Undersize Rod for Die Stock Threading


After my experience threading 1/4 inch aluminum rod to M6x1.0, I am
sure 5/16 rod is just enough undersize for an M8x1.0, M8x1.25, or even
M8x1.50 die stock to thread in a really sweet way. I'm trying it
tomorrow.
Cheers,
Douglas (Dana) Goncz
Experimental Machinist
Replikon Research
Seven Corners, VA 22044-0394
Reply to
The Dougster
Loading thread data ...
Correct, although I question the use of 1/4" material for 6MM threads. It's woefully oversized.
Harold
Reply to
Harold & Susan Vordos
Harold sez:
"Correct, although I question the use of 1/4" material for 6MM threads. It's woefully oversized."
Harold,
Why'nt you just tell him the quick and dirty way to size taps drills for metric is: Drill diameter = Metric size - pitch in mm.
Bob Swinney
Reply to
Robert Swinney
Oooppps ! To size rods for external metric threading: Nominal Diameter - (pitch X .866)
Bob Swinney
Reply to
Robert Swinney
Oooopps! Wrong again - just wanted to see if you were awake. The rod size for metric threading is: Nominal diameter - (.125 X Cos 30 degrees) X pitch in mm.
Bob (shamefully bowing head) Swinney
Reply to
Robert Swinney
Chuckle!
H
Reply to
Harold & Susan Vordos
message
Of course you question it. I didn't make it clear. I didn't mention I filed the 1/4 inch rod to 0.234 inches minus a few mils. It threaded OK then, but I was looked for a rod that could be threaded with nearly no preparation.
The point I was trying to make was that M6 is *smaller* than 1/4 inch so turing or filing is mandatory. M8 is *bigger* than 5/16, so I tried it and the threads were beautiful. Most of them were sharp-V on the eyball inspector gage. :)
Let's see, the next size up is 3/8 inch, and M10 is 0.390. It's bigger than the inch size. Might work.
So, 1/4 inch rod is too big to thread M6. 5/16 in aluminum rod threds to M8 OK. and 3/8 inch rod might thread M10.
That summary is what I wanted to establish. Now to stock up on 5/16 inch aluminum rod through Amazon while my Prime subscription is still active. Small parts, $2.56 per 6 foot length, no shipping because of the Prime trial. Whee!
1/4 and 3/8 I buy at Hoooooome Depot, nearby, the hottest pick-up spot in No. Va. Every Friday and Saturday evening you'll see couple in the hardware aisle having conversations like, "I just met you but I need a good screw." :) *I'm not kidding, they are everywhere!*
Doug
Reply to
The Dougster
See what your local welding supplier stocks or will order for TIG rod. The largest I've found is 1/4" but they had a good variety of smaller sizes like 3/16" and 5/32" which can be threaded #10 and #8, or 5mm and 4mm.
jsw
Reply to
Jim Wilkins

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.