Today I acquired...........

[Pete.]

Today I acquired an abrasive wheels refresher.

Not a very interesting day, but Jimmy Krankie was picking up the tab, we got fed, and it was raining out

Abrasive wheels chappie said you don’t need 110 in a fixed installation in a workshop. It’s only for temporary power. So in a workshop you can use 240?

Never heard that one before…….

Yes 110V is actually +55v and -55v so the biggest potential to earth is 55v so it's deemed safe enough to use as temporary power with no earth leakage protection. Your workshop tools can be 240v because they are fed from fixed installations so they will (should) be on protected circuits.

 

[James1979]

If there's something possible - not necessarily worth it - to write down, it surely will be written down here!




so I just showed my incompetence then, I thought it's some kind of "abrasive wheels refresher" diamond-tool





Thanks anyway


Carsten

--

Ahhh ok. No I already have one of them. With the wheels on, not a diamond one.

Edit. Like this.

 

[25.4_mechanic]

Ahhh ok. No I already have one of them. With the wheels on, not a diamond one.

Thanks.

And what would the name of one of these be? I have one grinding-wheel I barely can use anymore ....

 

[James1979]

Grinding wheel dressing tool

I think this - https://www.hoffmann-group.com/DE/d...sschleifen/Schleifscheiben-Abrichter/p/599100

 

[25.4_mechanic]

Grinding wheel dressing tool

I think this - https://www.hoffmann-group.com/DE/d...sschleifen/Schleifscheiben-Abrichter/p/599100

Ahh, germ. Abrichter = engl. dressing tool - I didn't know that word in either language

Thanks, James!

Carsten

 

[m_c]

It’s a course you’re supposed to do over here to show you’re competent to use grinders and grinding machines. Every few years you need to redo it.

There will be an equivalent in Germany! It may be the land of chocolate but it’s also the land of paperwork

Officially it's a course on how to change the wheels, not on how to use them.

 

[awemawson]

Ahh, germ. Abrichter = engl. dressing tool - I didn't know that word in either language

Thanks, James!

Carsten

Wheel dresser

 

[Seadog]

Star-wheel dresser

 

[James1979]

Officially it's a course on how to change the wheels, not on how to use them.

Mostly.

Star-wheel dresser

Not heard that one. I know it as a hodgson type.

Incedentally there’s a job lot of the pointy diamond ones on the bay for under £30 If anyones interested.

 

[dobbslc]

Today I acquired an abrasive wheels refresher.

Not a very interesting day, but Jimmy Krankie was picking up the tab, we got fed, and it was raining out

Abrasive wheels chappie said you don’t need 110 in a fixed installation in a workshop. It’s only for temporary power. So in a workshop you can use 240?

Never heard that one before…….

He right unless it's different for you guys upstairs
You HAVE to use 110 volt on a construction site but anything goes in a workshop.
As @pete says you are only allowed up to 55 volts to earth as stated in the regs but a 3 phase site transformer pumps out 65 volts to earth...
Mmmm I'm gonna have a look in the regs now.
Some principal contractors are making up their own regs now as well, one is asking for RCD protection on all 110 volt supplies! It causes nuisance tripping that they don't like but the man upstairs behind the desk pushing the big pen doesn't care.

 

[m_c]

Mostly.

View attachment 367916

Under the Abrasives Wheel Act 1974*, the only legal requirement is that you're qualified to change grinding wheels/discs.
There is no mandatory requirement to be able to use a grinder (but is probably covered by newer more generic legislation/guidance around competency and suitable training)

The fact the course covers usage, is incidental to the main purpose of the training, which is to ensure legal compliance.


*Is it still a legal requirement to have the legislation on display in the workplace?

 

[MetalMonkey]

IIRC, 240v is actually legally allowed on construction sites.
However, it is usually strongly advised 110v is used due to the nature of the risks, and many sites will stipulate 110v or cordless must be used as a matter of course.

Inside a workshop you can use what you like.

 

[James1979]

Under the Abrasives Wheel Act 1974*, the only legal requirement is that you're qualified to change grinding wheels/discs.
There is no mandatory requirement to be able to use a grinder (but is probably covered by newer more generic legislation/guidance around competency and suitable training)

The fact the course covers usage, is incidental to the main purpose of the training, which is to ensure legal compliance.


*Is it still a legal requirement to have the legislation on display in the workplace?

It’s 1970 Health and Safety at Work Act is 74

I’ve no idea about the poster. I’ll have to look it up. It wasn’t mentioned that I recall. I’ve the chaps number so I could always double check. It’d be handy to know.

You are probably correct in that you are required to demonstrate competence in using the equipment to use it in a workplace so rolling it all into one is a sensible way of doing the training.

I may have the wrong end of the stick but you don’t seem to approve of a lot of training really. When I posted about the IMI course I did last year you seemed pretty negative about the whole thing. May just be how it comes across though.

IIRC, 240v is actually legally allowed on construction sites.
However, it is usually strongly advised 110v is used due to the nature of the risks, and many sites will stipulate 110v or cordless must be used as a matter of course.

Inside a workshop you can use what you like.

Maximum of 110v I seem to remember but it wasn’t phrased like that. It was more convoluted but the upshot was 110 I think.

 

[Farside]

Don't skimp on the coaxial cable - no RG58 or - even worse - TV or satellite cable

RG 213 or URM 67 are the cables of choice. TV and satellite cables will be the wrong impedance anyway.

Sat 100 copper core and double-shielded cable is perfectly fine for reception and even Tx up to 400W if you work it out a bit.
Major advantage to that is it's dirt cheap, since it's made by the millions of feet every week, so you can afford to run it a fair distance by not paying the Ham Tax on 50ohm stuff.
Sat100 cable is as low loss as RG213 for less than half the price.
Avoid the steel-cored, copperplated, alloy shielded rubbish, as that's the most common sat cable.

 

[25.4_mechanic]

Sat 100 copper core and double-shielded cable is perfectly fine for reception and even Tx up to 400W if you work it out a bit.
Major advantage to that is it's dirt cheap, since it's made by the millions of feet every week, so you can afford to run it a fair distance by not paying the Ham Tax on 50ohm stuff.
Sat100 cable is as low loss as RG213 for less than half the price.
Avoid the steel-cored, copperplated, alloy shielded rubbish, as that's the most common sat cable.

That's solved cheap then. Great!

I too believe that the 75Ω wouldn't crash the party on Rx.

You're right, burn as little money as possible at first, when the interest grows and the solution is felt as sub-par, one can always upgrade ...

(I'm coming from a different background on this, hobby- and business-wise.)


Carsten

--

 

[m_c]

It’s 1970 Health and Safety at Work Act is 74

I’ve no idea about the poster. I’ll have to look it up. It wasn’t mentioned that I recall. I’ve the chaps number so I could always double check. It’d be handy to know.

You are probably correct in that you are required to demonstrate competence in using the equipment to use it in a workplace so rolling it all into one is a sensible way of doing the training.

I may have the wrong end of the stick but you don’t seem to approve of a lot of training really. When I posted about the IMI course I did last year you seemed pretty negative about the whole thing. May just be how it comes across though.

Near enough. We've still got both posters at work.
The Abrasives wheel training is justified, as they are dangerous things if treated wrong.

IMI I have very little time for.
All they're interested in is box ticking and extracting money, as any course I've done with them (and the apprentice 'training' I was asked to look at) through their approved providers, the content has been very poor, and assessments mediocre.
If you want motor vehicle industry training, you really have to do manufacturer training, as although they're mostly still doing courses to IMI standard, they actually teach you about the systems, not just how to pass a multiple choice exam.

 

[dobbslc]

IIRC, 240v is actually legally allowed on construction sites.

This I think is correct, but don't go blabbing it about or we'll have every Tom Dick and Boris bringing their 240 v extension leads in and plugging into the canteen sockets...

 

[James1979]

This I think is correct, but don't go blabbing it about or we'll have every Tom Dick and Boris bringing their 240 v extension leads in and plugging into the canteen sockets...

Depends what’s temporary I suppose. I’ve worked on site where the portacabin offices / workshops have been in situ for years and are as good as part of the furniture.

I read sites as out and about actually building stuff which would be temporary?

I’m not a sparky or a electric rule person but thinking back I’ve seen both on ‘sites’ but in different areas.

 

[dobbslc]

Some of the jobs I work on have canteens that will sit 200 + people.
A porta cabin in a yard is almost certainly part of a perminant installation in my mind.
A stack of porta cabins 20 long and 3 high on a job is probably temporary. There are grey areas.

 

[Onoff]

Well bugger me. I never knew that! That means I can use some 240 kit I have. Which is a result.

Near enough. We've still got both posters at work.
The Abrasives wheel training is justified, as they are dangerous things if treated wrong.

I recall being told I didn't need to attend a hands on, practical abrasive wheels refresher course and that they weren't booking it.

Apparently is could all be done online, on Human Focus!

There are some right ***** in management positions.