Harig 612 Spindle Sound

CarbideBob · Nov 10, 2022

Dangerous?
Broken wheels normally are contained by the wheel guard although this light weight machine will jump up and down on it's base when it happens.
Dad was running one with no wheel guard. Wheel blew up and he had his arm up on the downfeed. Fractured his arm.
Thrown parts usually go left of you.
Every bad and recordable that I have had come from getting your fingers too close to a running wheel.
Most often it is wiping off the chuck with the wheel running..... Bad idea
Bites the back of your hand/finger and you go "Hey, I can see the things inside my hand as I move it".
Normally a clean slice even if down to bone and not much blood or pain. This just before you go into shock and some do pass out.
When you go to the ER and they take a scrub-brush to clean it... that hurts.

All machine tools are dangerous. Manual ones much more than enclosed cncs.
Grandpa did not have a ring finger. A gear cutting machine took it in a auto plant. A friend lost his entire hand to a transfer bar in the same complex and I have seen worse.
All of these things cut metal and simply do not care about human flesh.
Anyone with machines should have a decent first aid kit nearby.
Bob

michiganbuck · Nov 10, 2022

Coming to touch the part and having a high unexpected place can be dangerous, So I like to wheel/feel the part with a parked wheel on a chancy set-up and be careful on all others..with a down feed and travel to the grind-side,, not the climb-side of the part. The grind sid s on most grinders the table long traveling to the right..and then touching the part.
Block-in to a tall part with the block-in touching that part high up, a low block-in is just a tip-over block. If the block-in misses touching the part then a shim might be added high up on the part.

Conrad Hoffman · Nov 10, 2022

For every setup, make a conscious effort to think about every possible thing that can go wrong. Then figure out how you're going to make the possible impossible. Never put flesh between a rock and a hard place. I raise the wheel and still wipe half the chuck with the table right, then left, so I never get too close to the wheel and never underneath it.

wesg · Nov 10, 2022

CarbideBob said:
One should also be careful when side wheeling with back of the wheel on this machine not to overcome this preload.

Bob

I did not know this. Thinking back, never noticed a problem spin grinding punches to a shoulder, they'd spark out. Side wheeling shoulders on blocks, no matter how many passes I'd make with the table it would keep cutting (rubbing, really). I figured probably the work getting hot and expanding, but letting it cool never made any difference.

Image in my head is 'seeing' the face in question, so the back of the wheel.

Thank you. I'll keep this in mind, and check what type of bearings are in a particular grinder I might be purchasing.

eKretz · Nov 10, 2022

On a grinder, if your brain is telling you "I can squeeze in/through there" while the wheel is running; don't. These guys are dead on. Move the table or wheel out of the way first or stop the wheel. Getting munched by a grinder is not the same as getting a slice from a knife or cutter. Those are severs, and everything is generally still there to grow back together. A grinder will remove anything it encounters and grind it into itty bits in the process. That takes a long time for your body to fill back in.

rgsheehan · Nov 10, 2022

Yea! My shop made spanner wrench worked. The nut was not really that tight, and the adapter came right off without even using the puller. Spindle taper looks perfect.
Now on to repairing that longitudinal table issue. As long as I'm messing with it, I think I might as well contact JDS tech support (or somebody) and check what might be involved in switching over from rack/pinion to a cable drive.

wesg · Nov 11, 2022

My cousin ran his hand under a wheel. He said it left a 1/4" wide 'notch' (not horribly deep), and he looked at it and thought 'that's kinda cool, and it doesn't hurt at all' ... until the blood started seeping in ...

eKretz · Nov 11, 2022

wesg said:
My cousin ran his hand under a wheel. He said it left a 1/4" wide 'notch' (not horribly deep), and he looked at it and thought 'that's kinda cool, and it doesn't hurt at all' ... until the blood started seeping in ...

Yeah that's the other thing. If you get a deep one it is a royal bear to stop the bleeding. I notched myself once pretty good, I think I held my damn hand over my head for a half an hour after I scrubbed it, trying to get it to stop bleeding.

michiganbuck · Nov 12, 2022

The old hack method to stop bleeding is to wrap the wound in brown paper that cone from a food-grade paper bag, Use the never touched inside of the bag against the wound so as not to have any bacteria /grubs on it. The glue in the brown paper bag is an OK blood dryer.
Out in the bush good to use fire ashes and water to wash rags and hang them in the sun to dry, boiling the rags after washing can be an added good precaution.
Keeping wounds dry and covered with a breathable wrap for 3 days can be good.

rgsheehan · Nov 12, 2022

Holy crap, maybe I picked the wrong hobby.

At this age, healing is not something I do very well or quickly. Just have to double down on the safety stuff, I reckon.

eKretz · Nov 12, 2022

It's not a common thing, just keep your hands away from the wheel. Those of us who learned the hard way just try to pass on the lesson. And there's a powder that is excellent for stopping bleeding, called styptic powder. There are a few brand names of the same stuff. Also super glue can work in a pinch. What I wouldn't bother with is that Liquid Skin stuff. Never worked well for me. Either way, step 1 is scrub the shit out of the wound first. With soap. Being a pussy at step 1 is how you get a nasty infection.

michiganbuck · Nov 12, 2022

Guess w need to discuss wht whel

Milland · Nov 12, 2022

I will second keeping your F'ing hand away from the wheel. Treat it like a weapon, always presume it's loaded (running). It "seductive" because it looks so different than a edged cutter, but it'll carve you up without a second's thought.

CarbideBob · Nov 12, 2022

rgsheehan said:
Holy crap, maybe I picked the wrong hobby. At this age, healing is not something I do very well or quickly. Just have to double down on the safety stuff, I reckon.

Hard to say what is a good hobby.
Trimming a stupid old apple tree has been harder on me than a long time with machine tools and racing toys.

zeo · Nov 21, 2022

Vitamin K will stop the bleeding pretty quick. You can get it at most drug stores. Good to keep around if you are accident prone or are using blood thinners.

AD Design · Nov 21, 2022

Letting a wound bleed for a bit can/will help flush out whatever contaminants are embedded from whatever passed through your flesh. Trapped contaminants, especially from grinding, seem to produce nastier infections than a clean slice. After bleed a bit I'll use toilet paper to help create a clot if nothing else is available, same as a shaving cut.

To the OP- Grinders are some of the most dangerous machines in the shop. When something bad happens it's instantaneous and there's no time to move or even react. Wheels can literally explode, sending chunks of stone at terrific speed into/through anything within 20 feet or more. Do please review your safety habits around them.

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Harig 612 Spindle Sound

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