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View Full Version : How to vacuum clamp yourself to your bot...



harryball
10-18-2007, 10:38 AM
I guess it's been long enough now I can tell the story. A few of you know it already and a couple of you keep telling me I should share.

I have a 4 zone vac table and run 2 feins. For one of my bat house projects I surface one side of a 2x8x48" cedar board before planing the other side. To accomplish this I made a 2'x4' pallet with a cut through smaller than the board, then I added a 1/2" thick soft foam gasket I purchased from Home Depot. When you place the 2x8 on top it sucks down and self levels. It works well... perhaps too well.

So I'm working along one day and I had about 40 boards to plane. I'd place the board, walk to the end of the bot (remember this) and turn on the vac. I'd then check the vac gauge and if it was pulling over 5" of vac I would walk to the other end of the bot and click OK, my program would surface the board in 30 seconds or so, turn off the vac, remove the board and repeat. After doing this about 20 times it gets a little mundane but I have a radio in my headphones so I just enjoy the music.

On one round I turn on the vac and I thought I heard a crack (who can hear with all the noise, headphones and radio?) So I check and the vac and it is about 2" and falling. I go check the board and notice a huge crack down the middle and a large knot that just fell out. The vac force was enough to pull the weak knot out of the board. So I remove it and get the next board.

As I'm placing the next board on the jig... THWUUUMP! it sucks into place with the tips of my fingers under the ends! I forgot to turn off the vacs. I can just make out the vac gauge which is showing about 6", a nice good solid seal. After the searing pain in my fingers began to numb a bit I was able to wiggle and pull my left hand free which only caught about 1/4" of my middle finger. My right hand, however, had all 4 fingers engaged and firmly clamped into place.

So... there I am stuck to the table and unable to turn the vacs off. I give you guys a minute to stop laughing... ... ...

...

OK, that's enough.

I kept wondering how many hours it would be before my wife wandered out to the shop. Then I wondered how long she'd leave me trapped laughing at me.... and how long before the video hit YouTube. After about 5 minutes of prying and pushing and pulling I remembered that I had a small 6" beehive tool (small crowbar, trim nail remover type thingy) in my work apron. I managed to fish it out and apply leverage to the board.

There I am with a woefully undersized pry tool trying to move this board. It took all I was worth to get enough pressure to even wiggle the board. I was afraid the tool was going to break. After another minute of prying and pusing I decided there was just NO WAY I was going to let my wife find me this way! I imaginged the embarrassment and the ensuing video release. This was enough to bring on a rush of adrenalin and with shear determination I was able to finally free myself from the bot.

My fingers are fine but they did throb for a while once feeling returned.

Well... now you know. I'm not sure what I can do for an encore but stay tuned.

Robert

GlenP
10-18-2007, 11:30 AM
Well Robert I am getting a visual of you standing there stuck to the machine. Thanks Robert, I just came in from the shop for a frustration break and now you cheered me back up. Would certainly love to see that video.

bcammack
10-18-2007, 11:39 AM
Sounds like a compelling argument for a light-curtain at that end of the 'bot, controlling the vacuums...

geneb
10-18-2007, 12:06 PM
...a cheaper solution would be to carry a thin prybar in his apron at all times.


g.

myxpykalix
10-18-2007, 12:17 PM
That story REALLY SUCKS!!! lol

mgcain
10-18-2007, 01:50 PM
Oh my God that is so funny...The visuals...the visuals...

mmccue29
10-18-2007, 05:41 PM
That is way too funny. Thanks for sharing.

wberminio
10-18-2007, 05:48 PM
I can see I have alot to look forward to!
Pry bars should be standard equipment.

terryd
10-18-2007, 08:36 PM
Well Batman, you've done it now ! I think the Dr. Pepper than just blew through my nose should stop stinging soon.....Great timing I really needed the laugh...THX

Terry

beacon14
10-18-2007, 11:11 PM
We've been preaching that you can hold down virtually anything with a couple of Fein vacs and a good table - you really didn't have to go to such extremes to prove it!

ed_lang
10-19-2007, 08:40 AM
Holy pinched fingers Batman! This looks like the work of the Joker!

Something tells me that I need to have not only my cyclone but the Feins on an X10 module and the remote in my pocket all the time!

I have gotten a blood blister from catching the ends of my finger before but never got a wing caught! Vacuum is quite powerful and in this case, quite funny! Thanks for the laugh and very glad you didn't suffer any lasting damage except for the ribbing you will get at the next Jamboree!

scottcox
10-19-2007, 09:53 AM
Aren't you glad it wasn't on a timed pause?

Tick, tock, tick, tock..... Uh-oh, here comes the gantry!

mgcain
10-19-2007, 09:58 AM
I'm guessing you'll think twice before you even bend down to examine a cut up close!

scott_smith
10-19-2007, 02:04 PM
Embarrassing moment #2. I’ve been “stuck” to the Bot also. My story goes like this:
It’s the very end of a long file. The part starts to lift from the table. (This is the dumb part.) So I reach in to hold it down to keep a consistent Z depth. That’s when the V-roller on the Y carriage rolls over my shirtsleeve (motor side) and the program ends. Hmm, they say I shouldn’t push the gantry while hooked up to the controller on a PRT, Stuck!

harryball
10-19-2007, 06:07 PM
I'm glad I could provide some comic relief.

On a serious note, these things can be dangerous. While my situation was somewhat comical, it does illustrates how easily and unexpectedly you can get in a potentially dangerous situation. Imagine if I'd been working 2 blanks with the bot running continuously... not a good idea. I've never done anything like that and never will. The bot can only start moving when I am at the PC and command it to do so. I never work on or at the table during a run file, I stop the unit.

I know many of us take chances, placing/removing holddown screws while a file is running, trying to hold down a peice that's breaking free etc... It's just not a good idea so be careful.

Robert

curtiss
10-20-2007, 01:03 PM
With the proper music, the proper cut file and an extended z axis, this event could be written into a James Bond movie... be careful out there

cj