Member postings for Robert Atkinson 2

Great work!
Thanks for letting us know the final result. All too often the OP disappears without trace and you don't know if you helped or not.

Robert.

The other issue is the amount of stuff that is rubbish, wrong and often downright dangerous. I see a lot of links to electronic test equipment videos and the number of those that are just plain wrong is staggering. Even from presenters who are supposedly experts and some who make their living from it.

I note that the above discussion concentrates on the traditional method of holding the cutter in the headstock. There is of course the option of adding a milling head to the lathe. This is an example:
https://www.sealey.co.uk/product/5637200350/drill-head-for-mini-lathe-sm2503a
Problem is they are 2/3rds the cost of a mill so mostly useful where space is at a premium.
A DIY milling head is a possiblity particuarly if you are happy with small cutters and a high speed spindle of the type sold for CNC machines.

Robert.

The number of LED lamps fitted are highly unlikely to cause a 6A MCB to trip on inrush. It is also unlkiely to be intermiitent.
I don't think this is a problem that can be diagnosed remotely. The only thing I can think of based on the description is some kinf of intermittent fault in the 4 position switch or it's immediate wiring. I There is not much else that is common to both strings of lights. Damage by rodents or insect infestation is another possibility but unless the two strings share a common cable (3 core and earth is a possibility) or junction box it is still hard to see a common point of failure.

Robert.

Yes he has " Consumer unit is a main 60ARCD with 4 MCB's the lighting circuit NIDCB06 "

So RCD on input and 6A MCB feeding four switched light circuits. My understanding is that the fault WAS if EITHER of the two internal light circuits were switched on the 6A MCB tripped.

Robert.

A fault on one set of lights would not cause the breaker to trip when the other set was turned on.
A Erth -neutral fault wont trip a circuit breaker. It will trip a residual current device but the OP said it ripped the lighting CB with no mention of a RCD. A RCBO is a possibility on a modern installation but it's highly unlikely a RCBO was fitted to a lighting circuit 10 years ago.

Robert.

That is very strange. Turning on either set of lights causing an over-current trip implies a common fault or fault load before the switch just under the trip point. Neither of these has an obvious cause. It would require knowledge of the exact wiring arrangement right down to the connection methods used.
What type and rating of lights?
What rating circuit breaker?
What brand of switches etc?

The next step as an electrician would be some measurements, insulation resistance and load current and a detailed inspection..

Robert.

+1 for" Bisley" type drawers or Really Useful Boxes. I use both. Well worth the extra cost. I have RLB's that are about 20 years old and still perfect. The cheaper clones seem to fall apart aftaer a few years.

Robert.

Edited By Robert Atkinson 2 on 19/09/2023 09:39:14

As long as the centrifugal switch is working and the motor is not getting hot the bigger capacitor may not be a problem. It is mainly purpose is to provide a phase shift. The current depends on both the capacitor and the winding.
The motor manufacturer will fitt the smallest capacitor possoble to reduce costs. I'd be more concerned if it was a run capacitor.

Robert.

I ordered a indexable end mill and some inserts etc from ARC yesterday afternoon and they arrived this morning.

Always had great service from Ketan and his crew.

Robert.

According to this:
https://www.motorsportmagazine.com/archive/article/february-1956/37/hazards-of-winter/

Formula B was a protective coating for cromework and the like.

Edited By Robert Atkinson 2 on 15/09/2023 18:18:32

Wires can go either way around no difference in operation.

I agree with SOD on input cable.
Earth block is OK as long as it is fastened directly the metal plate / box the VFD is mounted on.

Robert.

I don't know the gland design , but from a EMC performance respect that is perfect. You just need to make sure it has adequate mechanocal support.

If you are talking about the control switch, yes 0.75mm2 is fine.

The capacitor in your tumble dryer is a safety critical component. It is, or should be, a X rated mains capacitor. The 250V rating for a X capacitor is the maximum nominal supply voltage it may be used on. The actual test and breakdown voltage is significantly higher to allow for the spikes and surges you see on the mains supply. For a X1 (highest specification) the peak voltage rating is 4000V for an X3 it's 1200V.

Sorry Colin, I can't give much more insight to the value of capacitor you need than has been suggested by others. Using the minimum required to start the motor is optimum. This also depends on the load. If the motor is starting with no load at all dur to a clutch or loose belt then a much smaller capacitor will work. If it has a fixed load with a lot of inertia it will need a larger capacitor.

Robert.

Depends on:

Frequency of supply

Value of L2

Value of C

Only thing we can say for certain is VC + VL =230V

Robert.

Why is an article on fitting a ELS in ME and not MEW?

Robert.

Never mind cyclists illegal E-scooters and E-bikes are a growing menace with low enforcement. Any E-bike that is not an official hire scheme is illegal in any public place in the UK. Same offence as driving a car without licence or insuurance.
The E-bikes are a bit less obvious in their illegality. I'm talking mostly about the moped style ones popular with food delivery riders. To be legal without licence, insurance, helmet etc they should only provide electric assistance when being pedalled and at speeds less than 15.5 MPH (was 15 MPH but changed to match 25 KPH). Note that this means no hand throttle. They are moto assisted pedal bikes not electric motor bikes. At least one popular brand used by delivery riders is actually desigined and approved as an electric motor bike. To allow use as an E-bike without licence etc they modify them in the UK. This includes removing the twist throttle. However they ship the bike with all the removed parts in the box and have guides on their website on how to refit them. If you see one without a numberplate and helmet running without peddling or at over 15.5 MPH it's illegal. Enforcement seems non-exsitent though.

The adjustible regulator linked to is a bit over-specified for current. It draws more current off load than your tacho does.
Have you tried running the tachometer off 5V? It may work OK.

Robert.