Mechanics and Construction > Mechanics and Construction

Purple flake bot! I need suggestions on mounting components please.

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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.

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 which has nice quality cobalt drill bits at reasonable prices, and only a $35 minimum order:
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.

Duane Degn:
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.

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.

Phase one is done.

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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