Thread: todays tools gloat

Originally Posted by Oldneweng

I would have thought that a thermistor would be on a seperate circuit so obviously you would not want to megger that circuit. Are you saying that there could be a thermistor in one of the actual motor windings, hence the damage? As a newbie I want to be aware of any risks to my pocket.

Dean

you are right Dean..a separate circuit but they generally bring the terminals out into the terminal box...if you dont carefully observe what you are doing you could think else wise as to what they are...and hence megger test

Originally Posted by simonl

I've seen plenty of motors with thermal switches that are series wired in with the windings but never noticed a motor with a separate "thermal circuit" with a thermister. I assume it would be pretty obvious since it would have an extra 2 wires, and they would be much thinner.

Simon

They would need to be able to handle 440v then. My one and only experience is a motor that is monitored via plc.

Dean

Originally Posted by Oldneweng

They would need to be able to handle 440v then. My one and only experience is a motor that is monitored via plc.

Dean

the type i am specifically refering to are the low voltage type..usually embeded IN the windings or they can be installed later but are surface mounted to windings...both do not take high voltage....and also have their own terminals..which could be mistaken for normal motor terminals to the unwary

Then there are the type which are in series with windings but generally not applied to 3ph motors....and this type can take high voltage but do not have their own terminals....these are not thermistors as such but rather a Bi-metal switch's.

Originally Posted by Oldneweng

They would need to be able to handle 440v then. My one and only experience is a motor that is monitored via plc.

Dean

Edit

The one's connected in series with the windings referred to here.

Dean

Well i just won 2 filing cabinets at our local auction house. A 3 and a 4 drawer.....filing cabinets you say? No no no, these are 900 wide units made to hold suspension files back to front. They had a drop down draw front and the drawer runs on it giving them a huge weight capacity. I already have 2 4 drawer units that cost me about $100 each. I got the 2 today for $22 and $34.

Ew

Oh, and i'm happy to put it here as it is at the expense of the Canberra public service.....

Not had a gloat in awhile.... And this is not tool related, but is metal

2" pipe, mostly OK condition... About half of it screwed with couplings... about 180 lengths.... I paid approx $430 a tonne, about 5.8 tonnes there..


Going to use it for sheds and other stuff..

20140613_154907.jpg

Originally Posted by .RC.

Going to use it for sheds and other stuff..

With that much pipe. Have you thought about drilling for oil?

Originally Posted by .RC.

Not had a gloat in awhile.... And this is not tool related, but is metal

2" pipe, mostly OK condition... About half of it screwed with couplings... about 180 lengths.... I paid approx $430 a tonne, about 5.8 tonnes there..


Going to use it for sheds and other stuff..

20140613_154907.jpg

That's a lot of pipe! If you bought a large quantity of end caps then I'd be a little concerned if i was your neighbour!

Simon

Got my hands on a couple of new to me tools today: A 12" Moore&Wright precision square and a set of 8 small gear cutters. They are 20deg pressure angle but I haven't figured out yet what module or pitch they are yet. Anyone know how I can tell?
Also got a small single shot oil pump that I will fit either to the lathe or the surface grinder.
IMAG1279.jpg

Does it not say on them the size? I cannot see what is written on them in the photo other then the cutter number and the pressure angle..

No doubt somewhere there is info on how to measure them... Remembering that a gear cutters only purpose in life is to create swarf... It does not cut gear teeth

Originally Posted by jhovel

Got my hands on a couple of new to me tools today: A 12" Moore&Wright precision square and a set of 8 small gear cutters. They are 20deg pressure angle but I haven't figured out yet what module or pitch they are yet. Anyone know how I can tell?
Also got a small single shot oil pump that I will fit either to the lathe or the surface grinder.
IMAG1279.jpg

Hi Joe,

It's normally written on the gear cutters. For example, the one third from the right has 20 deg No.6 35 - 54

I assume this means 20 deg PA, No. 6 module and will cut gears with 35 - 54 teeth.

Nice!

Simon

Originally Posted by jhovel

Got my hands on a set of 8 small gear cutters. They are 20deg pressure angle but I haven't figured out yet what module or pitch they are yet. Anyone know how I can tell?

That's a curly one Joe. Start by measuring the bore. (In Australia) DP cutters have a 1" bore; module cutters are various sizes (16, 22, 27 mm diameters for starters). You then might have to cut some gears based on some assumptions about what the module/ DP is and see which ones mesh.
This also may help.

table.jpg

Failing that, send them across for a holiday and I'll see what I can work out...

Michael

Only 2 out of 3 for that try Simon - the number 6 is just a reference on which cutter it is in the series. Sorry.

Originally Posted by Michael G

That's a curly one Joe. Start by measuring the bore. (In Australia) DP cutters have a 1" bore; module cutters are various sizes (16, 22, 27 mm diameters for starters). You then might have to cut some gears based on some assumptions about what the module/ DP is and see which ones mesh.
This also may help.

table.jpg

Failing that, send them across for a holiday and I'll see what I can work out...

Michael

Only 2 out of 3 for that try Simon - the number 6 is just a reference on which cutter it is in the series. Sorry.

Buggar! That's a silly thing to label on a gear cutter then.

Oh well, 2 out of 3 ain't bad, Just ask "The loaf"

Simon

Originally Posted by simonl

Buggar! That's a silly thing to label on a gear cutter then.

Oh well, 2 out of 3 ain't bad, Just ask "The loaf"

Yes, but would you prefer going up to a storeman and asking for a "16DP no. 3 cutter" or a "16DP 35 to 54 tooth cutter"?
I'm not picking holes in 2 out of 3. I reckon a good proportion of my exams I passed with less than that

Michael

Originally Posted by Michael G

Yes, but would you prefer going up to a storeman and asking for a "16DP no. 3 cutter" or a "16DP 35 to 54 tooth cutter"?
I'm not picking holes in 2 out of 3. I reckon a good proportion of my exams I passed with less than that

Michael

Ha! And I sounded so confident too!

I was a little suspicious as to the reliability of my "knowledge" when someone of Joe's calibre was asking!

Knew it was too good to be true. I'm just not going to live long enough to know something that you guys don't!

Simon