Smoke

Bolt heads sticking out of the chassis, metalwork tips
« on: December 11, 2004, 05:21:20 PM »
I'm just about to start drilling my rack chassis to mount the PCB, the toroids and the mains caps...

the heads of all the screws and bolts (if thats what they are called) would generally stick out, wont that go in the way when placing the unit into a rack case?

what is the best way to mount a pcb to the chassis?



asm

Bolt heads sticking out of the chassis, metalwork tips
« Reply #2 on: December 11, 2004, 05:39:35 PM »
how thick is the material, you could countersink either by a countersink end mill (expensive), or by just using a larger drill and beveling in the hole, then using a machine screw like this:

http://ACE.imageg.net/graphics/product_images/pACEBW-993223reg.jpg
...has a 'gold sputtered capsule for vintage sound'...

CJ

Bolt heads sticking out of the chassis, metalwork tips
« Reply #3 on: December 11, 2004, 06:51:44 PM »
Your typical #6 won't get in the way too much.
Use a rubber mallet to pound the finished product into the rack.
 :razz:
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

Flatpicker

Bolt heads sticking out of the chassis, metalwork tips
« Reply #4 on: December 11, 2004, 06:56:53 PM »
Quote from: "cjenrick"
...Use a rubber mallet to pound the finished product into the rack...
ROTFL!  :green:

soundguy

Bolt heads sticking out of the chassis, metalwork tips
« Reply #5 on: December 11, 2004, 08:11:32 PM »
Quote from: "asm"
by just using a larger drill and beveling in the hole, then using a machine screw


thats what I do and it works well for me with par metal chasis.  the real trick is making the original hole large enough, much larger than the shaft of the screw, so the countersink will allow the screw to sit flush.

dave

chips are good with dip...

Scodiddly

Bolt heads sticking out of the chassis, metalwork tips
« Reply #6 on: December 12, 2004, 01:39:53 AM »
Quote from: "soundguy"
Quote from: "asm"
by just using a larger drill and beveling in the hole, then using a machine screw


thats what I do and it works well for me with par metal chasis.  the real trick is making the original hole large enough, much larger than the shaft of the screw, so the countersink will allow the screw to sit flush.


A proper countersink bit is handy - just a wide, angled tip at the right angle for countersunk heads.  I do it a lot, and while I don't have any problems with the hole being big enough, I have to be careful to go slowly and check periodically.  Otherwise you get a bit too much countersink.

Smoke

Bolt heads sticking out of the chassis, metalwork tips
« Reply #7 on: December 12, 2004, 04:53:38 PM »
sounds all simple, but the rack chassis is pretty thin...
what about the toroid bolt head thats pretty big, how do you mount those toroids

electronaut

Bolt heads sticking out of the chassis, metalwork tips
« Reply #8 on: December 12, 2004, 09:45:20 PM »
Quote from: "soundguy"
thats what I do and it works well for me with par metal chasis.

dave


Which Par-Metal series are you using, Dave?  The 12 and 14 series are designed to allow the additional height of a screw head on the top and bottom, thus eliminating the need to countersink.

soundguy

Bolt heads sticking out of the chassis, metalwork tips
« Reply #9 on: December 12, 2004, 09:48:47 PM »
Ive used both the 12 and 14.  You dont *need* to countersink to fit it in the rack, but it looks neater if you do and if you dont, you are gonna scratch up the top and bottom panels of whatever its racked between if you ever remove it from the rack.  Another valuable lesson learned the hard way...

dave

chips are good with dip...


electronaut

Bolt heads sticking out of the chassis, metalwork tips
« Reply #10 on: December 12, 2004, 09:57:10 PM »
Quote from: "soundguy"
Ive used both the 12 and 14.  You dont *need* to countersink to fit it in the rack, but it looks neater if you do and if you dont, you are gonna scratch up the top and bottom panels of whatever its racked between if you ever remove it from the rack.  Another valuable lesson learned the hard way...

dave


So does that mean you also drill out the standard holes in the top & bottom covers and replace the screws with countersinkable ones?

soundguy

Bolt heads sticking out of the chassis, metalwork tips
« Reply #11 on: December 12, 2004, 10:19:11 PM »
no, I leave those.  with screw heads sticking out you can scratch the front lip of the piece above or below what you are removing if you arent careful, or if you dont even know in the first place that there are screw heads sticking out (like if you have an assistant or someone pull the unit).

dave

chips are good with dip...

Smoke

Bolt heads sticking out of the chassis, metalwork tips
« Reply #12 on: December 13, 2004, 07:37:22 AM »
thats exactly what i thought would happen and im trying to avoid it. its fairly straight forward with the screws,

but once again, what about the toroid transformer bolts?

How do oyu mount toroid transformers? what do you do with that big bolt


 

Related Topics

  Subject / Started by Replies Last post
2 Replies
1220 Views
Last post December 26, 2004, 09:37:22 AM
by Freddy G
14 Replies
2695 Views
Last post March 06, 2008, 06:14:30 AM
by TomWaterman
24 Replies
5669 Views
Last post May 31, 2016, 11:43:51 AM
by TheJames
1 Replies
1873 Views
Last post December 05, 2012, 10:03:05 AM
by sodderboy