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1st May 2018, 07:28 PM
Thread: April/May 2018 - PRIZE DRAW # 123
by chrisp- Replies
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- 747,190
CLAIMED I’m in.
I’m in.
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31st July 2011, 04:24 PM
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- 18
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- 6,804
[/LIST] Report it to the local state/territory...
[/LIST]
Report it to the local state/territory electrical authority - it shouldn't be on the market. It should require a "tool" or considerable force to expose the electrical terminals. -
16th March 2011, 07:49 PM
Thread: Prison worries
by chrisp- Replies
- 12
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- 1,607
You'd think he'd suggest fitting a safety switch....
You'd think he'd suggest fitting a safety switch.
:) -
14th March 2011, 03:15 PM
Thread: arcing angle grinder
by chrisp- Replies
- 6
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- 4,814
It is hard to tell from a exploded diagram. ...
It is hard to tell from a exploded diagram.
I'd be inclined to check/clean the commutator and see if it makes a difference. -
14th March 2011, 03:04 PM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
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- 13,284
I understand that it is "Class III" earthed. It...
I understand that it is "Class III" earthed. It is a new standard - and it has a new symbol (but the symbol is not in common usage yet).
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14th March 2011, 01:14 PM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
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- 13,284
I hope someone tells one of the world's biggest...
I hope someone tells one of the world's biggest computer manufacturers about this too. It seems that some laptop power supplies also earth one of the output pins.
Maybe they're wrong - but I... -
14th March 2011, 01:03 PM
Thread: arcing angle grinder
by chrisp- Replies
- 6
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- 4,814
Check that the brushes can slide freely in the...
Check that the brushes can slide freely in the holders.
Check that the brushes are bedded correctly to the commutator (fine emery paper wrapped around the commutator is a way to re-bed the brushes.... -
14th March 2011, 10:23 AM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
Maybe you can do what some (all?) of those cheap...
Maybe you can do what some (all?) of those cheap power tools do and put a sticker on it saying something like "Infrequent use only".
:) -
11th March 2011, 12:23 PM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
Reluctance is magnetic resistance. i.e....
Reluctance is magnetic resistance. i.e. resistance in the magnetic circuit rather than the electric circuit.
The relays have variable reluctance (i.e. it is different when open and closed) -... -
10th March 2011, 05:35 PM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
Pardon me, It's just me being pedantic again......
Pardon me, It's just me being pedantic again... :)
All this talk about 'in-rush'!!!
This is an DC coiled relay - DC coils are resistive (impedance)current limited. There is no in-rush as such!... -
8th March 2011, 10:54 PM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
Its called a free-wheel diode. The coil is...
Its called a free-wheel diode. The coil is inductive and therefore it is impossible to instantaneously interrupt the current flow. The free wheel diode provides a current path for the decaying...
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8th March 2011, 09:56 PM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
Two suggested changes to get the basics right. ...
Two suggested changes to get the basics right.
Remove D2 - it is just shorting out the bridge rectifier.
Place D2 to be directly across the coil of the relay - and make sure it is reverse... -
7th March 2011, 12:01 AM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
AC relays will have a laminated core to reduce...
AC relays will have a laminated core to reduce the eddy currents. DC relay cores can be solid.
The coils are wound differently too. The DC coils depend upon the resistance to limit the current... -
6th March 2011, 04:15 PM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
RC, If you are concerned, just try the AM...
RC,
If you are concerned, just try the AM radio trick. Wire it up and place an AM radio near it. If you can hear hash, then the item is emitting radiation.
And try running an electric drill... -
6th March 2011, 03:00 PM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
Now that is an over-the-top post! :) The load...
Now that is an over-the-top post! :)
The load is inductive - it will smooth the current and I'd doubt that you'd get harmonics in to the RF band.
Also, we are talking power diodes here -... -
6th March 2011, 10:17 AM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
Use two fuses - one in each active. The holder...
Use two fuses - one in each active.
The holder is a good type of fuse holder, but check that you can get a suitably rated fuse to suit your set up.
If you have trouble finding fuses (or fuse... -
5th March 2011, 11:28 PM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
- Views
- 13,284
Stewart, Thanks for the update. Just a...
Stewart,
Thanks for the update. Just a question regarding the short to clarify the situation - is it something to do with the transformer itself? -
5th March 2011, 10:52 PM
Thread: Building an electrical control box
by chrisp- Replies
- 140
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- 13,840
The usual convention is to build up the...
The usual convention is to build up the 'internals' on an aluminium panel instead of the ply you have used.
It is also usual to have a 'earth point' in the form of a stud (screw inserted from... -
5th March 2011, 12:01 PM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
- Views
- 13,284
All the above discussion is applicable - you are...
All the above discussion is applicable - you are just using a different voltage transformer. As you have a 415V single phase primary, you just connect it between two active phases rather than an...
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5th March 2011, 10:26 AM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
- Views
- 13,284
Stuart, I think we are pretty much in...
Stuart,
I think we are pretty much in agreement. I note that we might have a difference of opinion on the earth at the 110Vac outlet. And I agree, that by and large it'll make little difference.... -
5th March 2011, 01:24 AM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
- Views
- 13,284
Not if the transformer is connected to the supply...
Not if the transformer is connected to the supply by the means of a plug and socket. AS/NZS 3000 only applies to "installations", not appliances.
For what it is worth, elkangorito's diagram... -
2nd March 2011, 08:50 PM
Thread: Disgusting
by chrisp- Replies
- 8
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- 1,856
That's the attitude! As I posted earlier, it...
That's the attitude!
As I posted earlier, it is mostly a OH&S thing. I'd rather sell 'scrap' to someone who'll use all its parts it to make a working machine than have to sell it to a scrap yard... -
1st March 2011, 01:16 PM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
- Views
- 13,284
I just realised an oversight in my post... ...
I just realised an oversight in my post...
Definitely connect the earth (from the 240V) to the earth on the 110V outlet (if not already connected, or not already connected via the enclosure).
... -
1st March 2011, 11:17 AM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
- Views
- 13,284
For most part it is neither here nor there is you...
For most part it is neither here nor there is you earth one leg of the 110V side of the secondary of the transformer.
There are two considerations that may play part:
Depending upon the... -
28th February 2011, 02:14 PM
Thread: Powerfeed transformer wiring diagram
by chrisp- Replies
- 47
- Views
- 13,284
What you have proposed sounds correct. Make...
What you have proposed sounds correct.
Make sure that you use the appropriate lugs (ring eyelet type by the look), and don't just twist the wire around the posts.
Also, and most importantly,... -
23rd February 2011, 09:52 PM
Thread: What TableSaw do you have?
by chrisp- Replies
- 36
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- 10,852
Delta Unisaw (old model) Pros: Lots of...
Delta Unisaw (old model)
Pros:
Lots of accessories are available (but not always locally).
52" Genuine Biesemeyer fence.
USA made.
Two cast iron extension wings.
Run-out is less than... -
23rd February 2011, 07:45 PM
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John, I'm being pedantic here. I think you...
John,
I'm being pedantic here. I think you are confusing resistance with resistivity. Resistivity is a property of the material, whereas resistance is a property of the resistively of the... -
21st February 2011, 09:13 PM
Thread: Welding earthed objects
by chrisp- Replies
- 6
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- 2,891
It will be highly dependent upon local factors...
It will be highly dependent upon local factors too. From memory, the earth impedance can be up to 0.5 ohm to the outlet, and a further 0.5 ohm in the appliance (welder) itself. If the cable run is...
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21st February 2011, 09:31 AM
Thread: Disgusting
by chrisp- Replies
- 8
- Views
- 1,856
It is an OHS/liability thing. I've done similar...
It is an OHS/liability thing. I've done similar when disposing of equipment at work. Unless I have all the manuals and all the service records and I can absolutely confirm the equipment is in 100%...
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20th February 2011, 11:49 PM
Thread: Welding earthed objects
by chrisp- Replies
- 6
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- 2,891
Welding earthed objects
While I missed the latest spat on the possibility of using a 15A welder on a 10A circuit ( https://www.woodworkforums.com/f160/15amp-welders-10amp-circuits-126819/ and...
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26th October 2009, 11:00 AM
Thread: re- replaced brushes now sparking
by chrisp- Replies
- 5
- Views
- 2,006
I would suggest that you dress the brushes to fit...
I would suggest that you dress the brushes to fit the commutator.
The usual approach is to take a thin strip of emery paper that is a little wider than the brushes and sit it between the brush... -
13th July 2009, 02:27 AM
Thread: amplifier building and safety standards
by chrisp- Replies
- 13
- Views
- 4,418
You might be interested to pick up a recent past...
You might be interested to pick up a recent past issue of Silicon Chip magazine. There has been some discussion of an audio amplifier's linear power supply that has been causing interference. You...
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17th June 2009, 10:43 PM
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- 15
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Biesemeyer make a retro-fit quick remove...
Biesemeyer make a retro-fit quick remove splitter. I have one on my saw and find it much better, and sturdier than the standard arrangement.
See... -
13th June 2009, 10:08 PM
Thread: Electrical & CFM
by chrisp- Replies
- 11
- Views
- 2,197
elkangorito, All good points you have made,...
elkangorito,
All good points you have made, however, I suspect that the OP used "duct" in the context of air or dust extraction ducts. :) -
10th June 2009, 03:36 PM
Thread: Electrical & CFM
by chrisp- Replies
- 11
- Views
- 2,197
Chris, Assuming you haven't installed a mains...
Chris,
Assuming you haven't installed a mains switchboard yet, another option for remote switching the cyclone is to have the supply to all the other machines that use the cyclone go through a... -
9th June 2009, 11:37 AM
Thread: Need wiring diagram for two switches.
by chrisp- Replies
- 16
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- 36,541
John with respect if you know of a jurisdiction...
John with respect if you know of a jurisdiction in which my claim is not true in, then please state which jurisdiction.
The method I posted earlier in this thread is the recommended method. ... -
6th June 2009, 09:04 PM
Thread: requirements for a 15a circuit
by chrisp- Replies
- 63
- Views
- 8,988
I'm always amazed at the level of emotional...
I'm always amazed at the level of emotional augment that endures with electrical topics. :?
Geoff, I don't know of any orthopedic surgeon who would attempt knee surgery on themselves! And, why... -
3rd June 2009, 10:15 PM
Thread: requirements for a 15a circuit
by chrisp- Replies
- 63
- Views
- 8,988
Try the other forum... ...
Try the other forum...
http://www.renovateforum.com/showthread.php?t=74726
We have fun over there! :)
.. and you will find the answers. -
3rd June 2009, 06:09 PM
Thread: requirements for a 15a circuit
by chrisp- Replies
- 63
- Views
- 8,988
He's a bit touchy on this topic :argue: :)
He's a bit touchy on this topic :argue:
:) -
28th May 2009, 07:10 PM
Thread: 10A / 15A confusion
by chrisp- Replies
- 16
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- 3,465
Let's see. 10A circuit: up to 15 outlets (or...
Let's see.
10A circuit: up to 15 outlets (or more now), 2.5mm2 cable, 16A or 20A breaker
15A circuit: 1 outlet, 2.5mm2 cable, 16A or 20A breaker
The only real difference is the number of... -
28th May 2009, 06:27 PM
Thread: 10A / 15A confusion
by chrisp- Replies
- 16
- Views
- 3,465
I can't see any technical reason why this would...
I can't see any technical reason why this would void the warranty. Maybe if you changed the 15A plug on the equipment to a 10A plug, they supplier may claim it was modified?
It seems to me that... -
28th May 2009, 05:51 PM
Thread: amplifier building and safety standards
by chrisp- Replies
- 13
- Views
- 4,418
Have a search for EMC standards, EMC testing ...
Have a search for EMC standards, EMC testing
(ElectroMagnetic Compabability)
In a nutshell, to sell equipment commercially, you will need to prove compliance with the relevant EMC standards... -
27th May 2009, 06:53 PM
Thread: 10A / 15A confusion
by chrisp- Replies
- 16
- Views
- 3,465
Correct for DC. For AC under what we call...
Correct for DC. For AC under what we call steady-state-sinusoidal (SSS) excitation (i.e. after all the transitions have decayed), the AC current is:
I = P/(VxPF)
where PF is the power factor. ... -
27th May 2009, 06:22 PM
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It has been awhile... Continuing the story,...
It has been awhile...
Continuing the story, when I last left it, it was essentially a wiring mock up to check that the motor and variable speed drive would work together. Now that I'm happy it is... -
22nd May 2009, 10:12 PM
Thread: Triton Update - May 2009
by chrisp- Replies
- 16
- Views
- 3,771
Aussie, Sorry, I missed the message directed...
Aussie,
Sorry, I missed the message directed to me. Claw Hama worked it out. You could say Claw Hama hit it on the head, so to speak!
"Charge to 360 J", "Clear", ...
Strange as it may... -
22nd May 2009, 06:30 PM
Thread: Restaurant Trick
by chrisp- Replies
- 9
- Views
- 1,520
I was wondering too. According to WordWeb: ...
I was wondering too.
According to WordWeb:
Coarsely ground hulled corn boiled as a breakfast dish in the southern United States -
21st May 2009, 05:19 PM
Thread: Triton Update - May 2009
by chrisp- Replies
- 16
- Views
- 3,771
"Charge to 360 J", "Clear", ... :)
"Charge to 360 J", "Clear", ...
:) -
8th April 2009, 10:31 AM
Thread: Need wiring diagram for two switches.
by chrisp- Replies
- 16
- Views
- 36,541
Whether wiring the dust collector as proposed is...
Whether wiring the dust collector as proposed is legal or not will depend upon which side of the power point the wiring is done. If the 2-way switching is done after the power point (i.e. the 2-way...
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6th April 2009, 07:06 PM
Thread: Need wiring diagram for two switches.
by chrisp- Replies
- 16
- Views
- 36,541
Like this... 101677
Like this...
101677 -
24th March 2009, 06:15 PM
Thread: Speed Control for brush motors
by chrisp- Replies
- 55
- Views
- 13,832
Batpig, Top job with the construction :2tsup:...
Batpig,
Top job with the construction :2tsup:
You might like to check the "taper" of the pot. They may have given you a "log" or "antilog" rather than a "linear" pot.