2015 POTD Thread Archive

Industrial grade helmets react at speeds of 1/10,000 to 1/20,000 of a second and have adjustable shades settings of #9 to #13 for welding. Industrial grade helmets also have adjustable sensitivity (useful for low amperage welding) and delay controls to adjust how long the lens stays dark after the arc stops.

Newer helmets have different modes, allowing the same helmet to be used for welding, cutting and grinding. The most recent development is a mode that senses the arc electromagnetically, offering full protection when the sensors are obstructed, as when pipe welding or welding out-of-position.

Avoid auto-darkening helmets that darken with a reaction time of 1/2,000 to 1/3,600 of a second. This is not adequate for industrial applications. Further, cold weather delays the reaction time on all auto-darkening helmets. Higher-end helmets are rated for use down to 14 degree F. However, low-end helmets with slower reaction times may not darken quickly enough in cold weather

verbatim from Miller, auto darks aren't perfect, they are great but they still aren't used in field pipe welding here in alaska, I work oil field and have NEVER seen a pipe weldor in the field or in the weld shop use an auto dark and it's because of the statements above. I said before they are great for in position where there aren't obstructions, and I know my 3M doesn't magnetically sense the arc as I've been flashed many a times when out of position when the sensors are obstructed, enough times I've wanted to throw the helmet across the room
 
I tried the HF auto dark helmet. I have cataracts and when I used it i walked away seeing stars and halos. I purchased a Lincoln Viking 3350 welding helmet and had no more problems. Doc says medicare will only pay for surgery after I can no longer see well enough to drive during the day. Moral of the story is be very careful with low cost auto dark helmets.
 
That sure beats making a wheel with that profile and putting in a myriad notches.

Having seen the Video. I'm really impressed by all the details you've taken care of. Really good work.
 
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Boy, do you have the patience of Job.... I'd a' tried to make a round cutter.
 
The wheel will be used on a clock, eventually...there are dozens of parts to be made...

My mill is a standard X2 from HF. The gear was cut on a homemade CNC Router with a modified Indian made 3" rotary table as the 4th axis. I have shot a video of the cutting; tomorrow I will edit and post it.

Wagner
 
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