cleaning of the motor is fine. Remove surface rust from the rotor but dont worry about making it pretty. For the laminations in the stator I'd just use a nylon brush to remove loose material. You must be careful not to damage the insulation on the windings.

Robert G8RPI.

Thread: Conundrum
10/04/2020 17:45:53

This won't work as an internal pulller unless the race is in a blind hole ot you can bolt a support across the back of it

Thread: Coronavirus
10/04/2020 09:46:05

It amazes me how many people can't shop on their own. Went to the village store (Tesco Extra, yes it's the only food shop in the village) to pick up the wife's medication and some essentials last night. In self chck out there was couple with a child in a stroller. Just one basket and most of that was alcohol! Utter stupidity.
I'm closely involved with this project: https://www.theengineer.co.uk/exovent-covid-19-ventilator/ Basically a modern iron lung.

Robert G8RPI

09/04/2020 12:49:17
Posted by RMA on 09/04/2020 11:33:52:

Unfortunately this country has avoided actual lock down. It would have made more sense to close everything other than hospitals and really essential services and we could have got over this a lot quicker, as S Korea did for example. Today airports are still open and the possibility of the virus coming in from Europe; USA and the rest of the world is highly probable. No arrivals are being checked, they are let loose into the community while we are all staying in obeying the rules!

Sheer madness in my opinion. An RAF A330 left Brize Norton yesterday and routed to Goa, presumably to repatriate people. This should not happen, unless these people have been tested accurately for now being immune (highly unlikely) they should all stay where they are.

Passport renewals are not an urgency!

The plan was never to have total loss of tranmission / lockdown. The idea is to slow the infection rate so the NHS can cope. Same number of cases but spread over longer period. You have to have some transmission for this to work. If you had totl lockdown you would have zero new infections and then when you let pople out the number of cases would be just as bad as if you had done nothing and he NHS would still be overwhelmed.

Robert G8RPI.

Edited By Robert Atkinson 2 on 09/04/2020 12:51:47

Thread: I once built a go cart
06/04/2020 11:25:41

Had one with Pram wheels
Have driven a proper one on a go-cart race track
Have drag raced a milk float.

Robert G8RPI.

Thread: Todays news -- well done
06/04/2020 10:39:25

While walking the dog and getting my exercise yesterday I noticed what appeared to be a young man in he childrens play area. wandering over (no closer than about 15ft) I discovered a man, toddler and obviously pregnant woman on the paly equipment. I pointed out the area as closed and the signs. The Man was totally dismissive, "I'll be alright" clearly no understanding of transmission or care about anyone else. They commented on my being out and I said walking, the dog, exercising, keeping my distance and not touching anything.

I think essential checks on club facilities, if alone and subsituted or combined with that days exercise, is reasonable. Needs to be only ONE member doing it though. If every member checked or there was a rota that is a classic cross contaminaion case.

Robert G8RPI.

Thread: How can I remove this mould from painted surface?
05/04/2020 16:03:08

An effective, safe fungicide is benzalkonium chloride. This is used for everything from eye drops to patio cleaner. Dettol dishwasher cleaner is a good low volume source. It works well on sensitive surfaces. Bleach (Sodium Hypochlorate solution) most certainly DOES kill fungal growth and inactivates spores. It also bleaches any colour deposits. The disadvantage is that it causes corrosion.
Killling and removing the fungus may not restore the surface finish. Chemicals secreted by the fungus can etch or corrode the surface causing damage that has to be repaired by re-finishing or polishing. Fungus won't grow on aluminium but it will grow on contamination on surface, even finger prints. Th secretions can still etch the aluminum giving the impression that the fungus "eat" it.

Robert G8RPI.

Thread: BBC Micro Boxford TCL125
05/04/2020 13:52:01

I would approch this as if you were looking at concverting a manual mill and had already mounted the stepper motors. Look at the mill and get motor part numbers and see were the limits switches are located. With that informtion look at the guides for a CNC conversion. As others have said, it's not worth reverse engineering the old electronics. New stepper drivers will work fine with older motors, at most you might have to adjust the suppply voltage or current settings.

Robert G8RPI

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