You are not registered yet. Please click here to register!


 
 
plc storereviewsdownloads
This board is for PLC Related Q&A ONLY. Please DON'T use it for advertising, etc.
 
Try our online PLC Simulator- FREE.  Click here now to try it.

---------->>>>>Get FREE PLC Programming Tips

New Here? Please read this important info!!!


Go Back   PLCS.net - Interactive Q & A > PLCS.net - Interactive Q & A > LIVE PLC Questions And Answers

PLC training tools sale

Reply
 
Thread Tools Display Modes
Old January 11th, 2019, 10:11 AM   #16
Bit_Bucket_07
Member
United States

Bit_Bucket_07 is offline
 
Bit_Bucket_07's Avatar
 
Join Date: Feb 2013
Location: Southeast US
Posts: 1,453
Quote:
Originally Posted by Archie View Post
Does no one use metric screws?


If you intend to follow NFPA 79, then here are a few highlights to consider:
11.2.1.5 Threaded fasteners with machine threads shall be used to attach components to a subplate

11.2.5.1 Steel subplate thickness shall provide engagement of at least 2 full threads

11.2.1.5.4 Sheet metal screw, rivets, welds, solders, or bonding materials shall not be used to mount component to subplate

Exception: Rivets shall be permitted to be used for attaching mounting rails and wiring channels provided the exposed surface is smooth and free from any portion of a protruding stud.

The self drilling screws which are often used by electricians are typically sheet metal screws, therefore would not be NFPA79 compliant.
Pop rivets are more than adequate for DIN rail and wire duct, but I certainly wouldn't use them for mounting other components.
__________________
  Reply With Quote
Old January 11th, 2019, 11:43 AM   #17
GaryS
Member
United States

GaryS is offline
 
GaryS's Avatar
 
Join Date: Aug 2003
Location: Lancaster Pa.
Posts: 868
Din rail and wire duct are not considered components in the context of a panel.
you only need to use a taped screw if you are using it a grounding(Bonding) means for the din rail. if you do that then it is not considered as part of the mounting but as a separate grounding device it must not be used to mount the rail and must be Radley identified as the grounding point ( Green colored screw) and the paint must be scraped off at the point of contact and aluminum din rail may never be used as a grounding buss. I have seen some panel shops use double sided tape to mount the wire duct, in fact at one time you could by the duct with the tape already mounted.
  Reply With Quote
Old January 11th, 2019, 12:26 PM   #18
Saffa
Member
New Zealand

Saffa is offline
 
Join Date: Feb 2012
Location: Bay of Plenty
Posts: 968
Quote:
Originally Posted by BryanG View Post

So you have one operation to drill the panel, stop and put down the drill, pick up the next one with the tap in it, dip the end in cutting oil, drive it in, then drive it out, then put that machine down, then clean away excess oil and the little bits of metal that come out of the tap, then pick up a device to fit and tighten the screw being careful not to cross thread, perhaps adding a shakeproof washer. How much time could you save if you missed out the tapping bit but still ended up with M4, M5 and M6 tapped holes. I really should buy shares in one of these Taptite companies.
Everything in the enclosure is marked first, drilled, tapped then cleaned out. But we only build very small panels ourselves generally to a standard template. I can see the time saving using self tapping screws, sure.

And don't worry, you haven't offended your long lost mates here in NZ... although when Brexit turns to custard please don't all move here... we do speak English, but sometimes I think half you lot don't anymore!
  Reply With Quote
Old January 11th, 2019, 02:53 PM   #19
Aabeck
Member
United States

Aabeck is offline
 
Aabeck's Avatar
 
Join Date: Feb 2013
Location: Detroit
Posts: 1,187
I always drill & tap, almost always using a drill to tap.

I used to work for a machine builder that always used 'Tek's' self drilling screws for EVERYTHING. The drill ends frequently dulled before the hole was through, or broke, and when trying to take the screws out it was a PITA. I never spec or use self drilling screws for my projects.
__________________
Never underestimate the quality of idiots that will be running your machines
http://aabeck.com
  Reply With Quote
Old January 11th, 2019, 04:11 PM   #20
James Mcquade
Member
United States

James Mcquade is offline
 
Join Date: Oct 2007
Location: Tennessee
Posts: 2,365
at the oem shop where i worked, we used 8-32 x 3/4" and bought a 50 lb box. they lasted for about 2-3 years, then we would but another box.

james
  Reply With Quote
Old January 11th, 2019, 05:20 PM   #21
mbartoli
Member
United States

mbartoli is offline
 
Join Date: Sep 2007
Location: Cape Canaveral, FL
Posts: 163
We had a UL508A panel shop. Drilled and tapped, used Tap Magic, for 10-32 x 1/2". The Greenlee combo sets work well IF you use a clutching battery drill with generous TM. If you use regular (good quality) taps, they last forever, but the Greenlee eliminates the need for separate operations. Did them both, depending how the spirit moved us.

I still have a set of the Greenlee's at home; be amazed at when they come in handy.
__________________
Mark

Those who say it cannot be done shouldn't interrupt the people doing it.
  Reply With Quote
Reply
Jump to Live PLC Question and Answer Forum

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Topics
Thread Thread Starter Forum Replies Last Post
DIN Rail mounting hole spacing AustralIan LIVE PLC Questions And Answers 20 January 7th, 2018 03:54 PM
Looking for a replacement for my preferred DIN 35 rail b sparkyinak LIVE PLC Questions And Answers 7 August 10th, 2017 01:02 PM
DIN rail mounted momentary push button? danw LIVE PLC Questions And Answers 18 December 29th, 2013 06:28 PM
Adapter to mount S7-300 on 35mm DIN rail. JesperMP LIVE PLC Questions And Answers 5 December 14th, 2010 07:56 AM
DIN rail mount unmanaged ethernet switch danw LIVE PLC Questions And Answers 21 September 27th, 2007 08:22 PM


All times are GMT -5. The time now is 01:08 PM.


.