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  #151  
Old Wed 17 February 2010, 14:41
jestah
Just call me: jestah
 
auckland
New Zealand
Looking for cable and wondered what core size I should get for my limits and homing switches and if its ok to run a bundle inside a single shield or if each pair needs a shield. It seems like you guys are using a single 5+ core for this task but wanted to double check.
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  #152  
Old Mon 15 March 2010, 23:24
swatkins
Just call me: Steve
 
Houston
United States of America
Quote:
Originally Posted by sailfl View Post
Steve,

I have some bad news. They have less than 50' of the 18 ga 4 shielded wire. I even looked for 18 ga 5, 6 or 7 shielded wire without any success. I will check with them when I stop in.

They do have 14/3 shield wire for power cord to spindle around .38 a ft.

They also have 20 ga 7 shielded wire.
Nills are you going to go to that store anytime soon? I picked up almost everything I needed, here in Houston, with the exception of the 7 core 20 ga and the 2 core 20 ga... I figured I could use 4 core in place of the 2 core so I am only needing the 7 core cable...

Would you have a stock number for the wire you picked up?

Last edited by swatkins; Mon 15 March 2010 at 23:35..
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  #153  
Old Fri 19 March 2010, 20:34
timberlinemd
Just call me: Steve #66
 
Arizona
United States of America
Cable

Can someone give there opinion on this wire...
http://www.oselectronics.com/ose_p46.htm
You need to scoll down on the page to see the shielded cable
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  #154  
Old Sat 20 March 2010, 02:42
KenC
Just call me: Ken
 
Klang
Malaysia
They are too thin, the "standard" here is 18AWG or 1mm2 wires when using 4.5A motor current.
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  #155  
Old Sat 20 March 2010, 10:06
timberlinemd
Just call me: Steve #66
 
Arizona
United States of America
I read in a previous post from Gerald that he was going to recommend down grading the wire size to 21g when using motors in the 2-3 amp range. My system will be using a 35VDC power supply with the Gecko 540 driver and the PK296A2A-SG7.2 Oriental Motor. Will that wire be to small then?
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  #156  
Old Sat 20 March 2010, 12:31
bradm
Just call me: Brad #10
 
Somerville(MA)
United States of America
Steve, it depends. If you google "awg wire current" you'll find some useful pages.
for 22AWG, one table gives 7A as a "chassis wiring" number. However, comparing that to the conservative standards we use for house wiring, you'll see that the "chassis wiring" numbers run about twice the NEC numbers (41 for 12AWG vs 20, ... ). So it appears that 3.5A from the G540 is within range for 22AWG, assuming that the wire is in good shape. However, the wire will be flexed over time, and you won't have a lot of excess safety margin.
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  #157  
Old Tue 06 April 2010, 23:02
swatkins
Just call me: Steve
 
Houston
United States of America
Would using a cable with more than 7 cores be a good Idea? I think that 7 cores are all used with the proxies and I would not have a core for the Z height setting or any other low voltage applications...

I found this wire with 12 cores.

Is it worth using more cores?
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  #158  
Old Tue 06 April 2010, 23:39
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Without looking at your spec sheet, consider that you have to watch for the allowed bending radius when the cable flexes in the chain.
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  #159  
Old Wed 07 April 2010, 17:59
swatkins
Just call me: Steve
 
Houston
United States of America
This wire is rated for a bend radius of 4 x diameter... That's pretty tight
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  #160  
Old Wed 07 April 2010, 21:18
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
If you read carefully, you are going to find that 4 x diameter applies to a static installation......flexed once in its life only.
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  #161  
Old Wed 07 April 2010, 21:31
swatkins
Just call me: Steve
 
Houston
United States of America
Then I have a lot more to learn

This is the name of the wire...... 20/12cy NuFlex 1000 Shielded Flexible Control Cable

From the applications listed....Control Systems, Machine Tool , Industrial machinery,

Factory automation and drive systems.... I was thinking that it was a cable made for our purpose...
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  #162  
Old Thu 08 April 2010, 03:59
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Some thing to note :I was cutting yesterday while contracrors were servicing my shutter door, they did some welding and o boy was I pissed off. Somehow the interference from the welder throwed my project out by 10 mm on the x -axis so yes there is interference on the wires.It happened while they were welding.This morning I had to redo the project and it was perfect.
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  #163  
Old Thu 08 April 2010, 05:13
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Steve, if all the reputable cable producers are talking of a bend radius nearer 10 to 20 times diameter, why would an unknown brand be able to offer 4 times?
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  #164  
Old Fri 09 April 2010, 21:08
swatkins
Just call me: Steve
 
Houston
United States of America
Quote:
Originally Posted by Gerald D View Post
Steve, if all the reputable cable producers are talking of a bend radius nearer 10 to 20 times diameter, why would an unknown brand be able to offer 4 times?
That's the problem with today's world... Just don't know who to trust... If you read the sellers product information it seems, to the novice like myself, like this stuff is the greatest cable in the world. They cite many different manufacturing specifications and claim to meet them all...

I just did a search for the manufacture and more information... There was none to be found ... So I guess they can claim anything they want if they never have to back it up or can't even be found...

Thanks for the info Gerald
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  #165  
Old Fri 09 April 2010, 22:37
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Quote:
Originally Posted by hennie View Post
Some thing to note :I was cutting yesterday while contracrors were servicing my shutter door, they did some welding and o boy was I pissed off. Somehow the interference from the welder throwed my project out by 10 mm on the x -axis so yes there is interference on the wires.It happened while they were welding.This morning I had to redo the project and it was perfect.
The guys wanting to build plasma cutters should note this.

Hennie, I don't know how much screening/shielding you used, but I won't be surprised to hear that all your cables were shielded. Welding interference is severe and it could have gotten into your system via the mains AC power supply.
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  #166  
Old Fri 09 April 2010, 23:02
Regnar
Just call me: Russell #69
 
Mobile, Alabama
United States of America
If it is to good to be true it probably is. One of the guys on another forum thought he was buy all copper monster wire for his speakers. He ended buy steel coated in a copper film. Really low blow.

http://bbs.homeshopmachinist.net/showthread.php?t=40772
Attached Images
File Type: jpg scamcopper2.jpg (25.1 KB, 882 views)
File Type: jpg scamcopper3.jpg (39.0 KB, 878 views)
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  #167  
Old Fri 09 April 2010, 23:20
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Gerald ,All the wires are shielded what I also pick up is that there is a lot of spikes in the electricity feed to the workshop that also has an effect on the computer and I do pick it up on the cut.I have a pumphouse close to me and 3 of the towns water pumps are there so everytime it starts up there is a spike.
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  #168  
Old Sat 10 April 2010, 08:42
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Russell, I think it is hilarious that a bloke went to the cheapest store, and bought unmarked, unbranded cable and now makes a big noise that he was scammed.
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  #169  
Old Sat 10 April 2010, 16:05
cncb
Just call me: Brian
 
Connecticut
United States of America
I think the phrase "You get what you pay for" could be applied to just about any situation.

Last edited by cncb; Sat 10 April 2010 at 16:08..
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  #170  
Old Sat 10 April 2010, 17:10
Regnar
Just call me: Russell #69
 
Mobile, Alabama
United States of America
Gerald you should see some of the other topics. But it does show the you get what you pay for.
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  #171  
Old Sat 10 April 2010, 19:54
KenC
Just call me: Ken
 
Klang
Malaysia
It is human nature to maximise their $ value & assume too much..., There are real bargain deals out there, but that would come if one dig hard enough & know your stuff deep enough... & have some risk management in place... i.e. be reasy to get scam!
There are no free lunch...
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  #172  
Old Sun 11 April 2010, 00:13
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
And yet there is also big money to be made in creating high markups in perceived value . . . . . some people will pay over the top prices simply because of brand name or origin. Funny how it tends to be the same people who chase top names, and then go to the other end of the scale and whine at the dollar store.
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  #173  
Old Sun 11 April 2010, 00:32
KenC
Just call me: Ken
 
Klang
Malaysia
Exactly!
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  #174  
Old Sun 11 April 2010, 00:53
Kobus_Joubert
Just call me: Kobus #6
 
Riversdale Western Cape
South Africa
Send a message via Yahoo to Kobus_Joubert Send a message via Skype™ to Kobus_Joubert
I am happy with my GWM

Kobus el-cheapo
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  #175  
Old Sun 11 April 2010, 22:22
ekdenton
Just call me: Ed #8
 
Alamogordo, NM
United States of America
To me, because the wiring seemed to be the most tedious part of my build, i wanted to make sure that the wire that i purchased was from a reputable company and that even if it cost more, the chance of product failure would be lower. Or at least i hope that it will be. I started out looking for good deals in the US on the wire, and i did actually find some but it was either heavier gauge than what was specified, or had more cores than needed ect. Then I could not find one place that had more than a couple of the wires sizes which meant that i would have had to pay multiple shipping costs, in order to get everything i needed. And i did not see any specs on the cheaper wire that i can remember so it seemed in my opinion to be kind of a roll of the dice as to what quality of product i could get by price shopping or if the wire would even meet the specs that Gerald listed. So i bit the bullet and just ordered it all from the company in Germany and paid one shipping fee and it all arrived as ordered, good quality, and I hope that the extra cost will pay off. I guess only time and use of the MM will tell.

Last edited by ekdenton; Sun 11 April 2010 at 22:25..
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  #176  
Old Wed 16 June 2010, 07:02
PEU
Just call me: Pablo
 
Buenos Aires
Argentina
Found a source for screened flexible cables in Argentina, now I'm trying to decide which one is the right one:
http://www.marlew.com.ar/english/pro...rcom/index.php

I called the company and they suggested the EC-ARCOMP line based on my brief description of needs, but I'll do my homework comparing their offer with LAPP and other sources listed in this thread.
Datasheet: http://www.marlew.com.ar/files/pdfs_...ples_n23en.pdf

[EDIT] prices in pesos (divide by 4 for US dollars) http://www.electrotucuman.com.ar/car...PUTAC&pagina=1

The one I need EC0408 (18 AWG x 4 + shield) is not listed but one can infer its price from the models above and below, should be around 6 pesos/meter (USD1.5)

Last edited by PEU; Wed 16 June 2010 at 07:17..
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  #177  
Old Tue 22 June 2010, 11:57
cerelak
Just call me: cerelak
 
Lisboa
Portugal
help please

dear friends.

i have a question i hope im not being stupid asking.


are all the cables sheelded???or just the cables for the 4 motors?.
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  #178  
Old Tue 22 June 2010, 12:44
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Cerelak,
You need shielding on your power cables to keep the noise IN and shielding on your signal wires (estop, proxy etc) to keep the noise OUT.
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  #179  
Old Mon 19 July 2010, 14:11
IN-WondeR
Just call me: Kim
 
Randers
Denmark
Will Cat7 network cable be usable for the motors, when they are 4 wire motors. There are 4 pairs of wires, so the wires will be used one pair pr. wire on the motor. Do you guys think that it will be usable to power the motors?
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  #180  
Old Tue 20 July 2010, 18:23
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
Cat-7 cable is 23 gauge. That size wire is rated to carry 0.73A (power transmission rating). Two conductors would be able to handle up to about 1.5A if each conductor carried half the load (unlikely).

Sixteen gauge conductors are rated to handle 3.7A. Thirteen gauge wire can handle 7.4A

I have never tried using Cat-x cable for motor wiring, but I could almost bet that it would be too light-weight to do the job reliably.

On my test bench, I usually use 22-gauge cable, but the lengths are never longer than six feet. For test purposes, it works. On a machine, I would use at least 18-gauge and probably 16-gauge if possible.
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