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Standoff Screw Question
Standoff Screw Question
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Old 15th May 2019, 03:47 PM   #1
maLx is online now maLx  United States
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Default Standoff Screw Question

Hi, Everyone.

So I'm building my first amplifier into a Hammond box. I want to mount the circuit on the bottom of the box but I don't want anything to stick through the box to the bottom. What should I use do to this? Should I drill a small hole, thread it, and then add a standoff screw to it? If that's the way to do it, what tools do I need?

Or maybe drill a hole in the opposite direction and counter sink a flat screw then add the standoff in backwards and nut it on the board?

Should I use Nylon standoffs or are Brass ones fine?

Never done this before and would like to start messing with it this week.

Thanks!
Joey
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Old 15th May 2019, 03:55 PM   #2
Mark Johnson is offline Mark Johnson  United States
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Here is one feces-rig possibility. Don't ask questions about any two character codenames you might or might not see.

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Old 15th May 2019, 04:09 PM   #3
maLx is online now maLx  United States
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Haha Mark! I love it. Great for a test, but I was looking for a solution that was a bit more finished/commercial appearing
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Old 15th May 2019, 05:39 PM   #4
Andersonix is offline Andersonix  Sweden
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Standoff Screw Question
Which type of Hammond case?

You could glue in a whole “sub floor” with the standoffs (or everything) mounted to it already.
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Old 15th May 2019, 06:09 PM   #5
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Hexagonal brass-made separator with inside screwed with 1/8" or M3 are pretty fine. I have lots of them rescued from destroyed electronic apparatus.
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Old 15th May 2019, 08:28 PM   #6
maLx is online now maLx  United States
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Quote:
Originally Posted by Andersonix View Post
Which type of Hammond case?

You could glue in a whole “sub floor” with the standoffs (or everything) mounted to it already.
This is a good idea. Do you think an ABS Sheet could work as a Sub Floor?
FYBREX Set of 4 Black Square ABS Sheets 12"x12" with .08" Thickness, High Breakage Resistance Great Impact and Tensile Strength, Excellent for Interior Appliance Tub Shower Wall with Mounting Screws: Amazon.com: Industrial & Scientific

I may be able to even mount it to the sides with an L Bracket like this: Amazon.com: Boeray 10pcs 2 Hole Inside Corner Bracket for 2020 Aluminum Extrusion Profile 20x20 with Slot 6mm 10pcs: Gateway

What is the standard screw size for Standoffs? Is it typically M3?
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Old 15th May 2019, 08:35 PM   #7
BigE is offline BigE  Canada
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Don't hammond cases have options for purchase of a back-plane?
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Old 15th May 2019, 08:54 PM   #8
Mark Johnson is offline Mark Johnson  United States
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Mouser part number 855-R30-1000502 is typical of what diyAudio members use:
Hex spacer, female, M3 threads, 5mm tall
I like to add M3 star washers for extra bite and grip.
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Old 15th May 2019, 08:58 PM   #9
maLx is online now maLx  United States
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Quote:
Originally Posted by Mark Johnson View Post
Mouser part number 855-R30-1000502 is typical of what diyAudio members use:
Hex spacer, female, M3 threads, 5mm tall
I like to add M3 star washers for extra bite and grip.
Thanks! So this gets screwed in from both sides I assume? Bottom and top? So if I lay down a sub floor essentially. Star Washer good idea.
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Old 15th May 2019, 09:17 PM   #10
Elvee is offline Elvee  Belgium
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Countersunk screws combined with threaded spacers is what I use when I want a flush bottom.

Use a good conical milling tool on a stationary drill with good lubrication for good and clean results
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