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Purple flake bot! I need suggestions on mounting components please.
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Topic: Purple flake bot! I need suggestions on mounting components please. (Read 2721 times)
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ROBOT420
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The Geeks shall inherit the earth!!
Purple flake bot! I need suggestions on mounting components please.
«
on:
April 23, 2013, 10:40:57 AM »
http://s1362.photobucket.com/user/420photo420/media/20130327_190829_zps55588f8b.mp4.html?sort=3&o=1
http://s1362.photobucket.com/user/420photo420/media/20130405_140416_zps02c15b01.mp4.html?sort=3&o=3
So I am have started final assembly and the self tapping screws that I was gona use are not cutting it on this metal as it used to be a wheelchair and is quite strong. I have lots of power supplies, relays, LEDs, ect to mout on there, and hot glue seems pretty cheap-ish. Any advice? Thanks!
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jwatte
Supreme Robot
Posts: 1,345
Helpful? 82
Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #1 on:
April 23, 2013, 11:56:52 AM »
Self tapping screws only work on plastic and aluminum, and perhaps very thin sheet metal in mild steel.
To do mounting using bolts in thick steel or alloy/stainless steel, I would drill holes and tap them, or I would drill through holes (clearance holes) and use a nut and lock washer on the other end.
Btw: Very sparkly purple color you got there. Good job!
«
Last Edit: April 23, 2013, 11:58:39 AM by jwatte
»
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jkerns
Robot Overlord
Posts: 270
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Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #2 on:
April 23, 2013, 11:58:04 AM »
Drill and tap the holes and use machine screws.
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http://www.ltu.edu/engineering/mechanical/bachelor-science-robotics-engineering.asp
ROBOT420
Full Member
Posts: 66
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The Geeks shall inherit the earth!!
Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #3 on:
April 23, 2013, 12:08:08 PM »
Thanks for the reply! I have never had much luck with metal bits (at all). What is a good brand of drill bit that I can get from Lowes or Advanced auto? Also do I run it in Forward for penetration, or in reverse to remove metal shavings from the hole?
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jkerns
Robot Overlord
Posts: 270
Helpful? 12
Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #4 on:
April 23, 2013, 12:19:22 PM »
Any would work. I suspect that Advanced Auto will have the tap you need. If you can't find number drills you can usually get away with the closest fractional drill. For example, for a 10/24 thread you want a number 25 drill, but 5/32" will be close enough.
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I get paid to play with robots - can't beat that with a stick.
http://www.ltu.edu/engineering/mechanical/bachelor-science-robotics-engineering.asp
ROBOT420
Full Member
Posts: 66
Helpful? 0
The Geeks shall inherit the earth!!
Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #5 on:
April 23, 2013, 06:53:18 PM »
Got em, and some rubber washers too. More pics to follow, trying to get my duel car horns with chrome grills mounted and working right now.
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jwatte
Supreme Robot
Posts: 1,345
Helpful? 82
Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #6 on:
April 23, 2013, 08:01:01 PM »
For metal drilling, I prefer M42 cobalt drills. They can cut into stainless even, and dull a lot slower than regular high speed steel bits (coated or not.)
In general, you can drill up to 2 times the diameter of the drill before you need to retract to clear chips/swarf, and then keep drilling. You'll want a drill press or mill for good results; hand drilling in steel has never worked out for me.
I get my drill bits from drillbitwarehouse.com which has nice quality cobalt drill bits at reasonable prices, and only a $35 minimum order:
http://drillbitwarehouse.com/home?page=shop.browse&category_id=6
For tapping, you have to cut a small amount (half a turn to a turn) and then back up to clear chips; repeat. You also have to have a very steady hand (or drill press that you crank manually) and use some kind of cutting fluid. Safe-Tap, WD-40, and 5/20 motor oil all work alright; WD-40 is a little light, and the motor oil is a little heavy.
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Duane Degn
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Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #7 on:
April 24, 2013, 05:44:43 AM »
I second the drill press advice. Harbor Freight sells some cheap presses. I'm sure a more expensive press would be better and a cheap one but a cheap one sure beats not having one at all.
When cutting threads into hard metal (steel), it's recommended to start the cut with a tapper tap. This has a less aggressive cutting surface to make it easier to begin the threads. This is then followed with a plug (or second) tap. A bottoming tap is then used to cut the final threads if your cutting threads into a blind hole.
Here's a set of three taps I found at Amazon.
http://www.amazon.com/Irwin-Tools-2738--Piece-Set/dp/B003K15ERU/ref=sr_1_7?ie=UTF8&qid=1366802730&sr=8-7&keywords=three+piece+tap+set
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jwatte
Supreme Robot
Posts: 1,345
Helpful? 82
Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #8 on:
April 24, 2013, 12:26:02 PM »
If you hand tap, you absolutely need to start with the taper tap!
If you use a drill press for holding/alignment, and turn it by hand, you can get away with starting straight on the plug tap, as you will have a perfectly straight start. This is also useful for cutting threads on the outside of round stock, I've recently learned.
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ROBOT420
Full Member
Posts: 66
Helpful? 0
The Geeks shall inherit the earth!!
Re: Purple flake bot! I need suggestions on mounting components please.
«
Reply #9 on:
April 30, 2013, 11:41:23 AM »
Phase one is done.
http://s1362.photobucket.com/user/420photo420/media/20130429_123146_zpsae19c0c5.mp4.html
The relays and such are now screwed to the steel with 2 washers and 1 rubber washer on each screw as spacers and shock absorbsion. Next, to wire 'em up and add more goodies.
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Purple flake bot! I need suggestions on mounting components please.
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